Vitalik Buterin Pitches Verifiable ZK API Metering System Worldwide

Davide Crapis and Vitalik Buterin propose a system for API metering that balances privacy, security, and efficiency. The model uses Rate-Limit Nullifiers to bind anonymity to a financial stake, forcing spammers to reveal their identity. It supports both fixed-cost-per-call and variable-cost APIs, with users accumulating signed refund tickets to reclaim credits and unlock future capacity.