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). Send POST /api/gravatar-check with no required fields (2 optional) and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with hash, exists, avatarUrl, profile and note.

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.

Category: Network & domains · Tags: network email gravatar avatar enrichment people signal

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Parameters

Example request

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

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

Example response

{
  "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."
}

From an MCP client

catalog.call {
  "slug": "gravatar-check",
  "params": {
    "hash": "205e460b479e2e5b48aec07710c08d50"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for gravatar-check; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• 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 cancelled 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.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/gravatar-check 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?.(false); // keep your own spending ceiling in code
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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