FabTally Decode MCP Server

by zvmzaretsky Your server? Claim it

answering

FabTally Decode is answering right now. Last checked 9 min ago. It exposes 4 tools. Last commit 1 Aug 2026.

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

Uptime history 91 days of history · worst day 98%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

158 ms

Response time

average over 24h

Stars

last commit 1 Aug 2026

Nothing serious here today

Today is the operative word: we check FabTally Decode every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 9 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add onchain-decode --transport http https://decode.fabtally.com/mcp

Settings → Connectors → Add custom connector, then paste this address

https://decode.fabtally.com/mcp

~/.codex/config.toml

[mcp_servers.onchain-decode]
url = "https://decode.fabtally.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "onchain-decode": {
      "url": "https://decode.fabtally.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "onchain-decode": {
      "type": "http",
      "url": "https://decode.fabtally.com/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

decode

decode_calldata

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.

decode_log

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.

abi

abi_fetch

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.

selector

selector_lookup

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.

Endpoints

URL	Transport	State	Latency	Checked
https://decode.fabtally.com/mcp	streamable-http	answering	170 ms	9 min ago

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FabTally Decode — questions

Answers built from our own checks of this server.

What can FabTally Decode do?

It exposes 4 tools, read directly from the server on our last check. Among them: abi_fetch, decode_calldata, decode_log, selector_lookup. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is FabTally Decode working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 158 ms. The bar chart above shows every period we have measured.

How do I connect FabTally Decode?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does FabTally Decode need an API key?

No. FabTally Decode completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is FabTally Decode?

It answers our handshake in 158 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is FabTally Decode open source?

The code is open source: it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at decode.fabtally.com, which runs on its operator's own terms.