eth_maxPriorityFeePerGas

eth_maxPriorityFeePerGas returns the node's suggested priority fee — the "tip" paid to validators on top of the base fee — per unit of gas for an EIP-1559 transaction, expressed in wei of the native MATIC. On Polygon, the PoS chain at https://polygon.therpc.io/YOUR_API_KEY (chain ID 137, 0x89), the node derives this figure as a heuristic from recent block history. Polygon supports EIP-1559, so the value is a practical starting point for setting maxPriorityFeePerGas; note that the chain enforces its own non-zero minimum priority fee, which the suggestion reflects.

Use cases

• Populate the maxPriorityFeePerGas field when building an EIP-1559 (type-2) MATIC transaction so it offers a competitive tip given current Polygon demand.
• Seed a wallet or dApp fee-selection UI with a sensible default tip, then let users nudge it up for faster inclusion on Polygon's ~2-second blocks.

Parameters

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

Response

Example request

1curl https://polygon.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 Polygon playground.

Errors & troubleshooting

Common pitfalls

• The figure is a heuristic, not a consensus value: two Polygon nodes may suggest slightly different tips for the same block, so treat it as guidance rather than an exact target.
• This method only makes sense on EIP-1559 chains. Polygon supports it, but for legacy (type-0) transactions or any chain without EIP-1559 you should fall back to eth_gasPrice instead.
• For precise fee strategies on Polygon — for example tuning inclusion speed against cost during congestion — prefer eth_feeHistory with explicit reward percentiles over this single-number suggestion.

Supported networks

• Mainnet — Chain ID: 137
• Amoy — Chain ID: 80002

See also

• eth_feeHistory
• eth_gasPrice
• eth_estimateGas

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