Steward

Auth + wallet infrastructure for autonomous agents. Open source. Self-hostable. Policy-enforced at the signing layer.

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The Problem

AI agents need wallet keys, API keys, database credentials. Today these live as plaintext environment variables, one prompt injection away from exfiltration. No spending controls, no audit trail, no kill switch.

Auth platforms like Privy were built for consumer apps, not agents. They're closed source, can't be self-hosted, charge per-transaction fees, and have no concept of policy enforcement or autonomous operation.

The Solution

Steward sits between agents and everything they access. Four pillars:

1. Vault — AES-256-GCM encrypted keys. EVM (7 chains) + Solana. Keys never exist in plaintext outside a signing operation.
2. Policy Engine — 6 composable rule types evaluated before every action. Spending limits, rate limits, address whitelists, time windows, auto-approve thresholds.
3. Auth — Passkeys, email magic links, SIWE, Google/Discord OAuth. JWT sessions with refresh token rotation.
4. Proxy Gateway — Credential injection for any third-party API. Agents never see raw keys. Full audit trail.

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Architecture

Agent / App              Steward                        External
┌─────────────┐    ┌──────────────────────┐    ┌──────────────────┐
│ STEWARD_URL │───>│ Auth (JWT/passkey)   │    │ Chains (EVM/Sol) │
│ STEWARD_JWT │    │ Policy Engine        │───>│ OpenAI/Anthropic  │
│             │    │ Wallet Vault         │    │ Any API           │
│ No API keys │    │ Secret Vault         │    └──────────────────┘
│ No priv keys│    │ Proxy Gateway        │
└─────────────┘    │ Audit Log            │
                   └──────────────────────┘

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Quick Start

npm install @stwd/sdk

import { StewardClient } from "@stwd/sdk";

const steward = new StewardClient({
  baseUrl: "https://api.steward.fi",
  apiKey: "stw_your_tenant_key",
  tenantId: "my-app",
});

// Create an agent with EVM + Solana wallets
const agent = await steward.createWallet("trading-bot", "Trading Bot");
console.log(agent.walletAddresses); // { evm: "0x...", solana: "..." }

// Sign a transaction (policy-enforced)
const result = await steward.signTransaction("trading-bot", {
  to: "0xRecipient",
  value: "10000000000000000", // 0.01 ETH
  chainId: 8453, // Base
});

See the full Quickstart Guide for auth setup, policies, and self-hosting.

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Auth Widget

Drop-in React components for login and wallet management:

npm install @stwd/react @stwd/sdk

import { StewardProvider, StewardLogin, StewardAuthGuard } from "@stwd/react";
import "@stwd/react/styles.css";

function App() {
  return (
    <StewardProvider
      client={stewardClient}
      auth={{ baseUrl: "https://api.steward.fi" }}
    >
      <StewardAuthGuard fallback={<StewardLogin methods={["passkey", "email", "google"]} />}>
        <Dashboard />
      </StewardAuthGuard>
    </StewardProvider>
  );
}

Components: StewardLogin, StewardAuthGuard, StewardUserButton, StewardTenantPicker, WalletOverview, PolicyControls, ApprovalQueue, SpendDashboard, TransactionHistory.

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Packages

Package	Version	Description
@stwd/sdk		TypeScript client for browser + Node. Zero deps.
@stwd/react		Drop-in React components: login, wallet, policies, approvals.
@stwd/eliza-plugin		ElizaOS integration: sign, transfer, balance, approval evaluator.
@stwd/api	—	Hono REST API. 30+ endpoints, multi-tenant, dual auth.
@stwd/vault	—	Wallet + secret encryption. AES-256-GCM, EVM + Solana.
@stwd/policy-engine	—	Composable policy evaluation. 6 rule types, 1000+ lines of tests.
@stwd/proxy	—	API proxy with credential injection, alias system, audit trail.
@stwd/auth	—	Passkeys (WebAuthn), email magic links, SIWE, OAuth.
@stwd/webhooks	—	HMAC-signed event delivery with retries.
@stwd/db	—	Drizzle ORM schema, migrations, PGLite adapter.
@stwd/shared	—	Types, chain metadata, constants.

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Self-Hosting

Steward runs anywhere. Two options:

Docker (recommended for production):

git clone https://github.com/Steward-Fi/steward.git && cd steward
cp .env.example .env
# Set STEWARD_MASTER_PASSWORD and POSTGRES_PASSWORD in .env
docker compose up -d

This starts the API (:3200), proxy (:8080), Postgres, and Redis.

Embedded mode (no third-party dependencies):

bun run start:local

Uses PGLite (in-process Postgres via WASM). Data persists to ~/.steward/data/. Good for local development, CLI agents, and desktop apps.

Required env vars:

Variable	Description
STEWARD_MASTER_PASSWORD	Derives all vault encryption keys. No recovery if lost.
DATABASE_URL	Postgres connection string (not needed in embedded mode)
STEWARD_SESSION_SECRET	JWT signing secret (defaults to master password)
REDIS_URL	Redis for rate limiting + token store (optional)
RESEND_API_KEY	For email magic link auth (optional)
PASSKEY_RP_ID	WebAuthn relying party domain (optional)
GOOGLE_CLIENT_ID / GOOGLE_CLIENT_SECRET	Google OAuth (optional)
DISCORD_CLIENT_ID / DISCORD_CLIENT_SECRET	Discord OAuth (optional)

Full list in .env.example. See Deployment Guide for production setup.

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Features

• Vault: AES-256-GCM encrypted wallets, EVM (7 chains) + Solana
• Policy Engine: 6 composable types (spending-limit, approved-addresses, rate-limit, time-window, auto-approve-threshold, allowed-chains)
• Auth: Passkeys (WebAuthn), email magic links, SIWE, Google OAuth, Discord OAuth
• JWT Sessions: Access + refresh token rotation, revoke single/all sessions
• Cross-Tenant Identity: One user, one wallet, multiple apps
• Multi-Tenant API: Full tenant isolation at middleware + DB level
• Proxy Gateway: Credential injection, alias system, spend tracking, audit trail
• React Components: Login widget, wallet overview, policy controls, approval queue
• TypeScript SDK: Typed client, browser + Node, all wallet/policy/auth ops
• ElizaOS Plugin: Sign, transfer, balance, approval evaluator
• Embedded Mode: PGLite, zero third-party dependencies, same API surface
• Docker: Multi-stage Dockerfile, docker-compose with Postgres + Redis
• Webhooks: HMAC-signed events (tx.signed, tx.pending, policy.violation, etc.)
• Per-Tenant CORS: Configurable allowed origins per tenant

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Competitive Landscape

	Steward	Privy (Stripe)	Vincent (Lit)	Turnkey	Crossmint	AgentKit (Coinbase)
Open Source	✅ MIT	❌	✅	❌	❌	✅
Self-Hostable	✅	❌	❌ (needs Lit network)	❌	❌	✅
Auth	✅ Passkey/email/SIWE/OAuth	✅ All methods	❌	❌	❌	❌
Policy Enforcement	✅ 6 types, vault-level	Partial (app-layer)	✅ On-chain	❌	✅	❌
Agent-Native	✅	Bolted on	✅	Partial	✅	✅
Credential Proxy	✅	❌	❌	❌	❌	❌

Steward is the only platform that checks all six boxes. The proxy gateway (credential injection for any API, not just wallets) is unique.

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Supported Chains

Ethereum · Base · Polygon · Arbitrum · BSC · Base Sepolia · BSC Testnet · Solana

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Building With

ElizaOS · Milady · Babylon · Hyperscape · Strata Reserve

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Contributing

See CONTRIBUTING.md for development setup, coding standards, and PR guidelines.

Links

• Website: steward.fi
• Docs: docs.steward.fi
• API: api.steward.fi
• npm: @stwd/sdk · @stwd/react · @stwd/eliza-plugin

License

MIT