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FabTally Decode

by io.github.zvmzaretsky
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Server Details

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

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Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
Repository
zvmzaretsky/onchain-decode-mcp
GitHub Stars
0
Server Listing
FabTally Decode MCP
ChatGPT
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Claude
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TDQS

A4.5/5.0

Scored across 4 tools

Disambiguation5/5

Each tool has a clearly distinct purpose: fetching ABIs, decoding function calldata, decoding event logs, and resolving selectors/topics. There is no overlap in what they do, and their scopes are mutually exclusive.

Naming Consistency4/5

All names are lowercase snake_case and concise, but they mix verb-first (decode_calldata, decode_log) with noun-first (abi_fetch, selector_lookup) patterns. This is a minor deviation from a uniform verb_noun convention, but still predictable and readable.

Tool Count5/5

Four tools is a well-scoped size for a specialized decoding server. Each tool covers a necessary step in the decoding workflow without redundancy or bloat.

Completeness5/5

The tool set covers ABI retrieval, calldata decoding, event log decoding, and signature lookup, providing a complete lifecycle for decoding EVM data with no obvious dead ends. Optional ABI inputs allow flexible fallback to public sources.

Available Tools

4 tools
abi_fetchFetch a contract's verified ABI + proxy resolution (paid $0.002)AInspect

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.

Inputs: chain (required), address (required), x_payment.

decode_calldataDecode a function call's calldata (paid $0.002)AInspect

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.

Inputs: data (required), chain (required), to, abi, +1 more.

decode_logDecode event logs to typed JSON (paid $0.003)AInspect

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.

Inputs: chain (required), abi, data, topics, +3 more.

selector_lookupResolve a selector or event topic to a signature (paid $0.001)AInspect

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.

Inputs: selector (required), x_payment.

Tool Schema Changelog

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