Can I try the domain diagnostics API for free?
Yes. The free developer plan is intended for evaluation and small workflows. Current quotas are shown during registration and in the developer account.
DEVELOPER PLATFORM / REST + MCP
Domain signals, ready for software.
Move from a one-off browser check to repeatable domain intelligence. One API key unlocks structured DNS and email-authentication results over REST and Streamable HTTP MCP.
01 /
Diagnostics that fit the workflow.
Use the same underlying signals in onboarding checks, domain enrichment, configuration audits, monitoring jobs, support tooling, and agent-driven investigations.
- Validate customer DNS and mail configuration during onboarding.
- Enrich a domain record without maintaining resolver and parser infrastructure.
- Give an AI agent bounded, read-only tools for reliable DNS investigation.
- Return stable JSON envelopes and error codes to production software.
02 /
One key. Two interfaces.
REST and MCP share authentication, quotas, validation, and result semantics. Start with a direct HTTP call, then expose the same domain capabilities to compatible agents without building a second integration.
- Bearer-token authentication with keys displayed once and stored as hashes.
- Standard-style rate-limit headers and a consistent success/error envelope.
- Public-domain validation to prevent requests to private and reserved networks.
REST / QUICK START
Connect with the interface you already use.
curl -H "Authorization: Bearer nt_live_…" \
+ "https://nerdtools.co.uk/api/v1/email/dmarc?domain=example.com"FAQ /
Operational detail.
Do REST and MCP use different credentials?
No. Both interfaces use the same NerdTools API key and consume the same plan quota.
Does the API scan private systems?
No. NerdTools validates targets and restricts diagnostic requests to public domains and public IP infrastructure.