no2bounce

For RevOps and GTM engineers who need a dedicated email verification layer, no2bounce covers the core use case — bulk cleaning, real-time API checks, catch-all detection, and risk scoring — without a lot of noise around it. The REST API is available and documented, so you can wrap it into your own MCP layer or agentic enrichment pipeline without much friction; it's not MCP-native out of the box, but the API surface is clean enough to build on. Pricing is usage-based with 100 free credits to start, which is low-risk to test, though costs will scale as your list volume grows — budget accordingly if you're running high-frequency verification across large CRM segments. The honest ceiling here is that no2bounce is purely a verification tool: it won't tell you who to contact, only whether the address is safe to send to, so you'll need a separate enrichment or prospecting source feeding it.