eth_sendRawTransaction

eth_sendRawTransaction broadcasts a fully signed, RLP-encoded transaction to OP Mainnet and returns its 32-byte hash. OP Mainnet is the ETH-gas OP Stack rollup at chain ID 10 (0xa); you sign the transaction client-side with a library such as ethers, viem, or web3.js — including chain ID 10 so it cannot be replayed on other chains — and submit the resulting hex string to the sequencer for inclusion. The node validates the signature, nonce, and balance, then admits the transaction to its mempool, returning the hash so you can track inclusion. Submit to https://optimism.therpc.io/YOUR_API_KEY.

Use cases

• Submit a plain ETH transfer on OP Mainnet after signing it offline, keeping the private key off the node entirely.
• Deploy a smart contract by omitting the to field and setting data to the contract's creation bytecode; the receipt's contractAddress will hold the deployed address.
• Execute a contract write — for example an ERC-20 transfer or a Velodrome swap — by encoding the call into data, signing, and broadcasting it.

Parameters

Response

Example request

1curl https://optimism.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 Optimism playground.

Errors & troubleshooting

Common pitfalls

• The returned hash only proves the node accepted the transaction into its mempool, not that it is confirmed. Poll eth_getTransactionReceipt until you get a non-null receipt to confirm inclusion — usually quick on OP Mainnet's ~2s blocks.
• A successful broadcast does not mean the transaction will succeed on-chain: a receipt with status: "0x0" means the sequencer included it but execution reverted, and you still pay the L2 gas plus the L1 data fee.
• Always fetch a fresh nonce with eth_getTransactionCount immediately before signing to avoid nonce too low collisions; and budget for the OP Stack L1 data fee on top of L2 gas, since it can dominate the total cost of a small transaction.

Supported networks

• Mainnet — Chain ID: 10
• Sepolia — Chain ID: 11155420

See also

• eth_getTransactionReceipt
• eth_estimateGas
• eth_call

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