Class TransactionApi

Broadcast a client-signed transaction to the chain via the Binance Web3 API relay. Returns the transaction hash and an internal orderId you can use to track on-chain status via the post-transaction service. Optional MEV protection (EVM chains only) routes the transaction through a private mempool to mitigate front-running and sandwich attacks. Tron and Solana do not support MEV protection; the flag is ignored on these chains.

Look up broadcast orders previously submitted via /pre-transaction/broadcast-transaction. Filter by txStatus or orderId, paginate with cursor.

Estimate the gas limit (or compute-unit ceiling on Solana) for an unsigned transaction. Provide either evmTx for EVM chains, solTx for Solana, or tronTx for Tron ("CT_195"), matching the value of binanceChainId. On Tron the response carries energy/bandwidth fields instead of a single gas limit; gasLimit is the fee limit (in sun) and the energy/bandwidth fields describe resource consumption and pricing.

Query the current network gas price for the specified chain. The response shape varies by chain family:

• EVM chains return both evmLegacyGasPrice (legacy gasPrice) and eip1559GasPrice (baseFee + priority/max fees) when EIP-1559 is supported.
• Solana returns solanaGasPrice (compute-unit prices and Jito tips). - Tron ("CT_195") returns an empty data object because Tron has no on-chain gas-price concept; use the gas-limit endpoint instead.

Fields not applicable to the chain family are returned as null.

Return the latest block height that the Binance Web3 node has synced to for the specified chain. Callers can use this to monitor node sync progress for risk control and detect when the node lags behind the canonical chain head.

Return the blockchain networks supported by the Transaction service for gas estimation, simulation, and broadcasting. The list is dynamically configured server-side and may change over time.

Simulate transaction execution off-chain to predict its outcome before broadcasting. The response includes the predicted execution status, balance changes per affected account/token, and ERC-20 allowance changes (EVM chains). Provide either evmTx (EVM chains), solTx (Solana), or tronTx (Tron "CT_195") matching binanceChainId. On Tron, allowanceChanges is returned as an empty array. Note: Metis (chainId 1088) is not supported by this endpoint.