# Spaw vs Verifalia: email verification API comparison

How Spaw and Verifalia compare on pricing, billing rules, verification depth and limits, from Verifalia's public pages checked on 2026-09-03. Corrections: support@spaw.co.

| | Spaw | Verifalia |
| --- | --- | --- |
| Pricing model | Pay-as-you-go credit packs bought through Stripe Checkout; no subscription, credits never expire | Pay-as-you-go credit packs that never expire, or monthly, quarterly and yearly subscriptions; verification depth is priced as quality levels |
| Free tier | 10 free credits every month, no card required | 25 free credits a day on the Free plan; unused daily credits expire each day |
| Price per 1,000 at about 10k | $7.80 (Growth pack: 5,000 credits for $39) | not published |
| Price per 1,000 at about 100k | $4.99 (Volume pack: 100,000 credits for $499) | not published |
| Unknown or catch-all results billed | Yes, by verdict: a deliverable or risky answer costs 1 credit even when the mailbox is unconfirmed; the automatic re-checks are free | not published |
| Undeliverable results billed | No, undeliverable verdicts are always free | not published |
| SMTP mailbox check | Yes | not published |
| Catch-all handling | A catch-all answer is remembered per domain for 7 days, and every unconfirmed mailbox carries a published 0 to 100 mailbox_confidence estimate | not published |
| Bulk limit | 100,000 addresses per bulk job, with an HMAC-signed completion webhook | Lists up to 100 MB, about 72 million addresses per list |
| Batch API | 50 addresses per synchronous request, probes sent concurrently | not published |
| Rate limit | 5 requests per second per key | Configurable throttling; fixed limits not published on the pages checked |
| Official SDKs | Python, Node.js, PHP | .NET, Java, Node.js, Ruby, PHP, Go |
| Data retention | Lookup history kept for 30 days, then pruned; test addresses are never logged | Configurable from 5 minutes to 30 days, deletable any time; since October 2025 deleted jobs keep an anonymized reference for up to 24 months |

## When Verifalia fits better

Developers who want to tune verification depth per request, official SDKs in six languages, and configurable retention.

- Standard, High and Extreme quality levels cost 1, 2 and 4 credits per verification
- Subscriptions include daily free credits, from 250 a day on Starter to 25,000 a day on Ultimate
- States that data is processed in memory rather than stored persistently

## When Spaw fits better

Developers who want one flat price per answered lookup, a transparent risk score, and an API that documents every field.

- Verifalia prices depth as 1, 2 or 4 credits per verification; Spaw runs its full pipeline including the SMTP handshake for 1 credit
- Spaw bills nothing for undeliverable verdicts and repeats within 7 days
- Verifalia's daily free credits expire each day; Spaw's monthly credits accumulate
- Verifalia lists SDKs in six languages; Spaw ships Python, Node.js and PHP clients and an OpenAPI document

## Questions

**Does Spaw charge for catch-all or unknown results?** Spaw bills per answer, not per probe outcome: a lookup that comes back deliverable or risky costs 1 credit even when the mailbox could not be confirmed, for example on a catch-all domain or after greylisting. Undeliverable verdicts, invalid input, repeats within 7 days and the automatic re-checks behind callback_url are free. Verifalia does not publish how it bills them.

**Can I move a list from Verifalia to Spaw?** Yes. Upload the CSV to the dashboard or POST it to the bulk endpoint; Spaw keeps your columns, adds the verdict columns, and lets you download only the deliverable, risky or undeliverable rows. Addresses that come back undeliverable join your suppression list so later runs skip them for free.

**Is there a free tier?** Every Spaw account receives 10 free credits at the start of each month with no card on file, and unused credits accumulate. Verifalia offers: 25 free credits a day on the Free plan; unused daily credits expire each day.

## Sources (checked 2026-09-03)

- [Verifalia pricing](https://verifalia.com/pricing)
- [Verifalia developers](https://verifalia.com/developers)

Verifalia is a trademark of its owner. Spaw is not affiliated with it.

Reference: https://spaw.co/compare/verifalia