Merge branch 'feat/get-all-balances' of https://github.com/0xsquid/sq…

…uid-sdk into feat/get-all-balances
0xsquid · Oct 25, 2023 · a9c8b73 · a9c8b73
2 parents 4ad643a + 4ff3b47
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,14 @@
 
 
+## [1.14.1](https://github.com/0xsquid/api-sdk/compare/v1.10.0...v1.14.1) (2023-10-18)
+
+
+### Features
+
+* get from amount ([#218](https://github.com/0xsquid/api-sdk/issues/218)) ([d727de5](https://github.com/0xsquid/api-sdk/commit/d727de5d2c07b1ef12fb091bfe4bea49ba2cb987))
+
+## [1.14.0](https://github.com/0xsquid/api-sdk/compare/v1.10.0...v1.14.0) (2023-09-26)
+
 ## [1.12.1](https://github.com/0xsquid/api-sdk/compare/v1.10.0...v1.12.1) (2023-09-06)
 
 ## [1.12.0](https://github.com/0xsquid/api-sdk/compare/v1.10.0...v1.12.0) (2023-08-29)

diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@0xsquid/sdk",
-  "version": "1.13.0",
+  "version": "1.14.1",
   "description": "🛠 An SDK for building applications on top of 0xsquid",
   "repository": {
     "type": "git",

diff --git a/src/index.ts b/src/index.ts
@@ -847,6 +847,45 @@ export class Squid {
       evmBalances,
       cosmosBalances
     };
+
+  public async getFromAmount({
+    fromToken,
+    toAmount,
+    toToken,
+    slippagePercentage = 1.5
+  }: {
+    fromToken: TokenData;
+    toToken: TokenData;
+    toAmount: string;
+    slippagePercentage?: number;
+  }): Promise<string | null> {
+    try {
+      // parallelize requests
+      const [fromTokenPrice, toTokenPrice] = await Promise.all([
+        this.getTokenPrice({
+          chainId: fromToken.chainId,
+          tokenAddress: fromToken.address
+        }),
+        this.getTokenPrice({
+          chainId: toToken.chainId,
+          tokenAddress: toToken.address
+        })
+      ]);
+
+      // example fromAmount: 10
+      const fromAmount =
+        (toTokenPrice * Number(toAmount ?? 0)) / fromTokenPrice;
+
+      // fromAmount (10) * slippagePercentage (1.5) / 100 = 0.15
+      const slippage = fromAmount * (slippagePercentage / 100);
+
+      // fromAmount (10) + slippage (0.15) = 10.15
+      const fromAmountPlusSlippage = fromAmount + slippage;
+
+      return fromAmountPlusSlippage.toString();
+    } catch (error) {
+      return null;
+    }
   }
 }