eth_sendRawTransaction

eth_sendRawTransaction broadcasts a fully signed, RLP-encoded transaction to the Avalanche C-Chain (chain ID 43114), whose gas is paid in AVAX, and returns the resulting transaction hash. You sign the transaction client-side — never send a private key to the node — then submit the serialized bytes; the node validates them, places the transaction in its mempool, and propagates it. Thanks to Snowman/Avalanche consensus, an accepted transaction typically finalizes within about one to two seconds. Send the request to https://avalanche.therpc.io/YOUR_API_KEY.

Use cases

• Submit a native AVAX transfer after signing it offline, then broadcast the raw bytes to the C-Chain.
• Deploy a smart contract by omitting the to field and setting data to the contract bytecode in the signed transaction.
• Execute a contract write — for example an ERC-20 transfer or an Aave deposit — by broadcasting the signed call.

Parameters

Response

Example request

1curl https://avalanche.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 Avalanche 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 to track inclusion; on the C-Chain finality is fast (about 1–2 seconds), so the wait is usually brief.
• A successful broadcast does not guarantee on-chain success: a receipt with status: "0x0" means the transaction was included but reverted, and the AVAX gas was still spent.
• Always fetch a fresh nonce with eth_getTransactionCount immediately before signing to avoid nonce collisions, especially when sending several C-Chain transactions in quick succession.

Supported networks

• Mainnet — Chain ID: 43114
• Fuji

See also

• eth_getTransactionReceipt
• eth_estimateGas
• eth_call

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