Integrate Ethereum zkAPI by pinning the deployment and circuit artifacts as one trusted configuration, keeping account credentials out of private protocol requests, and preserving wallet and transaction-recovery state through confirmation. Do not treat a valid proof, a healthy service, or an unconfirmed transaction as proof that the whole integration is secure. The Ethereum Foundation announced zkAPI on October 1, 2026; the project repository describes its implementation as experimental.
What zkAPI does—and what it does not protect
zkAPI separates payment authorization from API identity. A user deposits funds into a vault, then uses zero-knowledge proofs to authorize metered API use without sending the prompt to the payment server. In the Ethereum Foundation’s October 1, 2026 launch description, a client can obtain a short-lived API key capped in dollars, send prompts directly to an inference provider, and later use a signed usage receipt for settlement. The provider-facing integration accepts a proof instead of an API key and settles signed usage receipts.
That separation is not complete anonymity. The inference provider still receives the request and can see network metadata such as the client’s IP address. Timing can help correlate activity, and personal details, writing style, conversation history, or shared project documents may identify a user across prompts. In proxy mode, the relay can see the traffic too. The Foundation’s stated design goal is that “The provider sees the requests, and the payment layer sees the spend. Neither learns the link between them.” Read that as a payment-layer unlinkability goal, not a promise that prompts or network activity are private.
Choose the request path with its visibility trade-off in mind
| Integration path | How requests travel | Who can see request traffic | Operational trade-off |
|---|---|---|---|
| Runtime-key mode | The client obtains a short-lived, dollar-capped API key and sends prompts directly to the inference provider. A signed usage receipt is later used for settlement. | The inference provider sees the prompt and network metadata. The payment server is not sent the prompt as part of the described payment authorization flow. | Separates the payment flow from prompt delivery, but requires a client-side provider request path. |
| Proxy mode | The zkAPI server relays requests. | The inference provider and the relay can see the traffic. | The Ethereum Foundation describes this as simpler to operate. |
Neither path hides the prompt from the inference provider. Choose based on which component you are willing to trust with request traffic, not on an assumption that one mode provides full content privacy.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →#1 Best Overall
Common integration mistakes and how to avoid them
1. Mixing deployment and circuit artifacts
Configure the SDK before initializing it. Treat the network, vault, trusted deployment, signing keys, proof hashes, manifest URLs, and circuit identifier as a single pinned set: a partial match is not enough. The documented circuit identifier is zkapi-v2-note-bound-v1; make sure it agrees across the manifest and host configuration, and that the verifier, proving keys, and signing-key pins correspond to that configuration.
A circuit header can catch accidental incompatibility, but it does not replace independently pinned key hashes or establish how setup secrets were handled. The repository describes the active implementation as Groth16 over BN254, using Poseidon, note-bound Baby-JubJub commitments and Schnorr signatures, and a 32-level Merkle tree. It also documents a single-party setup assumption. The note-binding document explains that the commitment design is intended to bind a signed balance commitment to the same note used for Merkle membership; artifact hashes alone do not prove setup secrets were destroyed.
- Review and pin the deployment and cryptographic artifacts together before initialization.
- Reject a manifest or host configuration whose circuit identifier or key hashes do not match the trusted configuration.
- Do not interpret matching artifacts as evidence of setup provenance or independent security review.
2. Sending application credentials with private protocol calls
The SDK documentation requires private proof and key-issuance requests to omit account credentials. Preserve that behavior in same-origin rewrites as well as direct requests; a custom transport must keep credentials: 'omit'. A rewrite that silently adds a logged-in application session can disclose account identity to a service that should receive only the protocol request.
Rank #2
Keep sensitive values out of diagnostic output. Do not log note secrets, API key values, proof bodies, wallet transactions, or testnet passwords. Do not forward recovery metadata such as zkapiRecovery to a remote RPC service.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problems3. Treating an ordinary ETH transfer as a private-note deposit
A native ETH deposit requires the SDK’s payable vault calldata and an exact ETH value corresponding to the integer-gwei ledger amount. Sending ETH to the vault as a plain transfer is not equivalent to creating or funding a private note. The documented SDK does not support token manifests, token minting, approvals, or token transfers, so do not infer token support from the native-ETH flow.
For an ambiguous submission, use the SDK’s authoritative funding-quote state and documented recovery flow. A visible transaction hash by itself does not establish that the SDK has safely recorded or reconciled the funding operation.
4. Losing transaction context during wallet recovery
Keep wallet state and recovery journals with the deployment configuration they belong to. If you implement manual signing, durably save the exact transaction and its recovery context before showing an executable payload. When a signed transaction is returned, validate its hash against the intended chain, sender, target, value, nonce, and calldata.
Submission is not confirmation. Continue through the SDK’s canonical-state and finality checks before presenting a deposit or withdrawal as complete. For pending or ambiguous work, resume through the documented recovery flow rather than constructing a replacement transaction from partial state.
5. Switching wallet providers while work is in flight
The SDK documents that changing providers during asynchronous work can fail with wallet_provider_busy. Nested operations retain one provider across RPC reads, wallet prompts, journal commits, and receipt polling. Select the provider before initialization when restoring a transaction, and do not switch away while durable work remains unresolved.
Rank #4
6. Mistaking a health check or lifecycle test for live validation
The project repository distinguishes process health from successful chain synchronization and challenge submission. A running service or successful health endpoint does not establish that the operator is synchronized with the intended chain or has submitted challenges successfully.
The repository’s end-to-end lifecycle test uses a mocked provider and oracle, although protocol services, wallet proofs, and contracts are real in that test. It is useful evidence about the tested lifecycle, not validation against a live provider or live oracle. Check process health, chain synchronization, and challenge submission separately in a real deployment.
7. Deploying without challenge and signer controls
The repository documents a separate challenge service and a restricted signer. Its deployment material says that omitting the challenge profile means there is no escape-challenge protection, and that the signer port should not be published. Match the chain, vault, public manifest, and daemon configuration; restrict the signer to the configured vault.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
- Keep signer credentials out of container images, public manifests, and command arguments.
- Do not expose the signer port publicly.
- Confirm the challenge service is included and configured for the same deployment as the daemon.
8. Claiming that payment unlinkability means full anonymity
Describe the privacy boundary accurately in product copy, consent screens, and threat models. The payment flow is designed to separate spend from API identity; it does not prevent the inference provider from seeing prompts or network metadata, stop timing-based correlation, or make identifying details in a prompt anonymous. Proxy mode additionally gives the relay visibility into request traffic.
9. Assuming a valid proof validates external facts
A zero-knowledge proof establishes a statement defined by its circuit. It does not automatically prove that an external fact was obtained from the correct source or is still current. Ethereum.org’s oracle guidance treats correctness, authenticity, integrity, and availability as distinct concerns. If a custom integration brings offchain facts onchain, validate the source and freshness independently, and decide how the application should behave when the oracle is unavailable or returns unusable data.
10. Skipping review of custom permissions and data feeds
For contracts you add around zkAPI, review access control and oracle-manipulation risks. Ethereum.org’s smart-contract security guidance points developers to testing, static and dynamic analysis, formal verification, audits, and bug-bounty resources. These are general review areas for custom surrounding contracts, not reported findings about zkAPI’s own contracts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to verify before shipping
- Configuration: Deployment, network, vault, manifest, circuit identifier, verifier, proving keys, and signing-key pins all match the reviewed configuration.
- Request handling: Private proof and key-issuance calls omit application credentials through every transport and rewrite; secrets and recovery metadata are excluded from logs and remote RPC requests.
- Funding: Native deposits use the SDK’s payable vault calldata and the exact value for the integer-gwei ledger amount. Ambiguous submissions go through the SDK’s funding-quote and recovery state.
- Wallet recovery: Wallet and journal state are retained with the correct deployment; manual-signing context is durable before an executable payload is presented; returned transactions are checked against their intended fields.
- Completion checks: Transaction submission is followed by canonical-state and finality checks. Operator process health, chain synchronization, and challenge submission are checked as separate conditions.
- Operational controls: Challenge protection is configured, signer access is restricted to the configured vault, the signer port is not public, and credentials are not embedded in images or public configuration.
- Privacy claims: Users are told that the provider sees prompts and network metadata, and that proxy mode also exposes traffic to the relay.
- Custom contracts: Permissions and external data feeds receive their own threat review and appropriate testing or independent review.
What the current project status does—and does not—establish
The project repository calls the implementation experimental and documents a single-party setup assumption. The repository materials do not establish whether an independent security audit of the current implementation has been completed, or what its scope or findings were. Experimental status is not proof that an audit did or did not occur. Do not claim an audit, security score, or production assurance without an authoritative report that supports it.
Recommended Free Tools
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
