x402 endpoint checker

dev.workers.soloearn.x402-seller-kitv1.0.0Updated Oct 8, 2026

Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.

VerifiedStreamable HTTPWeb executableDeveloper ToolsFinance

Overview

AI-generated overview

Lets an assistant inspect x402 paid URLs and report their 402 payment requirements without actually paying.

What it does
This remote MCP server checks x402 paid endpoints. According to its description, it tests any x402 paid URL without paying and reports the 402 response, the PAYMENT-REQUIRED header, USDC amounts, the payTo address, EIP-712 details, and CORS behavior. No individual tools are listed in the manifest.
When to use it
Useful when you are building or debugging an x402-paid API or client and want to see what a paid URL demands before spending anything. It is meant for inspecting payment requirements rather than making payments.
Requirements
A remote streamable HTTP endpoint at the provider's workers.dev address; no packages, environment variables, headers, or authentication are declared. Network access to that endpoint is required.
Before you install
The server inspects paid URLs, so the URLs you submit are sent to the provider's remote endpoint. It is described as testing without paying, but confirm that no payment is triggered before pointing it at a live paid resource.

Installation

In SourceWeft

  1. Open x402 endpoint checker in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "x402-checker": {
      "type": "http",
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

Tools

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Version history

1
  1. v1.0.0LatestOct 8, 2026