generated: '2026-08-29'
method: searched
source: >-
  https://docs.supra.com/oracles/apis-real-time-and-historical-data/rest-api and
  https://docs.supra.com/oracles/apis-real-time-and-historical-data/websocket-api for the price feeds key;
  openapi/supra-rpc-node-openapi.yml (served by rpc-mainnet.supra.com/docs/api.json) for the node API, which
  declares no components.securitySchemes and no top-level security requirement; verified against a live keyless
  call to https://rpc-mainnet.supra.com/rpc/v1/transactions/chain_id (HTTP 200, returned "8") on 2026-08-29.
description: >-
  Supra runs two authentication regimes side by side. The Layer 1 node RPC is fully public and keyless — no API
  key, no OAuth, no securityScheme in the OpenAPI at all — because authority on a blockchain comes from the
  signature inside the transaction payload, not from a credential on the HTTP call. The oracle Price Feeds REST
  and WebSocket APIs are the opposite: an x-api-key header is mandatory, and the key is issued by hand through a
  Google Form request, with the surface labelled Early Access.
schemes:
- id: none
  type: none
  applies_to: Supra RPC Node API (https://rpc-mainnet.supra.com, https://rpc-testnet.supra.com)
  in: n/a
  description: >-
    No credential is required for any of the 56 operations. Reads are open. Writes (submit_txn_v3,
    submit_txn) carry a signed transaction in the request body; the Ed25519 / multi-agent signature inside
    SignedTransaction is the authorization, and the node verifies it against the sender's on-chain
    authentication key and sequence number. There is no server-side account to authenticate to.
  evidence:
    probe: https://rpc-mainnet.supra.com/rpc/v1/transactions/chain_id
    status: 200
    openapi_security_schemes: []
  optional_node_operator_auth:
    surface: GET /rpc/v4/ws
    mechanism: Authorization Bearer token
    description: >-
      Per the OpenAPI description of the WebSocket upgrade operation, "When the node configures
      websocket_auth_tokens, clients must send Authorization: Bearer <token>. Connection and subscription limits
      are enforced per token." This is a per-node-operator configuration, not a Supra-issued credential, and the
      public mainnet endpoint does not require it.
- id: price-feeds-api-key
  type: apiKey
  applies_to: >-
    Supra Price Feeds REST API (https://prod-kline-rest.supra.com) and Supra Price Feeds WebSocket API
    (wss://prod-kline-ws.supra.com)
  in: header
  name: x-api-key
  description: >-
    Static API key sent on every request and on the WebSocket handshake. Missing key returns HTTP 401 with the
    JSON body {"error":"API key is missing"} — confirmed by probing https://prod-kline-rest.supra.com/latest
    unauthenticated on 2026-08-29.
  key_issuance: >-
    Manual. The docs link a Google Form request ("Please request your key here") rather than a self-serve
    developer console; there is no signup, dashboard, or key-rotation UI documented.
  signup: https://docs.google.com/forms/d/e/1FAIpQLSfHZr8BHLTY8q_MjbuKZPpdgQS0oGmRIrsn9H-HrieH9eQjFw/viewform
  docs: https://docs.supra.com/oracles/apis-real-time-and-historical-data/rest-api
  evidence:
    probe: https://prod-kline-rest.supra.com/latest
    status: 401
    body: '{"error":"API key is missing"}'
  status: Early Access — the docs state "Supra APIs are currently available in Early Access mode".
oauth2: false
openid_connect: false
mutual_tls: false
notes:
- >-
  No OAuth 2.0 or OpenID Connect anywhere: /.well-known/oauth-authorization-server and
  /.well-known/openid-configuration return 404 on all five probed hosts (see well-known/supra-well-known.yml),
  so scopes/ is not applicable for this provider.
- >-
  Wallet-level authentication for end users is handled by StarKey, Supra's first-party self-custodial wallet,
  and is a client-side signing concern rather than an API credential.