base/build-on-base
skills/build-on-base/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add base/skills build-on-baseInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: May 27, 2026, 3:08 AM288.7s36 files scanned
SKILL.md
- name:
- build-on-base
- description:
- >
- Complete Base development playbook. Covers:
- (1) Network — Base RPC URLs, chain IDs (8453/84532),
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
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