# x402 Mesh Inference

> Pay-per-prompt OpenAI-compatible chat completions routed across a mesh of independent GPU nodes, settled in USDC on Algorand via x402.

## Endpoint

    POST https://x402-mesh-gateway.fly.dev/v1/chat/completions

Request and response bodies are OpenAI-compatible. Set `"stream": true` for a
`text/event-stream` response terminated by the literal frame `data: [DONE]`.

## Paying

Call /v1/chat/completions without a payment header to receive `402 Payment Required`,
whose `accepts` array carries the exact requirements. Pay with an x402 client
configured for the Algorand `exact` scheme; the facilitator sponsors the ALGO fee, so
you sign only the USDC transfer. Your account must be opted in to the USDC ASA.

## Example

```json
{
  "model": "llama3.1:8b",
  "messages": [
    {
      "role": "system",
      "content": "You are a concise assistant."
    },
    {
      "role": "user",
      "content": "Summarise the x402 payment protocol in one sentence."
    }
  ],
  "max_tokens": 128,
  "temperature": 0.2,
  "stream": false
}
```

## Live configuration

These values are read from the running gateway at request time and override anything
above if they differ.

- endpoint: https://x402-mesh-gateway.fly.dev/v1/chat/completions
- price: $0.0020 USDC per request (2000 atomic units, 6 decimals)
- pricing: per-model; the price above applies to any model not listed below
  - llama-3.3-70b-versatile: $0.0060 USDC
- network: algorand:SGO1GKSzyE7IEPItTxCByw9x8FmnrCDe (testnet)
- asset: USDC ASA 10458941
- payTo: R5UN7S5G3AMKBDFEB42E7LSUT7JJGGZ6HL2S74ULBBZ36GWZVHEHJ53AOY
- scheme: exact
- facilitator: https://facilitator.goplausible.xyz
- maxTimeoutSeconds: 180
- tags: x402-global-challenge, ai-inference, llm, openai-compatible, algorand
- discovery: https://x402-mesh-gateway.fly.dev/.well-known/x402
- pricing: https://x402-mesh-gateway.fly.dev/v1/pricing
- quickstart: https://x402-mesh-gateway.fly.dev/quickstart (runnable client, no wallet needed to read)
- nodes: https://x402-mesh-gateway.fly.dev/v1/nodes
- settlements: https://x402-mesh-gateway.fly.dev/v1/settlements