Fast image generation (OpenAI-compatible, budget)

Budget text-to-image over x402 - OpenAI images wire (prompt in, inline base64 out) at $0.02 per picture, a quarter of the flagship /v1/images/generations price. Served by FLUX.2 Klein 4B (about 2 seconds per image, 1024x1024 JPEG) with GPT Image 1 Mini as the failover. n locked to 1, text-to-image only, size and quality fixed. Point any OpenAI SDK's images.generate() at base_url https://agent402.tools/v1 and call /images/fast.

TRY IN PLAYGROUND →

Input

Example output

{
  "created": 1750000000,
  "model": "black-forest-labs/flux.2-klein-4b",
  "data": [
    {
      "b64_json": "/9j/4AAQSkZJRgABAQAAAQABAAD…",
      "media_type": "image/jpeg"
    }
  ],
  "usage": {
    "prompt_tokens": 11,
    "completion_tokens": 4096,
    "total_tokens": 4107
  }
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/v1/images/fast \
  -H "Content-Type: application/json" \
  -d '{"prompt":"A minimalist line drawing of a lighthouse at dawn"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/v1/images/fast", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "prompt": "A minimalist line drawing of a lighthouse at dawn"
  }),
});

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