navi-x402-mcp

MCP server that gives your AI agent paid superpowers with zero API keys: live crypto prices, weather + air quality, translation, AI market reports, web page intelligence, Google Sheets reading, URL previews — and navi_x402_scout, which finds the best x402 service in the ecosystem for any task.

Every call is paid per-request in USDC on Base via the x402 protocol (prices: $0.001–$0.02). No accounts, no API keys, no subscriptions: your agent's wallet pays only for what it uses.

Setup

Fund a wallet with a few USDC on Base mainnet (a dollar goes a long way).
Add to your MCP client config (Claude Desktop, Cursor, etc.):

config.json

{
  "mcpServers": {
    "navi-x402": {
      "command": "npx",
      "args": ["-y", "navi-x402-mcp"],
      "env": {
        "X402_PRIVATE_KEY": "0x<private key of the paying wallet>",
        "MAX_PRICE_USDC": "0.05"
      }
    }
  }
}

Tools

Tools are generated dynamically from the live Navi catalog — new endpoints appear automatically. Current highlights:

Tool	What it does	Price
`navi_x402_scout`	Top-3 x402 services for a task, ranked by real 30-day usage	$0.005
`navi_crypto_prices`	Live prices, 7d/30d change, ATH context (CoinGecko)	$0.001
`navi_market_report`	Structured AI crypto market analysis	$0.02
`navi_weather`	Forecast + air quality for any location	$0.001
`navi_translate`	Translation with BCP-47 normalization + formality	$0.005
`navi_web_intelligence`	AI page analysis: summary, entities, sentiment	$0.005
`navi_page_context`	Page structure, link taxonomy, repo metadata	$0.005
`navi_google_sheets`	Read any shared Google Sheet as typed JSON	$0.003
`navi_url_preview`	OpenGraph/Twitter card metadata	$0.001
`navi_timestamp`	Timezone-aware time with DST/week signals	$0.001

Safety

MAX_PRICE_USDC (default 0.05) hard-caps the per-call price the server will ever authorize.
The private key never leaves your machine: it signs EIP-3009 transfer authorizations locally; settlement happens on-chain via the Coinbase facilitator.
Without X402_PRIVATE_KEY, tools are listed and explain how to enable payments instead of failing silently.

Env reference

Var	Default	Purpose
`X402_PRIVATE_KEY`	—	Paying wallet (USDC on Base mainnet)
`MAX_PRICE_USDC`	`0.05`	Per-call price ceiling
`NAVI_CATALOG_URL`	Navi public catalog	Alternative catalog source

MIT — built by Navi.