Hunter.io is where outbound teams search company domains, find likely work email addresses, and verify whether a contact record is safe enough to use. A Hunter.io AI assistant is most useful when it helps reps and growth teams compare domain coverage, find the best contact path, verify deliverability, and turn lookup results into cleaner outbound decisions from Slack instead of tab-hopping across searches and spreadsheets. If you are running OpenClaw yourself, Hunter is still a relatively approachable integration to wire up, but Cody is the faster path if you want the assistant experience instead of the API glue.
How OpenClaw Integrations Work
OpenClaw is a self-hosted AI assistant that runs on your own server — typically an EC2 instance — and connects to Slack. It uses Claude under the hood to process requests. Out of the box, OpenClaw doesn't ship with pre-built connections to third-party tools. Instead, integrations are built using the skills system: markdown files in ~/.openclaw/skills/ that give Claude instructions for a particular domain, combined with HTTP tool calls to any API you expose to it.
In practice, adding a real integration means: getting API credentials from the third-party service, building or configuring a small proxy/endpoint that OpenClaw can call, and writing a skill file that tells Claude how to use it. For some tools this is an afternoon of work. For others — like Hunter.io — it's considerably more involved.
Connecting OpenClaw with Hunter.io: Step by Step
Step 1: Get Your Hunter API Key and Decide the Lookup Workflows That Matter
Log into Hunter.io and go to API in the top navigation to copy your API key. Before wiring anything up, decide which lookup flows your team actually needs in Slack, for example domain search for company coverage, email finder for named contacts, or email verification before a sequence goes live. The Hunter API base URL is https://api.hunter.io/v2/, and requests use your key as the api_key query parameter.
Step 2: Expose Domain Search, Email Finder, and Verification Through a Small Proxy
The core Hunter endpoints are /domain-search for company-domain results, /email-finder for named-contact lookups, and /email-verifier for deliverability checks. Wrap those in a small proxy so OpenClaw can ask cleaner questions like "show me the best emails at this company" or "is this address safe enough to use" without exposing raw API details in every prompt.
Step 3: Write the Skill File Around Confidence, Verification, and Handoff Decisions
Write ~/.openclaw/skills/hunter.md with the available lookup types, how Hunter confidence should be interpreted, what verification outcomes mean for outbound safety, and how Claude should present ambiguous results. The important behavior is not just returning emails, but helping the team distinguish safer addresses from risky ones and turning lookup results into a usable outbound handoff.
Challenges and Caveats
Monthly Credits Disappear Faster Than Teams Expect
Hunter usage counts against a monthly credit budget, and domain searches or repeated verification passes can burn through that budget quickly when multiple reps are using the tool conversationally. Cache repeat lookups where possible and avoid re-running the same search unless something actually changed.
Confidence and Verification Help, but They Do Not Eliminate Risk
Hunter confidence scores and verification statuses are useful signals, not guarantees. Lower-confidence results can still bounce, and even stronger-looking addresses may need human judgment before they go into a live sequence. Your assistant should present verification and confidence as decision support, not as certainty.
Domain Results Can Get Noisy Without Prioritisation
A company-domain search can return many contacts, patterns, and partial records. If the assistant simply dumps those results into chat, it creates more work instead of less. The useful version is one that highlights the most likely addresses, the observed pattern, and the contacts worth acting on first.
Skip All of This — Use Cody Instead
Cody gives your team a Hunter.io AI assistant in Slack, so people can search domains, find likely work emails, verify deliverability, and clean up outbound lists without wiring API keys or building email-finding workflow glue themselves.
Related Guides
- Connecting OpenClaw with Apollo: A Practical Guide
- Connecting OpenClaw with Clay: A Practical Guide
- Connecting OpenClaw with Instantly: A Practical Guide
Need the model-flexible version? See: How to Connect Hunter.io to OpenClaw: Setup, Models, and Workflow Guide.