agent402.dev

agent402.dev is a pay-per-call agent-commerce service that sells website release evidence and offline tools to AI agents over the x402 v2 protocol, settled in USDC on Base (eip155:8453) with no accounts, sign-up or API keys — payment is the authorization. Its primary product is a 5.00 USDC AI Discovery Site Audit: 22 deterministic technical SEO / AEO / GEO checks on one public HTTPS page plus five evidence-derived remediation slots for JSON-LD, metadata, robots.txt, llms.txt and sitemap.xml, with a free exact-body eligibility check, a live sample report and a machine-readable methodology published beside it. Seven auxiliary direct HTTP resources are priced from 0.01 to 5.99 USDC: a Verified URL Evidence Snapshot, a HEAD-only website preflight, an x402 endpoint health check and launch-readiness audit, a deterministic task-priority day scheduler, and two downloadable ZIP packs. The whole surface is published machine-first — an OpenAPI 3.1 contract at /openapi.json, an x402 v2 manifest at /.well-known/x402, a conformant A2A agent card, llms.txt and a JSON endpoint map at /meta.json — while the operator is not named anywhere on the site. An earlier MCP surface has been deliberately retired (410 Gone).

agent402.dev publishes 3 API contracts indexed on the APIs.io network: Developer tools API, Downloads API, and Productivity API. Tagged areas include Company, x402, Agentic Payments, Agentic Commerce, and AI Agents.

agent402.dev’s developer surface includes pricing, authentication, sandbox, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.7/100 developing ▬ flat Agent 37/100 agent ready Front door AI 4/6 moderate Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 3 Agent Skills

Company x402 Agentic Payments Agentic Commerce AI Agents A2ATechnical SEOWebsite AuditsURL EvidenceDeveloper Tools Base

Kin Score

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

Composite quality — 39.7/100 · developing

Contract Quality 10.9 / 21

Developer Ergonomics 8.4 / 17

Access Clarity 5.4 / 17

Operational Transparency 2.3 / 11

Contract Governance 1.9 / 10

Discoverability 5.5 / 9

Regulatory Posture 2.3 / 15

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 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 0 / 4

Consent & Bot Identity 0 / 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

Pagination 5 / 5

Distinct Operations 3 / 3

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 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):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
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)
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
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

5 more unmet checks in the Agent Readiness table above.

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

Access Clarity scores 31.6 — up to +13.7 composite points
Contract Quality scores 51.1 — up to +12.2 composite points
Operational Transparency scores 21.1 — up to +10.3 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/agent402-dev/apis.yml: open an issue on github.com/api-evangelist/agent402-dev 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 →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
AI Agents (A2A agent cards)	standard	23.6 (thin)	-	1
x402 Micropayments & Agentic Pay-per-Call	standard	23.6 (thin)	-	1

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

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 3

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

agent402.dev Developer tools API

The Developer tools API from agent402.dev — 9 operation(s) for developer tools.

agent402.dev Downloads API

The Downloads API from agent402.dev — 2 operation(s) for downloads.

agent402.dev Productivity API

The Productivity API from agent402.dev — 1 operation(s) for productivity.

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

capture-url-evidence

AGENT SKILL

check-x402-endpoint

AGENT SKILL

run-ai-discovery-site-audit

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Agent402 Dev Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Agent402 Dev Rate Limits

2 limits

RATE LIMITS

OpenAPI Overlays 1

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.

Agent402 Dev Openapi Overlay

18 actions · documentation · agent402-dev-openapi.yml

GENERATED

Examples 2

Example request and response payloads for these APIs.

Agent402 Dev Site Release Audit Sample

14 fields

EXAMPLE

Agent402 Dev Url Evidence 402 Challenge

5 fields

EXAMPLE

Security Posture 2

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

Agent402 Dev Authentication

1 scheme

SECURITY

Agent402 Dev Domain Security

TLSv1.3

SECURITY

Agentic Access 1

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

Agent402 Dev Agentic Access

12 operations · 6 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Sandbox

Sandbox

Agent Surfaces 6

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

LLMsTxt

LLMsTxt

WellKnown

WellKnown

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

AgentSkill

AgenticAccess

AgenticAccess

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Lifecycle

Conformance

DataModel

Build 1

SDKs, sample code, and the tooling you integrate with

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

Overlay

Overlay

AgentCard

AgentCard

RegulatoryPosture

RegulatoryPosture

Source (apis.yml)

aid: agent402-dev
name: agent402.dev
description: 'agent402.dev is a pay-per-call agent-commerce service that sells website release evidence and offline tools
  to AI agents over the x402 v2 protocol, settled in USDC on Base (eip155:8453) with no accounts, sign-up or API keys — payment
  is the authorization. Its primary product is a 5.00 USDC AI Discovery Site Audit: 22 deterministic technical SEO / AEO /
  GEO checks on one public HTTPS page plus five evidence-derived remediation slots for JSON-LD, metadata, robots.txt, llms.txt
  and sitemap.xml, with a free exact-body eligibility check, a live sample report and a machine-readable methodology published
  beside it. Seven auxiliary direct HTTP resources are priced from 0.01 to 5.99 USDC: a Verified URL Evidence Snapshot, a
  HEAD-only website preflight, an x402 endpoint health check and launch-readiness audit, a deterministic task-priority day
  scheduler, and two downloadable ZIP packs. The whole surface is published machine-first — an OpenAPI 3.1 contract at /openapi.json,
  an x402 v2 manifest at /.well-known/x402, a conformant A2A agent card, llms.txt and a JSON endpoint map at /meta.json —
  while the operator is not named anywhere on the site. An earlier MCP surface has been deliberately retired (410 Gone).'
image: https://agent402.dev/favicon.ico
url: https://raw.githubusercontent.com/api-evangelist/agent402-dev/refs/heads/main/apis.yml
x-type: company
x-source: harvest:a2a-registry
x-tier: profiled
x-tier-reason: 'Full local enrichment pass 2026-09-19 (was: stub / harvest:a2a-registry). Live x402 seller with OpenAPI, agent
  card, llms.txt and manifest all served from agent402.dev.'
x-operator: Not published — no company name, legal entity, contact, terms or privacy page anywhere on agent402.dev; the agent
  card names the provider organization only as "agent402.dev" and the Payan marketplace offer page that might name the seller
  returns 404.
specificationVersion: '0.20'
created: '2026-09-19'
modified: '2026-09-19'
tags:
- Company
- x402
- Agentic Payments
- Agentic Commerce
- AI Agents
- A2A
- Technical SEO
- Website Audits
- URL Evidence
- Developer Tools
- Base
apis:
- aid: agent402-dev:agent402-dev-developer-tools-api
  name: agent402.dev Developer tools API
  description: The Developer tools API from agent402.dev — 9 operation(s) for developer tools.
  humanURL: https://agent402.dev/
  tags:
  - Developer Tools
  tags_raw:
  - Developer tools
  properties:
  - type: OpenAPI
    url: openapi/agent402-dev-developer-tools-api-openapi.yml
  - type: Documentation
    url: https://agent402.dev/
  - type: Documentation
    url: https://agent402.dev/site-release-audit
  - type: Documentation
    url: https://agent402.dev/task-day-plan
  - type: Documentation
    url: https://agent402.dev/x402-audit
  - type: APIReference
    url: https://agent402.dev/
  - type: GettingStarted
    url: https://agent402.dev/
  - type: Examples
    url: examples/agent402-dev-examples.yml
  - type: X-X402Discovery
    url: https://agent402.dev/.well-known/x402
  - type: Metrics
    url: https://agent402.dev/metrics
- aid: agent402-dev:agent402-dev-downloads-api
  name: agent402.dev Downloads API
  description: The Downloads API from agent402.dev — 2 operation(s) for downloads.
  humanURL: https://agent402.dev/
  tags:
  - Downloads
  properties:
  - type: OpenAPI
    url: openapi/agent402-dev-downloads-api-openapi.yml
  - type: Documentation
    url: https://agent402.dev/
  - type: Documentation
    url: https://agent402.dev/site-release-audit
  - type: Documentation
    url: https://agent402.dev/task-day-plan
  - type: Documentation
    url: https://agent402.dev/x402-audit
  - type: APIReference
    url: https://agent402.dev/
  - type: GettingStarted
    url: https://agent402.dev/
  - type: Examples
    url: examples/agent402-dev-examples.yml
  - type: X-X402Discovery
    url: https://agent402.dev/.well-known/x402
  - type: Metrics
    url: https://agent402.dev/metrics
- aid: agent402-dev:agent402-dev-productivity-api
  name: agent402.dev Productivity API
  description: The Productivity API from agent402.dev — 1 operation(s) for productivity.
  humanURL: https://agent402.dev/
  tags:
  - Productivity
  properties:
  - type: OpenAPI
    url: openapi/agent402-dev-productivity-api-openapi.yml
  - type: Documentation
    url: https://agent402.dev/
  - type: Documentation
    url: https://agent402.dev/site-release-audit
  - type: Documentation
    url: https://agent402.dev/task-day-plan
  - type: Documentation
    url: https://agent402.dev/x402-audit
  - type: APIReference
    url: https://agent402.dev/
  - type: GettingStarted
    url: https://agent402.dev/
  - type: Examples
    url: examples/agent402-dev-examples.yml
  - type: X-X402Discovery
    url: https://agent402.dev/.well-known/x402
  - type: Metrics
    url: https://agent402.dev/metrics
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Overlay
  url: overlays/agent402-dev-openapi-overlay.yaml
- type: Website
  url: https://agent402.dev/
- type: Pricing
  name: Resource Catalog — per-call USDC price of every resource (homepage table); the machine-readable price list is the
    x402 manifest
  url: https://agent402.dev/
- type: LLMsTxt
  url: llms/agent402-dev-llms.txt
- type: LLMsTxt
  name: llms.txt as served by the provider
  url: https://agent402.dev/llms.txt
- type: AgentCard
  url: a2a/agent402-dev-a2a.yml
- type: WellKnown
  url: well-known/agent402-dev-well-known.yml
- type: X-MCPServerCandidate
  name: No MCP server — /mcp and /.well-known/mcp.json answer 410 Gone (a retired surface); this manifest records that evidence
    and an API-Evangelist-derived candidate tool list. NOT a live MCPServer.
  url: mcp/agent402-dev-mcp.yml
- type: Packages
  name: No first-party SDK; the provider pins four third-party npm buyer packages. The agent402-* npm namespace belongs to
    agent402.tools, a different company.
  url: packages/agent402-dev-packages.yml
- type: Authentication
  url: authentication/agent402-dev-authentication.yml
- type: Conventions
  url: conventions/agent402-dev-conventions.yml
- type: ErrorCatalog
  url: errors/agent402-dev-problem-types.yml
- type: Lifecycle
  url: lifecycle/agent402-dev-lifecycle.yml
- type: Conformance
  url: conformance/agent402-dev-conformance.yml
- type: DataModel
  url: data-model/agent402-dev-data-model.yml
- type: Sandbox
  url: sandbox/agent402-dev-sandbox.yml
- type: Plans
  url: plans/agent402-dev-plans-pricing.yml
- type: RateLimits
  url: rate-limits/agent402-dev-rate-limits.yml
- type: AgentSkill
  url: skills/_index.yml
- type: RegulatoryPosture
  url: regulatory/agent402-dev-regulatory-posture.yml
- type: DomainSecurity
  url: security/agent402-dev-domain-security.yml
- type: AgenticAccess
  url: agentic-access/agent402-dev-agentic-access.yml
x-enrichment:
  date: '2026-09-19'
  status: enriched
  artifacts_added: 28
  pass: local-v3
x-x402:
  verified: true
  probed: '2026-09-24'
  url: https://agent402.dev/download
  evidence:
  - header:payment-required
  control: 404
x-a2a:
  verified: true
  probed: '2026-09-26'
  url: https://agent402.dev/.well-known/agent-card.json
  grade: conformant
  protocol_version: 0.3.0
  control: 404

agent402.dev API — frequently asked questions

Does agent402.dev have an API?

Yes. APIs.io lists 3 APIs from agent402.dev, including agent402.dev Developer tools API, agent402.dev Downloads API and agent402.dev Productivity API.

Is there an OpenAPI specification for the agent402.dev API?

Yes. APIs.io indexes 3 OpenAPI specifications for agent402.dev, each linked for download from this page.

How do I authenticate with the agent402.dev API?

agent402.dev uses bearer-token authentication (1 scheme). The details are profiled on APIs.io as Agent402 Dev Authentication.

How much does the agent402.dev API cost?

APIs.io lists 1 pricing plan for agent402.dev, with each plan's price, limits and inclusions under Pricing Plans on this page.

Is the agent402.dev API ready for AI agents?

agent402.dev has a Kin Score of 39.7 out of 100 (developing) and an Agent Readiness score of 37.3 (agent-ready), scored by API Evangelist on 2026-10-31.

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