SDK API Mode

The Stratos SDK supports two transport modes: iframe (default, for dock apps) and api (for bots, scripts, and server-side integrations).

Setup

npm install @stratos-wallet/sdk

import { StratosSDK } from '@stratos-wallet/sdk';

const sdk = new StratosSDK({
  mode: 'api',
  baseUrl: 'https://your-portal.example.com',
  apiKey: 'cws_...',
  apiSecret: '...',
});

Authentication

API mode requires two credentials:

Header	Purpose
X-API-Key	Identity — cws_ prefixed, hash stored in DB
X-API-Secret	Decryption — hex-encoded 32-byte secret, never stored on server

Both are generated during the "Enable API Access" flow when adding a passkey.

Security: The server never sees your cleartext private keys. Keys are encrypted client-side with your API secret before being stored. The server decrypts them only when you provide the secret in each request.

Creating an API Key

1. Open Settings in the wallet
2. Click "Add Passkey"
3. Check "Enable API Access (SDK signing)"
4. Complete the passkey registration
5. Save both the API Key and API Secret — they are shown once

Endpoints

Read Operations

// Get wallet addresses for all chains
const addresses = await sdk.getAddresses();

// Get Canton CC and token balances
const balance = await sdk.getBalance('CC');

// Get transaction history
const txs = await sdk.getTransactions();

Transfers

// Canton CC transfer
await sdk.transfer({
  to: 'recipient-party-id',
  amount: '10.5',
  symbol: 'CC',
  chain: 'canton'
});

// Canton USDC transfer
await sdk.transfer({
  to: 'recipient-party-id',
  amount: '100',
  symbol: 'USDC',
  chain: 'canton'
});

Transaction Signing

// Sign a message hash (secp256k1 chains: EVM, BTC, TRON)
const sig = await sdk.signMessage({
  message: 'Hello World',
  chain: 'evm'
});

Canton Contract Operations

// Query contracts
const contracts = await sdk.cantonQuery({
  templateId: 'package:Module:Template'
});

// Create a contract
const result = await sdk.cantonCreate({
  templateId: 'package:Module:Template',
  payload: { field1: 'value1' }
});

// Exercise a choice
const exerciseResult = await sdk.cantonExercise({
  contractId: '#1:0',
  templateId: 'package:Module:Template',
  choice: 'Archive',
  argument: {}
});

REST API (curl)

If you're not using the SDK, you can call the endpoints directly:

# Get addresses
curl -H "X-API-Key: cws_..." -H "X-API-Secret: ..." \
  https://portal.example.com/api/sdk/addresses

# Transfer CC
curl -X POST \
  -H "X-API-Key: cws_..." -H "X-API-Secret: ..." \
  -H "Content-Type: application/json" \
  -d '{"to":"party-id","amount":10,"symbol":"CC"}' \
  https://portal.example.com/api/sdk/transfer

# Sign a message
curl -X POST \
  -H "X-API-Key: cws_..." -H "X-API-Secret: ..." \
  -H "Content-Type: application/json" \
  -d '{"chainType":"evm","message":"Hello"}' \
  https://portal.example.com/api/sdk/sign

# Canton query
curl -X POST \
  -H "X-API-Key: cws_..." -H "X-API-Secret: ..." \
  -H "Content-Type: application/json" \
  -d '{"templateId":"pkg:Module:Template"}' \
  https://portal.example.com/api/sdk/canton/query

Endpoint Reference

Endpoint	Method	Description
/api/sdk/addresses	GET	Wallet addresses (all chains)
/api/sdk/balance	GET	Canton CC and token balances
/api/sdk/transactions	GET	Transaction history
/api/sdk/transfer	POST	Transfer tokens
/api/sdk/sign	POST	Sign message or transaction
/api/sdk/canton/query	POST	Query Daml contracts
/api/sdk/canton/create	POST	Create Daml contract
/api/sdk/canton/exercise	POST	Exercise Daml choice
/api/sdk/keys	GET	List SDK API keys (session auth)
/api/sdk/keys/:id	DELETE	Revoke SDK API key (session auth)

Key Management

# List your SDK keys (requires session auth, not API key)
curl -H "Authorization: Bearer SESSION_TOKEN" \
  https://portal.example.com/api/sdk/keys

# Revoke a key
curl -X DELETE \
  -H "Authorization: Bearer SESSION_TOKEN" \
  https://portal.example.com/api/sdk/keys/KEY_ID

Scoping & Rate Limits

Each SDK API key can be scoped with:

• allowed_chains: restrict to specific chains (e.g. ["canton", "evm"])
• allowed_operations: restrict operation types (e.g. ["query"] for read-only)
• spending_limits: per-chain daily spending caps
• rate_limit: requests per minute (default: 30)

Security Model

API Key (cws_xxx) → SHA-256 hash → lookup sdk_api_keys table
X-API-Secret (hex) → HKDF-SHA256 → AES-256-GCM key → decrypt wallet keys

• Two credentials required: API key (identity) + API secret (decryption key)
• Server never stores cleartext keys: keys encrypted client-side before upload
• D1 database compromise insufficient: encrypted blobs need the API secret
• Immediate revocation: delete key → all encrypted copies cascade-deleted