MCP server

TxWhy

io.github.SUNDRAM07/txwhy

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

Failed Solana transaction in, working transaction out. Exact cause, rebuilt tx, verifiable repair.

Working at last checkAbout 726 tokens per request once connected3 tools

https://txwhy.vercel.app/api/mcp

At a glance

Type: MCP server
Publisher: Not verified
Status: Working at last check
Tools: 3
Token cost: About 726 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 txwhy https://txwhy.vercel.app/api/mcp

Claude Desktop

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

Codex (config.toml)

[mcp_servers.txwhy]
url = "https://txwhy.vercel.app/api/mcp"

Gemini CLI

{"mcpServers":{"txwhy":{"httpUrl":"https://txwhy.vercel.app/api/mcp"}}}

Cursor

{"mcpServers":{"txwhy":{"url":"https://txwhy.vercel.app/api/mcp"}}}

VS Code

{"servers":{"txwhy":{"type":"http","url":"https://txwhy.vercel.app/api/mcp"}}}

Antigravity

agy mcp add txwhy https://txwhy.vercel.app/api/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":"txwhy","server_url":"https://txwhy.vercel.app/api/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"txwhy","server_url":"https://txwhy.vercel.app/api/mcp"}

diagnose_transaction ~143 tokens
Explains why a transaction that landed on mainnet failed: the exact failing instruction in the call tree, the named error, its cause, and how to fix it. Read-only and fast. Use repair_transaction when you want a working transaction back.
explain_error ~201 tokens
Looks up what a custom program error code means for a given program, using 1,800+ named errors from major Solana programs plus the runtime's own errors. Use it when you only have a code such as 6001 or 0x1771 from a simulation or an RPC response.
repair_transaction ~382 tokens
Give it a Solana transaction that failed, or one you are about to send. It finds the cause and returns a rebuilt UNSIGNED transaction that has been simulated against live mainnet state to prove it passes. Fixes expired blockhashes, compute-unit limits, priority fees, loaded-data limits, slippage on

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