eth_maxPriorityFeePerGas

eth_maxPriorityFeePerGas returns the node's suggested priority fee — the EIP-1559 tip — per unit of gas, hex-encoded in wei, on Arbitrum One. Gas on this Optimistic Rollup is paid in ETH, so the value is an ETH-denominated tip. Worth noting for Arbitrum One specifically: the sequencer orders transactions on a first-come basis and the protocol's overall fee is dominated by the L2 execution plus L1 calldata posting cost, so the priority tip is typically very small compared with proof-of-work L1s. Use it as a sensible default when assembling EIP-1559 transactions. Send requests to https://arbitrum.therpc.io/YOUR_API_KEY (chain ID 42161, 0xa4b1).

Use cases

• Populate the maxPriorityFeePerGas field when building an EIP-1559 transaction to swap on Camelot or interact with a GMX contract, so the tip matches current sequencer conditions.
• Seed a wallet or dApp fee-suggestion UI with a sensible default tip in ETH that reflects recent Arbitrum One blocks rather than a hardcoded guess.

Parameters

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

Try it live in the Arbitrum One playground.

Errors & troubleshooting

Common pitfalls

• The value is a heuristic derived from recent block history, so two different Arbitrum One nodes may return slightly different tips for the same block — treat it as a suggestion, not a fixed quote.
• This call assumes EIP-1559; Arbitrum One supports it, but if you point the same code at a legacy non-1559 network it may fail or return a meaningless value, in which case use eth_gasPrice.
• For precise fee strategies on Arbitrum One — where the L1 calldata component makes total cost volatile — prefer eth_feeHistory with explicit percentiles instead of relying on this single heuristic.

Supported networks

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

See also

• eth_feeHistory
• eth_gasPrice
• eth_estimateGas

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_maxPriorityFeePerGas","params":[]}'