Token Endpoint

Overview

A token endpoint is an OAuth authorization-server route where a client exchanges an approved grant or credential for access and related tokens. Unlike a general API Token, a Token Endpoint is used to issue or exchange credentials through a defined protocol operation; for example, it works by validating the client and grant before returning bounded token state.

Depending on the grant type, the client sends an authorization code, refresh token, client credentials, or another supported assertion. The endpoint authenticates the client when required and returns token type, scope, lifetime, and optional refresh information. The production contract for Token Endpoint should state the supported networks, assets, contracts, addresses, transactions, balances, prices, confirmations, and finality rules, required and optional fields, types and units, validation rules, state preconditions, version, permissions, limits, errors, and compatibility guarantees.

Clients should use TLS, validate the authorization server, protect credentials, follow the exact grant contract, and store tokens securely. Servers need strict redirect and grant binding, short lifetimes, replay defenses, rate controls, key rotation, and auditable issuance. Error responses should not reveal secrets or help attackers enumerate valid grants. A compromise response for Token Endpoint should support rapid revocation, replacement, affected-client identification, and review of prior use.

An audit trail for Token Endpoint should link the contract and client version, principal, request identifier, sanitized payload evidence, response, callbacks, retries, overrides, provider references, and final state. Sending them to the wrong host, logging request bodies, weak client authentication, code replay, or missing PKCE can expose protected resources. Monitoring for Token Endpoint should track failed use, unusual scope or audience, expiry, rotation status, and attempts involving revoked credentials.