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OpenAPI Specification

openapi: 3.2.0
info:
  title: KHOTEM — Cryptographic Witness Fetch API
  version: ядроv ∞ Ξ
  description: Paid cryptographic witness, settlement-routing and booth services for autonomous agents and humans. x402-native micropayments in USDC/DAI on Base/Polygon and native USDC on Linea, zkSync Era and Scroll, with direct on-chain verification; Solana where listed. No accounts, no API keys, no KYC.
  contact:
    email: khotem.web15@gmail.com
    url: https://khotem.com
  x-guidance: 'Discovery is free: GET /.well-known/x402 lists every paid resource with live per-network accepts and loyalty terms. To call a paid resource: request it once, read the 402 accepts list, transfer the exact asset amount on Base, Polygon, Linea, zkSync Era, Scroll or Solana to the payTo of your chosen network, then retry the SAME method with header X-PAYMENT: <txHash> (EVM) or <base58 signature> (Solana). POST endpoints take a JSON body as specified. Identity = your payer wallet; loyalty discounts apply automatically from the 5th payment. We witness. We don''t judge.'
tags:
- name: Fetch
paths:
  /api/fetch:
    post:
      summary: 'WEB FETCH: clean web data for agents — POST {"url":"https://…", "max_bytes"?} →…'
      x-payment-info:
        price:
          mode: fixed
          currency: USD
          amount: '0.005000'
        protocols:
        - x402: {}
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - url
              properties:
                url:
                  type: string
                  description: https URL to fetch
                max_bytes:
                  type: integer
                  minimum: 1024
                  maximum: 262144
      parameters:
      - name: X-PAYMENT
        in: header
        required: false
        schema:
          type: string
        description: 'Payment proof: txHash (EVM) or base58 signature (Solana)'
      responses:
        '200':
          description: 'WEB FETCH: clean web data for agents — POST {"url":"https://…", "max_bytes"?} → extracted text (HTML mechanically cleaned) + sha256 + seal. SSRF-guarded (https only, private ranges blocked, redirect re-checked), 12s timeout, 256KB cap.'
        '402':
          description: 'Payment Required. Two ways: (a) standard x402 — sign an EIP-3009 authorization for any accepts[] entry, retry with header PAYMENT-SIGNATURE or X-PAYMENT = base64 JSON payment payload; a facilitator settles on-chain. (b) transfer-then-prove — send the exact asset amount on Base, Polygon, Linea, zkSync Era, Scroll or Solana, retry with X-PAYMENT: <txHash|signature>. Repeat payers auto-receive loyalty discounts (-20% from 5th, -30% from 25th payment) — the 402 always carries your exact amount.'
      tags:
      - Fetch
      operationId: postApiFetch
      x-operation-id-source: derived