FabTally Decode

Name: FabTally Decode
Author: zvmzaretsky

@zvmzaretskyMCP server · External

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

Blockchain datav1.0.0MITJavaScript

Freeno charge per call

One address for any MCP client. No sign-in needed on this server.

What it does

2 read2 other

Grouped by tool name. At most: only reads or looks up information.

What it costs

Free

Odel charges nothing per call. The publisher may charge for its own service.

Tools

4 · grouped by tool name · checked 24 Oct 2026

Read · 2Look things up

selector_lookup
abi_fetch

Other · 2Neither hinted nor named

decode_log
decode_calldata

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README2 min readView on GitHub

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.