Uniswap Universal Router Decoder

Install

uvx uniswap-universal-router-decoder==4.0.0

Built for

Any MCP client. Works as a standard MCP server, so it can be added to any MCP client, including Claude, Cursor and Codex. Based on the listing description and package type. This is not a certification from those products.

Transports: stdio.

Links

• Repository
• pypi package uniswap-universal-router-decoder
• Registry record

Other

Audit report

Audited by AddonAudit.

Sandbox handshake completed and the published checks passed.

Automated smoke test, not a security guarantee.

Version

4.0.0

Audited

2 Nov 2026

Package

pypi uniswap-universal-router-decoder

Advisories

0 critical, 0 high, 0 medium, 0 low

Time to ready

1940 ms

Network

Disabled

• Pass Version. Pinned pypi uniswap-universal-router-decoder@4.0.0
• Pass Known vulnerabilities. No critical, high, or medium advisories were returned.
• Pass License. MIT
• Pass Install scripts. No preinstall, install, postinstall, or prepare script.
• Pass Credential patterns. No credential patterns in the published artifact.
• Pass Package size. 59.0 KB
• Pass Maintainer activity. Active 6 days ago.
• Pass Sandbox. MCP handshake completed. 8 tools listed. Tool count measured offline in our sandbox; some servers load more tools when connected.

Tools

• decode_transaction Fetch a transaction from an RPC endpoint and decode the Universal Router call it contains. :param tx_hash: the hash of the transaction sent to the Universal Router :param rpc_url: the RPC endpoint to use, overriding $RPC_URL / $ETH_RPC_UR
• decode_calldata Decode raw Universal Router calldata (no RPC endpoint needed). :param calldata: the "0x"-prefixed calldata of a transaction sent to the Universal Router :return: {"function": <name>, "params": ...} or an "error"
• encode_calldata Build the Universal Router calldata of an "execute" call from its decoded form. The mirror of decode_calldata(): where the decoder turns calldata into commands, this turns the decoded commands back into calldata, so a route can be decoded
• decode_error Decode a Uniswap Universal Router / Permit2 / V4 custom error. :param error_data: the "0x"-prefixed error data, ex: "0x5d1d0f9f" :return: {"name": <signature>, "args": ...} or an "error"
• decode_v3_path Decode a V3 router path into the ordered tokens and pool fees. :param fn_name: "V3_SWAP_EXACT_IN" or "V3_SWAP_EXACT_OUT" :param path: the "0x"-prefixed encoded V3 path :return: {"fn_name": ..., "path": [<token>, <fee>, <token>, ...]} or a
• encode_v3_path Encode a V3 swap path from its ordered tokens and the pool fees between them. The mirror of decode_v3_path(): where the decoder turns a packed path into tokens and fees, this turns tokens and fees into the packed path to use as the "path"
• list_commands Describe the decoded call format and every Universal Router command. :return: {"format": <the envelope>, "commands": [<command description>, ...]}
• describe_command Describe one Universal Router command: its parameters, their types and, where the type is not enough, their meaning. :param command: the command name, as it appears in a decoded call (ex: V3_SWAP_EXACT_IN, decreaseLiquidity) :return: {"co

Raw audit JSON

Metadata checks

• Repository activity: Active in the last 180 days
• License: Recognized SPDX id
• Metadata quality: High

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