gpt55-token-gateway

gpt55-token-gateway is the self-chosen service name of an unnamed operator running two OpenAI-compatible AI API gateways on the 558686.xyz domain. GPT55 Model Gateway (gpt55.558686.xyz) sells single GPT-5.6 Luna, GPT-5.5 and GPT-5.3-codex chat completions, deterministic text and wallet tools, and prepaid call packs per request over the x402 payment protocol (HTTP 402 quote, exact USDC on Base eip155:8453, payTo 0x1f01...9a2f) with no account and no API key, and publishes an OpenAPI 3.1 contract (37 operations), a remote MCP server at /mcp that answers initialize and tools/list anonymously with 218 tools, an A2A 1.0 agent card, an MCP registry server.json, an ai-plugin.json, an x402 discovery document, pricing and live-price JSON, a Postman collection, llms.txt and a Content-Signal robots.txt. A second, free, unauthenticated REST surface of 44 developer utilities is served under /api-market for API.market import. Sub2API (sub2api.558686.xyz, also api.558686.xyz) is a self-hosted deployment of the open-source Wei-Shaw/sub2api relay that resells GPT, Claude and Gemini models by Bearer API key at a 1 USD paid = 10 USD platform-quota ratio, with a 3-operation OpenAPI, an APIs.json index, Chinese-language docs and public registration currently closed. Four retired split hosts (x402-utils, x402-wallet, x402-seller, x402-key.558686.xyz) answer HTTP 410 with retirement notices pointing back to GPT55. Source repository github.com/wangletiand/gpt55-x402-gateway (MIT); the security contact ops@400860.xyz and the Sub2API recharge shop shop.400860.xyz tie the operator to the sibling 400860.xyz record.

gpt55-token-gateway publishes 13 API contracts indexed on the APIs.io network, including Base Usdc API, Gpt55 Model Gateway API, Gpt55 Retained High Intent API, and 10 more. Tagged areas include x402, Agentic Payments, MCP, A2A, and AI Gateway.

gpt55-token-gateway’s developer surface includes engineering blog, documentation, getting-started guide, API reference, pricing, GitHub presence, authentication, and 33 more developer resources.

🌐 Visit website 📡 Source on GitHub

57.6/100 strong ▬ flat Agent 44/100 agent ready saas Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

3 published contracts 1 MCP Servers

x402 Agentic Payments MCP A2A AI Gateway OpenAI-Compatible LLM AI Agents USDC BaseAPI RelayDeveloper Tools

Kin Score

Kin Score How this is scored →
scored 2026-10-09 · rubric v0.23.0

Composite quality — 57.6/100 · strong

Contract Quality 9.1 / 19

Developer Ergonomics 11.0 / 15

Access Clarity 9.9 / 15

Operational Transparency 5.9 / 10

Contract Governance 1.6 / 9

Discoverability 6.0 / 8

Regulatory Posture 3.4 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 44/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 3 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/558686-xyz: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

x402

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 13

Individual APIs this provider publishes, each with its own machine-readable definition.

GPT55 x402 Gateway MCP Server

Remote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a GET returns the server.json-shaped manifest and /mcp/sse streams the discovery config). ...

GPT55 Model Gateway A2A Agent

Agent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and identically at the legacy /.well-known/agent.json) - name "GPT55 Model Gat...

gpt55-token-gateway Base Usdc API

The base-usdc API from gpt55-token-gateway — 1 operation(s) for base-usdc.

gpt55-token-gateway Gpt55 Model Gateway API

The gpt55-model-gateway API from gpt55-token-gateway — 27 operation(s) for gpt55-model-gateway.

gpt55-token-gateway Gpt55 Retained High Intent API

The gpt55-retained-high-intent API from gpt55-token-gateway — 1 operation(s) for gpt55-retained-high-intent.

gpt55-token-gateway Gpt55 Retained Nonmodel API

The gpt55-retained-nonmodel API from gpt55-token-gateway — 6 operation(s) for gpt55-retained-nonmodel.

gpt55-token-gateway Models API

The Models API from gpt55-token-gateway — 1 operation(s) for models.

gpt55-token-gateway Responses API

The Responses API from gpt55-token-gateway — 1 operation(s) for responses.

gpt55-token-gateway Utility Tools API

Deterministic text, JSON, encoding, hashing, URL parsing, and developer utilities.

gpt55-token-gateway Wallet Security API

The wallet-security API from gpt55-token-gateway — 1 operation(s) for wallet-security.

gpt55-token-gateway Wallet Signing Safety Pack API

The wallet-signing-safety-pack API from gpt55-token-gateway — 1 operation(s) for wallet-signing-safety-pack.

gpt55-token-gateway X402 API

The x402 API from gpt55-token-gateway — 1 operation(s) for x402.

gpt55-token-gateway Chat Completions API

The Chat Completions API from gpt55-token-gateway — 1 operation(s) for chat completions.

Scroll for all 13

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

gpt55-token-gateway MCP Server

GPT55 ships a hosted, remote, Streamable HTTP MCP server at https://gpt55.558686.xyz/mcp that answers initialize (protocolVersion 2025-06-18), tools/list (218 tools with JSON Sc...

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

558686 Xyz Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

558686 Xyz Rate Limits

1 limits

RATE LIMITS

OpenAPI Overlays 3

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

558686 Xyz Api Market Utility Tools Overlay

2 actions · update · 558686-xyz-api-market-utility-tools-openapi.json

GENERATED

558686 Xyz Gpt55 Model Gateway Overlay

6 actions · documentation · 558686-xyz-gpt55-model-gateway-openapi.json

GENERATED

558686 Xyz Sub2Api Overlay

3 actions · documentation · 558686-xyz-sub2api-openapi.json

GENERATED

Examples 2

Example request and response payloads for these APIs.

558686 Xyz Standard Chat Example

10 fields

EXAMPLE

558686 Xyz Translate Canary Example

10 fields

EXAMPLE

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

558686 Xyz Authentication

x402-payment/http-bearer/api-key-header · 4 schemes

SECURITY

558686 Xyz Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

558686 Xyz Vulnerability Disclosure

disclosure policy published

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Sandbox

Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

MCPServer

LLMsTxt

WellKnown

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Lifecycle

Conventions

ErrorCatalog

Conformance

Build 9

SDKs, sample code, and the tooling you integrate with

GitHubRepository

SourceCode

GitHub

ToolCrosswalk

AIPlugin

Postman

Packages

SDKs

Examples

Scroll for all 9

Access & Security 4

Authentication, authorization, and security posture

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

Deprecation

Deprecation

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

PrivacyPolicy

PrivacyPolicy

Plans

Plans

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 6

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

APIsJson

ContentSignal

Overlay

Source (apis.yml)

aid: 558686-xyz
name: gpt55-token-gateway
description: gpt55-token-gateway is the self-chosen service name of an unnamed operator running two OpenAI-compatible AI API
  gateways on the 558686.xyz domain. GPT55 Model Gateway (gpt55.558686.xyz) sells single GPT-5.6 Luna, GPT-5.5 and GPT-5.3-codex
  chat completions, deterministic text and wallet tools, and prepaid call packs per request over the x402 payment protocol
  (HTTP 402 quote, exact USDC on Base eip155:8453, payTo 0x1f01...9a2f) with no account and no API key, and publishes an OpenAPI
  3.1 contract (37 operations), a remote MCP server at /mcp that answers initialize and tools/list anonymously with 218 tools,
  an A2A 1.0 agent card, an MCP registry server.json, an ai-plugin.json, an x402 discovery document, pricing and live-price
  JSON, a Postman collection, llms.txt and a Content-Signal robots.txt. A second, free, unauthenticated REST surface of 44
  developer utilities is served under /api-market for API.market import. Sub2API (sub2api.558686.xyz, also api.558686.xyz)
  is a self-hosted deployment of the open-source Wei-Shaw/sub2api relay that resells GPT, Claude and Gemini models by Bearer
  API key at a 1 USD paid = 10 USD platform-quota ratio, with a 3-operation OpenAPI, an APIs.json index, Chinese-language
  docs and public registration currently closed. Four retired split hosts (x402-utils, x402-wallet, x402-seller, x402-key.558686.xyz)
  answer HTTP 410 with retirement notices pointing back to GPT55. Source repository github.com/wangletiand/gpt55-x402-gateway
  (MIT); the security contact ops@400860.xyz and the Sub2API recharge shop shop.400860.xyz tie the operator to the sibling
  400860.xyz record.
url: https://raw.githubusercontent.com/api-evangelist/558686-xyz/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  license_evidence:
    not_product:
    - wangletiand/gpt55-x402-gateway
  open_source: unknown
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: low
  source:
  - openapi
  - pricing
  - repository-not-product
  generated: '2026-09-25'
  method: derived
image: https://gpt55.558686.xyz/favicon.ico
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-09-19 (local-v3; was a2a-registry harvest stub)
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-10-06'
tags:
- x402
- Agentic Payments
- MCP
- A2A
- AI Gateway
- OpenAI-Compatible
- LLM
- AI Agents
- USDC
- Base
- API Relay
- Developer Tools
tags_raw:
- x402
- Agent Payments
- MCP
- A2A
- AI Gateway
- OpenAI-compatible
- LLM
- AI Agents
- USDC
- Base
- API Relay
- Developer Tools
apis:
- aid: 558686-xyz:gpt55-mcp-server
  name: GPT55 x402 Gateway MCP Server
  description: 'Remote Model Context Protocol server at https://gpt55.558686.xyz/mcp (Streamable HTTP; a GET returns the server.json-shaped
    manifest and /mcp/sse streams the discovery config). Probed anonymously on 2026-09-20: initialize answered protocolVersion
    2025-06-18, serverInfo {gpt55-x402-gateway, "GPT-5.5 x402 Agent Payment Control Plane", 2026.06.21}, capabilities tools
    + resources; tools/list returned 218 tools, each with a JSON Schema inputSchema and MCP annotations; resources/list returned
    14 JSON resources (x402 discovery, live prices, pricing, buyer guide, agent card, openapi). The server''s own instructions
    state that it is a facade: a tool call returns the direct HTTP endpoint, the x402 payment requirements and an example
    payload, and the caller must execute that HTTP endpoint with x402 Base USDC payment or a private Bearer key - "this MCP
    facade does not bypass payment". Registered-shape server.json at /server.json and /.well-known/mcp.json (name gpt55-model-gateway,
    version 2026.07.01-split) and a SEP-1649 server card at /.well-known/mcp/server-card.json (xyz.558686.gpt55/token-gateway);
    no entry was found in the official MCP registry and the install guide says no marketplace submission has been made.'
  humanURL: https://gpt55.558686.xyz/projects/558686/install
  baseURL: https://gpt55.558686.xyz/mcp
  tags:
  - MCP
  - x402
  - AI Agents
  properties:
  - type: MCPServer
    url: mcp/558686-xyz-mcp.yml
  - type: MCPServer
    name: GPT55 remote MCP endpoint (Streamable HTTP)
    url: https://gpt55.558686.xyz/mcp
  - type: ToolCrosswalk
    url: mcp/558686-xyz-tool-crosswalk.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/llms-install.md
- aid: 558686-xyz:gpt55-a2a-agent
  name: GPT55 Model Gateway A2A Agent
  description: 'Agent2Agent surface: an agent card served at https://gpt55.558686.xyz/.well-known/agent-card.json (and identically
    at the legacy /.well-known/agent.json) - name "GPT55 Model Gateway", version 1.0.0, protocolVersion "1.0", preferredTransport
    JSONRPC, url https://gpt55.558686.xyz/a2a, provider {gpt55-token-gateway, https://gpt55.558686.xyz}, capabilities {streaming
    false, tools true, paid true}, five skills (chat completions, translate, x402 buyer shortlist, wallet signing safety pack,
    x402 MCP integration kit), each priced in USDC, authentication [{schemes: [x402]}]. POST https://gpt55.558686.xyz/a2a
    answers JSON-RPC 2.0 (-32601 for an unknown method); message/send was not exercised because every skill is paid. Listed
    on a2aregistry.org under author gpt55-token-gateway, which is where this record was harvested from.'
  humanURL: https://gpt55.558686.xyz/llms.txt
  baseURL: https://gpt55.558686.xyz/a2a
  tags:
  - A2A
  - x402
  - AI Agents
  properties:
  - type: AgentCard
    url: a2a/558686-xyz-a2a.yml
  - type: AgentCard
    name: A2A Agent Card (provider-hosted)
    url: https://gpt55.558686.xyz/.well-known/agent-card.json
- aid: 558686-xyz:558686-xyz-base-usdc-api
  name: gpt55-token-gateway Base Usdc API
  description: The base-usdc API from gpt55-token-gateway — 1 operation(s) for base-usdc.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - base-usdc
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-base-usdc-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-gpt55-model-gateway-api
  name: gpt55-token-gateway Gpt55 Model Gateway API
  description: The gpt55-model-gateway API from gpt55-token-gateway — 27 operation(s) for gpt55-model-gateway.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - gpt55-model-gateway
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-gpt55-model-gateway-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-gpt55-retained-high-intent-api
  name: gpt55-token-gateway Gpt55 Retained High Intent API
  description: The gpt55-retained-high-intent API from gpt55-token-gateway — 1 operation(s) for gpt55-retained-high-intent.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - gpt55-retained-high-intent
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-gpt55-retained-high-intent-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-gpt55-retained-nonmodel-api
  name: gpt55-token-gateway Gpt55 Retained Nonmodel API
  description: The gpt55-retained-nonmodel API from gpt55-token-gateway — 6 operation(s) for gpt55-retained-nonmodel.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - gpt55-retained-nonmodel
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-gpt55-retained-nonmodel-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-models-api
  name: gpt55-token-gateway Models API
  description: The Models API from gpt55-token-gateway — 1 operation(s) for models.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - Models
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-models-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-responses-api
  name: gpt55-token-gateway Responses API
  description: The Responses API from gpt55-token-gateway — 1 operation(s) for responses.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - Responses
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-responses-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-utility-tools-api
  name: gpt55-token-gateway Utility Tools API
  description: Deterministic text, JSON, encoding, hashing, URL parsing, and developer utilities.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - utility-tools
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-utility-tools-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-wallet-security-api
  name: gpt55-token-gateway Wallet Security API
  description: The wallet-security API from gpt55-token-gateway — 1 operation(s) for wallet-security.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - Wallet Security
  tags_raw:
  - wallet-security
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-wallet-security-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-wallet-signing-safety-pack-api
  name: gpt55-token-gateway Wallet Signing Safety Pack API
  description: The wallet-signing-safety-pack API from gpt55-token-gateway — 1 operation(s) for wallet-signing-safety-pack.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - wallet-signing-safety-pack
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-wallet-signing-safety-pack-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-x402-api
  name: gpt55-token-gateway X402 API
  description: The x402 API from gpt55-token-gateway — 1 operation(s) for x402.
  humanURL: https://gpt55.558686.xyz/x402/service
  baseURL: https://gpt55.558686.xyz
  tags:
  - x402
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-x402-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
- aid: 558686-xyz:558686-xyz-chat-completions-api
  name: gpt55-token-gateway Chat Completions API
  description: The Chat Completions API from gpt55-token-gateway — 1 operation(s) for chat completions.
  humanURL: https://gpt55.558686.xyz/projects/558686/install
  baseURL: https://gpt55.558686.xyz/mcp
  tags:
  - Chat Completions
  properties:
  - type: OpenAPI
    url: openapi/558686-xyz-chat-completions-api-openapi.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: APIReference
    url: https://gpt55.558686.xyz/buyer-guide
  - type: GettingStarted
    url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
  - type: Pricing
    url: https://gpt55.558686.xyz/pricing.json
  - type: Postman
    url: https://gpt55.558686.xyz/postman/collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-gpt55-postman-collection.json
  - type: X402
    url: https://gpt55.558686.xyz/.well-known/x402
  - type: Examples
    url: examples/558686-xyz-standard-chat-example.json
  - type: Examples
    url: examples/558686-xyz-translate-canary-example.json
  - type: RateLimits
    url: rate-limits/558686-xyz-rate-limits.yml
  - type: ErrorCatalog
    url: errors/558686-xyz-problem-types.yml
  - type: Conventions
    url: conventions/558686-xyz-conventions.yml
  - type: Documentation
    url: https://gpt55.558686.xyz/api-market
  - type: Documentation
    url: https://sub2api.558686.xyz/docs/
  - type: GettingStarted
    url: https://sub2api.558686.xyz/docs/getting-started.html
  - type: Pricing
    url: https://sub2api.558686.xyz/pricing
  - type: Login
    url: https://sub2api.558686.xyz/login
  - type: APIsJson
    url: https://sub2api.558686.xyz/apis.json
  - type: LLMsTxt
    url: llms/558686-xyz-sub2api-llms.txt
  - type: Postman
    url: https://sub2api.558686.xyz/postman/sub2api.postman_collection.json
  - type: PostmanCollection
    url: postman/558686-xyz-sub2api-postman-collection.json
  - type: Authentication
    url: authentication/558686-xyz-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://sub2api.558686.xyz/blog/
  type: Blog
- type: Overlay
  url: overlays/558686-xyz-api-market-utility-tools-overlay.yaml
- type: Overlay
  url: overlays/558686-xyz-sub2api-overlay.yaml
- type: Website
  url: https://558686.xyz/
- type: DeveloperPortal
  url: https://gpt55.558686.xyz/x402/service
- type: Documentation
  url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
- type: GettingStarted
  url: https://gpt55.558686.xyz/x402/guides/ai-agent-x402-api
- type: APIReference
  url: https://gpt55.558686.xyz/buyer-guide
- type: Pricing
  url: https://gpt55.558686.xyz/pricing.json
- type: PrivacyPolicy
  url: https://gpt55.558686.xyz/privacy
- type: GitHubRepository
  url: https://github.com/wangletiand/gpt55-x402-gateway
- type: SourceCode
  url: https://github.com/wangletiand/gpt55-x402-gateway
- type: GitHub
  name: GitHub account (individual user, not an organization)
  url: https://github.com/wangletiand
- type: Security
  url: https://github.com/wangletiand/gpt55-x402-gateway/blob/main/SECURITY.md
- type: VulnerabilityDisclosure
  url: security/558686-xyz-vulnerability-disclosure.yml
- type: StatusPage
  name: Settlement and facilitator status (JSON only)
  url: https://gpt55.558686.xyz/x402/status
- type: Deprecation
  name: Split-host retirement policy (projects/split.json)
  url: https://gpt55.558686.xyz/projects/split.json
- type: Lifecycle
  url: lifecycle/558686-xyz-lifecycle.yml
- type: AgentCard
  url: a2a/558686-xyz-a2a.yml
- type: MCPServer
  url: mcp/558686-xyz-mcp.yml
- type: ToolCrosswalk
  url: mcp/558686-xyz-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/558686-xyz-llms.txt
- type: WellKnown
  url: well-known/558686-xyz-well-known.yml
- type: AIPlugin
  url: well-known/558686-xyz-ai-plugin.json
- type: APIsJson
  url: https://sub2api.558686.xyz/apis.json
- type: ContentSignal
  url: well-known/558686-xyz-content-signals-robots.txt
- type: Postman
  url: https://gpt55.558686.xyz/postman/collection.json
- type: Packages
  url: packages/558686-xyz-packages.yml
- type: SDKs
  url: packages/558686-xyz-packages.yml
- type: Authentication
  url: authentication/558686-xyz-authentication.yml
- type: Conventions
  url: conventions/558686-xyz-conventions.yml
- type: ErrorCatalog
  url: errors/558686-xyz-problem-types.yml
- type: Conformance
  url: conformance/558686-xyz-conformance.yml
- type: RateLimits
  url: rate-limits/558686-xyz-rate-limits.yml
- type: Plans
  url: plans/558686-xyz-plans-pricing.yml
- type: Sandbox
  url: sandbox/558686-xyz-sandbox.yml
- type: Examples
  url: examples/558686-xyz-standard-chat-example.json
- type: AgentSkill
  url: skills/_index.yml
- type: Overlay
  url: overlays/558686-xyz-gpt55-model-gateway-overlay.yaml
- type: DomainSecurity
  url: security/558686-xyz-domain-security.yml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 50
  pass: local-v3
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://gpt55.558686.xyz/.well-known/agent-card.json
  grade: conformant
  protocol_version: '1.0'
  control: 404

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