eth_sendRawTransaction

BNB Smart Chain is chain ID 56, and every transaction on it spends BNB for gas. eth_sendRawTransaction is the call that actually puts one on the wire. Sign a transaction client-side, serialize it, then send the resulting RLP-encoded blob to https://bsc.therpc.io/YOUR_API_KEY. The method broadcasts that fully signed transaction to the network and returns its 32-byte hash. That hash is your handle for tracking the transaction while PoSA validators pick it up and seal it into a block within a few seconds. One caveat: the hash confirms acceptance into the mempool, not on-chain success.

Use cases

• Push a BNB transfer onto chain 56 after signing it offline in a cold wallet or hardware signer.
• Deploy a BEP-20 contract by leaving to empty and packing the compiled bytecode into the data field of the signed transaction.
• Trigger a contract write, say a BEP-20 transfer or a PancakeSwap router swap, by broadcasting the signed call.

Parameters

Response

Example request

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H "Content-Type: application/json" \
4  -d '{
5    "jsonrpc": "2.0",
6    "method": "eth_sendRawTransaction",
7    "params": ["0x..."],
8    "id": 1
9  }'

Try it live in the BNB Smart Chain playground.

Errors & troubleshooting

Common pitfalls

• The returned hash only proves the node took the transaction into its mempool, not that it is confirmed; poll eth_getTransactionReceipt to watch for inclusion in a block.
• A successful broadcast does not guarantee on-chain success. A receipt carrying status: "0x0" means the transaction was mined but reverted, and your BNB gas was still burned.
• Pull a fresh nonce with eth_getTransactionCount right before signing; a stale nonce collides with another pending transaction and gets rejected.

Supported networks

• Mainnet — Chain ID: 56
• Testnet — Chain ID: 97

See also

• eth_getTransactionReceipt
• eth_estimateGas
• eth_call

1curl https://bsc.therpc.io/YOUR_API_KEY \
2  -X POST \
3  -H 'Content-Type: application/json' \
4  -d '{"jsonrpc":"2.0","id":1,"method":"eth_sendRawTransaction","params":[""]}'