eth_sendRawTransaction

eth_sendRawTransaction broadcasts a fully signed, RLP-encoded transaction to Arbitrum One and returns its transaction hash. You build and sign the transaction client-side — paying gas in ETH, the chain's native token — then submit the serialized bytes; the node forwards it to the sequencer, which orders it into a block. Because Arbitrum One is an Optimistic Rollup, the fee you commit to covers both the L2 execution cost and the L1 calldata posting cost, so size your maxFeePerGas with that combined cost in mind. Sign with the correct chain ID — 42161 (0xa4b1) — and send to https://arbitrum.therpc.io/YOUR_API_KEY.

Use cases

• Submit an ETH transfer on Arbitrum One after signing it offline, keeping the private key off the node entirely.
• Deploy a smart contract by signing a transaction that omits the to field and sets data to the contract bytecode.
• Execute a contract write — such as an ERC-20 transfer or a swap on GMX or Camelot — by sending the signed call.

Parameters

Response

Example request

1curl https://arbitrum.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 Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• The returned hash only proves the node accepted the transaction for the sequencer — not that it is confirmed. Poll eth_getTransactionReceipt to track inclusion, and remember the sequencer's sub-second confirmations are soft until the L1 challenge window passes.
• A successful broadcast does not mean the transaction will succeed on-chain: a receipt with status: "0x0" means it was included but reverted, and the ETH gas was still spent.
• Always fetch a fresh nonce with eth_getTransactionCount immediately before signing to avoid nonce collisions, especially when submitting transactions back-to-back to the fast sequencer.

Supported networks

• Mainnet — Chain ID: 42161
• Sepolia — Chain ID: 421614

See also

• eth_getTransactionReceipt
• eth_estimateGas
• eth_call

1curl https://arbitrum.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":[""]}'