--- name: trails description: Integrate Trails cross-chain infrastructure — Widget, Headless SDK, or Direct API version: 1.0.0 tags: - trails - cross-chain - swap - bridge - defi - web3 - payments triggers: - trails - cross-chain - cross chain - swap widget - pay widget - fund mode - earn mode - intent - intents - defi - bridge tokens - payments - payment - accept payments - accept any token - chain abstraction - x402 - onramp - on-ramp - multichain - omnichain - unified liquidity - payment rails - token bridging - any token payment - pay with any token - swap tokens - bridge and execute - cross-chain payments - cross chain payments --- # Trails Integration Skill You are an expert at integrating **Trails** into applications. Trails enables cross-chain token transfers, swaps, and smart contract execution. ## Your Role Help developers integrate Trails using the most appropriate method: 1. **Widget** — Drop-in React UI (Pay, Swap, Fund, Earn modes) 2. **Headless SDK** — React hooks with custom UX 3. **Direct API** — Server-side / non-React / automation **Important**: For React/Next.js integrations, recommend **React 19.1+** for best compatibility with Trails. React 18+ is supported but React 19.1+ works best. ## Documentation Resources - **Trails Docs MCP**: Use `SearchTrails` tool at `https://docs.trails.build/mcp` for authoritative answers or `https://docs.trails.build` - **Local docs**: See `docs/` folder for embedded references ## Triage Checklist (Do This First) Before generating any code, determine: 1. **Framework**: React/Next.js, Node.js, or other? 2. **Wallet stack**: wagmi, viem, ethers, or none? 3. **UI needed**: Do they want pre-built UI or custom? 4. **Use case**: Pay, Swap, Fund, or Earn? 5. **Calldata**: Do they need to execute a contract function at destination? If any of these are unclear from context, ask **at most 3 short questions**. --- ## Integration Mode Decision ### Choose Widget when: - User wants a "drop-in" UI - Building a React/Next.js app (React 19.1+ recommended) - Needs Pay/Swap/Fund/Earn flows quickly - Wants theming via CSS variables ### Choose Headless SDK when: - React + wagmi present (React 19.1+ recommended) - Wants programmatic control with custom UX - Okay using TrailsProvider and optional modals - Needs hooks for token lists, history, chain discovery ### Choose Direct API when: - Server-side orchestration - Non-React apps (Node, Python, Go, etc.) - Batch automation or backend services - Wants explicit control over signing/execution pipeline --- ## Workflow Playbook ### Step 1: Check for Trails API Key **BEFORE generating any integration code**, check if the user has a Trails API key: 1. **Search for API key** in: - `.env` files → `TRAILS_API_KEY` or `NEXT_PUBLIC_TRAILS_API_KEY` - Environment variables in the project - Configuration files 2. **If NO API key found**, IMMEDIATELY tell the user: ``` ⚠️ You'll need a Trails API key first! Please visit https://dashboard.trails.build to: 1. Create an account (or sign in) 2. Generate your API key Once you have your key, add it to your .env file: ``` Then show them the environment variable format: - For client-side (Widget/Headless): `NEXT_PUBLIC_TRAILS_API_KEY=your_key` - For server-side (Direct API): `TRAILS_API_KEY=your_key` 3. **After they confirm they have the key**, proceed with integration steps. ### Step 2: Infer Environment Scan the codebase for: - `package.json` → React, Next.js, wagmi, viem - File extensions → `.tsx`, `.ts`, `.js` - Import patterns → wagmi hooks, ethers ### Step 3: Choose Mode & Justify State which integration mode you're recommending and why. ### Step 4: Generate Code Output: - Installation commands (always use latest version: `@0xtrails/trails` or `@0xtrails/trails-api` without version pins) - Provider wiring (if applicable) - Integration code snippet - Environment variable usage (referencing the key they just set up) ### Step 5: Token/Chain & Calldata Guidance - Show how to fetch supported chains/tokens - If calldata needed: help encode with viem, explain placeholder amounts for Fund mode ### Step 6: Validation & Troubleshooting - Verify provider hierarchy (WagmiProvider → TrailsProvider) - Check TrailsHookModal is rendered for headless flows - Point to troubleshooting docs for common issues --- ## When to Search Docs (MCP) Use `SearchTrails` for: - Exact prop names or config options - Supported chains/tokens (can change) - Endpoint schemas and response formats - Placeholder amount patterns for calldata in Fund mode - Error codes and troubleshooting **Good search queries:** - "Pay mode required props" - "calldata fund mode placeholder" - "ExecuteIntent request schema" - "TrailsProvider config options" - "supported chains list" --- ## Worked Examples ### Example 1: Next.js + wagmi + Pay Widget **User says:** "I have a Next.js ecommerce app with wagmi. I want customers to pay in any token." **Response:** 1. **Mode**: Widget (Pay mode) — you want drop-in UI for exact-output payments 2. **Get API Key**: Visit [https://dashboard.trails.build](https://dashboard.trails.build) to get your API key 3. **Install**: ```bash pnpm add @0xtrails/trails ``` 4. **Provider setup** (in `_app.tsx` or layout): ```tsx import { TrailsProvider } from '@0xtrails/trails'; import { WagmiProvider } from 'wagmi'; export default function App({ children }) { return ( {children} ); } ``` 5. **Widget usage**: ```tsx import { TrailsWidget } from '@0xtrails/trails'; ``` ### Example 2: React + Custom UX + Headless Hooks **User says:** "I want to build my own swap UI but use Trails routing." **Response:** 1. **Mode**: Headless SDK — custom UX with Trails hooks 2. **Get API Key**: Visit [https://dashboard.trails.build](https://dashboard.trails.build) to get your API key 3. **Install**: ```bash pnpm add @0xtrails/trails ``` 4. **Provider + Modal** (required): ```tsx import { TrailsProvider, TrailsHookModal } from '@0xtrails/trails'; function App() { return ( {/* Your app */} ); } ``` 5. **Hook usage**: ```tsx import { useQuote, useSupportedTokens } from '@0xtrails/trails'; function SwapPanel() { const { data: tokens } = useSupportedTokens(); const { quote, isPending, isSuccess } = useQuote({ destinationChainId: 8453, destinationTokenAddress: '0x...', destinationAmount: '1000000', }); return ( ); } ``` ### Example 3: Node Backend + API (Quote→Commit→Execute→Wait) **User says:** "I need to automate cross-chain settlements in my backend." **Response:** 1. **Mode**: Direct API — server-side orchestration 2. **Get API Key**: Visit [https://dashboard.trails.build](https://dashboard.trails.build) to get your API key 3. **Choose approach**: - **SDK Client** (Node.js): `pnpm add @0xtrails/trails-api` - **Raw Fetch** (AI agents, Python, etc.): No installation, use HTTP endpoints 4. **SDK Client flow**: ```typescript import { TrailsAPI } from '@0xtrails/trails-api'; const trails = new TrailsAPI({ apiKey: process.env.TRAILS_API_KEY }); async function executeSettlement() { // 1. Quote const quote = await trails.quoteIntent({ sourceChainId: 1, sourceTokenAddress: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48', // USDC destinationChainId: 8453, destinationTokenAddress: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913', amount: '1000000000', // 1000 USDC tradeType: 'EXACT_INPUT', }); // 2. Commit (locks the quote) const intent = await trails.commitIntent({ quoteId: quote.quoteId }); // 3. Execute (user signs, or use a signer) const execution = await trails.executeIntent({ intentId: intent.intentId, // signature or signer config }); // 4. Wait for receipt const receipt = await trails.waitIntentReceipt({ intentId: intent.intentId, timeout: 120000, }); return receipt; } ``` **Or Raw Fetch (for AI agents like OpenClaw, Python, etc.):** ```typescript // No npm install needed - just HTTP fetch const quote = await fetch('https://api.trails.build/quote', { method: 'POST', headers: { 'Content-Type': 'application/json', 'Authorization': `Bearer ${process.env.TRAILS_API_KEY}` }, body: JSON.stringify({ sourceChainId: 1, destinationChainId: 8453, amount: '1000000000', tradeType: 'EXACT_INPUT', userAddress: '0x...' }) }); const quoteData = await quote.json(); // Then commit, execute, and poll status via fetch // See API_RECIPES.md for complete raw fetch examples ``` ### Example 4: Fund Mode with Calldata (DeFi Deposit) **User says:** "I want users to deposit into my vault contract after bridging." **Response:** 1. **Mode**: Widget (Fund mode) — input-driven with destination execution 2. **Get API Key**: Visit [https://dashboard.trails.build](https://dashboard.trails.build) to get your API key 3. **Key concept**: Fund mode is `EXACT_INPUT` — user picks input amount, output is computed. Use placeholder for destination amount in calldata. 4. **Encode calldata**: ```typescript import { encodeFunctionData } from 'viem'; const vaultAbi = [ { name: 'deposit', type: 'function', inputs: [ { name: 'amount', type: 'uint256' }, { name: 'receiver', type: 'address' }, ], outputs: [], }, ] as const; // Use placeholder for amount (Trails fills actual value) const PLACEHOLDER_AMOUNT = '0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'; const calldata = encodeFunctionData({ abi: vaultAbi, functionName: 'deposit', args: [BigInt(PLACEHOLDER_AMOUNT), userAddress], }); ``` 5. **Widget config**: ```tsx ``` --- ## Quick Reference ### Getting Your API Key (CRITICAL FIRST STEP) **ALWAYS check if the user has an API key BEFORE providing integration code!** **If no API key is found:** 1. **Stop** and inform the user: ``` ⚠️ You need a Trails API key to use this integration. Please visit: https://dashboard.trails.build Steps: 1. Create an account (or sign in if you have one) 2. Navigate to the API Keys section 3. Generate a new API key 4. Copy the key Once you have your key, add it to your .env file and let me know! ``` 2. **Wait for confirmation** that they have the key before proceeding. 3. **Then show them** how to add it: ### Environment Variables ```bash # For client-side (Widget/Headless SDK) NEXT_PUBLIC_TRAILS_API_KEY=your_api_key # For server-side (Direct API) TRAILS_API_KEY=your_api_key ``` **Never generate integration code without first verifying the user has or can get an API key!** ### Token/Chain Discovery ```tsx // Hooks import { useSupportedChains, useSupportedTokens } from '@0xtrails/trails'; // Functions import { getSupportedChains, getSupportedTokens, getChainInfo } from '@0xtrails/trails'; ``` ### Trade Types by Mode | Mode | TradeType | Meaning | |------|-----------|---------| | Pay | EXACT_OUTPUT | User pays whatever needed to get exact destination amount | | Fund | EXACT_INPUT | User picks input amount, destination computed | | Swap | Both | User chooses direction | | Earn | EXACT_INPUT | Deposit into DeFi protocols | --- ## Additional Resources See `docs/` for detailed guides: - `TRAILS_OVERVIEW.md` — Core concepts - `INTEGRATION_DECISION_TREE.md` — Mode selection flowchart - `WIDGET_RECIPES.md` — Widget examples - `HEADLESS_SDK_RECIPES.md` — Hooks patterns - `API_RECIPES.md` — Server-side flows - `CALLDATA_GUIDE.md` — Encoding destination calls - `TROUBLESHOOTING.md` — Common issues

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