# FarOut Pay-Per-Call GPT-5.6 Chat Completions (Solana, x402)

> FarOut Pay-Per-Call GPT-5.6 Chat Completions (Solana, x402) is a paid API for AI agents from farouter.tech, paid per call via x402, $0.002014/call, status unknown (last checked 2026-09-13).

Runs a GPT-5.6 chat completion request billed per-call in USDC on Solana via the x402 payment protocol — no API key or account required.

## Facts

- Endpoint: POST https://farouter.tech/v1/metered/models/gpt-5.6-sol/chat/completions
- Price: $0.002014/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/farout-pay-per-call-gpt-5-6-chat-completions-solana-x402-9fd4b50b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NjWF89U9QlcVi5-chrl3S

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability farout-pay-per-call-gpt-5-6-chat-completions-solana-x402-9fd4b50b -d '<json body>'
```

Example prompt: Using FarOut's pay-per-call GPT-5.6 endpoint on Solana, send this conversation — system: 'You are a concise assistant', user: 'What is the capital of France?' — and pay the ~$0.002 USDC fee automatically from my Solana wallet.

## When to prefer this

Choose this endpoint when you need GPT-5.6 chat completions without an OpenAI account or API key, want true pay-per-call billing settled in USDC on Solana, or are building an autonomous agent that must pay for AI inference atomically via x402 without pre-purchasing credits. Prefer it over standard OpenAI API when avoiding subscription lock-in or when operating in a crypto-native payment environment.

## Known failure modes

- Payment insufficient or wallet balance too low — 402 response with exact price quote, request not charged
- Invalid or malformed messages array — 400 error returned
- Model temporarily unavailable — 503 or provider-side error
- Solana network congestion causing payment confirmation delay
- Max tokens exceeded for the model context window
- Request times out before completion — caller not charged per the no-charge-on-failure guarantee

## How this service works

Pay-per-call LLM inference over x402. Frontier models (GLM, GPT, Gemini, Kimi, DeepSeek, MiniMax) billed per request in USDC on Base or Solana mainnet. No API key, no account. The 402 quotes your exact request; failed calls are never charged.

## Output

Returns an OpenAI-compatible JSON response containing a choices array with the assistant message content and finish reason, plus a usage object showing prompt_tokens and completion_tokens consumed for the request.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "usage": {
   "prompt_tokens": 6,
   "completion_tokens": 8
  },
  "choices": [
   {
    "message": {
     "role": "assistant",
     "content": "Hello! How can I help?"
    },
    "finish_reason": "stop"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/farout-pay-per-call-gpt-5-6-chat-completions-solana-x402-9fd4b50b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from farouter.tech](https://www.zero.xyz/host/farouter.tech/llms.txt)