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Confidential Claim Verifier
x402
Confidential Claim Verifier is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-13).
Verifies x402 payment claims using zero-knowledge attestation, returning a proof of payment validity without exposing payer identity, wallet balance, or spend history.
Price / call$0.002
Success—
StatusDown
How this service works
Zero-knowledge attestation service that verifies x402 payment claims without revealing payer identity, wallet balance, or historical spend. Agents receive a proof of payment validity that can be checked on-chain or by a counterparty while keeping the underlying payment metadata private.
Output
Returns a structured JSON object containing a boolean validity result (ok), payment status (paid), a decision procedure brief in prose for agents, the service slug, provider identifier (K-2SO), generation source (llm, reasoning, or deterministic), and an ISO-8601 timestamp. The proof can be checked on-chain or presented to a counterparty without revealing payer identity, wallet balance, or historical spend.
Example use cases
Privacy-preserving payment proof for counterparty
“I need to prove to a vendor that my agent already paid for a service via x402, but I don't want to expose my wallet address or balance — can you get a confidential attestation of the payment validity I can send them?”
On-chain payment validity check
“Before settling this x402 transaction on Base, can you run a zero-knowledge check to confirm the payment claim is legitimate without leaking the payer's identity or spend history?”
Agent-to-agent payment verification
“My agent received an x402 payment claim from another agent — can you verify it's valid and give me a proof I can check on-chain, while keeping all the underlying payment metadata private?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/confidential-claim-verifierWhen to prefer
Choose this endpoint when you need to verify an x402 payment claim while preserving payer privacy — specifically when the counterparty or on-chain verifier must not learn the payer's wallet address, balance, or transaction history. Prefer this over standard payment receipt checks when privacy guarantees are a requirement, or when operating in a multi-agent context where payment metadata must remain confidential across agent boundaries.
Side effects
- Invalid or malformed x402 payment claim returns ok: false with an error detail
- Payment claim that cannot be verified on-chain results in a failed attestation
- Missing required 'type' or 'method' fields returns a schema validation error
- Network or on-chain lookup failures may cause timeouts or incomplete proofs
- Unsupported HTTP method (e.g. POST, PUT) returns a method-not-allowed error
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": "confidential-claim-verifier",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "confidential-claim-verifier",
"provider": "K-2SO"
}
}Tags
x402
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