Utilities · x402 · early usage

SEAL: witnessed cryptographic stamp + timestamp

SEAL: witnessed cryptographic stamp + timestamp. POST body: {"content":"..."} (hashed and forgotten) or {"hash":"<sha256 hex>"} — content never leaves your machine. Returns seal_stamp + payment_seal.

by khotem.com · discovered, not yet claimed by its owner · updated 2026-10-13

30d calls1

30d payers1

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: bazaar · builderCode · conveyor · khotemSeal · knock

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-13

Input example from Bazaar metadata

{
  "content": "Hello, KHOTEM",
  "hash": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
}

Output example

{
  "note": "content not stored: hashed and forgotten",
  "payment_seal": "1020304050607080",
  "proof": "recorded in the KHOTEM ledger; verifiable via /api/attest",
  "seal_stamp": "a1b2c3d4e5f60708",
  "sha256": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
  "timestamp": "2026-08-24T12:00:00.000Z",
  "witness": "KHOTEM-SEAL"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/59750.json for the price and payment options.
Pay. Call GET https://khotem.com/api/seal. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, eip155:59144, eip155:324, eip155:534352, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.05 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, eip155:59144, eip155:324, eip155:534352, Solana
Demand: 1 calls · 1 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.05	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	Base eip155:8453	0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb	50000000000000000	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	Polygon eip155:137	USDC	$0.05	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	Polygon eip155:137	0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063	50000000000000000	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	eip155:59144 eip155:59144	0x176211869ca2b568f2a7d4ee941e073a821ee1ff	50000	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	eip155:324 eip155:324	0x1d17cbcf0d6d143135ae902365d2e5e2a16538d4	50000	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	eip155:534352 eip155:534352	0x06efdbff2a14a7c8e15944d1f4a48f9f95f663a4	50000	0xE61c2359F1539b15F092AADbAC332cf033767aec	60s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.05	AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z	60s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
    "amount": "50000000000000000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x3c499c542cef5e3811e1192ce70d8cc03d5c3359",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063",
    "amount": "50000000000000000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:59144",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x176211869ca2b568f2a7d4ee941e073a821ee1ff",
    "amount": "50000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:324",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x1d17cbcf0d6d143135ae902365d2e5e2a16538d4",
    "amount": "50000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "eip155:534352",
    "payTo": "0xE61c2359F1539b15F092AADbAC332cf033767aec",
    "asset": "0x06efdbff2a14a7c8e15944d1f4a48f9f95f663a4",
    "amount": "50000",
    "maxTimeoutSeconds": 60
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "AMYmNkTwwbfV5xAQzhAAmktWDCfJpg1UXn2yX2jHJB8Z",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "50000",
    "amountUsd": 0.05,
    "maxTimeoutSeconds": 60
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://khotem.com/api/seal"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://khotem.com/api/seal");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://khotem.com/api/seal")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: khotem.com
Endpoint: https://khotem.com/api/seal
Machine-readable: /resources/59750.json