★ 5arz / for AI agents
Proof-of-Human-Fulfillment · the fulfillment half of agentic commerce

Payment rails let an agent pay.
5arz proves a human did the work.

Mastercard Agent Pay, Visa Trusted Agent and x402 move the money. None of them prove a real, attentive human actually performed the task. 5arz issues that proof — a portable, cryptographically verifiable credential — and you pay per verification.

Get an API key → See pricing

What you get

PoHF

A signed credential

An ES256 JWT (Proof-of-Human-Fulfillment) per verified unit of work — quality score + tamper-evident telemetry and recording hashes. Verify it with our public JWKS using any standard JWT library, no 5arz SDK.

UCC Article 12

Clean provenance

Each unit of verified work is a Controllable Electronic Record under UCC Art. 12 — the "take-free" rule gives buyers a clean chain of title to the human output, a real edge in a bot-poisoned market.

Standards

Drop-in for agents

Compatible with Verifiable Intent and the Visa Trusted Agent Protocol; settles over Agent Pay, Stripe, or USDC. Bind each credential to your agent key (cnf.jkt).

How it works

1
Register

Get an API key (arz_live_…).

2
Buy credits

Prepay a pack of verifications via Stripe.

3
Verify

Call /api/agents/verify on a verified human session.

4
Trust it

Validate the credential against the public JWKS.

Pricing — pay per verification

Starter

$49
100 verifications · $0.49 each

Growth popular

$299
1,000 verifications · $0.30 each

Scale

$1,999
10,000 verifications · $0.20 each

Volume & enterprise (metered billing, SLAs, on-prem verifier): info@5arz.com.

Get started

Your key is shown once. Then buy credits and verify:

# 1) buy a pack (returns a Stripe checkout URL)
curl -s -X POST https://api.5arz.com/api/agents/credits/buy \
  -H "Authorization: Bearer arz_live_…" \
  -H "Content-Type: application/json" -d '{"pack":"starter"}'

# 2) check balance
curl -s https://api.5arz.com/api/agents/credits/balance \
  -H "Authorization: Bearer arz_live_…"

# 3) spend 1 credit → get a Proof-of-Human credential
curl -s -X POST https://api.5arz.com/api/agents/verify \
  -H "Authorization: Bearer arz_live_…" \
  -H "Content-Type: application/json" -d '{"sessionId":"…"}'

# 4) verify anywhere with the public keys
curl -s https://api.5arz.com/.well-known/jwks.json

FAQ

What is Proof-of-Human-Fulfillment (PoHF)?

A cryptographically signed credential (ES256 JWT) proving a real, attentive human — not a bot — performed a task. Anyone can verify it against 5arz's public JWKS; no 5arz SDK required.

How does an agent verify a human did the work?

Commission verified work or reference a verified human session, then call /api/agents/verify. You get back a PoHF credential validatable against the public keys.

How much does it cost?

Prepaid packs: 100/$49, 1,000/$299, 10,000/$1,999. Volume & enterprise pricing on request.

Does it work with Mastercard Agent Pay & Visa Trusted Agent?

Yes — 5arz is the fulfillment half of agentic commerce. Compatible with Verifiable Intent and the Visa Trusted Agent Protocol; settles over Agent Pay, Stripe, or USDC.