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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-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-23).
Returns a decision procedure brief helping AI agents evaluate whether a proposed x402 payment is safe to approve, covering fake merchant endpoints, swarm micro-transaction fraud, and TOCTOU attack vectors.
Price / call$0.002
Success—
StatusUnknown
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 structured brief containing a prose decision procedure (brief field), the topic assessed, generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and a boolean indicating handler success — giving the agent actionable guidance on whether to approve, reject, or re-quote the payment.
Example use cases
Fake merchant endpoint detection
“I just got an x402 payment request from a merchant I've never seen before — the domain looks fresh and the payTo address seems off. Can you triage this payment for fake merchant signals before I approve it?”
Swarm micro-transaction fraud check
“My agent has received several tiny x402 charges from the same merchant identity in the last few minutes for what should be a single request. Run a scam triage to see if this looks like spend velocity abuse or intent-splitting fraud.”
TOCTOU quote-to-settlement verification
“I want to make sure the x402 payment quote I received is still valid and hasn't been tampered with between when I got it and when I'm about to sign — can you run the TOCTOU triage procedure on this?”
Technical details
Endpoint
GEThttps://k2so-8080.on.ascii.dev/api/services/x402-payment-scam-surface-triage-for-autonomous?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent is operating in an x402-native payment flow and needs a structured, authoritative decision procedure before approving any payment — especially when encountering unknown merchants, unusually high call frequency from one merchant, or when quote and settlement URLs may differ. Prefer over generic fraud heuristics because this procedure is purpose-built for x402 attack classes specific to autonomous agent payment flows.
Side effects
- Payment required but not provided — returns 402 with payment instructions
- Invalid method (POST/PUT not supported) — only GET/HEAD/DELETE allowed
- Topic override not recognized — falls back to default x402 triage procedure
- Service temporarily unavailable — provider infrastructure outage
- Malformed query parameters — ignored or returns default behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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