Proof-of-Human connectorStreamable HTTP · MCP
5arz issues and verifies Proof-of-Human-Fulfillment (PoHF) credentials: signed, independently checkable evidence that a real, ID-verified, live human performed a specific piece of work. This connector puts that inside your agent session.
Server URL https://mcp.5arz.com/directory
Streamable HTTP
No authentication to connect
4 tools need no account at all
Free plan: 1,000 seals/mo
A credential outlives us. Every PoHF credential is an ES256-signed JWT. Anyone can validate it against the public JWKS at api.5arz.com/.well-known/jwks.json — offline, without an account, and without calling us.
check_credential does exactly that in-session. That is the point of the design: the proof does not depend on trusting the issuer.Connect
claude mcp add --transport http 5arz https://mcp.5arz.com/directoryOr in a client config:
{
"mcpServers": {
"5arz": {
"type": "http",
"url": "https://mcp.5arz.com/directory"
}
}
}No credential is needed to connect.
check_credential, get_vhh_index, list_verified_human_tasks and get_attestation_receipt work immediately. The three tools that act on your account ask for a 5arz API key, which you create in-session with register_agent — free, no card.Tools
| Tool | What it does | Key? |
|---|---|---|
| Read-only — no account required | ||
check_credential | Validate a PoHF credential someone handed you. Verifies the ES256 signature against the live public JWKS and checks expiry and not-before, then returns the claims. Pure cryptography — no trust in 5arz required. | no |
get_vhh_index | Read the Verified-Human-Hour index — a published benchmark price for one hour of verified human work, with its epoch, method version and whether the figure is provisional or final. | no |
list_verified_human_tasks | See what verified human work is currently available: title, USD price, time estimate, slots remaining, and the kind of fulfillment receipt issued on completion. | no |
get_attestation_receipt | Fetch a completed Proof-of-Human-Fulfillment receipt by attestation_id — the signed packet, the verifier identity, and the JWKS URL to check it yourself. | no |
| Your account | ||
register_agent | Create a 5arz API key. Free plan: 1,000 credential seals a month plus 10 document checks, no card. mode:"test" returns a sandbox key (arz_test_…) whose credentials are marked test:true and must never be treated as production proof. | no |
verify_human | Mint a signed PoHF credential — sessionId for work fulfillment, or memberId for personhood (optionally wallet-bound). | yes |
get_balance | Your current plan, seals and document checks used this month, and what remains. | yes |
subscribe | Returns a Stripe checkout link to change plan: Starter $99/mo, Growth $499/mo, Scale $2,499/mo. The connector returns a link; it does not take payment. | yes |
The common case
An agent receives work product and needs to establish that a human, not a model, produced it.
1The work arrives with a PoHF credential attached (an ES256 JWT)
2check_credential {pohf_jwt} → signature verified against the public JWKS, claims returned
3Act on a signed yes or no you can re-verify yourself, at any time, without us
curl -s https://mcp.5arz.com/directory \
-H 'content-type: application/json' \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
"params":{"name":"check_credential",
"arguments":{"pohf_jwt":"eyJhbGciOiJFUzI1NiIs…"}}}'Issuing your own credentials
1register_agent → your API key (Free plan: 1,000 seals a month, no card)
2verify_human → a signed PoHF credential (ES256 JWT)
3check_credential → anyone confirms it against the JWKS, including you
Scope of this endpoint
This connector does not move money. It issues, verifies and prices proof of human work.
5arz also offers per-task purchases of verified human work over x402/USDC (developer preview on Base Sepolia). That is a separate integration on a separate endpoint — see the full MCP server documentation — and it is deliberately not part of this connector.
subscribe returns a Stripe checkout link for a person to complete; nothing here settles a payment.5arz also offers per-task purchases of verified human work over x402/USDC (developer preview on Base Sepolia). That is a separate integration on a separate endpoint — see the full MCP server documentation — and it is deliberately not part of this connector.
Data handling
This server is a thin, stateless wrapper over 5arz's own first-party API at api.5arz.com. It stores nothing from your session. It records anonymous tool-usage counts keyed to a one-way hash of the API key, and it never reads conversation content, chat history, memory, or files.
Full detail: privacy policy · terms · support.
Patent pending (US provisional 63/979,052 + 63/979,474).
Try it now
Connect the server and run check_credential on any PoHF credential — or paste one into the browser verifier. Don't trust us. Check.