grams → stones

Convert grams to stones (mass). Pass ?value=N.

1 grams = 0.000157473044418 stones. To convert, multiply the number of grams by 0.000157473044418. The reverse direction is stones → grams.

Common grams to stones values

grams	stones
1 grams	0.000157473044418 stones
2 grams	0.000314946088836 stones
5 grams	0.000787365222089 stones
10 grams	0.00157473044418 stones
25 grams	0.00393682611044 stones
100 grams	0.0157473044418 stones
1000 grams	0.157473044418 stones

Input

Field	Type	Description
value *	string	Numeric value to convert

Example output

{
  "value": 1,
  "from": "grams",
  "to": "stones",
  "result": 0.000157
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/convert/grams-to-stones?value=1"

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/convert/grams-to-stones?value=1");

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 it (16 leading zero bits), 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=convert-grams-to-stones")).json();
let n = 0;
while (lz(createHash("sha256").update(c.challenge + ":" + n).digest()) < c.difficulty) n++;
await fetch("https://agent402.tools/api/convert/grams-to-stones", { method: "GET", headers: { "X-Pow-Solution": c.token + ":" + n } });

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