All servers · Crypto & blockchain

TxWhy

io.github.SUNDRAM07/txwhy · v0.2.0

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Not declared (tools carry no read/destructive hints)
Capabilities declared	tools
Tool definitions	3 tools · with description 100% · input schema is an object 100% · read/destructive hints 0%

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

streamable-http · https://txwhy.vercel.app/api/mcp

claude mcp add --transport http txwhy https://txwhy.vercel.app/api/mcp

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

repair_transaction
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
diagnose_transaction
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
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.

Website · JSON · Text for agents · Registry updated 2026-10-08