# Services from ai.rjhsignaltech.workers.dev on Zero

> ai.rjhsignaltech.workers.dev serves 3 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/ai.rjhsignaltech.workers.dev
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/ai.rjhsignaltech.workers.dev/health.json

## Services

- [SPF and DMARC Record Checker with Email Deliverability Validation](https://www.zero.xyz/c/spf-and-dmarc-record-checker-with-email-deliverability-validation-1236d82d/llms.txt): $0.005/call via x402. Validates an email address by checking DNS records (MX, SPF, DMARC), domain existence, disposability, and deliverability using two independent resolvers, without opening an SMTP connection.
- [SPF and DMARC Record Checker (RJH Signal Technologies)](https://www.zero.xyz/c/spf-and-dmarc-record-checker-rjh-signal-technologies-9073e3ae/llms.txt): $1/call via x402. Fetches and analyzes SPF and DMARC DNS records for a given domain using two independent resolvers, counting SPF lookup budget against RFC 7208 limits and breaking down results clause by clause.
- [RJH Signal Technologies Web Page Reader (SPF/DMARC Context)](https://www.zero.xyz/c/rjh-signal-technologies-web-page-reader-spf-dmarc-context-78194061/llms.txt): $0.02/call via x402. Fetches and extracts structured text, links, metadata, and headings from any given HTTPS URL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)