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SignalHarness Address Validate
x402
SignalHarness Address Validate is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Validates a postal or shipping address and returns a structured validation result with warnings about potential issues
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing: an 'address_validation' field with the validation verdict, a 'warnings' array listing any detected issues (e.g. missing unit number, unrecognized city), an 'evidence_scope' indicating the data source used (caller_supplied_data), and a full payment receipt including network, paymentId, latencyMs, and a SHA-256 result hash for auditability.
Example use cases
E-commerce checkout address check
“Before I process this order, validate the shipping address the customer entered: '742 Evergreen Terrace, Springfield, IL 62704' — flag any warnings so I can ask them to correct it.”
CRM data quality cleanup
“I need to validate this address in our CRM before sending marketing mail: '55 Water St New York NY 10041' — tell me if it looks correct and note any issues.”
Logistics pre-shipment verification
“We're about to dispatch a parcel to '300 Boren Ave N, Seattle WA 98109' — can you verify that address is valid and deliverable before we print the label?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/address_validate/invokeWhen to prefer
Choose this endpoint when you need a quick, per-call address validation with a micro-payment model ($0.005 USDC) and no subscription required. It is especially useful for AI agents operating on the x402 payment protocol over the Base network, where each call is independently paid and receipted. Prefer it over geocoding APIs when the goal is deliverability validation rather than coordinate lookup, and over batch validation services when you need real-time single-address checks with an auditable on-chain receipt.
Side effects
- Empty or too-short address string (minLength 2) returns a validation error
- Malformed JSON request body causes a 400-level error
- Payment not attached or insufficient USDC amount causes a 402 Payment Required response
- Address string exceeding 65536 characters is rejected
- Ambiguous or completely fictional address may return warnings rather than a hard failure
- Network or settlement failure on Base (eip155:8453) may cause payment to not settle
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address_validation_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Format validation does not prove ownership, activity, or safety."
],
"service_id": "address_validate",
"evidence_scope": "caller_supplied_data",
"address_validation": "{\"kind\":\"evm\",\"normalized\":\"0x0000000000000000000000000000000000000001\",\"valid\":true}"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "address_validate",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "4fe9987a987fb6c70c30c808a20840f7b32688abb8c485a93a85cfb165146876",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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