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Chat Completions

by FarOut LLM Gateway in AI models & inference

x402 APIPassing, checked 1 h ago

Fixed-price chat completions for gpt-5.5 on FarOut: flat $0.002 per call (includes up to 4,000 input + 1,000 output tokens). Rate: $0.020/1M input tokens, $0.120/1M output tokens. Pay with USDC on Base using x402. No API key, no account, no prepaid balance.

POST https://farouter.tech/v1/models/gpt-5.5/chat/completions

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
21.4%
Response time
507 ms typical, 507 ms slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://farouter.tech/v1/models/gpt-5.5/chat/completions" \
  -H "content-type: application/json" \
  -d '{"max_tokens":50,"messages":[{"content":"hi","role":"user"}],"model":"gpt-5.5"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ffarouter.tech%2Fv1%2Fmodels%2Fgpt-5.5%2Fchat%2Fcompletions
const res = await pay("https://farouter.tech/v1/models/gpt-5.5/chat/completions", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"max_tokens":50,"messages":[{"content":"hi","role":"user"}],"model":"gpt-5.5"}),
});
console.log(await res.json());

Example input

{
  "max_tokens": 50,
  "messages": [
    {
      "content": "hi",
      "role": "user"
    }
  ],
  "model": "gpt-5.5"
}

Example output

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

Security scan

  • Charges more than its listed price in payment
    Listed at $0.002, charges $0.004

Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402662 ms$0.004
5 h agoPassed402473 ms$0.004
9 h agoPassed402507 ms$0.003
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History

13 Oct 2026Price changed from $0.003 to $0.004
13 Oct 2026Price changed from $0.002 to $0.003