x402 Merchant Check MCP Server

by gradientdecisions Your server? Claim it

answering

x402 Merchant Check is answering right now. Last checked 12 min ago. It exposes 1 tools. Last commit 21 Sep 2026.

Pre-payment merchant trust checks for x402 agents on Base and Solana.

Uptime history 66 days of history · worst day 92%

66 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

276 ms

Response time

average over 24h

Stars

last commit 21 Sep 2026

What changed 8

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 12 August 2026. No other catalogue keeps this.

19 Aug a tool description was rewritten check_merchant

19 Aug a tool changed the parameters it asks for check_merchant

12 Aug a tool description was rewritten4 times that day check_merchant

12 Aug a tool changed the parameters it asks for2 times that day check_merchant

and 4 more, back to 12 August 2026

Nothing serious here today

Today is the operative word: we check x402 Merchant Check every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add merchant-check --transport http https://mcp.gradientdecisions.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "merchant-check": {
      "url": "https://mcp.gradientdecisions.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.merchant-check]
url = "https://mcp.gradientdecisions.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "merchant-check": {
      "url": "https://mcp.gradientdecisions.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "merchant-check": {
      "url": "https://mcp.gradientdecisions.com/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

merchant

check_merchant

Before paying an unfamiliar merchant via x402, including one just discovered through a marketplace like Coinbase's x402 Bazaar, call this for a machine-readable assessment of their observable on-chain payment behavior, on Base or Solana. Returns a `recommendation` (PROCEED / CAUTION / INSUFFICIENT_SIGNAL) a payment policy can branch on directly, plus supporting evidence: trust tier, confidence, payer diversity, transaction history, category (data_api/compute/content_generation/financial_data/storage/other), known platform URL(s), and the merchant's own advertised price(s) compared against category peers, with no caller-supplied price required for that. This is decision support drawn from observed behavior, not a certification. PROCEED means the available evidence doesn't show cause for concern, not a guarantee of safety. INSUFFICIENT_SIGNAL means there isn't enough history to say either way, distinct from an actual concern. Add a specific quoted price to also check that exact figure against comparable sellers. $0.01 USDC per check, paid via x402.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.gradientdecisions.com/mcp	streamable-http	answering	425 ms	12 min ago

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x402 Merchant Check — questions

Answers built from our own checks of this server.

What can x402 Merchant Check do?

It exposes 1 tools, read directly from the server on our last check. Among them: check_merchant. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is x402 Merchant Check working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 276 ms. The bar chart above shows every period we have measured.

How do I connect x402 Merchant Check?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does x402 Merchant Check need an API key?

No. x402 Merchant Check completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is x402 Merchant Check?

It answers our handshake in 276 ms on average, which is faster than 48% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is x402 Merchant Check open source?

We cannot say either way: written in TypeScript and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.