dex-data MCP server

Live multi-chain DEX market data as MCP tools: token prices, liquidity depth, pool reserves, best execution venue, liquidity risk and pre-trade slippage across BNB Chain, Polygon, Arbitrum, Base and Avalanche.

Why this exists

The ledger says it plainly. Of 20,392 paywall challenges recorded, zero were genuine third-party queries — 82.5% were our own monitoring, 17.3% were catalogue crawlers walking every route with no parameters. We were being indexed, not shopped.

Bazaar listings are a bet on demand that does not exist yet. MCP is where agents already are today: Claude Desktop, Claude Code, Cursor, and every other MCP host. This server is the same data, delivered where the users are, and it needs no payment at all for the free tier — which removes the one barrier that a browsing agent cannot cross on its own.

Install

Claude Code

claude mcp add dex-data -- npx -y @donnyautomation/dex-data-mcp

Claude Desktop / Cursor — add to claude_desktop_config.json:

{
  "mcpServers": {
    "dex-data": {
      "command": "npx",
      "args": ["-y", "@donnyautomation/dex-data-mcp"]
    }
  }
}

No API key, no wallet, no signup. The free tier answers every tool for a daily allowance; after that the endpoints fall back to x402 micropayments.

Tools

tool	answers
get_token_price	USD price of any ERC-20, by ticker or contract address
get_liquidity	market depth and TVL per venue for a pair
get_best_venue	which DEX is cheapest to buy on / best to sell into
get_slippage	price impact for a specific trade size
get_liquidity_risk	DEEP / MODERATE / SHALLOW / VERY_THIN depth class
list_chains	supported chains and indexed tokens

Free tier

Every tool answers free within a daily per-caller allowance — no wallet, no signup. The remaining quota is returned on X-FreeTier-Remaining. Beyond it, calls fall back to x402 micropayments (USDC on Base).

Every response carries the liquidity backing the number and a confidence rating. A quote with no depth behind it is refused rather than returned — a dust-pool price is worse than no price when an agent may trade on it.

Honest limits

• Depth and prices cover the venues this API indexes; a deeper pool may exist on a DEX not covered here.
• v3 figures distinguish custody TVL from tradeable depth at the current price. They are not the same number and are not labelled as if they were.
• get_slippage is pool-level price impact: it excludes gas, MEV and multi-hop routing, and flags v3 estimates that cross the active tick band.