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The x402 Inference API exposes Dolphin AI chat completions behind an x402 paywall. There are no API keys and no subscriptions — each chat request is paid for with a single USDC micropayment, authorized by a wallet signature.

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Base URL

The inference API is served by the Meridian facilitator:

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Endpoints

Chat Completion

POST /v1/inference/chat — paid, streams SSE

List Models

GET /v1/inference/models — free

List Templates

GET /v1/inference/templates — free

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How payment works

POST /v1/inference/chat is protected by the standard x402 flow:
  1. Call the endpoint with no payment — you receive 402 Payment Required with the accepted payment options (price, network, asset, receiver).
  2. Sign an EIP-3009 TransferWithAuthorization for the quoted amount (a gasless signature — no transaction, no gas needed).
  3. Retry the same request with the signed payment base64-encoded in the X-PAYMENT header.
  4. The server verifies and settles the payment through the Meridian facilitator, then streams the completion.
Any x402 client handles this automatically — see Programmatic API Access for x402-fetch / x402-axios examples that work against this API unchanged.

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Models

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Templates

Models and templates are sourced live from the upstream provider — always fetch the current lists from GET /v1/inference/models and GET /v1/inference/templates rather than hardcoding them.