Image edit (OpenAI-compatible)

Edit an image with a prompt over x402 - OpenAI images.edit wire (reference images and a prompt in, inline base64 out) at $0.02 per picture. Send POST /v1/images/edits with the required fields prompt and image and pay $0.02 per call over x402 with USDC on an EVM chain or MPP. It returns a JSON object with created, model, data and usage.

Send one to 4 PNG or JPEG reference images (256 px a side or more, up to 6 MB each) as base64 or data: URLs in JSON, or one as a multipart "image" file; the output is one JPEG of about one megapixel that follows the first reference's aspect ratio. Served by FLUX 3 Image Klein in about 10 seconds. No mask: describe the change in the prompt. n locked to 1; a failed generation is not charged on x402. Point any OpenAI SDK's images.edit() at base_url https://agent402.tools/v1.

Try in playground →

Parameters

Example request

curl -i -X POST https://agent402.tools/v1/images/edits \
  -H "Content-Type: application/json" \
  -d '{"prompt":"Turn the red square into a ripe red apple with a soft shadow","image":"data:image/png;base64,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"}'

Without payment this returns HTTP 402 Payment Required with the exact price for v1-images-edit; any x402 v2 or MPP client pays it and retries.

Example response

{
  "created": 1750000000,
  "model": "black-forest-labs/flux-3-image-klein",
  "data": [
    {
      "b64_json": "/9j/4AAQSkZJRgABAQAAAQABAAD…",
      "media_type": "image/jpeg"
    }
  ],
  "usage": {
    "prompt_tokens": 11,
    "completion_tokens": 4096,
    "total_tokens": 4107
  }
}

From an MCP client

catalog.call {
  "slug": "v1-images-edit",
  "params": {
    "prompt": "Turn the red square into a ripe red apple with a soft shadow",
    "image": "data:image/png;base64,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"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for v1-images-edit; the stdio package pays it from a wallet or from an AGENT402_CREDITS_KEY issued earlier. Local install: npx -y agent402-mcp.

Errors and behavior

• prompt and image are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails.
• Wallet-only: this tool runs a model, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• Model-backed: the answer is generated by a model, so the same input can produce a different result.
• Long-running: payment settles after the work finishes, so x402 is offered on EVM chains only and MPP on Base or Celo; Tempo is not offered.
• A GET or HEAD to /v1/images/edits returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB and a streamed response are not replayed).

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();
client.setSpendControls?.({ maxAmountPerPayment: "$0.02" }); // refuse any quote above this tool's price
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/v1/images/edits", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "prompt": "Turn the red square into a ripe red apple with a soft shadow",
    "image": "data:image/png;base64,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"
  }),
});

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