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Agent Payment Payee-Address Verification Against Address Poisoning
x402
Agent Payment Payee-Address Verification Against Address Poisoning is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).
Returns a decision procedure (prose brief) for verifying a crypto payee address against address-poisoning attacks before an agent payment settles
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for verifying a payee address before any agent payment settles. Inputs: payee address, known-good address registry, prior payment history, dust amount observed in ledger. Steps: 1. Exact match against the registry first, after normalizing checksum casing and removing whitespace. 2. If no exact match, flag the address and run lookalike checks: edit distance under 4, repeated characters (0/O, l/1, o/0), identical first 4 and last 4 characters, and any address that appears in a
Output
A JSON object containing a plain-prose decision procedure (120+ words) describing the verification steps and outcome, along with metadata including the model used, generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and the service slug. The 'brief' and 'procedure' fields contain the actionable text for the agent.
Example use cases
Pre-settlement address poisoning check
“We're about to send 500 USDC to 0xaB3f...9E12 — can you run a full address poisoning verification against our known-good registry and flag any lookalike issues like repeated 0/O characters or matching first and last 4 digits before the payment goes through?”
Dust attack detection for agent wallet
“Our agent wallet received a small dust amount from an unknown address 0xAbCd...1234 that looks similar to one of our regular payees — verify whether this is an address poisoning attempt using the decision procedure.”
Automated payment safety gate
“Set up a verification step in our payment pipeline: before any outgoing transaction settles, screen the recipient address against our registry for edit distance lookalikes, character substitutions like l/1 or O/0, and identical prefix/suffix patterns, then return the full decision procedure.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-payment-payee-address-verification-againstWhen to prefer
Use this endpoint when an AI agent is about to settle a crypto payment and needs a structured, deterministic decision procedure to detect address-poisoning attacks — especially when the payee address is new, appeared after a dust transaction, or closely resembles a known-good address. Prefer this over generic address-format validators when you need lookalike character analysis (0/O, l/1), edit-distance checks, and registry matching in one call within an x402 payment pipeline.
Side effects
- Payment required (402) if no valid x402 payment header is provided
- Address not found in registry — flagged for manual review
- Malformed or non-normalized address input causes validation error
- Registry unavailable — procedure falls back to heuristic-only checks
- Topic override not recognized — defaults to standard procedure
- Rate limiting or upstream LLM failure may delay or prevent generation
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-payment-payee-address-verification-against",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-payment-payee-address-verification-against",
"provider": "K-2SO"
}
}Tags
x402
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