Agents API

Manage agents within your tenant. Each agent gets encrypted EVM and Solana wallets on creation.

Create Agent

Creates an agent with encrypted wallet keypairs.

POST /agents

Auth: Tenant API key Request Body:

{
  id: string;        // Unique agent ID (1-128 alphanumeric, _ - . :)
  name: string;      // Display name
  platformId?: string; // Optional external platform ID
}

Response:

{
  "ok": true,
  "data": {
    "id": "my-agent",
    "name": "My Trading Agent",
    "tenantId": "your-tenant",
    "walletAddresses": {
      "evm": "0x742d35Cc6634C0532925a3b844Bc9e7595f2bD18",
      "solana": "7xKXtg2CW87d97TXJSDpbD5jBkheTqA83TZRuJosgAsU"
    },
    "createdAt": "2026-03-26T12:00:00.000Z"
  }
}

const agent = await steward.createWallet("my-agent", "My Trading Agent");

List Agents

Returns all agents for the authenticated tenant.

GET /agents

Auth: Tenant API key Response:

{
  "ok": true,
  "data": [
    {
      "id": "my-agent",
      "name": "My Trading Agent",
      "tenantId": "your-tenant",
      "walletAddresses": { "evm": "0x742d...", "solana": "7xKXtg..." },
      "createdAt": "2026-03-26T12:00:00.000Z"
    }
  ]
}

const agents = await steward.listAgents();

Get Agent

Returns a single agent by ID.

GET /agents/:agentId

Auth: Tenant API key or agent JWT

const agent = await steward.getAgent("my-agent");

Delete Agent

Permanently deletes an agent and all associated data (wallets, policies, transactions).

DELETE /agents/:agentId

Auth: Tenant API key (agent tokens cannot delete) Response:

{
  "ok": true,
  "data": { "deleted": "my-agent" }
}

This cascades: encrypted keys, wallet entries, policies, transactions, and approval queue items are all deleted. This cannot be undone.

curl -X DELETE https://api.steward.fi/agents/my-agent \
  -H "X-Steward-Key: your-key"

Generate Agent Token

Creates a scoped JWT for agent-level operations.

POST /agents/:agentId/token

Auth: Tenant API key (agents cannot generate their own tokens) Request Body:

{
  expiresIn?: string; // JWT expiry (e.g., "24h", "7d"). Default: "24h"
}

Response:

{
  "ok": true,
  "data": {
    "token": "eyJhbGciOiJIUzI1NiIs...",
    "agentId": "my-agent",
    "tenantId": "your-tenant",
    "scope": "agent",
    "expiresIn": "24h"
  }
}

curl -X POST https://api.steward.fi/agents/my-agent/token \
  -H "X-Steward-Key: your-key" \
  -H "Content-Type: application/json" \
  -d '{"expiresIn": "24h"}'

Get Account

Returns the agent’s aggregated digital-asset account, including wallet rows, native balance, token portfolio assets, USD totals when pricing is configured, spend summary, signing capabilities, and gas sponsorship state.

GET /agents/:agentId/account?chainId=8453&tokens=0xUSDC,0xDAI

Auth: Agent JWT or tenant key Response:

{
  "ok": true,
  "data": {
    "id": "my-agent",
    "type": "agent",
    "agentId": "my-agent",
    "walletAddress": "0x742d35Cc...",
    "wallets": [{ "chainFamily": "evm", "address": "0x742d35Cc..." }],
    "portfolio": {
      "chainId": 8453,
      "native": { "symbol": "ETH", "formatted": "1.0", "usdValueText": "3000" },
      "tokens": [],
      "totalUsdText": "3000"
    },
    "capabilities": ["sign_transaction", "sign_message", "transfer"],
    "sponsorship": { "enabled": false }
  }
}

const account = await steward.getAgentAccount("my-agent", {
  chainId: 8453,
  tokens: ["0xUSDC..."],
});

Get Balance

Returns the native token balance for an agent’s wallet.

GET /agents/:agentId/balance?chainId=8453

Auth: Agent JWT or tenant key Response:

{
  "ok": true,
  "data": {
    "agentId": "my-agent",
    "walletAddress": "0x742d35Cc...",
    "balances": {
      "native": "1000000000000000000",
      "nativeFormatted": "1.0",
      "chainId": 8453,
      "symbol": "ETH"
    }
  }
}

const balance = await steward.getBalance("my-agent", 8453);

Get Token Balances

Returns ERC-20 token balances for an agent’s wallet.

GET /agents/:agentId/tokens?chainId=8453&tokens=0xUSDC,0xDAI

Auth: Agent JWT or tenant key Response:

{
  "ok": true,
  "data": {
    "agentId": "my-agent",
    "walletAddress": "0x742d35Cc...",
    "chainId": 8453,
    "native": {
      "symbol": "ETH",
      "balance": "1000000000000000000",
      "formatted": "1.0"
    },
    "tokens": [
      { "address": "0xUSDC...", "symbol": "USDC", "balance": "1000000", "formatted": "1.0" }
    ]
  }
}

Authorization Keys and Key Quorums

Agent signers model owners, delegated signers, service signers, and quorum members for an agent wallet. A signer with keyType: "p256" and a registered publicKey is Steward’s Privy-style asymmetric authorization key. A signer with keyType: "hmac" can instead receive a one-time delegated credential secret when created with issueCredential: true.

GET /agents/:agentId/signers?status=active
POST /agents/:agentId/signers
PATCH /agents/:agentId/signers/:signerId
DELETE /agents/:agentId/signers/:signerId

Auth: Owner/admin browser session. Create, revoke, and authority-changing updates require recent MFA. Signer request body:

{
  signerType: "owner" | "delegated" | "service" | "quorum_member";
  subjectType: "user" | "wallet" | "api_key" | "external";
  subjectId: string;
  keyType?: "hmac" | "p256"; // default: "hmac"
  publicKey?: string | null; // required for keyType: "p256"
  address?: string | null;
  chainFamily?: "evm" | "solana" | null;
  label?: string | null;
  permissions?: string[];
  policyIds?: string[]; // policy rule ids on this same agent
  metadata?: Record<string, unknown>;
  issueCredential?: boolean; // hmac only; returns credentialSecret once
}

const key = await steward.createAuthorizationKey("my-agent", {
  signerType: "delegated",
  subjectType: "external",
  subjectId: "ops-key-1",
  keyType: "p256",
  publicKey: "BASE64_SPKI_P256_PUBLIC_KEY",
  permissions: ["sign_message", "sign_transaction"],
  policyIds: ["policy_daily_limit"],
});

policyIds must reference policy rules on the same agent. Updating a signer’s policy scope is an authority-changing operation and requires recent MFA:

await steward.updateAuthorizationKey("my-agent", key.id, {
  status: "paused",
  policyIds: ["policy_daily_limit", "policy_manual_review"],
});

Signer responses include id, signerType, subjectType, subjectId, keyType, publicKey, permissions, policyIds, status, metadata, hasCredential, and timestamps. credentialSecret is returned only on the create response when issueCredential: true; it is never returned by list or update calls. Key quorums group signer IDs and optional child quorum IDs behind a threshold. Nested quorum verification is bounded and fails closed on cycles or excessive depth.

GET /agents/:agentId/key-quorums?status=active
POST /agents/:agentId/key-quorums
PATCH /agents/:agentId/key-quorums/:quorumId
DELETE /agents/:agentId/key-quorums/:quorumId

const quorum = await steward.createAgentKeyQuorum("my-agent", {
  name: "Treasury approval",
  threshold: 2,
  memberSignerIds: ["signer-a"],
  memberQuorumIds: ["child-quorum-a"],
  permissions: ["sign_transaction"],
});

Batch Create

Create multiple agents in one request with optional shared policies.

POST /agents/batch

Auth: Tenant API key Request Body:

{
  agents: Array<{ id: string; name: string; platformId?: string }>;
  applyPolicies?: PolicyRule[];  // Applied to all created agents
}

Response:

{
  "ok": true,
  "data": {
    "created": [/* AgentIdentity[] */],
    "errors": [/* { id: string, error: string }[] */]
  }
}

const result = await steward.createWalletBatch(
  [
    { id: "agent-1", name: "Agent One" },
    { id: "agent-2", name: "Agent Two" },
  ],
  [{ id: "limit", type: "spending-limit", enabled: true, config: { maxPerDay: "1000000000000000000" } }]
);

​Agents API

​Create Agent

​List Agents

​Get Agent

​Delete Agent

​Generate Agent Token

​Get Account

​Get Balance

​Get Token Balances

​Authorization Keys and Key Quorums

​Batch Create

Agents API

Create Agent

List Agents

Get Agent

Delete Agent

Generate Agent Token

Get Account

Get Balance

Get Token Balances

Authorization Keys and Key Quorums

Batch Create