Sift vs SignupDoggy — fraud API comparison for small teams (2026)

Sift is the 800-pound gorilla of fraud detection. SignupDoggy is a solo-founder project. Here is an honest comparison of features, price, and which one fits a 2-person SaaS team.

Sift vs SignupDoggy — 2026 fraud API comparison for small teams

Sift is the 800-pound gorilla of fraud detection. Acquired by Visa in 2024. Processes over 1 trillion events per year for some of the largest marketplaces and fintechs in the world. SignupDoggy is a solo-founder project launched in 2025 with $0 in funding. They are not competing products.

Sift is the right choice for marketplaces with $10M+ ARR that need payment-fraud scoring, account-takeover detection, content abuse detection, and promo abuse detection.

SignupDoggy is the right choice for 2-50 person SaaS teams that need to filter bot signups to keep their database clean.

PRICING (the headline number)

| Tier | Sift | SignupDoggy |
|---|---|---|
| Minimum spend | $2,000+/month (contact sales) | $5 (pay once) |
| Per-call cost | $0.05-$0.30 (quote-based) | $0.01 |
| Annual contract | Required | None |
| Free tier | No (30-day trial, sales-led) | No (live demo) |

Filtering 50,000 signups/month on Sift costs $7,500/month at the entry tier ($0.15/call). The same 50,000 signups on SignupDoggy cost $250 one-time. The 360x price difference is real.

WHAT SIFT HAS THAT SIGNUPDOGGY DOES NOT

- Payment fraud scoring (the actual strength of Sift)
- Account takeover detection
- Content abuse detection
- Promo abuse detection
- Manual review console
- Network-effect fraud signals across all Sift customers

WHAT SIGNUPDOGGY HAS THAT SIFT DOES NOT

- Self-service signup (5 minutes vs 4-week sales process)
- No sales call required
- No minimum spend beyond $5
- Disposable-email-first design
- $0.01 per call vs $0.05-$0.30 per call

The full comparison: /blog/sift-vs-signupdoggy-fraud-api-comparison.

If you are a 2-person SaaS reading this and considering Sift, you are over-buying. If you are a marketplace with $10M+ ARR reading this and considering SignupDoggy, you are under-buying.