MCP server

x402 endpoint checker

dev.workers.soloearn.x402-seller-kit/x402-checker

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

Website

At a glance

Type

MCP server

Publisher

Not verified

Status

Working at last check

Tools

1

Token cost

About 166 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http x402-checker https://x402-seller-kit.soloearn.workers.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.x402-checker]
url = "https://x402-seller-kit.soloearn.workers.dev/mcp"

Gemini CLI

{"mcpServers":{"x402-checker":{"httpUrl":"https://x402-seller-kit.soloearn.workers.dev/mcp"}}}

Cursor

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

VS Code

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

Antigravity

agy mcp add x402-checker https://x402-seller-kit.soloearn.workers.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"x402-checker","server_url":"https://x402-seller-kit.soloearn.workers.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"x402-checker","server_url":"https://x402-seller-kit.soloearn.workers.dev/mcp"}

Tools

• check_x402_endpoint ~166 tokens
  Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.

Browse

• Payments

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Badge for your README

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