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Agent Card Validator MCP

https://agent-card-validator-mcp.mtree.workers.dev/v1/wellknowns/audit
● healthy a2a-agent

Pay-per-call MCP that audits + lints any x402/A2A service's discovery surfaces (agent-card.json, ai-plugin.json, openapi.yaml, mcp.json, agent-discovery). Returns a 0-100 quality score plus an improvement TODO list and a strict JSON-schema lint report. Helps agents and developers grade x402 services on completeness/quality before integration. USDC on Base via x402 — no signup, no API key.

Category
a2a-agent
Chains
base
Price
$0.0500 USDC / call

Quality grade

How grading works
C+ 60.0 / 100
Availability 40.0 / 40
Endpoint responded (HTTP 204)
Payability 20.0 / 20
  • ✓ Answers a real HTTP 402 challenge
  • ✓ Publishes a /.well-known/x402 descriptor
  • ✓ Payment address on record
  • ✓ Settlement network declared
  • ✓ Price declared
Demand 0.0 / 40
Payment address on record, not yet queried on-chain
Owner verified 0.0 / 3
Nobody has claimed this listing yet
Endpoint last checked 7 h ago. Availability and on-chain demand are both re-probed daily; the grade updates automatically on the next pass.

Paid endpoints

2 resource(s) advertised by this origin.

POST https://agent-card-validator-mcp.mtree.workers.dev/v1/wellknowns/audit

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-validat

POST https://agent-card-validator-mcp.mtree.workers.dev/v1/wellknowns/lint

Paid agent card and well-known validator route for autonomous agents. Returns JSON with provenance, route-specific evidence, and machine-readable fields. Price 0.03 USDC on Base via x402. Demo/preview: https://agent-card-validator-mcp.mtree.workers.dev/demo/lint. Contact: https://agent-card-validato

How to call

cURL · x402-fetch / x402-axios will auto-handle 402
curl -X POST https://agent-card-validator-mcp.mtree.workers.dev/v1/wellknowns/audit
/.well-known/x402.json
https://agent-card-validator-mcp.mtree.workers.dev/.well-known/x402

Listed in

Directories this entry was found in.

a2a x402