Back to Browse
Assay A2A & MCP Security Observatory
x402
Assay A2A & MCP Security Observatory is a paid API for AI agents from assay.agentdiet.dev, paid per call via x402 or MPP, $0.005/call, status unknown (last checked 2026-10-21).
Runs a cryptographic pre-flight security audit, schema conformance check, and TDQS reputation scoring on A2A, MCP, or x402 endpoints, returning a grade, score, and allow/deny verdict.
Price / call$0.005
Success—
StatusUnknown
How this service works
Live A2A & MCP endpoint security auditor, Tool Definition Quality Score (TDQS) certifier, prompt-injection scanner, and cryptographic trust oracle.
Output
Returns a JSON object containing a 'dossier' with a letter grade (e.g. 'A'), a numeric score (0-100), and the audited target URL; a 'verdict' of 'allow' or 'deny'; and a 'receipt' token string for record-keeping.
Example use cases
Pre-flight check before agent tool use
“Before my agent calls that new MCP tool at https://tools.example.com, run a security audit on it with a GET request and tell me if it's safe — I want to see the grade and whether it gets an allow verdict.”
Vetting an x402 payment endpoint
“I'm about to wire my agent to an x402 payment endpoint at https://pay.vendor.dev — can you certify it first and give me the TDQS score so I know it's not a risk?”
Screening A2A endpoints in a marketplace
“I found an A2A endpoint at https://agent.marketplace.io that I want to integrate — please audit it using a GET and show me the full security dossier before I proceed.”
Technical details
Endpoint
GEThttps://assay.agentdiet.dev/v1/certify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a structured, scored security verdict on an agentic endpoint (A2A, MCP, or x402) before connecting or integrating it — especially when you require a letter grade, TDQS reputation score, schema conformance check, and a formal allow/deny verdict in a single call. Prefer it over generic port scanners or HTTP linters when the target is specifically an AI agent protocol endpoint and you need audit receipts for compliance or logging.
Side effects
- Target URL is unreachable or returns non-standard responses — audit may fail or return incomplete dossier
- Invalid or missing 'target' query parameter — request rejected with schema validation error
- Endpoint does not conform to A2A/MCP/x402 protocols — may return low score or deny verdict
- Payment not attached or insufficient USDC — x402 payment required error
- Target URL times out during cryptographic probe — partial or failed audit result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"dossier": {
"grade": "A",
"score": 95,
"target": "https://example.com"
},
"receipt": "asr_rcpt_sample",
"verdict": "allow"
}
}Tags
x402
Reviews
No reviews yet. Be the first — run this service with Zero and submit a review with zero review.
How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"