MCP server

x402 Merchant Check

com.gradientdecisions/merchant-check

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkVerified publisher: gradientdecisions.comAbout 691 tokens per request once connected1 tools

https://mcp.gradientdecisions.com/mcp

At a glance

Type: MCP server
Publisher: gradientdecisions.com (verified by the MCP Registry)
Status: Working at last check
Tools: 1
Token cost: About 691 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

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 merchant-check https://mcp.gradientdecisions.com/mcp

Claude Desktop

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

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"merchant-check":{"type":"http","url":"https://mcp.gradientdecisions.com/mcp"}}}

Antigravity

agy mcp add merchant-check https://mcp.gradientdecisions.com/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":"merchant-check","server_url":"https://mcp.gradientdecisions.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"merchant-check","server_url":"https://mcp.gradientdecisions.com/mcp"}

check_merchant ~691 tokens
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_S

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TWZRD Agent Intelligence
Pre-spend trust for AI agents that buy: check x402 services and product listings before paying.
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Memecoin screener, backtests, exit alerts, wallet traces + web search, enrichment, 50+ tools (x402)
x402 economy tools
Measured x402 ecosystem data, facilitator reliability, and live endpoint checks.
Aval
Payment-backed trust scores for AI agents on Base (ERC-8004). $0.01 per check via x402.
APEX on Arc
Arc for agents: token prices, rug checks (holders, dev pulls), launch exits, free USDC, paid APIs.

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