Getting Started

Connect to Cosmos chains using OneKey's Keplr-compatible provider

Learn how to detect, connect, and interact with Cosmos chains using OneKey's provider.

---

Provider Detection

// Detect OneKey Cosmos provider
const provider = window.$onekey?.cosmos

if (!provider) {
  throw new Error('OneKey Cosmos provider not detected')
}

// Check if it's OneKey
console.log('Provider:', provider.isOneKey ? 'OneKey' : 'Unknown')

---

Connect to Chain

const chainId = 'cosmoshub-4'

// Enable the chain - returns key info
const key = await provider.enable(chainId)

// Or enable multiple chains at once
await provider.enable(['cosmoshub-4', 'osmosis-1', 'juno-1'])

---

Get Account Info

const chainId = 'cosmoshub-4'
const key = await provider.getKey(chainId)

console.log({
  name: key.name,           // Account name
  algo: key.algo,           // Signing algorithm (secp256k1)
  pubKey: key.pubKey,       // Public key (Uint8Array)
  address: key.address,     // Bech32 address (Uint8Array)
  bech32Address: key.bech32Address,  // Bech32 formatted address
  isNanoLedger: key.isNanoLedger,    // Hardware wallet flag
})

---

Add Custom Chain

Use experimentalSuggestChain to add chains not natively supported:

await provider.experimentalSuggestChain({
  chainId: 'my-chain-1',
  chainName: 'My Custom Chain',
  rpc: 'https://rpc.mychain.io',
  rest: 'https://lcd.mychain.io',
  bip44: { coinType: 118 },
  bech32Config: {
    bech32PrefixAccAddr: 'mychain',
    bech32PrefixAccPub: 'mychainpub',
    bech32PrefixValAddr: 'mychainvaloper',
    bech32PrefixValPub: 'mychainvaloperpub',
    bech32PrefixConsAddr: 'mychainvalcons',
    bech32PrefixConsPub: 'mychainvalconspub',
  },
  currencies: [{
    coinDenom: 'TOKEN',
    coinMinimalDenom: 'utoken',
    coinDecimals: 6,
  }],
  feeCurrencies: [{
    coinDenom: 'TOKEN',
    coinMinimalDenom: 'utoken',
    coinDecimals: 6,
    gasPriceStep: { low: 0.01, average: 0.025, high: 0.04 },
  }],
  stakeCurrency: {
    coinDenom: 'TOKEN',
    coinMinimalDenom: 'utoken',
    coinDecimals: 6,
  },
})

---

Disconnect

await provider.disconnect()

---

Using with CosmJS

Get offline signers for use with CosmJS:

const chainId = 'cosmoshub-4'

// Auto-detect best signer type
const offlineSigner = await provider.getOfflineSignerAuto(chainId)

// Or use specific signer types
const aminoSigner = provider.getOfflineSignerOnlyAmino(chainId)
const directSigner = provider.getOfflineSigner(chainId)

// Use with CosmJS
const client = await SigningStargateClient.connectWithSigner(
  'https://rpc.cosmos.network',
  offlineSigner
)

// Send tokens
const result = await client.sendTokens(
  senderAddress,
  recipientAddress,
  [{ denom: 'uatom', amount: '1000000' }],
  { amount: [{ denom: 'uatom', amount: '5000' }], gas: '200000' }
)

---

Migration from Keplr

OneKey's Cosmos provider is Keplr-compatible. Simply change your provider detection:

// Before (Keplr only)
const provider = window.keplr

// After (OneKey with Keplr fallback)
const provider = window.$onekey?.cosmos || window.keplr