MCP server

FabTally Decode

io.github.zvmzaretsky/onchain-decode

Checked 25 Oct 2026, 20:29 UTC · Connected to it and listed its tools

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

Working at last checkAbout 1,513 tokens per request once connected4 tools

https://decode.fabtally.com/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 4
Token cost: About 1,513 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 25 Oct 2026, 20:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add onchain-decode https://decode.fabtally.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"onchain-decode","server_url":"https://decode.fabtally.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"onchain-decode","server_url":"https://decode.fabtally.com/mcp"}

abi_fetch ~322 tokens
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) — return
decode_calldata ~400 tokens
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
decode_log ~527 tokens
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
selector_lookup ~264 tokens
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 cha

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