Description
Complete Base development playbook. Covers: (1) Network — Base RPC URLs, chain IDs (8453/84532), explorer config, testnet setup, connect to Base, Base Sepolia; (2) Contracts — Foundry deployment, forge create, BaseScan verification, CDP faucet, testnet ETH, deploy contract to Base; (3) Builder Codes — ERC-8021 attribution suffix, referral fees, dataSuffix for Wagmi/Viem/Privy/ ethers.js/window.ethereum, transaction attribution, earn referral fees, append builder code; (4) Base Account SDK — Sign in with Base (SIWB), Base Pay, USDC payments, paymasters, gas sponsorship, sub-accounts, spend permissions, prolinks, batch transactions, smart wallet, payment link, recurring subscription; (5) Agent registration — trading bots, AI agents, automated senders, ERC-8021 attribution wiring, base.dev API, register agent, builder code registration; (6) Node operation — run Base node, Reth setup, hardware requirements, self-hosted RPC, sync; (7) Migrations — migrate OnchainKit, OnchainKitProvider to WagmiProvider, wagmi migration, remove onchainkit dependency, MiniKit to Farcaster SDK, convert miniapp, Farcaster miniapp to regular app, convert Farcaster miniapp.
SKILL.md
Base Development
Complete playbook for building on Base L2 — network setup, smart contracts, wallet auth, payments, developer tool attribution, and framework migrations.
Default Stack
| Layer | Default |
|---|---|
| Network | Base Mainnet (8453) / Base Sepolia testnet (84532) |
| Contracts | Foundry (forge create + BaseScan verification) |
| Wallet auth | Base Account SDK (@base-org/account) |
| Payments | Base Pay — USDC, gasless, settles in <2s |
| Transactions | wagmi + viem |
| Attribution | Builder Codes — ERC-8021 via ox/erc8021 |
| RPC (prod) | Dedicated node provider or self-hosted Reth |
Safety Guardrails
- Never commit private keys — use
cast wallet importfor Foundry keystores - Never expose RPC API keys or CDP credentials client-side — proxy through backend
- Never skip server-side payment verification — always call
getPaymentStatus()server-side and verifysender,amount,recipient; track processed tx IDs to prevent replay attacks - Never send transactions without Builder Code attribution — silent data loss, no errors, no warnings
- Validate all user-provided shell inputs before constructing forge/cast commands (no spaces, semicolons, pipes)
- COOP headers for Base Account popups — use
same-origin-allow-popups, notsame-origin
Task Routing
Read the reference for your task:
| Task | When to Use | Reference |
|---|---|---|
| Network config | RPC URLs, chain IDs, explorer links, testnet setup | references/network.md |
| Deploy contracts | Foundry deployment, BaseScan verification, faucet | references/deploy-contracts.md |
| Run a Base node | Self-hosted RPC, Reth, hardware requirements | references/run-node.md |
| Builder Codes | Add ERC-8021 attribution to transactions | references/builder-codes/overview.md |
| Base Account SDK | SIWB, Base Pay, subscriptions, sub-accounts | references/base-account/overview.md |
| Register AI agent/bot | Register wallet, get builder code, wire attribution | references/agents/register.md |
| Migrate from OnchainKit | OnchainKitProvider → wagmi, wallet/tx components | references/migrations/onchainkit/overview.md |
| MiniKit → Farcaster SDK | @coinbase/onchainkit/minikit → @farcaster/miniapp-sdk | references/migrations/minikit-to-farcaster/overview.md |
| Farcaster miniapp → regular app | Remove Mini App host coupling, convert to Base/web app | references/migrations/farcaster-miniapp-to-app.md |
Operating Procedure
- Classify the task using the table above
- Read the relevant reference before implementing
- Confirm the framework with the user when multiple options exist (e.g., Privy vs wagmi for Builder Codes)
- Implement with explicit chain ID, security requirements, and all required validations
- Deliver diffs, install commands, and any manual steps (env vars, API key setup, wallet registration)
For Edge Cases and Latest API Changes
- AI-optimized docs: docs.base.org/llms.txt
- Base Account reference: docs.base.org/base-account
- Base chain docs: docs.base.org
Installation
npx skills add base/skills --skill build-on-base