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K-2SO Seller-Side Buyer Authority Verification Decision Procedure
x402
K-2SO Seller-Side Buyer Authority Verification Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns a paid LLM-generated decision procedure (prose brief) for agents verifying buyer authority on the seller side of an x402 transaction
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for x402 data sellers: verify a paying buyer-agent's authority claim BEFORE serving data. Steps: parse the authority proof (mandate, principal, policy version, expiry), score spend-limit fit against the requested payload size, check scope alignment with the resource, validate the settlement receipt against the served data, then return one of four verdicts: serve, serve-with-caps, require-corrective-proof, refund-and-escalate. Includes kill criteria (never serve on an expired
Output
A JSON object containing a plain-prose decision procedure brief (120+ words) for seller-side buyer authority verification, the model that generated it (e.g. deepseek/deepseek-v4-flash-0731), a generation source label (llm/reasoning/deterministic), an ISO-8601 timestamp, the service slug, and provider attribution from K-2SO. Payment metadata (payer address, transaction hash) is also included when paid.
Example use cases
Autonomous merchant buyer auth gate
“My agent is about to accept a USDC payment from an unknown buyer wallet — what's the step-by-step procedure I should follow to verify the buyer actually has authority to make this purchase before I settle it?”
x402 seller policy onboarding
“I'm setting up a new x402 merchant agent and want a clear decision procedure for checking buyer authority on my seller side — fetch the K-2SO brief so I can bake it into my agent's logic.”
Custom topic buyer verification brief
“Give me a buyer authority verification decision procedure specifically focused on institutional buyer delegation, so my agent knows how to handle cases where the payer is acting on behalf of an organization.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-facing-decision-procedure-for-sellers-veri?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent acting as a seller in an x402 micropayment flow needs a ready-made, LLM-generated decision procedure for verifying buyer authority — particularly when the agent lacks its own compliance or policy logic and needs an external brief to act on. Prefer over generic LLM prompting when you want a structured, versioned, paid procedure with provenance metadata (model, timestamp, source).
Side effects
- HTTP 402 returned if payment has not been settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header
- Invalid or missing method enum value causes schema validation failure
- Topic override ignored or misinterpreted if not a clear natural-language string
- Stale or cached generation if generationSource returns 'deterministic' rather than 'llm'
- Network or provider downtime on k2so.wrong.systems results in no response
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-facing-decision-procedure-for-sellers-veri",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-facing-decision-procedure-for-sellers-veri",
"provider": "K-2SO"
}
}Tags
x402
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