Agent builder tools · x402

a2a-agent-card

A2A Agent Card validator and generator (A2A 1.0, detects and flags v0.3 cards): supportedInterfaces, protocolBinding/protocolVersion, capabilities, media-type modes, skills, provider, security schemes/requirements, JWS signature structure. Validate by URL (fetches /.well-known/agent-card.json) or inline JSON; or mode=generate from name, description, endpoint and skills.

0.002 USDC / call · {atomic} atomic · 2000 atomic

Endpoint

GET|POST https://forge-tools.dentreprise.workers.dev/api/a2a-agent-card

Parameters

Name	Required	Type	Description
`url`	Optional	string	Agent origin or card URL
`card`	Optional	object	Inline Agent Card JSON (POST)
`mode`	Optional	string	validate (default) or generate
`name`	Optional	string	generate: agent name
`description`	Optional	string	generate: description
`endpoint`	Optional	string	generate: A2A endpoint https URL
`skills`	Optional	string	generate: JSON array or comma-separated skill names

Example request (unpaid — expect 402)

curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/a2a-agent-card?url=https%3A%2F%2Fexample.com"

Example 402 challenge

The same object is also sent as a base64 PAYMENT-REQUIRED header. Amounts are atomic USDC units (6 decimals).

{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://forge-tools.dentreprise.workers.dev/api/a2a-agent-card",
    "description": "A2A Agent Card validator and generator (A2A 1.0, detects and flags v0.3 cards): supportedInterfaces, protocolBinding/protocolVersion, capabilities, media-type modes, skills, provider, security schemes/requirements, JWS signature structure. Validate by URL (fetches /.well-known/agent-card.json) or inline JSON; or mode=generate from name, description, endpoint and skills.",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "2000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Retry with payment

curl -sS "https://forge-tools.dentreprise.workers.dev/api/a2a-agent-card?url=https%3A%2F%2Fexample.com" \
  -H "PAYMENT-SIGNATURE: $PAYMENT"

Example response

{
  "mode": "validate",
  "spec_version_detected": "1.0",
  "valid": true,
  "errors": 0,
  "warnings": 1,
  "issues": []
}

Related endpoints

Agent builder tools · x402

openapi-lint

OpenAPI linter for agent readiness: version, info, servers, operationId presence/uniqueness/LLM-safe names, summaries, parameter schemas and descriptions, path placeholders, success and error responses, JSON examples.

0.002 USDC/ call

Documentation →

Agent builder tools · x402

json-schema-validate

Validate LLM/agent JSON output against a JSON Schema (2020-12 subset) and auto-repair typical errors: code fences, trailing commas, numbers/booleans as strings, wrong enum case, single value instead of array, null optionals, extra or mis-cased keys, missing defaults.

0.001 USDC/ call

Documentation →