Todyl External API
Todyl's External API is a path-versioned REST API served from https://api.todyl.com. Probing it unauthenticated returns Todyl's own JSON error envelope ({"error":{"code":"auth_missing_token","message":"Credentials missing or invalid.","request_id":"req_..."}}), and supplying the X-Todyl-Client-Id / X-Todyl-Access-Token header pair changes the code to auth_malformed_token, confirming those are the credential headers the service recognises. Tokens are minted in the Todyl portal under Account -> Developer APIs -> External API Tokens. Every path probed — including /openapi.json, /v1/openapi.json and /.well-known/* — answers 401, so no machine-readable contract is reachable without credentials.