Agents can find an address. They cannot tell whether it exists.
Agents doing lead research, data cleanup or outbound prep all hit the same wall. They return a list that looks authoritative and is twenty percent fictional — and an agent that confidently returns a plausible but fabricated address is worse than one that returns nothing.
Wrapping a REST API in a custom tool definition is work you redo in every framework. MCP is the standard interface, and MailValid speaks it natively.
How it works
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1
Add the MailValid MCP server to your client's config with your API key.
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2
The agent gains
verify_emailandverify_bulkas callable tools. -
3
Ask in plain language — find the CTO's email and confirm it is deliverable — and the agent verifies before it answers.
What it unlocks
Lead research agents that return a confidence-scored list instead of a plausible-sounding one.
CRM cleanup agents that check a record before flagging it stale.
Signup abuse triage, where an agent inspects a suspicious cohort and explains what it found.
Data enrichment pipelines where verification is one step in a chain the agent orchestrates itself.
Why this matters now
Almost no verification vendor ships an MCP server. If you are building agentic workflows today, the alternative is writing and maintaining your own tool wrapper against someone's REST API, in every framework, indefinitely.
Which clients work?
Claude Desktop, Claude Code, Cursor and any MCP-compatible client.
Does it cost extra?
No. Same $0.00075 per email, same credit balance.
Can an agent burn my credits?
Credits draw from your balance like any other call. Use a scoped key and cap the balance for agent workloads.
Does it support bulk?
Yes. The agent can hand off a list and receive per-address results.
Can I still use the REST API?
Yes. MCP is an additional interface, not a replacement.
Connect the MCP server — 100 free credits, no card required.