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UK Postcode Autocomplete API
x402
UK Postcode Autocomplete 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).
Returns a list of matching UK postcode suggestions given a partial postcode string
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 original partial postcode, a count of suggestions returned, and an array of matching full UK postcode strings (e.g. ['SW1A 0AA', 'SW1A 1AA', 'SW1A 2AA'])
Example use cases
Address form postcode typeahead
“As the user types 'EC1A' into the postcode field on our checkout form, give me up to 20 matching UK postcode suggestions to show in the dropdown.”
Validate and complete a partial postcode
“The user entered 'W1F' as their postcode — can you return up to 5 full UK postcodes that start with that prefix so they can pick the right one?”
Postcode lookup for delivery routing
“I need a list of all UK postcodes beginning with 'M1' — return up to 50 suggestions so I can let the driver pick the correct delivery area.”
Technical details
Endpoint
POSThttps://postcode.payapi.market/lookup/autocomplete?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time UK postcode autocompletion or typeahead suggestions from a partial prefix — ideal for building address forms, validating user input incrementally, or helping users narrow down a correct UK postcode without knowing the full code.
Side effects
- Empty or missing 'partial' field returns no suggestions or an error
- Limit outside 1–100 range is rejected or clamped
- Non-UK postcode prefixes return zero suggestions
- Payment failure via x402 results in 402 response and no data returned
- Very broad partial (e.g. single letter) may return truncated results at the limit
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | integer | Maximum number of suggestions to return (1-100, default 10). |
| partial | string | Partial UK postcode to autocomplete, e.g. 'SW1A'. |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 3,
"partial": "SW1A",
"suggestions": [
"SW1A 0AA",
"SW1A 1AA",
"SW1A 2AA"
]
}
}Tags
x402
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