Decode and encode Uniswap Universal Router calldata (V2, V3, V4). Read-only: never signs or sends.
Connect Runs on your machine
claude mcp add uniswap-universal-router-decoder -e RPC_URL=<RPC_URL> -- uvx uniswap-universal-router-decoder==4.0.0
{
"mcpServers": {
"uniswap-universal-router-decoder": {
"command": "uvx",
"args": [
"uniswap-universal-router-decoder==4.0.0"
],
"env": {
"RPC_URL": "<RPC_URL>"
}
}
}
}
{
"mcpServers": {
"uniswap-universal-router-decoder": {
"command": "uvx",
"args": [
"uniswap-universal-router-decoder==4.0.0"
],
"env": {
"RPC_URL": "<RPC_URL>"
}
}
}
}
{
"servers": {
"uniswap-universal-router-decoder": {
"type": "stdio",
"command": "uvx",
"args": [
"uniswap-universal-router-decoder==4.0.0"
],
"env": {
"RPC_URL": "<RPC_URL>"
}
}
}
}
Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
RPC_URLOptional | Ethereum RPC endpoint. Optional: only decode_transaction needs it. |
Details
| Package | [email protected] (PYPI, stdio) |
| First published | 29 Oct 2026 |
| Last updated | 29 Oct 2026 |
| Registry name | io.github.Elnaril/uniswap-universal-router-decoder |
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