FreeAgent

No OpenAPI. FreeAgent staff said in Sept 2026 that an OpenAPI 3 definition is in progress (https://api-discuss.freeagent.com/t/openapi-swagger-definition-for-freeagent-api/2815). HTML docs: https://dev.freeagent.com/docs.

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FreeAgent Postman collection

Verified

Format: Postman · 2.1.0
Source: Vendor
URL: https://raw.githubusercontent.com/fac/postman-freeagent-api-collection/master/FreeAgent.postman_collection.json
Server: https://api.freeagent.com/v2
Operations: 155
Last changed: 31 Oct 2026
sha256: 6bff9134e8412b6d… · 165 KB

Official (fac = FreeAgent GitHub org), referenced by FreeAgent staff as the closest thing to a spec. Repo has no licence and was last pushed 2022-08-03, so may be stale.