Skip to main content

​
What is Steward?

Steward is a governance layer for autonomous AI agents. It provides encrypted wallet management, credential storage, policy enforcement, and audit logging — so agents can interact with blockchains and external APIs without ever touching raw private keys or API credentials.

Wallet Vault

AES-256-GCM encrypted key storage with multi-chain signing (EVM + Solana). Agents request signatures — they never see private keys.

Secret Vault

Encrypted credential storage with automatic injection. Agents never see API keys — Steward’s proxy injects them at request time.

Policy Engine

Declarative policies evaluated before every action. Spending limits, rate limits, address whitelists, time windows — all configurable per agent.

Audit Logging

Every signing request, every API call, every policy decision is logged. Immutable, queryable, exportable.

​
The Problem

Today, most agent platforms inject plaintext credentials directly into agent containers: 
# What agent containers look like today 😬
OPENAI_API_KEY=sk-proj-abc123...
ANTHROPIC_API_KEY=sk-ant-def456...
EVM_PRIVATE_KEY=0xdeadbeef...
DATABASE_URL=postgres://user:pass@host/db
Any code running inside the container — including code triggered by prompt injection — can read these credentials, exfiltrate them, or drain wallets. There’s no spending control, no audit trail, and rotating a credential means redeploying every container that uses it.

​
The Solution

With Steward, agent containers only receive two environment variables: 
# What agent containers look like with Steward ✅
STEWARD_PROXY_URL=http://steward-proxy:8080
STEWARD_AGENT_TOKEN=stwd_jwt_...
Every API call and every transaction flows through Steward, where it’s authenticated, policy-checked, logged, and metered before being forwarded with the real credentials injected.

​
Who Uses Steward?

  • Milady Cloud — Production deployment managing 17+ AI agents across 6 nodes with on-chain transactions on Base mainnet.
  • Agent developers — Anyone building autonomous agents that need wallet access or API credential management.
  • Platform operators — Teams running multi-tenant agent hosting who need security, cost control, and compliance.

Quickstart

Get up and running with Steward in 5 minutes.

Architecture

Understand how the three pillars work together.

SDK Reference

Install the TypeScript SDK and start building.

API Reference

Explore the full REST API.