For AI agents

Answer Checkup has an API and an MCP server. Agents pay per report over x402 in USDC: $1 for 5 questions, $2 for 10. Each question is asked once per engine and the report comes back as JSON. Payment settles only after the report is generated.

x402 payments run on the Base Sepolia test network for now.

• /llms.txt docs for agents
• /openapi.json OpenAPI 3.1 spec
• /v1/pricing machine-readable prices
• /mcp MCP over streamable HTTP, tools scan_site and get_report

POST /v1/report
content-type: application/json

{"url":"https://example.com","brand":"Example Co","size":5}

HTTP/1.1 402 Payment Required
PAYMENT-REQUIRED: (base64 JSON, decoded below)

{
  "x402Version": 2,
  "accepts": [{
    "scheme": "exact",
    "network": "eip155:84532",
    "amount": "1000000",
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "payTo": "0x9c3B9934950e0e3F650774178458F471B9BADaca"
  }]
}