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Agent Card & Well-Known Validator
x402
Agent Card & Well-Known Validator is a paid API for AI agents from agent-card-validator-mcp.mtree.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).
Validates agent cards and .well-known routes for autonomous agents, returning provenance, route-specific evidence, and machine-readable compliance fields
Price / call$0.05
Success—
StatusUnknown
How this service works
Paid agent card and well-known validator route for autonomous agents. Returns JSON with provenance, route-specific evidence, and machine-readable fields. Price 0.05 USDC on Base via x402. Demo/preview: https://agent-card-validator-mcp.mtree.workers.dev/demo/audit. Contact: https://agent-card-validator-mcp.mtree.workers.dev/contact.
Output
A JSON object containing validation results with provenance information, route-specific evidence for each well-known endpoint audited, and machine-readable compliance fields indicating whether the agent card and associated routes meet expected standards.
Example use cases
Example prompt
“Can you audit the agent card and well-known routes for https://myagent.example.com and tell me if the provenance and machine-readable fields check out?”
Technical details
Endpoint
POSThttps://agent-card-validator-mcp.mtree.workers.dev/v1/wellknowns/auditWhen to prefer
Use this endpoint when you need to programmatically verify that an autonomous agent's card and .well-known discovery routes are correctly configured, accessible, and contain valid machine-readable fields. Prefer this over manual inspection when building agent registries, marketplaces, or orchestration systems that need to trust agent identity metadata. Especially useful for agentic pipelines that must confirm compliance before routing tasks to a discovered agent.
Side effects
- Target URL is unreachable or returns non-200 response — validation fails with connectivity error
- Agent card URL malformed or missing — returns error indicating invalid input
- Payment not provided or insufficient USDC via x402 — returns 402 Payment Required
- Well-known route returns unexpected content type or structure — partial validation with evidence of failure
- Rate limiting or Cloudflare Worker timeout on slow target domains
Input
{
"input": {
"body": {
"base_url": "https://example-agent.com"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"todo": [
"missing surface: agent_card",
"missing surface: openapi",
"missing surface: ai_plugin",
"missing surface: mcp",
"missing surface: agent_discovery"
],
"score": 0,
"detail": {
"openapi": {
"present": false
},
"ai_plugin": {
"present": false
},
"agent_card": {
"present": false
}
},
"base_url": "https://example-agent.com",
"presence": {
"mcp": false,
"openapi": false,
"ai_plugin": false,
"agent_card": false,
"agent_discovery": false
},
"surfaces": {
"mcp": "https://example-agent.com/mcp",
"openapi": "https://example-agent.com/openapi.yaml",
"ai_plugin": "https://example-agent.com/.well-known/ai-plugin.json",
"agent_card": "https://example-agent.com/.well-known/agent-card.json",
"agent_discovery": "https://example-agent.com/agent-discovery"
},
"audited_at": "2026-06-06T00:36:20.327Z",
"sub_scores": {
"openapi": 0,
"ai_plugin": 0,
"agent_card": 0,
"agent_discovery": 0
},
"presence_score": 0
}Tags
x402
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