Know Your Human
ZK Identity for the Celo Ecosystem
Identity verification for AI agents and dApps on Celo. Zero-knowledge proofs. Private AI reasoning. On-chain credentials.
Verify Once. Read Forever.
One verification costs free to $0.75 depending on tier. After that, the on-chain credential is free for everyone to read. Any agent, any dApp, any protocol. No recurring fees. No per-read charges. Ever.
Agents pay per verification via x402 in cUSD. No API keys, no sign-ups. Credentials issued as EAS attestations on Celo. Powered by Venice AI for private cognition.
For AI Agents
Check a wallet: GET /api/check/0xABC... Free, no auth. Download the agent skill file for complete integration instructions, or read the API docs.
Verification Flow
Four Tiers. One API.
Pay per verification in cUSD on Celo. No subscriptions, no minimums. Reputation tier is free. Agents with Self Agent ID get 20% off. Identity providers are modular: new verification services can be added at any time.
Reputation
Onchain activity scoring, basic sybil resistance
- Onchain activity scoring
- Social presence analysis
- Basic sybil resistance
- No documents required
- EAS credential on Celo
- 90-day validity
Document
ZK passport proof via Self Protocol
- NFC passport chip scan
- ZK-SNARK proof generated
- Age + nationality derived
- No biometrics needed
- EAS credential on Celo
- 90-day validity
Biometric
Liveness + face match + gov ID via Didit
- Gov ID document scan
- Liveness detection
- Face match verification
- IP analysis (VPN/proxy check)
- EAS credential on Celo
- 90-day validity
Full KYC
ZK passport + biometric + AML screening
- ZK passport proof (Self)
- Biometric liveness (Didit)
- AML/sanctions screening
- IP analysis included
- EAS credential on Celo
- 90-day validity
How It Works
Verify once. Reuse forever. Any agent or dApp checks the credential with a single contract call.
Agent or dApp Requests Verification
An AI agent (identified via ERC-8004) or dApp calls the KYH API with a wallet address and desired tier. No API keys needed. The wallet IS the identity.
x402 Micropayment in cUSD
KYH returns a 402 Payment Required response. The caller pays automatically in cUSD on Celo. No invoices, no sign-ups, no minimums.
Human Verifies Once
The human receives a verification link. Depending on tier: check onchain activity (Reputation), scan passport NFC via Self Protocol (Document), or complete liveness + face match via Didit (Biometric/Full KYC). Takes 5–120 seconds.
Venice Decides Privately
All verification signals go to Venice AI for holistic analysis. Venice reasons about cross-provider patterns, flags anomalies, and makes the final pass/fail decision. Zero data retention. Private cognition, not hard-coded rules.
EAS Attestation Issued on Celo
KYH issues an EAS attestation to the human's wallet, valid for 90 days. Any agent or dApp reads it for free with a single contract call. Your identity follows you to Celo.
Built for the Agentic Web
Agents prove they're human-backed via Self Agent ID, a zero-knowledge proof that a real person operates the agent. dApps identify by wallet address. Both pay via x402 in cUSD.
No API keys. No sign-ups. No dashboards. The wallet IS the identity.
Powered by Venice AI
Venice is KYH's core reasoning engine. Every verification decision is made by Venice's private inference, not hard-coded rules. Zero data retention means your identity is verified, never stored.
Zero Data Retention
Venice processes verification signals and returns a decision. Nothing is stored. No logs, no training data, no records. The privacy guarantee is structural, not a policy page.
Holistic Reasoning
Venice analyzes all provider signals together, catching patterns that simple threshold logic can't. “Liveness passed but wallet is 2 hours old” gets flagged. Cross-provider anomalies get caught.
Private Cognition
Direct Venice API. No middlemen, no aggregators. Your verification data never touches a third-party server. Venice sees anonymized signals, decides, and forgets.
Deterministic Fallback
If Venice is unreachable, KYH falls back to deterministic scoring, clearly labeled as “FALLBACK” in the response. No silent degradation. The agent always knows who decided.
Real Use Cases
Anywhere an agent or dApp needs to know: is this wallet a verified human?
Cross-Border Remittance
Agent sends cUSD internationally. Remittance dApp requires sender identity. KYH verifies once, all future transfers clear instantly.
Micro-Lending
Lending protocol needs proof of unique humanity before issuing a loan. Reputation tier works without a passport. Onchain activity and social proof is enough.
Governance & Quadratic Funding
DAO voting or Gitcoin-style rounds need one-person-one-vote guarantees. KYH Basic or Standard provides sybil-resistant proof of personhood.
Regulated DeFi Pools
Some liquidity pools require KYC for AML compliance. Enhanced tier provides full biometric + sanctions screening with a 90-day reusable credential.
Built With
KYC for the Agentic Web
As AI agents gain autonomy and handle real-world transactions, identity verification becomes critical infrastructure.
One API. Four tiers. Credentials that travel with your wallet for 90 days. Agents pay. Humans verify once. Everyone reads for free.