Icypeas verifies via SMTP as well. The difference is in the edge cases: Coalstoke's pattern engine adapts per domain, and results on protected mail systems (Proofpoint, Microsoft 365) return a confidence-scored status instead of a silent "not found."
| Feature | Coalstoke | Icypeas |
|---|---|---|
| Free tier | 50 credits, no card | Icypeas — limited trial or none |
| Per-credit price (equiv plan) | $0.0019 (Growth) | see table below |
| Pricing model | per workspace | Icypeas — often per seat |
| Status codes | deliverable · catch_all · protected · undeliverable | usually pass/fail only |
| Catch-all handling | confidence-scored guess (opt-in) | often silently marks as "found" |
| Proofpoint/O365 | returns protected + guess | usually returns "not found" |
| BYOK fallback | yes — plug in any provider key as backup | no |
| Per-domain pattern learning | yes — improves with every lookup | partial |
| Bulk API | 10,000 items/job + webhook | varies |
| Live stats dashboard | public /stats page — every verdict | no |
Live-fetched from our competitor database. Coalstoke rows are highlighted.
| Provider | Tier | Monthly | Credits | Per credit | vs. our Growth |
|---|---|---|---|---|---|
| Icypeas Standard | flat | $86 | 6,000 | $0.014 | 7.4× more |
Our SMTP layer runs first on every lookup. Domains it can't verify directly get routed to your Icypeas key. You pay Icypeas only for the fallback fires. Numbers below are what you actually keep.
Zero risk. Keep your Icypeas subscription; plug the key into our BYOK fallback and let us handle the domains our SMTP fleet cracks directly for free.
Start free — 50 credits