Ethereum Foundation rolls out zkAPI on mainnet to enable private metered API payments
AI Market Summary
Ethereum Foundation's mainnet launch of zkAPI enables private, metered API payments (initially AI inference) using Groth16 proofs, Poseidon commitments, nullifiers, and a Merkle tree note system. The design separates payer identity from API usage while keeping funds withdrawable on-chain. This expands Ethereum's utility into privacy-preserving payments and AI-related infrastructure, potentially supporting broader on-chain demand for ETH-based settlement and ZK tooling.
Impact level
● Medium
Affected assets
ETH/USDT+0.55%
AI Insight · ETH/USDTAI Insight
▲ Bullish
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On October 1, 2026, the Ethereum Foundation and the Open Anonymity Project launched zkAPI on Ethereum mainnet, enabling users to pay metered API fees without revealing their identity. Users can deposit credits such as ETH or USDC into an on-chain vault contract in a single transaction. Spending is authorized with Groth16 proofs on the BN254 curve, using Poseidon hash commitments and a nullifier to prevent double-spends. Payment notes are tracked in a 32-level Merkle tree.
