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UK Postcode Autocomplete
x402
UK Postcode Autocomplete is a paid API for AI agents from postcode-api-production.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Autocompletes a partial UK postcode string into a list of full postcode suggestions
Price / call$0.001
Success—
StatusUnknown
How this service works
Autocomplete a partial UK postcode into a list of full postcode suggestions.
Output
Returns a list of full UK postcode strings that match the supplied partial prefix, up to the requested limit (default 10, max 100). Each suggestion is a complete, valid UK postcode derived from the partial input.
Example use cases
Address form postcode typeahead
“I'm building an address entry form — as the user types 'EC1A', can you fetch up to 15 matching UK postcodes so I can show them a dropdown to pick from?”
Delivery zone postcode lookup
“I need to find all UK postcodes that start with 'M1' — can you return up to 50 suggestions so I can check which ones fall in our delivery zone?”
Location-aware app onboarding
“A user just typed 'BS1' in the postcode field of our app — can you autocomplete that into a list of up to 10 full UK postcodes they can choose from?”
Technical details
Endpoint
POSThttps://postcode-api-production.up.railway.app/lookup/autocompleteWhen to prefer
Use this endpoint when you need real-time postcode typeahead or autocomplete functionality — for example, powering a UI dropdown as a user types, or programmatically expanding a known partial postcode prefix into candidate full postcodes. Prefer this over the free-text address search sibling when you already have a partial postcode (not a place name or street address) and want clean, structured postcode-only results.
Side effects
- Empty or missing 'partial' field returns an error or empty results
- Limit outside 1-100 range is rejected
- Non-UK postcode format prefix may return no suggestions
- Network or service unavailability returns a 5xx error
- Payment failure via x402 prevents the response from being returned
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'. |
Tags
x402
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