Prove a person
was there.
A human verification API, Know Your Agent and more — all on one signed seal. Each shows where it stands today.
- Free to check
- ES256 signatures
- API and MCP
Proof-of-Human API
One call to our human verification API confirms a verified, live person is behind an action.
- Signed credential you can re-check any time
- Checking is free and unlimited
- REST API with an OpenAPI spec
Know Your Agent
KYA for AI agents: before you act on an agent’s request, check a verified person stands behind it.
- MCP server agents call directly
- Same public key checks every seal
- Agents can register themselves
Data and evals
Human-labeled AI training data and RLHF evals from verified people. Every row carries a seal.
- Each row traces to one verified person
- Members pass ID + liveness first
- Set up with us directly
On-chain personhood
A wallet-bound credential smart contracts can check — with no documents on chain.
- Runs on the Base Sepolia test network
- Mainnet after an external audit
Built for teams that need proof.
AI labs and data teams
RLHF data where every row traces to a person.
Talk to us →
Platforms and marketplaces
Real people behind accounts and reviews.
Start free →
Agent builders
Show a verified person stands behind your agent.
Know Your Agent →
Crypto and fintech
Personhood checks without holding documents.
See the trust center →What’s next.
Not for sale yet. We’ll tell you when they open.
Verified clipping
Every clipper ID-verified, views fraud-screened, disclosure enforced. We don’t claim viewers are human.
Get notifiedWhat is 5arz for Business?
A signed credential that a real, ID-verified, live person did a specific action. Use it in your product through the API or MCP.
How do I know a real person did it?
Each person passes an ID and liveness check with our partners, Stripe Identity or Didit. Every output carries a seal you can check yourself, offline.
How does billing work?
Checking a seal is always free. Plans set how many seals you issue: 1,000 a month on Free, then $99, $499 or $2,499 a month.
Document checks are billed per check on paid plans. See pricing.
Does a seal prove someone has only one account?
No. A seal proves a specific verified person did a specific thing. If you need one entry per person, pair it with your own duplicate check.
Can my AI agent hire a person yet?
Not yet — hiring a person from your agent is coming soon. Get notified when it opens.
How fast can I start?
Get an API key in about thirty seconds, or let your AI agent sign itself up through MCP. No sales call needed.
Checking any seal is free. Forever.
Free plan: 1,000 seals a month. No card.