Server data from the Official MCP Registry
Agent-payable web data over x402: 18 keyless services an agent pays per call.
Agent-payable web data over x402: 18 keyless services an agent pays per call.
Remote endpoints: streamable-http: https://network.mercury-hq.com/mcp
This MCP server implements a clean integration with Mercury's x402 payment protocol for web-data tools. Authentication is wallet-based (MERCURY_PRIVATE_KEY), appropriately scoped to paid operations, and credentials are handled via environment variables. The codebase is small, well-structured, and uses established libraries (viem, x402-fetch). Minor issues include broad error handling and lack of input validation on user-provided parameters, but these do not introduce security vulnerabilities given the server's purpose. Supply chain analysis found 2 known vulnerabilities in dependencies (0 critical, 2 high severity). Package verification found 1 issue.
3 files analyzed · 7 issues found
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Available as Local & Remote
This plugin can run on your machine or connect to a hosted endpoint. during install.
From the project's GitHub README.
17 keyless, signed-provenance web-data tools your AI agent can pay for itself — over x402 on Base mainnet (USDC). No Mercury API key, no account, no signup. Your agent calls a tool, it pays the SKU with your wallet, and gets back the result plus an EIP-191 provenance receipt it can verify offline, forever.
Tools include: clean fetch, LLM-ready markdown, structured extract, link graph, robots, diff, notarize, headers, table extract, feed, availability, validate, batch, sitemap, DNS, readability, redirect — built live from Mercury's catalog, so the list is always current.
npx mercury-x402-mcp
Add to your MCP host (Claude Desktop / Cursor / Cline / any MCP client):
{
"mcpServers": {
"mercury": {
"command": "npx",
"args": ["-y", "mercury-x402-mcp"],
"env": {
"MERCURY_PRIVATE_KEY": "0xYOUR_BASE_MAINNET_WALLET_KEY"
}
}
}
}
MERCURY_PRIVATE_KEY is your Base-mainnet wallet (funded with a little USDC). Mercury is keyless —
the only thing you bring is a wallet to pay per call. Tools cost ~$0.003–$0.02 each.
The mercury_catalog and mercury_verify tools work without a wallet (free).
Firecrawl / Jina / Tavily all gate behind a human-created API key + a credit-card plan — an agent can't onboard itself. Mercury can: an agent discovers the tools, pays over x402, and every result is cryptographically signed so the bytes are provably genuine and untampered — what RAG, trading, and agent-to-agent commerce actually need.
Discovery: https://mercury-x402-jed.fly.dev/.well-known/x402 · https://mercury-x402-jed.fly.dev/llms.txt
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