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K-2SO Agent Discovery Surface Verification Standard
x402
K-2SO Agent Discovery Surface Verification Standard is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.012/call, status down (last checked 2026-10-18).
Returns a paid LLM-generated or deterministic decision procedure brief explaining how an autonomous agent should verify a merchant's discovery surface (the agent-facing catalog, metadata, and advertisement layer) for correctness and trustworthiness.
Price / call$0.012
Success—
StatusDown
How this service works
Deterministic pre-payment procedure for verifying a merchant's agent discovery surfaces (well-known/agent.json, llms.txt, x402 payment meta, A2A agent card, plugin manifest). Includes consistency checks across all five surfaces, impersonation detection via domain and cryptographic fingerprint matching, stale-price detection against on-file quote or previous state, and divergence kill rules that abort payment when any surface disagrees on identity, capability, endpoint, or price. Returns a PASS,
Output
A JSON object containing a plain-prose decision procedure brief (120+ words) describing step-by-step how an agent should verify a merchant's discovery surface, along with metadata including the service slug, generation source (llm, reasoning, or deterministic), the model used if LLM-generated, the topic, and an ISO-8601 generation timestamp. The 'paid' flag confirms successful payment settlement.
Example use cases
Pre-purchase catalog trust check
“Before my agent pays for any x402 service it found in a bazaar, I want it to run through the discovery surface verification standard so it knows exactly what checks to perform — can you fetch that decision procedure brief from K-2SO?”
Building a compliant x402 merchant listing
“I'm building an x402 merchant agent and want to make sure my catalog metadata will pass scrutiny — pull the agent discovery surface verification decision procedure so I know exactly what other agents will check before calling my services.”
Auditing a suspicious API listing
“My agent found a suspiciously cheap x402 service in a catalog and I want it to follow a proper verification procedure before paying — fetch the K-2SO discovery surface verification brief and have my agent run through each step against that listing.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-discovery-surface-verification-standard?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent needs a ready-made, authoritative decision procedure for verifying whether a merchant's x402 discovery surface (catalog entry, metadata, advertised capabilities) is accurate and trustworthy — especially before committing micropayments to unknown merchants. Prefer this over writing ad-hoc verification logic when operating in x402-based agent commerce environments where catalog integrity is a concern. It is particularly useful for agents that need auditable, prose-form procedural guidance they can log and cite in dispute resolution.
Side effects
- HTTP 402 returned if USDC payment not yet settled — agent must pay exact amount and retry with PAYMENT-SIGNATURE header
- Invalid method (POST, PUT, etc.) not accepted — only GET, HEAD, DELETE allowed
- Malformed input object missing required 'type' or 'method' fields returns validation error
- Topic override string may produce an off-topic or lower-quality brief if poorly phrased
- Network or provider outage on k2so.wrong.systems returns 5xx; no refund mechanism described
- Free metadata preview (meta=1) returns schema/description only, not the full decision procedure brief
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "agent-discovery-surface-verification-standard",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-discovery-surface-verification-standard",
"provider": "K-2SO"
}
}Tags
x402
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