HTML meta (from string)

FREE with proof-of-work · or $0.001 in USDC · POST /api/html-meta

Extract <title>, <meta description>, OpenGraph/Twitter cards, canonical URL, and JSON-LD blocks from an HTML string. Distinct from /api/meta which fetches a URL — feed this the HTML you already have (from /api/render, /api/extract.body, or your own fetch).

Input

Field	Type	Description
`html` *	string	Raw HTML string to inspect (max 5MB)

Example output

{
  "title": "Hi",
  "description": "x",
  "og": {
    "title": "Hi OG"
  },
  "twitter": {},
  "canonical": null,
  "jsonLd": []
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/html-meta \
  -H "Content-Type: application/json" \
  -d '{"html":"<html><head><title>Hi</title><meta name=\"description\" content=\"x\"><meta property=\"og:title\" content=\"Hi OG\"></head><body></body></html>"}'

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/html-meta", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "html": "<html><head><title>Hi</title><meta name=\"description\" content=\"x\"><meta property=\"og:title\" content=\"Hi OG\"></head><body></body></html>"
  }),
});

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

Part of these workflows

This tool is one step in a curated multi-tool workflow — agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

Structured scrape — Pull structured data out of any web page deterministically — articles to clean text, tables to JSON rows, specific elements via CSS selector — without writing regex against raw HTML.

HTML meta (from string)

Input

Example output

Try it — see the 402 challenge (free)

Paid call (JavaScript agent)

No wallet? Pay with compute

Part of these workflows

Related tools

Extract article

Page metadata

Browser render