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DDG Discovery Diff — Agent-Payable Well-Known Surface Auditor
x402
DDG Discovery Diff — Agent-Payable Well-Known Surface Auditor is a paid API for AI agents from agents.daedalusdevelopmentgroup.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Fetches all well-known discovery surfaces (A2A, ACP, UCP, AP2, x402), extracts claimed endpoint URLs and capabilities, probes each one at runtime (verifying payment endpoints return 402 not 200), and returns a signed per-surface claim-vs-runtime mismatch report.
Price / call$0.01
Success—
StatusUnknown
How this service works
A2A/ACP/UCP/AP2/x402 discovery cross-check: fetch every well-known surface, extract the claimed endpoint URLs + capabilities, PROBE each claimed endpoint (payment endpoints must answer 402, not 200), and report per-surface claim-vs-runtime mismatches with a signed verdict. $0.01.
Output
A signed, per-surface audit report listing each well-known discovery surface (A2A, ACP, UCP, AP2, x402) with the claimed vs observed endpoint URLs and capabilities, specific probe results for each claimed endpoint (including whether payment endpoints correctly return HTTP 402), and a final verdict indicating claim-vs-runtime mismatches or confirmation of consistency.
Example use cases
Pre-integration service integrity check
“Before I start paying to use this new agent service at https://vendor-agent.example.com, can you probe all its discovery surfaces and confirm that what it claims to offer actually matches what's running — especially that its paid endpoints are returning 402 and not just 200?”
Post-deploy discovery drift detection
“I just deployed a new version of my agent service and I want to make sure nothing broke — can you cross-check all the well-known surfaces against the live endpoints and give me a signed verdict on any claim-vs-runtime mismatches?”
Marketplace listing verification
“This agent listed on the bazaar claims to support x402 payments and certain capabilities — can you run a discovery diff on it at https://listed-agent.bazaar.example.com and tell me if the runtime actually matches those claims?”
Technical details
Endpoint
POSThttps://agents.daedalusdevelopmentgroup.com/v1/commerce/discovery-diff?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify that an agent service's self-described capabilities match its live runtime behavior, particularly in agentic commerce contexts where payment endpoints must correctly implement x402 (HTTP 402). Prefer this over manual inspection or simple HTTP checks when you need a signed, structured verdict across multiple discovery protocol surfaces simultaneously.
Side effects
- Target service is unreachable — probe times out or returns connection errors for all surfaces
- Discovery surfaces return malformed or non-standard documents that cannot be parsed
- Payment endpoints return 200 instead of 402, flagged as a misconfiguration
- Target URL is missing or malformed in the request body
- Service blocks automated probes, returning 403 or rate-limit responses
- Partial surface availability — some well-known surfaces found but others missing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Tags
x402
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