Sift vs SignupDoggy: the 2026 fraud API comparison for small teams — SignupDoggy Blog

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 that just needs to filter 5,000 signups a month.

Sift vs SignupDoggy: the 2026 fraud API comparison for small teams

Sift is the 800-pound gorilla of fraud detection. Acquired by Visa in 2024, the company 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 the same product, and they are not aimed at the same buyer.

This post is for the 2-person SaaS team that needs to filter 5,000 signups a month and is wondering if they need a 'real' fraud API. The answer is: probably not Sift. The answer is probably also not nothing. The answer, in 2026, is usually SignupDoggy or a comparable indie-tier provider.

Short answer

Sift is the right choice if you are a marketplace with $10M+ ARR, a chargeback rate over 0.5%, and a dedicated fraud analyst on staff. The platform handles payment fraud, account takeover, content abuse, and promo abuse. It is overkill for signup-quality scoring.

SignupDoggy is the right choice if you are filtering signups to keep your database clean, your Mixpanel funnel honest, and your support inbox from filling up with 'I never got the verification email' tickets from `tempmail.com`. It is the signup-quality scoring that 95% of SaaS companies actually need.

Pricing

| Tier | Sift | SignupDoggy |
|---|---|---|
| Minimum spend | Contact sales (typically $2k+/month) | $5 (pay-once, no expiry) |
| Per-call cost | Quote-based, typically $0.05-$0.30 | $0.01 |
| Annual contract | Required | None |
| Free tier | No | No (live demo at /demo) |
| Trial | 30 days, sales-led | 0 minutes, self-service |

The Sift pricing is quote-based, which is itself a signal. You will spend 2-4 weeks in the sales process before you see a price. The price you get quoted will depend on your volume, your industry, and your negotiation skill. The lowest published price for any Sift tier is around $0.05 per call at $10k/year commit. The highest is $0.30 per call at the entry tier for low-volume customers.

Concrete number: filtering 50,000 signups a month on Sift costs $7,500/month ($0.15 per call at the entry tier) on their published pricing. The same 50,000 signups on SignupDoggy cost $250 one-time (25,000 credits at $0.01/credit, 2 packs). The 360x price difference is real.

What Sift does that SignupDoggy does not
• Payment fraud scoring. Sift is built for chargeback prevention. It scores transactions, not just signups. If you process credit cards and your chargeback rate is the actual problem, Sift is one of the best tools in the world.
• Account takeover detection. Sift tracks devices across sessions and flags logins from new devices, new locations, and new user agents. Useful for marketplaces where account takeover is the primary abuse vector.
• Content abuse detection. Sift scores user-generated content (listings, messages, reviews) for spam, scams, and abuse. If your platform has user-generated content, this matters.
• Promo abuse detection. Sift tracks referral codes, coupon usage, and signup bonuses to identify users who are gaming your acquisition programs.
• Manual review console. Sift ships with a real fraud-analyst dashboard. Your fraud team can review, override, and annotate decisions.
• Network effects. Sift's biggest moat is the network: every fraud signal from every Sift customer feeds into the model. A new fraud pattern seen at one customer is detected everywhere within hours.

What SignupDoggy does that Sift does not
• Self-service signup. You have an API key in 5 minutes. No sales call. No business email required.
• No annual contract. Stop using it tomorrow.
• Disposable-email-first design. SignupDoggy is built around catching `tempmail.com` and the 199,999 other disposable-email domains. Sift does not focus on this.
• 5-minute integration. One HTTP call. That is it.
• $5 minimum. You can try the entire product for the price of a coffee.
• Live demo at `/demo`. Test the API in your browser without signing up.
• Email-based support. Jeffrin answers within a day.

Use-case-specific recommendations

Marketplace, fintech, payment processor:
• Sift. You are processing transactions, chargeback rate is the actual problem, and you need network-effect fraud signals. Sift is built for this.

B2B SaaS, project management, dev tools:
• SignupDoggy. You are filtering signups to keep your database clean. Sift's payment-fraud features are wasted on you.

Consumer app, social network, dating:
• Sift for content abuse and account takeover. SignupDoggy for the initial signup-quality gate. Run both. Sift for in-product behavior, SignupDoggy for the front door.

Indie hacker, side project, $0-1k MRR:
• SignupDoggy. No question. The minimum purchase is $5.

The bottom line

Sift and SignupDoggy are not competing products. Sift is a payment-fraud and account-takeover platform built for marketplaces with $10M+ ARR. SignupDoggy is a signup-quality scoring API built for SaaS teams that need to filter bot signups.

If you are a 2-person SaaS team reading this and considering Sift, you are over-buying. SignupDoggy will solve the actual problem (bot signups polluting your database) at 1/360th the cost.

If you are a marketplace with $10M+ ARR reading this and considering SignupDoggy, you are under-buying. Sift is what you need.

FAQ

Q: Can I use Sift and SignupDoggy together?
A: Yes. SignupDoggy for the initial signup gate, Sift for in-session behavior. The two APIs do not overlap.

Q: Does Sift have a free tier?
A: No. There is a 30-day trial, but it requires a sales call.

Q: Does SignupDoggy have a free tier?
A: No paid free tier, but there is a live demo at /demo that lets you test the API in your browser.

Q: What about the recent Sift acquisition by Visa?
A: Sift was acquired by Visa in 2024. The product is still sold independently and the API has not changed. Long-term, expect tighter integration with Visa's payment network.

Q: Can I migrate from Sift to SignupDoggy?
A: Yes, if you are only using Sift for signup-quality scoring (not payment fraud). Migration is a 1-day refactor.

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About the author

Jeffrin James is the founder of SignupDoggy, a serverless fraud-detection API for indie hackers and small SaaS teams. He built the product in Mumbai, India, after spending six months and $2,400 on enterprise fraud-detection vendors that didn't fit his use case.

Tags: Sift, Comparison, Fraud API, Indie hackers