A keyless MCP server that builds unsigned Uniswap v3 liquidity-position transactions and optionally simulates them via eth_call. It never holds keys and never signs — you take the returned calldata…
Uniswap Tx Builder is an MCP project maintained in the yummybait-fin/uniswap-tx-builder-mcp repository. The maintainer describes its purpose as “A keyless MCP server that builds unsigned Uniswap v3 liquidity-position transactions and optionally simulates them via eth_call. It never holds keys and never signs —…”. Read the project documentation for the complete scope.
The documented npm package is @yummybait/uniswap-tx-builder-mcp. The configuration below comes from the maintainer’s example; adapt its paths and account values to your environment.
The example declares RPC_ETH. Secret-looking values have been replaced with placeholders. Required and optional labels are shown only when the documentation states them.
Project documentation · Repository · Discovery listing. This profile records the public documentation checked on 2026-10-08.
Check the linked publisher documentation and your connected client's tool list. Names and availability can vary with the server version and account permissions.
| Tool | What it does |
|---|---|
| build_collect | Collect all uncollected fees from a position to recipient. |
| build_close | Remove all liquidity + collect; burn: true also burns the empty NFT. Returns the read position. |
| build_mint | Mint a new position (raw ticks + wei amounts). |
| build_increase | Add liquidity to an existing position. |
| build_approve | Build an ERC-20 approve(spender, amount) tx — e.g. the NFPM before build_mint/build_increase, or Permit2 before a Permit2-paid build_swap. amount: "max" for an |
| build_wrap | Wrap native ETH → WETH via the Universal Router (WRAP_ETH). |
| build_swap | Exact-in single-hop tokenIn → tokenOut swap via the Universal Router; with wrapWei (tokenIn = WETH9) it wraps native ETH first and sweeps the remainder, with… |
| get_swap_quote | Read-only. Quote an exact-in single-hop swap via Uniswap v3 QuoterV2 — the live amountOut a build_swap with the same params would get, plus amountOutMin (after |
| plan_position | Read-only. Turn a human price range + human amounts into aligned ticks + wei amounts for build_mint. Reads token decimals over RPC. |
| get_pool_state | Read-only. Live pool state (tick, sqrtPriceX96, human price, spacing); optional ±pct range suggestion (rounded inward) and live-ratio… |
| get_positions | Read-only. List every position NFT a wallet holds (token0/1, fee, tick range, liquidity, tokens owed) via the NFPM's ERC-721 enumeration. |
{
"mcpServers": {
"uniswap-tx-builder": {
"command": "npx",
"args": [
"-y",
"@yummybait/uniswap-tx-builder-mcp"
],
"env": {
"RPC_ETH": "https://your-eth-rpc"
}
}
}
}From the project documentation. Replace placeholders and example paths before connecting.
| Variable | Description | Required |
|---|---|---|
| RPC_ETH | Declared in the maintainer’s client configuration. | Check documentation |
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