MCP server exposing fee-carrying trading tools. Every money-moving tool is two-step (*_prepare → *_execute) behind guardrails: notional cap, slippage cap, allowlists, rate limit, dry-run and geoblock.

{ "mcpServers": { "fillgate": { "command": "npx", "args": ["-y", "@fillgate/mcp"],
  "env": { "DRY_RUN": "true" } } } }

Fees. Jupiter Ultra swaps carry a 50 bps referral fee (Jupiter's Ultra minimum) that routes to Fillgate's own referral account by default. Set JUP_REFERRAL_ACCOUNT to route it to your own account instead — fillgate_status always reports which one is active.

A venue's tools are registered only when its whole write path is configured, so a half-configured venue is invisible to the agent instead of failing at execute time. Out of the box that means Jupiter Ultra (live on Solana mainnet); Polymarket CLOB v2 and Hyperliquid perps ship in the package and turn on once configured. Call fillgate_status first — it reports enabled and a howToEnable for everything else.

Full docs, guardrail table and setup: https://github.com/mineloop99/fillgate

MIT