Ping, x402 payment test: a minimal paid call to test that an x402 payment settles

$0.01 per call · failed calls are never charged · no account or subscription: pay per call with a card key or USDC

A paid round-trip check: returns pong and the server time. Use to test that an x402 wallet, client or MCP setup can pay and receive a result.

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://tools.funwords.eu/ping?format=json"

Or one of your 25 free calls, no key:

curl "https://tools.funwords.eu/ping?format=json&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "pong": true,
  "time": "2026-10-18T12:00:00.000Z"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is ping, and the first 25 successful calls are free:

https://tools.funwords.eu/mcp

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