x402supply-com

x402 Supply provides a suite of pay-per-call API tools designed for AI agents, enabling developers to integrate specialized functionalities such as timezone conversion, token verification, and data extraction on a per-call basis. Operating on the Base blockchain with USDC payments, the platform eliminates the need for traditional API keys or accounts, offering a frictionless, usage‑based billing model. The service catalog includes tools for financial data, compliance checks, and AI‑enhanced utilities, all accessible via simple HTTP endpoints.

x402supply-com publishes 3 API contracts indexed on the APIs.io network: Chess Eval API, Endpoint Diligence API, and Entity Resolve API. Tagged areas include Company, API, AI, Pay-per-call, and Blockchain.

The x402supply-com catalog on APIs.io includes 1 Spectral governance ruleset.

🌐 Visit website 📡 Profile data on GitHub

19.7/100 emerging Agent 23/100 agent aware Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

3 published contracts 1 MCP Servers

CompanyAPIAIPay-per-callBlockchain Tools

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 19.7/100 · emerging

Contract Quality 9.5 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.7 / 9

Regulatory Posture 1.5 / 15

Agent readiness — 23/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

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/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

8 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 0.0 — up to +20.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Contract Quality scores 44.6 — up to +13.9 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/x402supply-com/apis.yml: open an issue on github.com/api-evangelist/x402supply-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 3

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

x402supply-com Chess Eval API

The chess-eval API from x402supply-com — 3 operation(s) for chess-eval.

x402supply-com Endpoint Diligence API

The endpoint-diligence API from x402supply-com — 4 operation(s) for endpoint-diligence.

x402supply-com Entity Resolve API

The entity-resolve API from x402supply-com — 2 operation(s) for entity-resolve.

MCP Servers 1

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

x402supply-com MCP Server

Remote MCP server at chess-eval.x402supply.com.

MCP SERVER

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

x402supply-com API Rules

12 rules · 10 errors 1 warnings 1 info

SPECTRAL

Security Posture 1

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

X402Supply Com Domain Security

TLSv1.3

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

X402Supply Com Agentic Access

9 operations · 9 acting

AGENTIC

Resources

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

LLMsIndex

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Spectral

Vocabulary

ErrorCatalog

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

ToolCrosswalk

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

TrustPage

TrustPage

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: x402supply-com
name: x402supply-com
description: x402 Supply provides a suite of pay-per-call API tools designed for AI agents, enabling developers to integrate
  specialized functionalities such as timezone conversion, token verification, and data extraction on a per-call basis. Operating
  on the Base blockchain with USDC payments, the platform eliminates the need for traditional API keys or accounts, offering
  a frictionless, usage‑based billing model. The service catalog includes tools for financial data, compliance checks, and
  AI‑enhanced utilities, all accessible via simple HTTP endpoints.
url: https://artifacts.apis.io/x402supply-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-29 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-29'
modified: '2026-10-29'
tags:
- Company
- API
- AI
- Pay-per-call
- Blockchain
- Tools
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/x402supply-com-agentic-access.yml
- type: Spectral
  url: rules/x402supply-com-rules.yml
- type: Vocabulary
  url: vocabulary/x402supply-com-vocabulary.yml
- type: ErrorCatalog
  url: errors/x402supply-com-problem-types.yml
- type: Conformance
  url: conformance/x402supply-com-conformance.yml
- type: LLMsTxt
  url: llms/x402supply-com-llms.txt
- type: ToolCrosswalk
  url: mcp/x402supply-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/x402supply-com-mcp.yml
- type: Hosts
  url: hosts/x402supply-com-hosts.yml
- type: Vendors
  url: vendors/x402supply-com-vendors.yml
- type: DomainSecurity
  url: security/x402supply-com-domain-security.yml
- type: Website
  url: https://x402supply.com/
- type: TrustPage
  url: https://x402supply.com/trust
- type: LLMsIndex
  url: https://x402supply.com/llms.txt
apis:
- aid: x402supply-com:x402supply-com-chess-eval-api
  name: x402supply-com Chess Eval API
  description: The chess-eval API from x402supply-com — 3 operation(s) for chess-eval.
  humanURL: https://chess-eval.x402supply.com/
  baseURL: https://chess-eval.x402supply.com
  tags:
  - chess-eval
  properties:
  - type: OpenAPI
    url: openapi/x402supply-com-chess-eval-api-openapi.yml
- aid: x402supply-com:x402supply-com-endpoint-diligence-api
  name: x402supply-com Endpoint Diligence API
  description: The endpoint-diligence API from x402supply-com — 4 operation(s) for endpoint-diligence.
  humanURL: https://chess-eval.x402supply.com/
  baseURL: https://diligence.x402supply.com
  tags:
  - endpoint-diligence
  properties:
  - type: OpenAPI
    url: openapi/x402supply-com-endpoint-diligence-api-openapi.yml
- aid: x402supply-com:x402supply-com-entity-resolve-api
  name: x402supply-com Entity Resolve API
  description: The entity-resolve API from x402supply-com — 2 operation(s) for entity-resolve.
  humanURL: https://chess-eval.x402supply.com/
  baseURL: https://entity-resolve.x402supply.com
  tags:
  - entity-resolve
  properties:
  - type: OpenAPI
    url: openapi/x402supply-com-entity-resolve-api-openapi.yml
x-enrichment:
  date: '2026-10-29'
  status: enriched
  artifacts_added: 18
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

x402supply-com API — frequently asked questions

Does x402supply-com have an API?

Yes. APIs.io lists 3 APIs from x402supply-com, including x402supply-com Chess Eval API, x402supply-com Endpoint Diligence API and x402supply-com Entity Resolve API.

Is there an OpenAPI specification for the x402supply-com API?

Yes. APIs.io indexes 3 OpenAPI specifications for x402supply-com, each linked for download from this page.

Does x402supply-com have an MCP server?

Yes. APIs.io lists 1 MCP server for x402supply-com: Remote MCP server at chess-eval.x402supply.com.

Is the x402supply-com API ready for AI agents?

x402supply-com has a Kin Score of 19.7 out of 100 (emerging) and an Agent Readiness score of 23.1 (agent-aware), scored by API Evangelist on 2026-10-31.

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