Semver parse/compare

Parse a semantic version, or compare two (a vs b → -1/0/1, with greater/lesser flags).

Input

Field	Type	Description
a *	string	Version to parse (or left side of compare)
b	string	Optional right side of compare

Example output

{
  "a": {
    "major": 2,
    "minor": 4,
    "patch": 0
  },
  "comparison": -1,
  "aGreater": false,
  "equal": false
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/semver \
  -H "Content-Type: application/json" \
  -d '{"a":"2.4.0","b":"2.10.1"}'

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/semver", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "a": "2.4.0",
    "b": "2.10.1"
  }),
});

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