What is the Injected Provider API (Testnet)?
The OKX Injected Provider API (Testnet) is a JavaScript-based framework embedded by OKX into websites visited by users. This powerful tool enables DApp developers to:
- Request user account information
- Read blockchain data from connected networks
- Facilitate message and transaction signing
👉 Explore Bitcoin Testnet Wallet Integration
Core API Methods
1. Connect Wallet
okxwallet.bitcoinTestnet.connect()Description
Establishes connection with the user's wallet.
Parameters
None
Returns
Promise
address(string): Connected account addresspublicKey(string): Corresponding public key
Example Implementation
const account = await okxwallet.bitcoinTestnet.connect();
console.log('Connected address:', account.address);2. Sign Messages
okxwallet.bitcoinTestnet.signMessage(signStr[, type])Description
Signs arbitrary messages using the wallet's private key.
Parameters
signStr(string): Data to be signedtype(string, optional): Signature algorithm ("ecdsa" | "bip322-simple")
Returns
Promise
Security Note
Always verify message signatures on-chain for critical operations.
3. PSBT Transactions
Single PSBT Signing
okxwallet.bitcoinTestnet.signPsbt(psbtHex[, options])Description
Signs a Partially Signed Bitcoin Transaction (PSBT).
Parameters
psbtHex(string): Hex string of PSBToptions(object):autoFinalized(boolean): Auto-finalize after signing (default: true)toSignInputs(array): Specify inputs to signdisableTweakSigner(boolean): Bypass Taproot tweaking
Taproot Handling
For Taproot inputs, provide:
{
index: 0,
address: 'tb1p...',
publicKey: '03...',
sighashTypes: [1]
}👉 Master PSBT Transactions Guide
Batch PSBT Signing
okxwallet.bitcoinTestnet.signPsbts(psbtHexs[, options])Description
Signs multiple PSBTs in a single operation.
Parameters
psbtHexs(string[]): Array of PSBT hex stringsoptions(object[]): Per-PSBT signing configurations
Best Practices for DEX Integration
User Experience
- Implement clear connection status indicators
- Provide transaction simulation before signing
- Handle rejection cases gracefully
Security Measures
- Validate all returned data on-chain
- Implement double-check dialogs for high-value transactions
- Use testnet for all development before mainnet deployment
FAQ Section
Q: How do I handle Taproot addresses in PSBTs?
A: Provide the publicKey parameter for any Taproot inputs. The wallet will automatically handle the signing process with proper tweaking unless disabled.
Q: What's the difference between signMessage types?
A: "ecdsa" uses standard Bitcoin message signing, while "bip322-simple" implements the newer BIP322 standard for improved message verification.
Q: Can I customize the signing flow?
A: Yes, through the options parameter you can:
- Control automatic finalization
- Specify exact inputs to sign
- Modify sighash types
- Adjust Taproot signing behavior
Q: How should I test my integration?
A: Always use the testnet environment first. Monitor the console for any rejection errors and implement proper error handling for all promise rejections.
Advanced Implementation Notes
For complex DEX integrations:
- Batch multiple operations when possible
- Cache frequently-used data like public keys
- Implement PSBT construction helpers to reduce user errors
- Consider UI indicators for network congestion states
Remember to always prioritize user security and transparency throughout your implementation.
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