Paid Echo API

Use when an agent is checking that its x402 payment headers and query encoding survive a paid round trip.

Overview

Use when an agent is checking that its x402 payment headers and query encoding survive a paid round trip. Returns The query parameters you sent, echoed back with a server timestamp. $0.01.

Endpoint

Method	Endpoint	Price	Description
GET	/v1/marketplace/api/paid-echo	$0.0115	Invoke Paid Echo (Ai) and return the upstream response.

How to call it

Requests are paid per call over the x402 protocol. Call the endpoint, receive a 402 Payment Required quote, then repeat the request with the signed payment header. The SDKs do both steps for you.

# 1. Ask for a quote
curl -i https://jarvisclaw.ai/v1/marketplace/api/paid-echo

# 2. Pay it (the SDK signs and retries for you)
curl -H "X-PAYMENT: <signed-payload>" https://jarvisclaw.ai/v1/marketplace/api/paid-echo

Example response

{
  "echo": {
    "hello": "world",
    "n": "1"
  },
  "timestamp": "2026-09-12T00:08:59.286Z",
  "message": "This response was paid for via x402 protocol"
}

FAQ

How much does the Paid Echo API cost?

$0.0115 USDC per call, paid per call over x402. There is no subscription, minimum or monthly fee.

Do I need an API key?

No. Call the endpoint, read the 402 Payment Required quote, and repeat the request with a signed USDC payment header. An account API key also works if you prefer prepaid billing.

Which chains can I pay on?

USDC on Base or on Solana. The 402 quote lists the accepted networks and the exact amount; the JarvisClaw SDKs sign and retry for you.

How do I call it from an AI agent?

Send GET to the endpoint above from any HTTP client, or connect the JarvisClaw MCP server and let the agent find and call it with the search_apis and get_api_detail tools.

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Open in the marketplace