Message emulator (dry run)

Simulate a transfer from any W5, v4 or v3 wallet, or paste a signed external message BOC, and run it on the current chain state without broadcasting. See every resulting transaction, balance changes, exit codes, fees and what each message does.

Reads public chain dataFor developers

Your browser queries public TON APIs (toncenter, tonapi) directly. We run no server in between and store nothing you enter.

Related tools

Transaction BOC decoderDecode a transaction BOC or hash: every phase, exit codes, gas, fees and decoded messages.Transaction re-tracer (step-by-step TVM)Re-run a past transaction in a local TVM and step through every instruction, stack and gas.Transaction lookup & explainerPaste a tx hash or explorer link: see what happened, the full trace, fees and why a step failed.Comment payload builderTurn text into a TON comment payload (BOC) and back; encrypt or decrypt encrypted comments locally Local only External message builder & broadcasterCheck and broadcast a signed external BOC (sendBoc), sign a testnet transfer or wrap a raw external Extra currency inspector & senderSee an account's TON extra currency balances and send them through TonConnect (extraCurrency).History CSV export (tax report)Export a wallet's GRAM and jetton movements for a date range to CSV, with fiat values.