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FabTally Decode MCP

FabTally Decode MCP

by zvmzaretsky
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JavaScript
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FabTally Decode — MCP server

Developer on-chain decoding reads that turn raw EVM bytes into human-readable JSON — the capability buried inside $49-999/mo RPC plans. Fronts the Decode HTTP API at https://decode.fabtally.com. Holds no private key.

Tools (all paid; a call with no payment returns the decoded x402 402 challenge)

Tool

Price

What it does

decode_log

$0.003

Flagship. Decode event LOGS to JSON. {chain, tx_hash} decodes every log in a tx, or {chain, address, topics[], data} a single log; optional abi. Returns event name + canonical signature + named/typed args — handling tuple/array/nested params, anonymous events, indexed vs non-indexed. Resolves ABI via Sourcify/Blockscout + 4byte when none is given.

decode_calldata

$0.002

Decode a function call. {chain, to?, data, abi?} → selector resolved to a function signature (provided ABI / verified source / 4byte.directory) + fully decoded typed arguments.

selector_lookup

$0.001

Resolve a 4-byte function selector (0x+8 hex) or a 32-byte event topic (0x+64 hex) to human signature(s) via 4byte.directory + openchain.xyz, with a verified flag.

abi_fetch

$0.002

Fetch a contract's verified ABI + metadata (Sourcify/Blockscout) + verification status + full proxy-implementation resolution (EIP-1967/1822/OZ-legacy/beacon) — returns the implementation ABI for proxies. Args: address, chain.

Chains: ethereum, base, arbitrum, optimism, polygon, bsc.

Every tool also accepts an optional x_payment (base64 x402 payload) that is forwarded as the X-PAYMENT header to settle the call and return the real result. Humans can instead prepay by card and use an X-FabTally-Key credit key against the HTTP API.

Related MCP server: Tollbooth MCP Server

Transports

  • stdio (portable): npx fabtally-decode-mcp (bin: fabtally-decode-mcp)

  • streamable-http (hosted): https://decode.fabtally.com/mcp

Config: FABTALLY_DECODE_BASE (default https://decode.fabtally.com).

Read-only, keyless, stateless, descriptive. Operated by Sunstone Soft (fabtally.com). Not a security guarantee or financial advice.

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

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

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    Deploy Server
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    TDQS

    A4.4/5.0

    Scored across 4 tools

    Disambiguation5/5

    Each tool targets a distinct operation: log decoding, calldata decoding, selector/topic resolution, and ABI fetching. The inputs and outputs are clearly differentiated, so an agent would have no trouble selecting the right tool for a given task.

    Naming Consistency4/5

    All tool names use lowercase snake_case, but the verb/noun order is inconsistent: decode_log and decode_calldata are verb_noun, while selector_lookup and abi_fetch are noun_verb. This is a minor deviation from a uniform pattern, but the names still read predictably.

    Tool Count5/5

    With 4 tools, the server is well-scoped for its purpose of decoding EVM data. Each tool covers a distinct aspect of the decoding workflow, and there is no redundancy or bloat.

    Completeness5/5

    The tool set covers the full decoding lifecycle: fetching ABIs, resolving selectors/topics, decoding calldata, and decoding event logs. There are no obvious gaps for typical EVM decoding tasks, and the tools work together as a complete pipeline.

    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

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