MIME lookup

Look up a MIME type by file extension (?ext=png) or extensions by MIME type (?type=image/png). Covers ~50 common types.

Input

Field	Type	Description
ext	string	File extension (with or without dot)
type	string	MIME type to reverse-lookup

Example output

{
  "ext": "webp",
  "mime": "image/webp"
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/mime?ext=webp"

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/mime?ext=webp");

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