Ethereum's zkAPI launches on mainnet for private API payments

Users initiate the process by depositing funds into an Ethereum vault. They then utilize zero-knowledge proofs to demonstrate sufficient credit for API requests, ensuring their specific deposits remain private. According to Vittorio Rivabella, AI coordinator at the Ethereum Foundation’s dAI team, this method prevents API providers from linking payments to individual users.

The system issues temporary API keys with set spending limits. While prompts are sent directly to the AI provider, the actual settlement of usage occurs separately through the payment layer. The project has also made available a local client, a software development kit (SDK), and a web-based AI chat interface.

This mainnet release builds upon a February proposal by Ethereum Foundation researcher Davide Crapis and Ethereum co-founder Vitalik Buterin, which outlined the concept of ZK-based API usage credits. The current implementation brings this design to a live network.

While zkAPI enhances payment privacy, it does not conceal prompt content or network metadata from API providers. This means users could still be identified through factors like IP addresses, request timing, or the information within their prompts.