Images to PDF

Combine PNG/JPEG images into a single PDF, one image per page. Send POST /api/images-to-pdf with the required field urls and pay $0.004 per call over x402 or MPP (there is no free tier). It returns a JSON object with pages, bytes and pdfBase64.

Body: {"urls":["https://…/1.png","https://…/2.jpg"]}. Returns the PDF as base64.

Try in playground →

Parameters

Example request

curl -i -X POST https://agent402.tools/api/images-to-pdf \
  -H "Content-Type: application/json" \
  -d '{"urls":["https://agent402.tools/fixtures/sample-image.png","https://agent402.tools/fixtures/sample-image.png"]}'

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

Example response

{
  "pages": 2,
  "bytes": 16753,
  "pdfBase64": "JVBERi0xLjcK…"
}

From an MCP client

catalog.call {
  "slug": "images-to-pdf",
  "params": {
    "urls": [
      "https://agent402.tools/fixtures/sample-image.png",
      "https://agent402.tools/fixtures/sample-image.png"
    ]
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for images-to-pdf; 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

• urls is 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 canceled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/images-to-pdf 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 is 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: "$0.004" }); // 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/api/images-to-pdf", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "urls": [
      "https://agent402.tools/fixtures/sample-image.png",
      "https://agent402.tools/fixtures/sample-image.png"
    ]
  }),
});

Part of these workflows

Images to PDF is one step in this skill pack, each sold as a single call:

• Document intelligence - Turn any PDF or image URL into structured data - metadata, extracted text, sliced page ranges, OCR for scanned docs, decoded barcodes / QR codes - without falling back to a vision LLM guess. Built for the messy 30% of documents where pdf-to-markdown alone returns nothing useful.

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