FabTally Decode

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Decodes raw EVM bytes into human-readable JSON via tools for logs, calldata, selectors, and ABIs across multiple chains. Read-only, keyless, and stateless, with

by zvmzaretsky

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About

Decodes raw EVM bytes into human-readable JSON via tools for logs, calldata, selectors, and ABIs across multiple chains. Read-only, keyless, and stateless, with optional x402 payment settlement.

README

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.

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.

from github.com/zvmzaretsky/onchain-decode-mcp

Installing FabTally Decode

This server has no published package — it is built from source. Open the repository and follow its README.

▸ github.com/zvmzaretsky/onchain-decode-mcp

FAQ

Is FabTally Decode MCP free?

Yes, FabTally Decode MCP is free — one-click install via Unyly at no cost.

Does FabTally Decode need an API key?

No, FabTally Decode runs without API keys or environment variables.

Is FabTally Decode hosted or self-hosted?

A hosted option is available: Unyly runs the server in the cloud, no local setup required.

How do I install FabTally Decode in Claude Desktop, Claude Code or Cursor?

Open FabTally Decode on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.

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