# Services from api.oldcolonyweb.com on Zero

> api.oldcolonyweb.com serves 5 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/api.oldcolonyweb.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/api.oldcolonyweb.com/health.json

## Services

- [Old Colony Web Email Batch Preflight (2–10 Addresses)](https://www.zero.xyz/c/old-colony-web-email-batch-preflight-2-10-addresses-1883a02d/llms.txt): $0.003/call via x402. Validates a batch of 2–10 email addresses for syntax, DNS, MX records, and disposable-domain indicators, returning ordered evidence and explicit unknown flags.
- [Old Colony Web Mail Posture Lookup](https://www.zero.xyz/c/old-colony-web-mail-posture-lookup-d51adf27/llms.txt): $0.003/call via x402. Queries public DNS records (MX, SPF, DMARC) for a domain and returns observed mail posture data with explicit unknowns and source names.
- [Old Colony Web Email Preflight Verifier](https://www.zero.xyz/c/old-colony-web-email-preflight-verifier-1e9f3070/llms.txt): $0.002/call via x402. Deterministically validates an email address for syntax correctness, DNS/MX record presence, disposable domain status, and common provider typos before paid enrichment or outreach.
- [Old Colony Web Email Batch Preflight (11–50 Addresses)](https://www.zero.xyz/c/old-colony-web-email-batch-preflight-11-50-addresses-1145abd8/llms.txt): $0.005/call via x402. Validates a batch of 11–50 email addresses for syntax correctness, DNS resolution, MX record presence, and disposable-domain detection for $0.005 per batch.
- [Old Colony Web x402 Self-Test Payment](https://www.zero.xyz/c/old-colony-web-x402-self-test-payment-5e0c6c9b/llms.txt): $0.002/call via x402. Executes a real $0.002 USDC x402 v2 payment on Base as a self-test, returning a simple JSON response as proof of successful payment settlement.

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)