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Circle SDK for single-chain token swaps with minimal code","maintainers":[{"name":"tomleicircle","email":"mengda.lei@circle.com"},{"name":"igaskin-circle","email":"isaac.gaskin@circle.com"},{"name":"circle-npm-ci","email":"devops@circle.com"}],"readme":"# Swap Kit\n\n\n\n[](https://badge.fury.io/js/@circle-fin%2Fswap-kit)\n[](https://www.typescriptlang.org/)\n[](https://opensource.org/licenses/Apache-2.0)\n[](https://discord.com/invite/buildoncircle)\n\n**A Circle SDK for single-chain token swaps with minimal code, backed by strong type safety and comprehensive validation.**\n\n_Making swapping as simple as a single function call_\n\n
\n\n## Table of Contents\n\n- [Swap Kit](#swap-kit)\n - [Overview](#overview)\n - [Installation](#installation)\n - [Quick Start](#quick-start)\n - [Configuration](#configuration)\n - [Custom Fees](#custom-fees)\n - [Custom Providers (typed)](#custom-providers-typed)\n - [Swap Configuration Options](#swap-configuration-options)\n - [Supported Tokens](#supported-tokens)\n - [Using Native Token](#using-native-token)\n - [Type Definitions](#type-definitions)\n - [SwapParams](#swapparams)\n - [CustomFeePolicy](#customfeepolicy)\n - [Validation](#validation)\n - [License](#license)\n - [Support](#support)\n\n## Overview\n\nSwapKit provides a foundation for building tree-shakeable swap operations with:\n\n- 🔒 **Type Safety**: Full TypeScript support with strict type checking\n- ✅ **Runtime Validation**: Comprehensive Zod schemas for parameter validation\n- 📝 **Rich Documentation**: Complete JSDoc with runnable examples\n- 🎯 **Developer Experience**: IntelliSense support and clear error messages\n- 🔧 **Flexible Configuration**: Customizable fee policies and swap strategies\n\n## Developer Documentation\n\n- [Swap Kit Documentation](https://docs.arc.network/app-kit/swap)\n\n## Installation\n\n```bash\nnpm install @circle-fin/swap-kit\n# or\nyarn add @circle-fin/swap-kit\n```\n\n## Quick Start\n\nSwapKit offers two usage patterns - choose the one that fits your project best:\n\n- Chain selection is constrained to swap-supported networks. Supported chains include\n mainnet networks with CCTP v2 and at least one supported token (USDC, USDT, EURC,\n or other registered tokens). Current examples: Ethereum, Base, Polygon, Arbitrum,\n Optimism, Avalanche, Monad, Solana, and others. Use `getSupportedChains()` to get\n the complete, up-to-date list.\n\n### Class-Based Usage\n\n```typescript\nimport { SwapKit } from '@circle-fin/swap-kit'\nimport { createViemAdapterFromPrivateKey } from '@circle-fin/adapter-viem-v2'\n\n// Create a SwapKit instance\nconst kit = new SwapKit()\n\n// Create an adapter\nconst adapter = createViemAdapterFromPrivateKey({\n privateKey: process.env.PRIVATE_KEY,\n})\n\n// Define swap parameters\nconst params = {\n from: { adapter, chain: 'Ethereum' },\n tokenIn: 'USDC',\n tokenOut: 'USDT',\n amountIn: '100.50',\n config: {\n apiKey: process.env.CIRCLE_API_KEY,\n slippageBps: 300, // 3% slippage tolerance\n allowanceStrategy: 'permit',\n },\n}\n\n// Get an estimate\nconst estimate = await kit.estimate(params)\nconsole.log(\n `Estimated output: ${estimate.estimatedOutput?.amount} ${estimate.estimatedOutput?.token}`,\n)\n\n// Execute the swap\nconst result = await kit.swap(params)\n```\n\n### Functional Usage (Tree-Shakeable)\n\n```typescript\nimport { createSwapKitContext, estimate, swap } from '@circle-fin/swap-kit'\nimport { createViemAdapterFromPrivateKey } from '@circle-fin/adapter-viem-v2'\n\n// Create a swap context\nconst context = createSwapKitContext()\n\n// Create an adapter\nconst adapter = createViemAdapterFromPrivateKey({\n privateKey: process.env.PRIVATE_KEY,\n})\n\n// Define swap parameters\nconst params = {\n from: { adapter, chain: 'Ethereum' },\n tokenIn: 'USDC',\n tokenOut: 'USDT',\n amountIn: '100.50',\n config: {\n apiKey: process.env.CIRCLE_API_KEY,\n slippageBps: 300,\n allowanceStrategy: 'permit',\n },\n}\n\n// Get an estimate\nconst quoteResult = await estimate(context, params)\nconsole.log(\n `Estimated output: ${quoteResult.estimatedOutput?.amount} ${quoteResult.estimatedOutput?.token}`,\n)\n\n// Execute the swap\nconst result = await swap(context, params)\n```\n\nBoth patterns provide identical functionality - the class-based approach offers a familiar class-based interface, while the functional approach allows for better tree-shaking and smaller bundle sizes.\n\n## Configuration\n\n## Custom Fees\n\nSwapKit supports two approaches for charging custom developer fees.\n\n### 1. Percentage-Based Fees\n\nFor straightforward percentage-based fees:\n\n```typescript\nawait kit.swap({\n from: { adapter, chain: Ethereum },\n tokenIn: 'USDC',\n tokenOut: 'DAI',\n amountIn: '100',\n config: {\n apiKey: process.env.CIRCLE_API_KEY,\n customFee: {\n percentageBps: 1000, // 10% fee (100 = 1%)\n recipientAddress: '0x742d35Cc6634C0532925a3b844Bc454e4438f44e',\n },\n },\n})\n```\n\n### 2. Callback-Based Fees\n\nFor complex fee logic:\n\n**Class-Based:**\n\n```typescript\nconst kit = new SwapKit({\n customFeePolicy: {\n computeFee: async (ctx) => {\n // Full context with adapter, chain, tokens, amounts\n if (ctx.type === 'output') {\n // Output fee scenario\n // Access to minAmount and estimatedAmount\n const user = await getUser(ctx.from.address)\n if (user.isVIP) {\n return (parseFloat(ctx.minAmount) * 0.05).toString()\n }\n return (parseFloat(ctx.estimatedAmount) * 0.1).toString()\n }\n\n // Input fee scenario\n return (parseFloat(ctx.amountIn) * 0.05).toString()\n },\n\n resolveFeeRecipientAddress: (chain, ctx) => {\n return chain.type === 'solana'\n ? 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v'\n : '0x1234567890123456789012345678901234567890'\n },\n },\n})\n\n// Or set/update it later\nkit.setCustomFeePolicy({\n computeFee: (ctx) => {\n if (ctx.from.chain.name === 'Ethereum') {\n return (parseFloat(ctx.amountIn) * 0.01).toString()\n }\n return (parseFloat(ctx.amountIn) * 0.005).toString()\n },\n resolveFeeRecipientAddress: (chain) => '0x...',\n})\n\n// Remove the fee policy when needed\nkit.removeCustomFeePolicy()\n```\n\n**Functional:**\n\n```typescript\nimport {\n createSwapKitContext,\n setCustomFeePolicy,\n removeCustomFeePolicy,\n} from '@circle-fin/swap-kit'\n\nconst context = createSwapKitContext({\n customFeePolicy: {\n computeFee: async (ctx) => {\n if (ctx.type === 'output') {\n return (parseFloat(ctx.estimatedAmount) * 0.1).toString()\n }\n return (parseFloat(ctx.amountIn) * 0.05).toString()\n },\n resolveFeeRecipientAddress: (chain, ctx) => {\n return chain.type === 'solana' ? 'Sol...' : '0x...'\n },\n },\n})\n\n// Or set/update later\nsetCustomFeePolicy(context, {\n computeFee: () => '0.05',\n resolveFeeRecipientAddress: (chain) => '0x...',\n})\n\n// Remove when needed\nremoveCustomFeePolicy(context)\n```\n\n---\n\n### Custom Providers (typed)\n\n```typescript\nimport { createSwapKitContext } from '@circle-fin/swap-kit'\n\nclass ExperimentalSwapProvider {\n readonly name = 'ExperimentalSwapProvider'\n // implements SwappingProvider methods (supportsRoute, estimate, swap)\n}\n\nconst extraProviders = [new ExperimentalSwapProvider()] as const\nconst context = createSwapKitContext({ providers: extraProviders })\n\n// TypeScript knows the exact provider types:\ntype RegisteredProviders = typeof context.providers\n// ^? readonly [...DefaultProviders, ExperimentalSwapProvider]\n```\n\nThe context merges default providers with any custom providers you supply while preserving their literal\ntypes. This keeps `context.providers` strongly typed and ready for future provider integrations.\n\n### Authentication\n\nPass a Circle API key as `config.apiKey` to authenticate service-backed\noperations. Omit it to use the permissionless (keyless) path.\n\n```typescript\nconfig: {\n apiKey: process.env.CIRCLE_API_KEY, // _API_KEY::\n}\n```\n\nThe API key is a server-only secret — supplying it from a browser throws. Hold\nit on your server and forward the prepared transaction to the client.\n\n> **Migrating from `kitKey`:** `config.kitKey` is deprecated in favor of\n> `config.apiKey`. It keeps working, and legacy `KIT_KEY::`\n> values are still accepted, so you can move over at your own pace. When both\n> fields are set, `apiKey` wins.\n\n### Swap Configuration Options\n\n```typescript\nconst params = {\n from: { adapter, chain: Ethereum },\n tokenIn: 'USDC',\n tokenOut: 'USDT',\n amountIn: '100',\n config: {\n // API key for authentication (optional — omit for permissionless mode)\n apiKey: process.env.CIRCLE_API_KEY,\n\n // Allowance strategy (default: 'permit')\n allowanceStrategy: 'permit', // or 'approve'\n\n // Maximum slippage in basis points (default: 300 = 3%)\n slippageBps: 300,\n\n // Minimum output amount (stop-limit)\n stopLimit: '95000000', // 95 USDT in smallest units\n\n // Custom fee for this specific swap (percentage approach)\n customFee: {\n percentageBps: 100, // 1% fee\n recipientAddress: '0x742d35Cc6634C0532925a3b844Bc454e4438f44e',\n },\n },\n}\n```\n\n> **Note:** Use transaction-level `percentageBps` for simple fees, or kit-level `setCustomFeePolicy()` for complex logic. They are mutually exclusive.\n\n### Supported Tokens\n\nSwapKit supports 16 tokens for fee collection. At least one token (input OR output) must be from this list.\n\n**Stablecoins (6 decimals):**\n\n- `USDC` - USD Coin\n- `EURC` - Euro Coin\n- `USDT` - Tether USD\n- `PYUSD` - PayPal USD\n\n**Stablecoins (18 decimals):**\n\n- `DAI` - MakerDAO stablecoin\n- `USDE` - Ethena USD\n\n**Wrapped Tokens:**\n\n- `WBTC` - Wrapped Bitcoin (8 decimals)\n- `WETH` - Wrapped Ethereum (18 decimals)\n- `WSOL` - Wrapped Solana (9 decimals)\n- `WAVAX` - Wrapped Avalanche (18 decimals)\n- `WPOL` - Wrapped Polygon (18 decimals)\n\n**Native Token:**\n\n- `NATIVE` - Resolves to chain's native gas token (ETH on Ethereum, SOL on Solana, etc.)\n\n**Important:** At least one token (input OR output) must be from the supported list. Non-supported → Non-supported swaps are not allowed.\n\n**Examples:**\n\n```typescript\n// Swap between 6-decimal stablecoins\nawait kit.swap({\n from: { adapter, chain: 'Ethereum' },\n tokenIn: 'EURC',\n tokenOut: 'USDC',\n amountIn: '100.50',\n config: { apiKey: process.env.CIRCLE_API_KEY },\n})\n\n// Swap DAI (18 decimals) to USDC\nawait kit.swap({\n from: { adapter, chain: 'Ethereum' },\n tokenIn: 'DAI',\n tokenOut: 'USDC',\n amountIn: '500.0', // Automatically handles 18-decimal precision\n config: { apiKey: process.env.CIRCLE_API_KEY },\n})\n\n// Swap native gas token to stablecoin (generic)\nawait kit.swap({\n from: { adapter, chain: 'Ethereum' },\n tokenIn: 'NATIVE', // ETH on Ethereum, POL on Polygon, SOL on Solana, etc.\n tokenOut: 'USDC',\n amountIn: '1.5',\n config: { apiKey: process.env.CIRCLE_API_KEY },\n})\n\n// Swap wrapped ETH to stablecoin on Polygon\nawait kit.swap({\n from: { adapter, chain: 'Polygon' },\n tokenIn: 'WETH', // Wrapped ETH on Polygon\n tokenOut: 'USDC',\n amountIn: '0.5',\n config: { apiKey: process.env.CIRCLE_API_KEY },\n})\n```\n\n**Note:** Use `NATIVE` for the chain's native gas token. Chain-specific symbols like `ETH`, `POL` are not supported as swap token aliases — use `NATIVE` or contract addresses instead.\n\n## Type Definitions\n\n### SwapParams\n\n```typescript\ninterface SwapParams {\n from: AdapterContext // Source adapter and chain\n tokenIn: SupportedToken // Input token\n tokenOut: SupportedToken // Output token\n amountIn: string // Decimal string (e.g., '10.5')\n config?: SwapConfig // Optional configuration\n}\n\n// SupportedToken can be:\n// - Stablecoin aliases (6 decimals): 'USDC' | 'EURC' | 'USDT' | 'PYUSD'\n// - Stablecoin aliases (18 decimals): 'DAI' | 'USDE'\n// - Wrapped tokens: 'WBTC' (8 dec) | 'WETH' | 'WSOL' (9 dec) | 'WAVAX' | 'WPOL' (18 dec)\n// - Native token: 'NATIVE' (chain's native gas token)\ntype SupportedToken =\n | 'USDC'\n | 'EURC'\n | 'USDT'\n | 'USDE'\n | 'DAI'\n | 'PYUSD'\n | 'WBTC'\n | 'WETH'\n | 'WSOL'\n | 'WAVAX'\n | 'WPOL'\n | 'NATIVE'\n```\n\n### SwapEstimate\n\nThe estimate result includes input context fields for correlating estimates with inputs:\n\n```typescript\ninterface SwapEstimate {\n // Input context (populated from your params)\n tokenIn: SupportedToken // e.g., 'NATIVE'\n tokenOut: SupportedToken // e.g., 'USDC'\n amountIn: string // e.g., '0.00001'\n chain: string // e.g., 'Ethereum'\n fromAddress: string // e.g., '0x2971...5EE9f'\n toAddress: string // e.g., '0x2971...5EE9f'\n\n // Estimate details\n transaction: object // Raw transaction to sign and submit\n stopLimit: string // Minimum output in base units\n estimatedOutput?: string // Human-readable expected output\n fees?: ServiceSwapFee[] // Fee breakdown\n}\n```\n\n### SwapResult\n\nThe swap result uses a simplified chain field:\n\n```typescript\ninterface SwapResult {\n tokenIn: SupportedToken\n tokenOut: SupportedToken\n chain: string // e.g., 'Ethereum'\n amountIn: string // Human-readable amount\n fromAddress: string\n toAddress: string\n txHash: string\n explorerUrl?: string\n fees?: ServiceSwapFee[]\n config?: SwapResultConfig\n}\n```\n\n### Resolving Chain Name to ChainDefinition\n\nBoth `SwapEstimate` and `SwapResult` return a simplified `chain` string (e.g., `'Ethereum'`)\nIf you need the full chain definition, use the `getChainByEnum` utility:\n\n```typescript\nimport { getChainByEnum } from '@circle-fin/swap-kit'\n\n// After getting a swap result or estimate\nconst result = await kit.swap(params)\n\n// Resolve the chain name back to full ChainDefinition\nconst chainDef = getChainByEnum(result.chain)\nconsole.log(chainDef.chainId) // 1 (for Ethereum)\nconsole.log(chainDef.rpcEndpoints) // ['https://...']\n```\n\n### CustomFeePolicy\n\n```typescript\ninterface CustomFeePolicy {\n computeFee: (params: SwapParams) => Promise | string\n resolveFeeRecipientAddress: (\n chain: ChainDefinition,\n params: SwapParams,\n ) => Promise | string\n}\n```\n\n## Validation\n\nSwapKit provides comprehensive runtime validation:\n\n```typescript\nimport { assertSwapParams, swapParamsSchema } from '@circle-fin/swap-kit'\n\ntry {\n assertSwapParams(params, swapParamsSchema)\n // Parameters are valid\n} catch (error) {\n console.error('Validation failed:', error.message)\n}\n```\n\n## Usage Patterns: Class vs Functional\n\nSwapKit supports both class-based and functional programming styles. Choose based on your preferences:\n\n### Use Class-Based (SwapKit) When:\n\n- ✅ You prefer traditional class-based patterns\n- ✅ Your codebase already uses class-based libraries\n- ✅ You want a familiar API similar to other SDKs\n- ✅ You don't need aggressive tree-shaking optimizations\n\n### Use Functional (createSwapKitContext + operations) When:\n\n- ✅ You prefer functional programming patterns\n- ✅ You need maximum tree-shaking for smaller bundles\n- ✅ You want to import only specific operations\n- ✅ You're building a performance-critical application\n\nBoth approaches:\n\n- ✅ Provide identical functionality\n- ✅ Use the same underlying operations\n- ✅ Offer full TypeScript support\n- ✅ Include comprehensive validation\n\n**Example: Choosing an approach**\n\n```typescript\n// Class-based: Great for general use\nimport { SwapKit } from '@circle-fin/swap-kit'\nconst kit = new SwapKit()\nawait kit.swap(params)\n\n// Functional: Great for tree-shaking\nimport { createSwapKitContext, swap } from '@circle-fin/swap-kit'\nconst context = createSwapKitContext()\nawait swap(context, params)\n```\n\n## License\n\nApache-2.0\n\n## Support\n\nFor issues and questions, please visit the [GitHub repository](https://github.com/circlefin/stablecoin-kits).\n","readmeFilename":"README.md"}