A secondary report says zkAPI can let its treasury claim an expired, unclosed deposit note. The Ethereum Foundation’s listing describes the project’s broader aim—private, metered API access funded by deposits—but does not spell out the expiry rule. The duration, recovery options and claim process have not been established in the sources available here.
What zkAPI is—and what is reported about expired deposits
The Ethereum Foundation dAI Team lists a project called ZK API Usage Credits: LLMs and Beyond, credited to Davide Crapis and Vitalik Buterin. Its summary describes a protocol for private, metered API access: users deposit funds once, then make unlinkable requests, with Rate-Limiting Nullifier (RLN) and zero-knowledge solvency proofs involved.
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A CryptoCompass report published October 2, 2026 identifies the launched tool as zkAPI and says it went live on Ethereum mainnet on October 1, 2026. The report also says a note has an expiry date and that the treasury can claim it if the note has not been closed by then. The treasury-claim detail is reported by this secondary source; the Ethereum Foundation listing does not confirm it.
What is not yet clear about the expiry rule
The available sources do not establish how long a note lasts, whether a user can recover or renew an expired note, what action triggers a treasury claim, or what entity or wallet “treasury” refers to. They also do not provide the implementation details needed to assess how the expiry rule works in practice.
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So the reported consequence is specific but incomplete: an unclosed note may be claimable by the treasury after expiry. That is not enough to determine whether users have a grace period, a recovery route, or any other protection. Those details require a technical specification or an authoritative statement from the project.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the privacy description does—and does not—establish
The Foundation’s summary supports describing zkAPI as intended to provide private, metered access with unlinkable requests, using RLN and zero-knowledge solvency proofs. It does not provide a full threat model or explain which information is hidden from the API provider, the payment system, or other parties. In particular, the summary alone does not establish that prompts, responses, provider identity or every payment attribute are private.
Don’t confuse zkAPI with similarly named projects
zkAPI is not the same project as zBase, whose site describes private USDC payments for AI agents using x402 and Privacy Pools. Nor is it Eunomia, a Stellar Soroban treasury project whose “Leash” feature describes expiry of an agent’s spending authority. Those projects do not verify zkAPI’s reported expired-note rule.
Quick Recap
Sources
- Ethereum Foundation dAI Team, “Publications” — official listing for “ZK API Usage Credits: LLMs and Beyond,” credited to Davide Crapis and Vitalik Buterin.
- CryptoCompass, October 2, 2026 — secondary report on the claimed mainnet launch and expired-note treasury behavior.
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