# DomainSignal

DomainSignal is an x402 v2 pay-per-call API for deterministic domain qualification and email-security evidence.

Base URL: https://api.servocenter.com
Network: Base mainnet (eip155:8453)
Currency: USDC
API keys: none
Payment: x402 v2 in the PAYMENT-REQUIRED / PAYMENT-SIGNATURE headers

## Free discovery
- GET /api/health
- GET /capabilities.json
- GET /pricing.json
- GET /openapi.json

## Paid endpoints
- GET /api/v1/domain/classify?domain=example.com — 0.0001 USDC
- GET /api/v1/domain/dns-audit?domain=example.com&selector=google — 0.001 USDC
- GET /api/v1/domain/full-profile?domain=example.com&selector=google — 0.005 USDC
- POST /api/v1/domain/batch-classify with JSON {"domains":["example.com"]} — 0.01 USDC for up to 100 domains

All paid endpoints return HTTP 402 with machine-readable payment terms when called without a valid payment signature.