HTML table to JSON/CSV

Extract a <table> from an HTML string as JSON rows (header-keyed) or CSV. Send POST /api/html-table with the required field html 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 rows, headers, format and count.

Useful for prices, schedules, sports stats, or anything an agent has already fetched as HTML. If multiple tables match, the first is used.

Try in playground →

Parameters

Example request

curl -i -X POST https://agent402.tools/api/html-table \
  -H "Content-Type: application/json" \
  -d '{"html":"<table><thead><tr><th>City</th><th>Pop</th></tr></thead><tbody><tr><td>NYC</td><td>8.3M</td></tr><tr><td>LA</td><td>3.9M</td></tr></tbody></table>","format":"json"}'

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

Example response

{
  "rows": [
    {
      "City": "NYC",
      "Pop": "8.3M"
    },
    {
      "City": "LA",
      "Pop": "3.9M"
    }
  ],
  "headers": [
    "City",
    "Pop"
  ],
  "format": "json",
  "count": 2
}

From an MCP client

catalog.call {
  "slug": "html-table",
  "params": {
    "html": "<table><thead><tr><th>City</th><th>Pop</th></tr></thead><tbody><tr><td>NYC</td><td>8.3M</td></tr><tr><td>LA</td><td>3.9M</td></tr></tbody></table>",
    "format": "json"
  }
}

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

Errors and behavior

• html 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.
• 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/html-table 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: "$0.001" }); // 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/html-table", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "html": "<table><thead><tr><th>City</th><th>Pop</th></tr></thead><tbody><tr><td>NYC</td><td>8.3M</td></tr><tr><td>LA</td><td>3.9M</td></tr></tbody></table>",
    "format": "json"
  }),
});

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=html-table")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/html-table", { method: "POST", headers: { "X-Pow-Solution": c.token + ":" + n, "Content-Type": "application/json" }, body: JSON.stringify({"html":"<table><thead><tr><th>City</th><th>Pop</th></tr></thead><tbody><tr><td>NYC</td><td>8.3M</td></tr><tr><td>LA</td><td>3.9M</td></tr></tbody></table>","format":"json"}) });

Part of these workflows

HTML table to JSON/CSV is one step in this skill pack, each sold as a single call:

• 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.

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