How-to: Estimate swap rate

You can get a pre-swap estimate of the amount you’ll receive before swapping.

Prerequisites

Before you begin, ensure that you’ve:

Installed the App Kit SDK
Configured an adapter

These are required so any example below runs with a valid kit and adapter.

Estimate swap amount

This example estimates how much EURC you’ll receive when swapping 1.00 USDC for EURC:

TypeScript

const params = {
  from: { adapter, chain: "Arc_Testnet" },
  tokenIn: "USDC",
  amountIn: "1.00",
  tokenOut: "EURC",
  config: {
    apiKey: process.env.CIRCLE_API_KEY as string, // optional — configure for production or high-volume usage
  },
};

// Estimate swap amount
const estimate = await kit.estimateSwap(params);
console.log(`Estimated output: ${estimate.estimatedOutput}`);

// Proceed to swap
const result = await kit.swap(params);

Arc testnet liquidity is thin, so a swap can pass estimation and still revert during execution with ONCHAIN_SIMULATION_FAILED. If this happens, raise the slippage tolerance above the 300 bps default. See Swap error handling.

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How-to: Estimate swap rate

Prerequisites

Estimate swap amount

​Prerequisites

​Estimate swap amount

Prerequisites

Estimate swap amount