What this does
Paste a transaction hash, calldata, a signed raw tx, or a JSON call request. It simulates the call on Ethereum (no gas, no broadcast), decodes calldata and revert reasons, lets you isolate the root cause with state overrides, and shows the full call trace — then you can broadcast a corrected tx with your own wallet.
Troubleshoot a transaction
Paste a tx hash, signed raw tx, calldata, or a JSON call request — the input type is detected automatically.
Build & broadcast
Client-side only — your key never touches a server. Compose a call or relay a pre-signed raw tx.