Gravatar existence check

Check whether an email address has a Gravatar: hashes the normalized email (MD5, pure CPU — the raw address is never sent upstream), probes gravatar.com for an avatar, and fetches the public profile when one exists (display name, username, profile URL). Accepts a raw email or a precomputed MD5/SHA-256 hash. Signal-only: a Gravatar's existence suggests a real, web-active address but does NOT verify identity or deliverability — pair with /api/email-validate for MX checks.

Input

Example output

{
  "hash": "205e460b479e2e5b48aec07710c08d50",
  "exists": true,
  "avatarUrl": "https://gravatar.com/avatar/205e460b479e2e5b48aec07710c08d50",
  "profile": {
    "displayName": "Beau Lebens",
    "preferredUsername": "beau",
    "profileUrl": "https://gravatar.com/beau"
  },
  "note": "Existence is a web-activity signal only — it does not verify identity or deliverability."
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/gravatar-check \
  -H "Content-Type: application/json" \
  -d '{"hash":"205e460b479e2e5b48aec07710c08d50"}'

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/gravatar-check", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "hash": "205e460b479e2e5b48aec07710c08d50"
  }),
});

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