eth_gasPrice

eth_gasPrice returns the node's suggested legacy gas price for OP Mainnet, expressed in ETH wei. It is a single combined number useful for a quick read of current L2 fee conditions or for filling the gasPrice field of a type-0 transaction. Because OP Mainnet supports EIP-1559, this value is derived from the base fee plus a tip and tends to overestimate for type-2 transactions. Query https://optimism.therpc.io/YOUR_API_KEY (chain ID 10, 0xa) to fetch it.

Use cases

• Quick sanity check of current OP Mainnet fee conditions before building a transaction.
• Populate the gasPrice field when constructing a legacy (type-0) transaction for tooling that doesn't speak EIP-1559.
• Feed it into a fee oracle as one input alongside eth_feeHistory percentiles to cross-check your OP Mainnet fee estimate.

Parameters

This method takes no parameters. Pass an empty array [].

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_gasPrice",
7    "params": [],
8    "id": 1
9  }'

Try it live in the Optimism playground.

Errors & troubleshooting

Common pitfalls

• OP Mainnet runs EIP-1559, so this is a derived value that often overestimates — prefer eth_maxPriorityFeePerGas plus eth_feeHistory when building type-2 transactions.
• The result is in ETH wei; divide by 1e9 to display gwei, or by 1e18 to show the price in ETH, and remember the L1 data fee is billed on top of this L2 gas price.

Supported networks

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

See also

• eth_maxPriorityFeePerGas
• eth_feeHistory
• eth_estimateGas

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_gasPrice","params":[]}'