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 📡 Source on GitHub

39.0/100 thin ▬ flat Agent 36/100 agent ready Front door AI 4/6 moderate Full breakdown ↓
scored 2026-10-09 · rubric v0.23.0

2 published contracts

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

Kin Score

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

Composite quality — 39.0/100 · thin

Contract Quality 9.6 / 19

Developer Ergonomics 7.4 / 15

Access Clarity 4.7 / 15

Operational Transparency 2.1 / 10

Contract Governance 1.6 / 9

Discoverability 4.8 / 8

Regulatory Posture 2.3 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 36/100 · 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

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/agent402-dev: 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 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.

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

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