Gzip compress

Compress a string with gzip (RFC 1952) and return it as base64. Send POST /api/gzip with the required field input and pay $0.001 per call over x402 or MPP, or call it free by solving a proof-of-work challenge. It returns a JSON object with algorithm, inputBytes, outputBytes, ratio and output.

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).

Category: Live public data · Tags: gzip compress zlib rfc1952 encoding

TRY IN PLAYGROUND →

Parameters

Example request

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"}'

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

Example response

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

From an MCP client

catalog.call {
  "slug": "gzip",
  "params": {
    "input": "hello hello hello hello hello hello hello",
    "inputFormat": "utf8"
  }
}

On the hosted connector at https://agent402.tools/mcp, catalog.call runs gzip free (rate-limited, no wallet). Local install: npx -y agent402-mcp.

Errors and behavior

• input 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 cancelled 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.
• Free tier: no outbound network call leaves the server for this tool, so proof-of-work (16 leading zero bits of sha256) pays for it.
• A GET or HEAD to /api/gzip 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?.(false); // keep your own spending ceiling in code
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

Fetch a challenge, solve the sha256 puzzle (16 leading zero bits, a fraction of a second of CPU), 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"}) });

Related tools