1. WhatsApp API Limitations

Unlike Telegram, WhatsApp has strict rules on bot interactions. It does not natively support real-time blockchain transactions or flexible command-based automation. To overcome this, we built a custom middleware system that processes commands, interacts with blockchain networks, and delivers responses to users in a seamless way.

2. Secure Transaction Handling

Since users interact with SeiLink via text commands, ensuring secure authentication and transaction execution was critical. We implemented multi-factor authentication (MFA), cryptographic signatures, and session-based validation to protect against unauthorized access. Additionally, API keys and private credentials are securely stored using encrypted environment variables to prevent exposure.

3. Multi-Chain Integration

Supporting multiple blockchain networks, including Ethereum, SEI, and Polygon, required extensive work in handling different APIs, transaction formats, and gas fee calculations. We built a smart transaction routing system that dynamically selects the best network for each action, optimizing costs and transaction speeds for users.

4. Real-Time Crypto Data Retrieval

Providing real-time price updates and token balances within WhatsApp was another challenge. We integrated CoinGecko’s API for market data, but rate limits and response times had to be carefully managed. We implemented intelligent caching and request batching to keep data fresh while reducing API call overhead.

5. Seamless NFT and Prediction Market Access

Integrating OpenSea for NFT trading and Polymarket for prediction markets meant handling different authentication flows and transaction types. Since WhatsApp does not support rich media like NFT previews by default, we created custom URL previews that allow users to see NFT details within the chat interface.