x402 List API

An open, machine-readable, live-monitored directory of services that accept x402 protocol payments (HTTP 402 Payment Required). Self-described as agent-first, it exposes service listings, uptime metrics, pricing, facilitator settlement data, and rankings as JSON for autonomous agents, aggregators, and integrations.

x402 List API publishes 1 API on the APIs.io network: x402 List API. Tagged areas include x402, crypto, 402, agentic-payments, and API directory.

The x402 List API catalog on APIs.io includes 1 Spectral governance ruleset.

x402 List API’s developer surface includes engineering blog, support, and 12 more developer resources.

📡 Source on GitHub

56.6/100 strong Agent 30/100 agent ready Full breakdown ↓
scored 2026-09-02 · rubric v0.18.0

1 APIs 2 MCP Servers

x402crypto402agentic-paymentsAPI directoryregistryAI agentsblockchaindeveloper toolsuptime monitoring

Kin Score

Kin Score How this is scored →
scored 2026-09-02 · rubric v0.18.0

Composite quality — 56.6/100 · strong

Contract Quality 7.1 / 21

Developer Ergonomics 10.0 / 17

Access Clarity 8.9 / 17

Operational Transparency 7.6 / 11

Contract Governance 5.1 / 10

Discoverability 7.4 / 9

Regulatory Posture 7.3 / 15

Agent readiness — 30/100 · 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 0 / 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 0 / 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 Surface 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.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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/x402-list-api: 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 →

APIs 1

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

x402 List API

Public REST API (OpenAPI 3.1) providing access to the x402 services directory, uptime, pricing, facilitator volumes, networks, stats, rankings, and change events. Free reads (ra...

MCP Servers 2

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

Rate Limits 1

Documented rate limits and quota policies.

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

WellKnown

WellKnown

Build 2

SDKs, sample code, and the tooling you integrate with

Packages

Packages

GitHubRepository

GitHubRepository

Access & Security 4

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

SecurityTxt

SecurityTxt

Security

Security

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Blog

Blog

Other 3

Properties that don't map to a standard resource type

APICatalog

APICatalog

ContentSignal

ContentSignal

APIsJSON

APIsJSON

Source (apis.yml)

name: x402 List API
description: An open, machine-readable, live-monitored directory of services that accept x402 protocol payments (HTTP 402
  Payment Required). Self-described as agent-first, it exposes service listings, uptime metrics, pricing, facilitator settlement
  data, and rankings as JSON for autonomous agents, aggregators, and integrations.
image: https://x402-list.com/og-image.png
url: https://raw.githubusercontent.com/api-evangelist/x402-list-api/refs/heads/main/apis.yml
created: '2026-09-02'
modified: '2026-09-02'
specificationVersion: '0.21'
tags:
- x402
- crypto
- '402'
- agentic-payments
- API directory
- registry
- AI agents
- blockchain
- developer tools
- uptime monitoring
apis:
- name: x402 List API
  description: Public REST API (OpenAPI 3.1) providing access to the x402 services directory, uptime, pricing, facilitator
    volumes, networks, stats, rankings, and change events. Free reads (rate-limited), with x402 pay-per-request metering for
    bulk usage.
  humanURL: https://x402-list.com/api
  baseURL: https://x402-list.com/api/v1
  tags:
  - x402
  - crypto
  - '402'
  - agentic-payments
  - API directory
  - registry
  - AI agents
  - blockchain
  - developer tools
  - uptime monitoring
  properties:
  - type: OpenAPI
    url: https://x402-list.com/api/v1/openapi.json
  - type: Documentation
    url: https://x402-list.com/api
  - type: LLMsTxt
    url: https://x402-list.com/llms.txt
  - type: LLMsTxt
    url: https://x402-list.com/llms-full.txt
  - type: MCPServer
    url: https://mcp.x402-list.com/mcp
  - type: OpenAPI
    url: openapi/x402-list-api-openapi.yml
  - type: DeveloperPortal
    url: https://x402-list.com/api
  - type: APIReference
    url: https://x402-list.com/api
  - type: GettingStarted
    url: https://x402-list.com/api
  - type: LLMsTxt
    url: llms/x402-list-api-llms.txt
  - type: MCPServer
    url: mcp/x402-list-api-mcp.yml
  - type: ToolCrosswalk
    url: mcp/x402-list-api-tool-crosswalk.yml
  - type: Authentication
    url: authentication/x402-list-api-authentication.yml
  - type: ErrorCatalog
    url: errors/x402-list-api-problem-types.yml
  - type: RateLimits
    url: rate-limits/x402-list-api-rate-limits.yml
  - type: Plans
    url: plans/x402-list-api-plans-pricing.yml
  - type: Pricing
    url: https://x402-list.com/api
  - type: Conventions
    url: conventions/x402-list-api-conventions.yml
  - type: DataModel
    url: data-model/x402-list-api-data-model.yml
  - type: Lifecycle
    url: lifecycle/x402-list-api-lifecycle.yml
  - type: StatusPage
    url: https://x402-list.com/status
  - type: ChangeLog
    url: changelog/x402-list-api-changelog.yml
  - type: Conformance
    url: conformance/x402-list-api-conformance.yml
  - type: Overlay
    url: overlays/x402-list-api-openapi-overlay.yaml
  - type: AgentSkill
    url: skills/_index.yml
  - type: SpectralRules
    url: rules/x402-list-api-spectral.yaml
common:
- type: VulnerabilityDisclosure
  url: security/x402-list-api-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/x402-list-api-domain-security.yml
- type: WellKnown
  url: well-known/x402-list-api-well-known.yml
- type: APICatalog
  url: https://x402-list.com/.well-known/api-catalog
- type: SecurityTxt
  url: well-known/x402-list-api-security.txt
- type: Security
  url: security/x402-list-api-vulnerability-disclosure.yml
- type: ContentSignal
  url: https://x402-list.com/robots.txt
- type: APIsJSON
  url: https://x402-list.com/.well-known/apis.json
- type: Packages
  url: packages/x402-list-api-packages.yml
- type: Blog
  url: https://x402-list.com/blog
- type: Support
  url: https://x402-list.com/contact
- type: TermsOfService
  url: https://x402-list.com/terms
- type: PrivacyPolicy
  url: https://x402-list.com/privacy
- type: GitHubRepository
  url: https://github.com/mcccsm/x402-list-mcp
maintainers:
- FN: Cosimo Miccolis
  org: x402 List
  email: info@x402-list.com
  url: https://x402-list.com
  X-role: operator and data controller (individual, Italy) — as declared in https://x402-list.com/.well-known/apis.json and
    https://x402-list.com/llms.txt
generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 97
  at: '2026-09-02T09:37:38.394Z'
x-enrichment:
  date: '2026-09-02'
  status: enriched
  artifacts_added: 29
  pass: local-v1

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/x402-list-api"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/x402-list-api/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/x402-list-api/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

x402 List API

Kin Score

APIs 1

x402 List API

MCP Servers 2

x402 List API MCP Server

x402 List API MCP Server

Pricing Plans 1

X402 List Api Plans Pricing

Rate Limits 1

X402 List Api Rate Limits

Spectral Rules 1

x402 List API API Rules

Security Posture 3

X402 List Api Authentication

X402 List Api Domain Security

X402 List Api Vulnerability Disclosure

Resources

Agent Surfaces 1

Build 2

Access & Security 4

Operate 1

Commercial 2

Company 1

Other 3

Source (apis.yml)

Work with this as data

MCP server

Tools for providers

Call it yourself

Get an API key