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UK Postcode Validate
x402
UK Postcode Validate is a paid API for AI agents from postcode.payapi.market, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Validates a UK postcode and returns its active status, normalized form, and format correctness
Price / call$0.001
Success—
StatusUnknown
How this service works
UK postcode lookup, search, validation and autocomplete with x402 payments.
Output
A JSON object containing the input postcode, its normalized form (no spaces, uppercase), a boolean indicating whether it is active, whether the format is valid, and the postcode type (e.g. 'active').
Example use cases
E-commerce address form validation
“A customer just entered 'ec1a1bb' into the postcode field — can you check if that's a valid, active UK postcode before we accept their order?”
Data cleansing for mailing list
“I have the postcode 'W1A 0AX' in my database — can you verify it's correctly formatted and active so I know whether to include it in my mailing run?”
Onboarding form quality gate
“Our new user typed 'ZZ99 3CZ' as their postcode — is that a real, active UK postcode or should we flag it for manual review?”
Technical details
Endpoint
POSThttps://postcode.payapi.market/lookup/validate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to confirm that a UK postcode both has a valid format and is currently active — not just syntactically correct. Prefer this over a regex-only check when you need authoritative active/inactive status from a live data source. Ideal for form validation pipelines, address enrichment flows, or data quality gates on UK address data.
Side effects
- Missing or empty postcode field returns a validation error
- Non-UK postcode formats (e.g. US ZIP codes) will fail format validation
- Postcodes that are correctly formatted but no longer in use will return active: false
- Malformed JSON input may return a 400-level error
- Payment failure via x402 protocol will block the request from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| postcode | string | UK postcode to validate; spacing and case are normalised, e.g. 'SW1A 1AA'. |
Output
Schema · Response
{
"type": "json",
"example": {
"type": "active",
"input": "SW1A 1AA",
"active": true,
"normalized": "SW1A1AA",
"valid_format": true
}
}Tags
x402
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