# FabTally Decode MCP server

Decode EVM bytes to JSON: event-log decoder, calldata explainer, selector lookup, ABI fetch.

## Links
- Registry page: https://www.getdrio.com/mcp/io-github-zvmzaretsky-onchain-decode
- Repository: https://github.com/zvmzaretsky/onchain-decode-mcp
- Website: https://decode.fabtally.com

## Install
- Endpoint: https://decode.fabtally.com/mcp
- Auth: Not captured

## Setup notes
- Remote endpoint: https://decode.fabtally.com/mcp

## Tools
- decode_log (Decode event logs to typed JSON (paid $0.003)) - PAID $0.003 (x402, USDC on Base). FLAGSHIP: decode EVM event LOGS to human-readable JSON. Give {chain, tx_hash} to decode every log in a transaction, OR {chain, address, topics[], data} for a single log; optional {abi}. Returns each event's name, canonical signature and named/typed args — correctly handling tuple/array/nested params, anonymous events, and indexed vs non-indexed. Resolves the ABI via Sourcify/Blockscout + 4byte event signatures when none is supplied. Without payment returns the x402 challenge; pass x_payment to settle. Endpoint: https://decode.fabtally.com/mcp
- decode_calldata (Decode a function call's calldata (paid $0.002)) - PAID $0.002 (x402, USDC on Base). Decode a contract function call. Give {chain, to?, data, abi?}; get the 4-byte selector resolved to a function signature (via provided ABI, the verified contract source, or 4byte.directory) plus fully decoded, typed arguments (tuples/arrays/nested included). Without payment returns the x402 challenge. Endpoint: https://decode.fabtally.com/mcp
- selector_lookup (Resolve a selector or event topic to a signature (paid $0.001)) - PAID $0.001 (x402, USDC on Base). Resolve a 4-byte function selector (0x + 8 hex) OR a 32-byte event topic hash (0x + 64 hex) to its human-readable signature(s) via 4byte.directory + openchain.xyz. Returns all matches (selectors can collide) with a verified flag. Without payment returns the x402 challenge; pass x_payment to settle. Endpoint: https://decode.fabtally.com/mcp
- abi_fetch (Fetch a contract's verified ABI + proxy resolution (paid $0.002)) - PAID $0.002 (x402, USDC on Base). Fetch the verified ABI + metadata for a contract. Give {address, chain}; get the ABI JSON, verification status/source (Sourcify or Blockscout), the callable function/event signatures, and full proxy-implementation resolution (EIP-1967/1822/OZ-legacy/beacon) — returning the implementation's ABI when it's a proxy. Without payment returns the x402 challenge; pass x_payment to settle. Endpoint: https://decode.fabtally.com/mcp

## Resources
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## Prompts
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## Metadata
- Owner: io.github.zvmzaretsky
- Version: 1.0.0
- Runtime: Streamable Http
- Transports: HTTP
- License: Not captured
- Language: Not captured
- Stars: Not captured
- Updated: Aug 1, 2026
- Source: https://registry.modelcontextprotocol.io