Gzip compress

Compress a string with gzip (RFC 1952) and return it as base64. Reports input bytes, output bytes, and the compression ratio so you can decide if it was worth doing. Input can be plain text (utf8) or already-binary content (base64 or hex).

Input

Field	Type	Description
input *	string	Content to compress (max 10MB after decoding)
inputFormat	string	How `input` is encoded: utf8 (default), base64, or hex
level	number	Compression level 1-9 (default 9 = best ratio, slower)

Example output

{
  "algorithm": "gzip",
  "inputBytes": 41,
  "outputBytes": 21,
  "ratio": 0.4878,
  "output": "H4sIAA…"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/gzip \
  -H "Content-Type: application/json" \
  -d '{"input":"hello hello hello hello hello hello hello","inputFormat":"utf8"}'

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/gzip", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "input": "hello hello hello hello hello hello hello",
    "inputFormat": "utf8"
  }),
});

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=gzip")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/gzip", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"input":"hello hello hello hello hello hello hello","inputFormat":"utf8"}) });

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