SIWA SDK
Sign-In With Agent (SIWA) lets AI agents authenticate with services using their ERC-8004 onchain identity.
Install
npm install @buildersgarden/siwa
Skills
Agent-Side (Signing)
Choose based on your wallet provider:
- Bankr — Bankr Agent API wallets
Server-Side (Verification)
- Server-Side Verification — Next.js, Express, Hono, Fastify
SDK Modules
| Import | Description |
|--------|-------------|
| @buildersgarden/siwa | Core: signSIWAMessage, verifySIWA, createSIWANonce |
| @buildersgarden/siwa/signer | Signer factories |
| @buildersgarden/siwa/erc8128 | ERC-8128 HTTP signing/verification |
| @buildersgarden/siwa/receipt | HMAC receipt helpers |
| @buildersgarden/siwa/nonce-store | Nonce stores (Memory, Redis, KV) |
| @buildersgarden/siwa/next | Next.js middleware |
| @buildersgarden/siwa/express | Express middleware |
| @buildersgarden/siwa/hono | Hono middleware |
| @buildersgarden/siwa/fastify | Fastify middleware |