Image OCR

Extract text from an image (PNG/JPEG): returns the full text, overall confidence (0-100), and per-line bounding boxes. Send either {image: base64} or {url: 'https://…'}. Pure-CPU Tesseract via tesseract.js — no upstream API, no keys. Default lang 'eng'; pass 'lang' (ISO 639-2) for others.

Input

Field	Type	Description
image	string	Base64 PNG/JPEG (data: URL prefix accepted). Either this or url is required.
url	string	HTTPS URL to fetch the image from (max 8 MB). Either this or image is required.
lang	string	Language code, ISO 639-2. Default 'eng'. Supported: eng, spa, fra, deu, ita, por, nld, rus, pol, tur, chi_sim, chi_tra, jpn, kor, ara, hin, tha, vie, ukr, ell.

Example output

{
  "text": "Mild Splendour of the various-vested Night!\nMother of wildly-working visions! hail!",
  "confidence": 91.8,
  "lang": "eng",
  "lineCount": 2,
  "lines": [
    {
      "text": "Mild Splendour of the various-vested Night!",
      "confidence": 92.1,
      "bbox": {
        "x0": 24,
        "y0": 12,
        "x1": 658,
        "y1": 48
      }
    },
    {
      "text": "Mother of wildly-working visions! hail!",
      "confidence": 91.5,
      "bbox": {
        "x0": 24,
        "y0": 56,
        "x1": 612,
        "y1": 92
      }
    }
  ],
  "source": "tesseract.js (Tesseract WASM, Apache-2.0)"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/image-ocr \
  -H "Content-Type: application/json" \
  -d '{"url":"https://tesseract.projectnaptha.com/img/eng_bw.png"}'

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/api/image-ocr", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "url": "https://tesseract.projectnaptha.com/img/eng_bw.png"
  }),
});

No wallet? Pay with compute

This is a pure-CPU tool, so an agent without a wallet can pay with proof-of-work instead of USDC: fetch a challenge, solve the sha256 puzzle (16 leading zero bits — a fraction of a second of CPU, no money, no AI tokens), and resend with the X-Pow-Solution header.

import { createHash } from "node:crypto";
const lz = (b) => { let t = 0; for (const x of b) { if (!x) { t += 8; continue; } t += Math.clz32(x) - 24; break; } return t; };
const c = await (await fetch("https://agent402.tools/api/pow/challenge?slug=image-ocr")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/image-ocr", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"url":"https://tesseract.projectnaptha.com/img/eng_bw.png"}) });

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