JAW SDK Best Practices

Guide for building applications with the JAW SDK passkey-authenticated smart accounts on EVM chains with programmable permissions.

When to use

Reference these guidelines when:

• Installing or setting up @jaw.id/wagmi, @jaw.id/core, or @jaw.id/ui
• Configuring the JAW connector or provider (API key, modes, paymasters, ENS)
• Connecting/disconnecting wallets with passkey authentication
• Sending transactions (single or batched) through JAW smart accounts
• Signing messages or typed data (EIP-191, EIP-712, ERC-7871)
• Granting, querying, or revoking permissions (ERC-7715)
• Implementing subscription payments or recurring charges
• Setting up gas sponsoring with paymasters (ERC-7677)
• Issuing ENS subnames to users during onboarding
• Implementing Sign-In With Ethereum (SIWE)
• Building headless integrations, server-side operations, or AI agent wallets
• Using the Account class directly (no UI)
• Building stablecoin payment flows (USDC gas, batch payouts)
• Choosing between CrossPlatform and AppSpecific authentication modes
• Implementing a custom UI handler for app-specific mode
• Reviewing or debugging code that uses JAW SDK

Key facts

• Packages: @jaw.id/wagmi (React), @jaw.id/core (vanilla JS / server), @jaw.id/ui (app-specific mode UI)
• API Key: Required. Get one at https://dashboard.jaw.id
• EIP-1193 compatible: Drop-in replacement for MetaMask or any wallet
• Smart accounts: ERC-4337 with passkey signers, gasless tx, batch ops, permissions
• EntryPoint: v0.8 only (for paymasters)

Rule index

1. Setup & Configuration

• <rules/installation.md> – Package installation, peer dependencies, choosing wagmi vs core
• <rules/configuration.md> – All config options: apiKey, appName, ens, mode, paymasters, preference
• <rules/auth-modes.md> – CrossPlatform vs AppSpecific modes and when to use each

2. Wagmi Integration (React)

• <rules/wagmi-setup.md> – Wagmi connector setup, providers, using standard wagmi hooks with JAW
• <rules/connect-disconnect.md> – useConnect, useDisconnect, connection with capabilities

3. Core Operations

• <rules/transactions.md> – Sending transactions, batch calls, gas estimation, checking status
• <rules/signing.md> – Personal sign, typed data, unified wallet_sign, cross-chain signing

4. Permissions & Payments

• <rules/permissions.md> – Granting, querying, revoking permissions (ERC-7715)
• <rules/subscription-payments.md> – Recurring subscription payments using permissions
• <rules/stablecoin-payments.md> – Headless USDC payments, batch payouts, ERC-20 gas

5. Identity & Auth

• <rules/ens-identity.md> – ENS subname issuance, profile resolution, text records
• <rules/siwe.md> – Sign-In With Ethereum (SIWE) implementation
• <rules/gas-sponsoring.md> – Paymaster setup, sponsorship policies, multi-chain config

6. Advanced

• <rules/account-api.md> – Headless Account class for AI agents, server-side, embedded wallets
• <rules/custom-ui-handler.md> – Building a custom UIHandler for app-specific mode
• <rules/provider-api.md> – Direct provider RPC methods reference and patterns

7. Reference

• <rules/error-handling.md> – EIP-1193 error codes, common errors, debugging
• <rules/typescript-types.md> – Key TypeScript interfaces and type patterns

How to use

Read individual rule files for detailed guidance. Each contains: correct usage examples, common mistakes to avoid, and critical requirements.