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RunOnProof UK Companies House Entity Resolver
x402
RunOnProof UK Companies House Entity Resolver is a paid API for AI agents from cdo-production.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Resolves a UK company's identity using Companies House data given a company number or legal name, returning candidate matches or a REVIEW flag on ambiguity.
Price / call$0.01
Success—
StatusUnknown
How this service works
Resolve a UK Companies House entity before onboarding or contracting. Use a company number, or a legal name with optional postcode, to obtain source-scoped identity candidates. Ambiguity returns REVIEW; it does not imply good standing.
Output
Returns one or more identity candidate records sourced from Companies House, each containing registered company details scoped to the Companies House source. If the name/postcode combination is ambiguous, the response includes a REVIEW status rather than a definitive match. A unique company number query typically returns a single resolved record.
Example use cases
Supplier onboarding identity check
“We're about to onboard a new UK supplier called 'Greenfield Engineering Ltd' based in Manchester — can you pull their Companies House identity record using their name and postcode M1 2AB to make sure we have the right legal entity before we sign anything?”
Contract counterparty verification
“Before we finalise this contract, can you look up the UK company with Companies House number 03977902 and confirm the registered legal name and identity details?”
Resolving ambiguous company name
“I need to identify the correct registered company behind 'Atlas Holdings' in the UK — there might be more than one, so please search by name and postcode EC2A 4NE and let me know if it comes back as ambiguous.”
Technical details
Endpoint
POSThttps://cdo-production.up.railway.app/v1/gb/entities/resolveWhen to prefer
Use this endpoint when you need to resolve the legal identity of a UK-registered company prior to onboarding, contracting, or payment — especially when you have a company number or a legal name with a postcode. Prefer this over general web search when you need authoritative Companies House source-scoped identity data with structured candidate output and ambiguity signalling.
Side effects
- Ambiguous name returns REVIEW status rather than a single resolved entity — caller must refine search or use company number
- Invalid company number format rejected by schema validation
- No matching entity found for the given name or number
- Service unavailable or upstream Companies House API timeout
- Idempotency key mismatch if header and body values differ
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| postal_code | string | |
| company_name | string | |
| company_number | string | Companies House company number, including any two-letter prefix when applicable. |
| idempotency_key | string | Caller-generated key. Send the identical value in the Idempotency-Key header. |
Tags
x402
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