eth_maxPriorityFeePerGas

eth_maxPriorityFeePerGas returns the node's suggested priority fee — the tip per unit of gas, denominated in wei of ETH — for an EIP-1559 transaction on OP Mainnet. OP Mainnet is an OP Stack rollup at chain ID 10 (0xa) that uses ETH for gas and supports the EIP-1559 fee market, so this heuristic gives you a sensible maxPriorityFeePerGas value derived from recent block history. With ~2s blocks and a single sequencer, tips on OP Mainnet are usually very small. Call it at https://optimism.therpc.io/YOUR_API_KEY to seed the tip portion of your fee fields.

Use cases

• Populate the maxPriorityFeePerGas field when building an EIP-1559 (type-2) transaction for OP Mainnet before signing and broadcasting it via eth_sendRawTransaction.
• Seed a fee-suggestion UI in a wallet or dApp (for example one interacting with Velodrome or Synthetix) with a sensible default tip drawn from recent OP Mainnet block history.

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

Try it live in the Optimism playground.

Errors & troubleshooting

Common pitfalls

• The value is a heuristic, not a protocol constant — two different nodes may return slightly different tips for the same OP Mainnet block, so treat it as a suggestion rather than an exact figure.
• This method assumes the EIP-1559 fee market. On a chain that does not implement it the call may fail or return a meaningless value; OP Mainnet does support EIP-1559, but for legacy non-1559 contexts use eth_gasPrice instead.
• The priority fee is only part of the cost on OP Mainnet — the L2 base fee plus a separate L1 data fee dominate the total. For precise fee strategies, prefer eth_feeHistory with explicit percentiles over this single heuristic.

Supported networks

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

See also

• eth_feeHistory
• eth_gasPrice
• 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_maxPriorityFeePerGas","params":[]}'