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FarOut Pay-Per-Call LLM Inference via x402 (GPT-5.3-Codex)
x402
FarOut Pay-Per-Call LLM Inference via x402 (GPT-5.3-Codex) is a paid API for AI agents from farouter.tech, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Runs a GPT-5.3-Codex chat completion request billed per-call in USDC via the x402 payment protocol, with no API key or account required.
Price / call$0.001
Success—
StatusUnknown
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
A JSON object containing the assistant's reply text under choices[0].message.content, finish_reason (e.g. 'stop'), and a usage object with prompt_tokens and completion_tokens counts. The response mirrors the OpenAI Chat Completions API format.
Example use cases
Autonomous agent calling LLM without API key
“I'm building an autonomous agent that needs to call a frontier LLM for reasoning steps, but I don't want to manage API keys — can you use FarOut to send a GPT-5.3-Codex chat completion request, paying per call from my Base USDC wallet, with the system prompt 'You are a helpful coding assistant' and user message 'Explain async/await in JavaScript in 3 bullet points'?”
One-off code generation with crypto micropayment
“Without signing up for anything, generate a SQL query that finds duplicate emails in a users table — use the FarOut pay-per-call service with GPT-5.3-Codex, charged to my Solana USDC wallet, just this one request.”
AI text generation for content pipeline
“For my content pipeline, call FarOut's GPT-5.3-Codex endpoint and ask it to write a compelling 3-sentence product description for a noise-cancelling travel pillow — pay the micro-fee in USDC on Base and return the generated text.”
Technical details
Endpoint
POSThttps://farouter.tech/v1/metered/models/gpt-5.3-codex/chat/completionsWhen to prefer
Choose this endpoint when you need LLM inference without account registration or API key management, want strict pay-per-call billing in USDC to avoid subscription overhead, or are building an agent that must self-fund AI calls via blockchain micropayments. Prefer it over traditional OpenAI direct access when operating in a trustless or anonymous context, or when using x402-compatible payment infrastructure on Base or Solana.
Side effects
- 402 Payment Required if wallet has insufficient USDC balance
- Payment rejected if x402 handshake fails or blockchain confirmation times out
- Model unavailable or rate-limited upstream at the provider level
- Malformed request body (missing 'messages' field) returns 400
- Network timeout if the inference call exceeds latency limits
Output
Schema · Response
{
"type": "json",
"example": {
"usage": {
"prompt_tokens": 6,
"completion_tokens": 8
},
"choices": [
{
"message": {
"role": "assistant",
"content": "Hello! How can I help?"
},
"finish_reason": "stop"
}
]
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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