TxWhy

io.github.SUNDRAM07/txwhyVersion 0.2.0

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

Status

Responds82 msNov 14, 2026, 14:42 UTCAnswered our handshake without sign-in.

Registry data may be out of date

We could not refresh it, so this page shows the last copy.

Last checked: Nov 14, 2026, 14:42 UTC
Latency: 82 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 21:12 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://txwhy.vercel.app/api/mcpResponds82 msNov 14, 2026, 14:42 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

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Settings > Connectors > Add custom connector
Name: txwhy
Remote MCP server URL: https://txwhy.vercel.app/api/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"txwhy","type":"http","url":"https://txwhy.vercel.app/api/mcp"}'

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Tools

3 tools

Tools of TxWhy
	Description		Read-only	Idempotent	Open world
`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.	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.	Not declared	Not declared	Not declared	Not declared
`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.	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.	Not declared	Not declared	Not declared	Not declared
`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 plain Jupiter swaps (fresh quote, same tolerance), and slippage on direct Pump.fun, PumpSwap, Raydium AMM v4, Meteora DBC and Meteora DAMM v2 swaps (only the limit moves, never more than 25% against the user). Handles legacy, v0 and version 1 (SIMD-0385) transactions and durable nonces. When the failure cannot be fixed by rebuilding (not enough funds, a private program's own error), it says so and explains why instead of returning something that would fail again. Pass exactly one of `transaction` or `signature`. Sign the returned transaction with your own key and send it within about 60 seconds.	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 plain Jupiter swaps (fresh quote, same tolerance), and slippage on direct Pump.fun, PumpSwap, Raydium AMM v4, Meteora DBC and Meteora DAMM v2 swaps (only the limit moves, never more than 25% against the user). Handles legacy, v0 and version 1 (SIMD-0385) transactions and durable nonces. When the failure cannot be fixed by rebuilding (not enough funds, a private program's own error), it says so and explains why instead of returning something that would fail again. Pass exactly one of `transaction` or `signature`. Sign the returned transaction with your own key and send it within about 60 seconds.	Not declared	Not declared	Not declared	Not declared

Details

Registry status: Active
Published: Oct 8, 2026
Updated: Oct 8, 2026
Website: https://txwhy.vercel.app/⁠ (opens in a new tab)
Repository: Not given
Categories: Uncategorized
GDPR: Not declared

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