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A2A Agent Card Check
x402
A2A Agent Card Check is a paid API for AI agents from gogeta2-u35175.vm.elestio.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).
Fetch and validate a peer agent's A2A Agent Card (v1.0/v0.3), scoring it 0-100 with detailed field, skill, auth, signature, and reachability analysis.
Price / call$0.01
Success—
StatusUnknown
How this service works
Fetch and validate a peer agent's A2A Agent Card (v1.0 / v0.3): fields, skills, interfaces, auth, signature, reachability. Score 0-100 + issues.
Output
Returns a validation score from 0 to 100 along with a structured list of issues found in the agent card, covering field completeness, declared skills, interface definitions, authentication configuration, cryptographic signature validity, and network reachability of the agent endpoint.
Example use cases
Pre-integration agent card audit
“Before I integrate with the agent at https://someagent.example.com, can you fetch and validate its A2A agent card and tell me the score and any problems with the fields, skills, or authentication setup?”
Checking agent card version compliance
“I need to know if the agent hosted at https://myagentplatform.io is serving a compliant A2A v1.0 card — can you check the card, score it, and list any missing or invalid fields?”
Debugging a failing agent card
“My agent at https://beta.gogeta2.app seems to have issues with its A2A card — can you probe it and tell me exactly what's wrong, including reachability and signature validation?”
Technical details
Endpoint
GEThttps://gogeta2-u35175.vm.elestio.app/agents/v1/agent/a2a-card?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to programmatically validate a peer agent's A2A Agent Card before integrating with it, onboarding it into a multi-agent system, or troubleshooting interoperability issues. It is purpose-built for A2A protocol compliance checking (v1.0 and v0.3) and provides a structured score plus actionable issues list — more thorough than a generic HTTP probe or MCP server check.
Side effects
- URL unreachable or returns non-200 status — reachability failure reported in issues
- Agent card malformed JSON — parse error with details
- A2A card version unsupported — version mismatch flagged
- No agent card found at /.well-known/agent.json — card not found error
- Signature verification fails — cryptographic issue flagged in results
- Input URL missing or invalid format — 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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