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Agent Card Discovery Decision
x402
Agent Card Discovery Decision is a paid API for AI agents from agentreadiness.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).
Fetches public evidence from a target URL and evaluates whether it exposes a valid agent card, returning a verdict, evidence source, threshold, and recommended action.
Price / call$0.001
Success—
StatusUnknown
How this service works
Agent card discovery decision fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.
Output
Returns an observation describing what was found at the target, the evaluation threshold, a pass/fail verdict, the exact evidence source URL, any limitations of the passive check, and a mode-specific recommended action. No login, form submission, or active probing is performed.
Example use cases
Pre-integration agent card check
“Before I integrate with https://payments.acme.com, can you verify whether they have an agent card published? I want to see the verdict and where the evidence came from.”
AI readiness audit for own domain
“Audit my site at https://myservice.io and tell me if it passes the agent card discovery check — I want to know the observation, any limitations, and what action I should take.”
Comparing two domains for agent card support
“Compare https://platform-a.com and https://platform-b.com to see which one has a better agent card setup — give me the verdict and evidence source for each.”
Technical details
Endpoint
POSThttps://agentreadiness.halowerk.com/v1/agent-card-decision?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a passive, read-only check specifically for agent card presence and validity on a public URL. Prefer it over general crawling or manual inspection when you need a structured verdict with evidence sourcing and actionable guidance. Use it as a pre-integration step before connecting to a third-party service, or as part of an automated AI readiness audit pipeline. It complements sibling endpoints for OpenAPI discovery, llms.txt, and header semantics.
Side effects
- Target URL is unreachable or returns non-200 status — verdict may be inconclusive
- Agent card path exists but is malformed — observation notes the issue but verdict may still fail
- Domain normalization fails for non-standard URLs — request rejected with validation error
- Rate limits or network timeouts during passive fetch — partial or no evidence returned
- Target blocks crawlers — evidence source unavailable, limitations noted in response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| target | string | Public HTTP(S) URL or domain to inspect. A bare domain is normalized to HTTPS. |
| context | object | Optional non-secret correlation labels returned unchanged only in the request lifecycle. |
| baseline | — | Optional baseline returned by a previous snapshot call. |
| compare_url | string | Optional public comparison URL. Used by change and monitoring services. |
Tags
x402
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