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UK Postcode Lookup API
x402
UK Postcode Lookup API 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).
Looks up detailed geographic and administrative data for a given UK postcode, including coordinates, ward, district, region, and constituency.
Price / call$0.001
Success—
StatusUnknown
How this service works
UK postcode lookup, search, validation and autocomplete with x402 payments.
Output
Returns a JSON object with a 'found' boolean, the normalised input postcode, and a 'result' object containing full geographic and administrative data: latitude, longitude, outcode, incode, region, country, admin ward, admin district, admin county, parish, parliamentary constituency, European electoral region, NHS CCG, primary care trust, LSOA, MSOA, NUTS area, date of introduction, and corresponding ONS/GSS codes for administrative entities.
Example use cases
Delivery address validation for e-commerce
“I have a customer order shipping to postcode EC1A 1BB — can you check if that's a valid UK postcode and get its region and district so I can route it correctly?”
Constituency mapping for political canvassing
“We're targeting voters in the W1A 1AA postcode — can you tell me which parliamentary constituency that falls under?”
Location enrichment for analytics pipeline
“I have a list of user postcodes starting with M1 1AE — can you resolve that postcode to get its latitude, longitude, LSOA code, and NHS CCG so I can enrich my dataset?”
Technical details
Endpoint
POSThttps://postcode.payapi.market/lookup/postcode?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need comprehensive UK postcode resolution including both geographic coordinates and administrative boundary codes (ward, district, constituency, NHS CCG, LSOA/MSOA) in a single call. It is ideal for address enrichment pipelines, compliance checks requiring ONS codes, delivery routing, or political/health analytics where both location and administrative context are needed. Prefer it over raw geocoding APIs when the input is specifically a UK postcode and you need structured administrative metadata alongside coordinates.
Side effects
- Postcode not found: returns found=false with no result object
- Invalid postcode format: may return an error or found=false if the postcode cannot be normalised
- Payment failure: x402 payment not authorised, request rejected before processing
- Network timeout: upstream geocoding service unavailable
- Terminated postcode: postcode existed historically but has been retired, returns not found
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| postcode | string | UK postcode to look up; spacing and case are normalised, e.g. 'SW1A 1AA'. |
Output
Schema · Response
{
"type": "json",
"example": {
"found": true,
"input": "SW1A 1AA",
"result": {
"ccg": "NHS North West London",
"lsoa": "Westminster 018C",
"msoa": "Westminster 018",
"nuts": "Westminster",
"codes": {
"admin_ward": "E05013806",
"admin_district": "E09000033"
},
"incode": "1AA",
"parish": "Westminster, unparished area",
"region": "London",
"country": "England",
"outcode": "SW1A",
"quality": 1,
"latitude": 51.501009,
"postcode": "SW1A 1AA",
"longitude": -0.141588,
"admin_ward": "St James's",
"admin_county": null,
"admin_district": "Westminster",
"primary_care_trust": "Westminster",
"date_of_introduction": "198001",
"european_electoral_region": "London",
"parliamentary_constituency": "Cities of London and Westminster"
}
}
}Tags
x402
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