# KHOTEM Notary Audit & Session Verification

> KHOTEM Notary Audit & Session Verification is a paid API for AI agents from khotem.com, paid per call via x402, $0.15/call, status unknown (last checked 2026-09-13).

Performs SEAL-based notarization, session verification, and audit logging for documents or events, paid per-call via USDC on Base with no signup or KYC required.

## Facts

- Endpoint: POST https://khotem.com/api/audit
- Price: $0.15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/khotem-notary-audit-session-verification-2327688b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xEm6obHyrlBhGISfNitof

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability khotem-notary-audit-session-verification-2327688b -d '<json body>'
```

Example prompt: I need to notarize and seal this session record for our audit — submit it to KHOTEM's audit endpoint and pay the $0.15 USDC fee on Base so we get back a tamper-proof seal and audit record.

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call notarization or audit sealing without account registration, KYC, or subscription. Ideal for agents that need occasional tamper-proof timestamps or session verification and want to pay programmatically in USDC on Base. Prefer over traditional notary APIs when anonymity and on-chain payment are priorities.

## Known failure modes

- Payment not received or insufficient USDC balance — endpoint returns 402 Payment Required
- Malformed or missing audit payload — endpoint returns 400 Bad Request
- Network issues on Base blockchain causing payment confirmation delay
- Duplicate submission may generate a new seal rather than idempotent result
- Invalid session data format rejected with validation error

## How this service works

Paid cryptographic witness services for autonomous agents and humans: seals, attestations, verification, audit, sealed document thread. x402-native micropayments, USDC on Base / Polygon / Solana, direct on-chain verification. No accounts, no API keys, no KYC.

## Output

Returns a SEAL notarization proof, timestamped audit record, and verification result confirming the submitted data was sealed at the time of the call — including a unique seal identifier and audit entry that can be used as tamper-proof evidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "body": {
     "type": "array",
     "items": {
      "type": "object",
      "required": [
       "seal"
      ],
      "properties": {
       "seal": {
        "type": "object",
        "required": [
         "root"
        ],
        "properties": {
         "root": {
          "type": "string",
          "description": "merkle root hex"
         }
        }
       }
      },
      "description": "Session object. All fields except \"seal\" and \"_\"-prefixed are hashed into leaves; seal.root must equal the merkle root."
     },
     "description": "Array of session objects, same shape as /api/verify"
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "ok": 3,
     "total": 5,
     "results": [
      {
       "ok": true,
       "root": "9f2c…"
      },
      {
       "ok": false,
       "reason": "root_mismatch"
      }
     ],
     "verdict": "✗ TAMPERED",
     "payment_seal": "a1b2c3d4e5f60708",
     "verdict_seal": "1020304050607080"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/khotem-notary-audit-session-verification-2327688b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from khotem.com](https://www.zero.xyz/host/khotem.com/llms.txt)