LLM Gateway API

The LLM Gateway is the Agent Gateway's data path: it registers agent signing keys, stores attestation blobs, records agent state history, and verifies, governs, audits, and forwards agents' LLM provider and relay traffic.

Version: 1.2.1
Base URL: https://<host>

Authentication

AgentSignature · API key in header "Signature" — An RFC 9421 HTTP message signature by a registered agent's Ed25519 or P-256 key, sent with its Signature-Input header. The keyid is the agent's registered DID, created must fall within the signature's maximum age and clock skew, and the covered components start with @method and @target-uri. A request with a body also covers content-digest. Proxy and relay requests cover x-viper-nonce, x-viper-timestamp, and either x-viper-state-cid (state in an uploaded blob) or x-viper-credential-cid (state in the agent's state attestation credential); credential renewal covers x-viper-nonce. Viper signs every request this way.
ApiKeyAuth · API key in header "Authorization" — Type "Bearer" followed by a space and a Guardian Platform API key (ak_…). Accepted only for agent registration, when the gateway is configured to enroll agents through Auth Service. Registration with a registration token sends no Authorization header.

Health

getHealth check/health

Registration

postRenew agent verifiable credential/v1/agents/credentials/renew
postRegister agent signing key/v1/agents/registrations
getGet registration credential issuer/v1/agents/registrations/issuer
headGet registration credential issuer/v1/agents/registrations/issuer

Provider Proxy

getProxy LLM provider request/v1/anthropic_api/{path}
putProxy LLM provider request/v1/anthropic_api/{path}
postProxy LLM provider request/v1/anthropic_api/{path}
deleteProxy LLM provider request/v1/anthropic_api/{path}
patchProxy LLM provider request/v1/anthropic_api/{path}
getProxy LLM provider request/v1/chatgpt_backend/{path}
putProxy LLM provider request/v1/chatgpt_backend/{path}
postProxy LLM provider request/v1/chatgpt_backend/{path}
deleteProxy LLM provider request/v1/chatgpt_backend/{path}
patchProxy LLM provider request/v1/chatgpt_backend/{path}
getProxy LLM provider request/v1/openai_api/{path}
putProxy LLM provider request/v1/openai_api/{path}
postProxy LLM provider request/v1/openai_api/{path}
deleteProxy LLM provider request/v1/openai_api/{path}
patchProxy LLM provider request/v1/openai_api/{path}

Blobs

putUpload blob/v1/blobs/{cid}

Relay

getRelay request/v1/relay
putRelay request/v1/relay
postRelay request/v1/relay
deleteRelay request/v1/relay
patchRelay request/v1/relay