Echo a message

$0.003 per call · failed calls are never charged · no account or API key needed

Returns the message you send, with its length and the server time. Use to test an x402 client, payment flow or agent tool wiring end to end.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

NameTypeDescription
message (required)stringMessage, up to 2,000 characters

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/echo?message=hello"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/echo?message=hello&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, Monad, World Chain or Tempo) and retries.

Example result

{
  "message": "hello",
  "length": 5,
  "receivedAt": "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 echo, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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