core, graphql, internal: expose effectiveGasPrice in receipts

internal/ethapi/api.go

@@ -1561,7 +1561,17 @@ func (s *PublicTransactionPoolAPI) GetTransactionReceipt(ctx context.Context, ha
 		"logsBloom":         receipt.Bloom,
 		"type":              hexutil.Uint(tx.Type()),
 	}
-
+	// Assign the effective gas price paid
+	if !s.b.ChainConfig().IsLondon(bigblock) {
+		fields["effectiveGasPrice"] = hexutil.Uint64(tx.GasPrice().Uint64())
+	} else {
+		header, err := s.b.HeaderByHash(ctx, blockHash)
+		if err != nil {
+			return nil, err
+		}
+		gasPrice := new(big.Int).Add(header.BaseFee, tx.EffectiveGasTipValue(header.BaseFee))
+		fields["effectiveGasPrice"] = hexutil.Uint64(gasPrice.Uint64())
+	}
 	// Assign receipt status or post state.
 	if len(receipt.PostState) > 0 {
 		fields["root"] = hexutil.Bytes(receipt.PostState)