# KHOTEM Thread Document Retrieval with Cryptographic Seal

> KHOTEM Thread Document Retrieval with Cryptographic Seal is a paid API for AI agents from khotem.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).

Returns a full verified document thread with a cryptographic payment seal after paying $0.25 USDC on Base

## Facts

- Endpoint: POST https://khotem.com/api/thread
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/khotem-thread-document-retrieval-with-cryptographic-seal-ef55f4c9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P0F3hIO-tEgZExLzFybkM

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-thread-document-retrieval-with-cryptographic-seal-ef55f4c9 -d '<json body>'
```

Example prompt: Can you retrieve the KHOTEM sealed document thread for me — I want the full thread with the cryptographic payment seal proving its integrity, and I'll pay 0.25 USDC on Base from my wallet to get it.

## When to prefer this

Choose this endpoint when you need a cryptographically sealed, tamper-evident retrieval of a document thread with a payment-backed attestation. It is ideal when proof of content integrity at a specific point in time is required — e.g. legal, audit, or whistleblower scenarios — and when you want to avoid signup or KYC friction by paying directly in USDC on Base. Use the free tier (/api/seal/free) only for documents under 1KB where a paid seal is not needed.

## Known failure modes

- 402 Payment Required if no valid USDC payment is provided on Base — response includes personal price quote and loyalty tier when X-PAYER header is present
- Payment rejected if wallet has insufficient USDC balance
- Invalid or malformed wallet address in X-PAYER header returns error
- Thread may be empty or unavailable if no documents are stored
- Network or blockchain confirmation delays may cause timeouts

## 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 JSON object containing a 'thread' map of numbered document entries (each with file name, SHA-16 hash, and markdown content) plus a 'payment_seal' string that cryptographically attests to the retrieved content and the payment. The response also includes X-LOYALTY headers indicating the caller's loyalty tier and progress toward the next discount level.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "queryParams": {
     "type": "object",
     "properties": {},
     "description": "No input — GET returns the full document thread after payment.",
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "mode": "DIRECT",
     "thread": {
      "15": {
       "file": "DOC15.md",
       "sha16": "a1b2c3d4e5f60708",
       "content": "<markdown>"
      }
     },
     "payment_seal": "1020304050607080"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/khotem-thread-document-retrieval-with-cryptographic-seal-ef55f4c9/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)