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x402 Payment Scam Surface Triage for Autonomous Agents
x402
x402 Payment Scam Surface Triage for Autonomous Agents is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-11-01).
Returns a structured decision procedure helping autonomous agents detect and avoid payment scams when processing x402 micropayments, covering fake merchants, swarm micro-transaction fraud, and TOCTOU attacks.
Price / call$0.002
Success—
StatusDown
How this service works
Decision procedure for an agent deciding whether a proposed x402 payment is safe to approve. Covers three attack classes in order: fake merchant endpoints (fresh domain, no receipt schema, mismatched payTo address, challenge URL differs from quoted URL), swarm micro-transaction fraud (many tiny charges from one merchant identity, spend velocity above policy threshold, one merchant splitting a single intent into repeated quotes), and TOCTOU between quote and settlement (re-quote before signing,
Output
A JSON object containing a decision procedure brief (prose guidance for the agent), a boolean success flag, payment metadata, a service slug, provider identifier, generation source (llm, reasoning, or deterministic), and an ISO-8601 timestamp of generation. The 'brief' field is the core actionable text describing the triage outcome and recommended action.
Example use cases
Pre-approval safety gate for x402 quotes
“I'm about to approve an x402 payment from a merchant I haven't used before — can you run the scam triage procedure to check for fake merchant signals like a fresh domain, mismatched payTo address, or a challenge URL that doesn't match what was quoted?”
Swarm micro-charge fraud detection
“My agent has received 12 tiny x402 charges from the same merchant identity in the last hour, all under $0.01 — can you run the spend velocity and swarm micro-transaction fraud check to tell me if this looks like one intent being split into repeated quotes?”
TOCTOU attack prevention before signing
“I got an x402 quote but I want to re-quote right before signing to make sure the terms haven't changed — walk me through the TOCTOU triage procedure so I know whether it's safe to proceed with settlement.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/x402-payment-scam-surface-triage-for-autonomous?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent needs structured, actionable fraud-detection guidance specific to x402 payment flows before approving a payment. It is purpose-built for the three most common x402 attack surfaces (fake merchants, swarm micro-charges, TOCTOU), making it more targeted than generic fraud detection APIs. Prefer it over manual rule checks when the agent lacks built-in x402 security heuristics or needs an auditable, LLM-generated decision procedure it can log alongside a transaction.
Side effects
- Missing required 'type' or 'method' fields returns a validation error
- Invalid method values outside GET/HEAD/DELETE are rejected
- Service unavailability or upstream LLM failure may return non-200 responses
- Topic override may produce off-target procedure if unrelated to x402 payment security
- Free metadata mode (meta=1) returns schema only, not a full triage result
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": "x402-payment-scam-surface-triage-for-autonomous",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "x402-payment-scam-surface-triage-for-autonomous",
"provider": "K-2SO"
}
}Tags
x402
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