[sdk]: estimate order in source native (#713)

Author: royvardhan

sdk/packages/sdk/src/protocols/intents/GasEstimator.ts

@@ -28,7 +28,7 @@ import type { HexString } from "@/types"
 import type { IntentGatewayContext } from "./types"
 import { BundlerMethod } from "./types"
 import type { BundlerGasEstimate, PimlicoGasPriceEstimate } from "./types"
-import { getFeeToken, transformOrderForContract, convertGasToFeeToken } from "./utils"
+import { getFeeToken, transformOrderForContract, convertGasToFeeToken, convertFeeTokenToWei } from "./utils"
 import { CryptoUtils } from "./CryptoUtils"
 
 /**
@@ -241,17 +241,15 @@ export class GasEstimator {
 				preVerificationGas = (BigInt(gasEstimate.preVerificationGas) * 105n) / 100n
 
 				if (pimlicoGasPrices) {
-					const level =
-						pimlicoGasPrices.fast ?? pimlicoGasPrices.standard ?? pimlicoGasPrices.slow ?? null
+					const level = pimlicoGasPrices.fast ?? pimlicoGasPrices.standard ?? pimlicoGasPrices.slow ?? null
 
 					if (level) {
 						const pimMaxFeePerGas = BigInt(level.maxFeePerGas)
 						const pimMaxPriorityFeePerGas = BigInt(level.maxPriorityFeePerGas)
 
 						maxFeePerGas = pimMaxFeePerGas + (pimMaxFeePerGas * BigInt(maxFeeBumpPercent)) / 100n
 						maxPriorityFeePerGas =
-							pimMaxPriorityFeePerGas +
-							(pimMaxPriorityFeePerGas * BigInt(priorityFeeBumpPercent)) / 100n
+							pimMaxPriorityFeePerGas + (pimMaxPriorityFeePerGas * BigInt(priorityFeeBumpPercent)) / 100n
 					}
 				}
 			} catch (e) {
@@ -275,19 +273,22 @@ export class GasEstimator {
 		}
 
 		const totalGas = callGasLimit + verificationGasLimit + preVerificationGas
-		const totalGasCostWei = totalGas * maxFeePerGas
+		const rawTotalGasCostWei = totalGas * maxFeePerGas
+
 		const totalGasInDestFeeToken = await convertGasToFeeToken(
 			this.ctx,
 			totalGas,
 			"dest",
 			destStateMachineId,
 			gasPrice,
 		)
-		const totalGasInSourceFeeToken = adjustDecimals(
-			totalGasInDestFeeToken,
-			destFeeToken.decimals,
-			sourceFeeToken.decimals,
-		)
+		const totalGasInSourceFeeToken = isSameChain
+			? totalGasInDestFeeToken
+			: adjustDecimals(totalGasInDestFeeToken, destFeeToken.decimals, sourceFeeToken.decimals)
+
+		const totalGasCostWei = isSameChain
+			? rawTotalGasCostWei
+			: await convertFeeTokenToWei(this.ctx, totalGasInSourceFeeToken, "source", souceStateMachineId)
 
 		return {
 			callGasLimit,

sdk/packages/sdk/src/protocols/intents/utils.ts

@@ -219,3 +219,50 @@ export async function convertGasToFeeToken(
 		return parseUnits(gasCostInFeeToken.toFixed(feeToken.decimals), feeToken.decimals)
 	}
 }
+
+/**
+ * Converts a fee-token amount on a given chain into the equivalent native wei amount.
+ *
+ * First attempts a Uniswap V2 quote (fee token -> WETH). If that quote fails or
+ * returns zero, falls back to a price-oracle estimate assuming the fee token is $1.
+ *
+ * @param ctx - Shared IntentsV2 context.
+ * @param feeTokenAmount - Amount in fee token units (scaled by fee token decimals).
+ * @param feeTokenIn - Which chain side the fee-token amount belongs to (`"source"` or `"dest"`).
+ * @param evmChainID - State-machine ID of the chain used for conversion.
+ * @returns Native wei-equivalent amount.
+ */
+export async function convertFeeTokenToWei(
+	ctx: IntentGatewayContext,
+	feeTokenAmount: bigint,
+	feeTokenIn: "source" | "dest",
+	evmChainID: string,
+): Promise<bigint> {
+	const chain = ctx[feeTokenIn]
+	const client = chain.client
+	const wethAddr = chain.configService.getWrappedNativeAssetWithDecimals(evmChainID).asset
+	const feeToken = await getFeeToken(ctx, evmChainID, chain)
+
+	try {
+		const { amountOut } = await ctx.swap.findBestProtocolWithAmountIn(
+			client,
+			feeToken.address,
+			wethAddr,
+			feeTokenAmount,
+			evmChainID,
+			{ selectedProtocol: "v2" },
+		)
+		if (amountOut === 0n) {
+			throw new Error()
+		}
+		return amountOut
+	} catch {
+		const nativeCurrency = client.chain?.nativeCurrency
+		const chainId = Number.parseInt(evmChainID.split("-")[1])
+		const feeTokenAmountInToken = new Decimal(formatUnits(feeTokenAmount, feeToken.decimals))
+		const nativeTokenPriceUsd = await fetchPrice(nativeCurrency?.symbol, chainId)
+		const feeTokenAmountUsd = feeTokenAmountInToken.times(new Decimal(1))
+		const nativeAmount = feeTokenAmountUsd.dividedBy(nativeTokenPriceUsd)
+		return parseUnits(nativeAmount.toFixed(nativeCurrency?.decimals ?? 18), nativeCurrency?.decimals ?? 18)
+	}
+}

sdk/packages/sdk/src/tests/sequential/intentGateway.test.ts

@@ -116,8 +116,10 @@ async function runCrossChainEstimate(srcKey: string, destKey: string) {
 	const estimate = await intentGateway.estimateFillOrder({ order })
 
 	console.log(`${srcKey} => ${destKey}`)
+	console.log("Estimated cost (totalGasCostWei):", estimate.totalGasCostWei)
 	console.log("Estimated fee (totalGasInFeeToken):", estimate.totalGasInFeeToken)
 
+	assert(estimate.totalGasCostWei > 0n)
 	assert(estimate.totalGasInFeeToken > 0n)
 }
 
@@ -138,6 +140,8 @@ async function runSameChainEstimate(chainKey: string) {
 
 	const estimate = await intentGateway.estimateFillOrder({ order })
 
+	console.log(`${chainKey} same-chain estimated cost (totalGasCostWei):`, estimate.totalGasCostWei)
 	console.log(`${chainKey} same-chain USDC => EXT, estimated fee:`, estimate.totalGasInFeeToken)
+	assert(estimate.totalGasCostWei > 0n)
 	assert(estimate.totalGasInFeeToken > 0n)
 }

sdk/packages/simplex/src/tests/strategies/basic.testnet.test.ts

@@ -263,15 +263,6 @@ describe("Filler V2 - Solver Selection ON", () => {
 			console.log(`Order placed successfully with ID: ${order.id}`)
 		}
 
-		for await (const status of gen) {
-			if (status.status === "BID_SELECTED") {
-				console.log(`Bid selected: solver=${status.selectedSolver}, userOpHash=${status.userOpHash}`)
-			}
-			if (status.status === "FAILED") {
-				throw new Error(`Order execution failed: ${status.error}`)
-			}
-		}
-
 		expect(order.id).toBeDefined()
 		expect(order.user).toBe(bytes20ToBytes32(beneficiaryAddress))
 		expect(order.source).toBe(toHex(bscChapelId))