fixes maxPriorityFeePerGas in _handleTxPricing

CHANGELOG.md

@@ -548,10 +548,12 @@ Released with 1.0.0-beta.37 code base.
 -  Fix static tuple encoding (#4673) (#4884)
 -  Fix bug in handleRevert logic for eth_sendRawTransaction (#4902)
 -  Fix resolve type of getBlock function (#4911)
+-  Fix resolve issue with to low priority fee on polygon (#4857)
 
 ### Changed
 -  Replace deprecated String.prototype.substr() (#4855)
 -  Exporting AbiCoder as coder (#4937)
+-  `web3-core-method._handleTxPricing` uses now `eth_feeHistory` for priority fee calculation on EIP-1559 compatible chains (#5018)
 
 ### Added
 - Exposing `web3.eth.Contract.setProvider()` as per public documentation (#4822) (#5001)

packages/web3-core-method/src/index.js

@@ -861,11 +861,23 @@ function _handleTxPricing(method, tx) {
                 call: 'eth_gasPrice',
                 params: 0
             })).createFunction(method.requestManager);
+            var getFeeHistory = new Method({
+                name: "getFeeHistory",
+                call: "eth_feeHistory",
+                params: 3,
+                inputFormatter: [
+                    utils.numberToHex,
+                    function (blockNumber) {
+                        return blockNumber ? utils.toHex(blockNumber) : "latest";
+                    },
+                    null,
+                ],
+            }).createFunction(method.requestManager);
 
             Promise.all([
                 getBlockByNumber(),
                 getGasPrice()
-            ]).then(responses => {
+            ]).then(async responses => {
                 const [block, gasPrice] = responses;
                 if (
                     (tx.type === '0x2' || tx.type === undefined) &&
@@ -883,7 +895,13 @@ function _handleTxPricing(method, tx) {
                         maxFeePerGas = tx.gasPrice;
                         delete tx.gasPrice;
                     } else {
-                        maxPriorityFeePerGas = tx.maxPriorityFeePerGas || '0x9502F900'; // 2.5 Gwei
+                        const feeHistory = await getFeeHistory(1);
+                        const [baseFee] = feeHistory.baseFeePerGas;
+                        const priorityFee = utils.numberToHex(
+                            utils.hexToNumber(gasPrice) - utils.hexToNumber(baseFee)
+                        );
+
+                        maxPriorityFeePerGas = tx.maxPriorityFeePerGas || priorityFee || '0x9502F900'; // 2.5 Gwei
                         maxFeePerGas = tx.maxFeePerGas ||
                             utils.toHex(
                                 utils.toBN(block.baseFeePerGas)

test/contract.js

@@ -2684,6 +2684,10 @@ var runTests = function(contractFactory) {
 
             provider.injectResult('0x45656456456456');
 
+            provider.injectValidation(function (payload) {
+                assert.equal(payload.method, 'eth_feeHistory')
+                assert.deepEqual(payload.params, ['0x1', 'latest', null])
+            })
 
             provider.injectValidation(function (payload) {
                 assert.equal(payload.method, 'eth_sendTransaction');