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Why verify?
Unverified users cost you money.
Fake signups inflate your metrics. Bots drain infrastructure. Fraudulent accounts generate support tickets and chargebacks. One phone verification at signup changes the economics of your entire user base.
9¢
per verified user. Less than the cost of a single support ticket.
2
API calls to go from unknown visitor to verified real person.
5 min
OTP expiry. Short enough to be secure, long enough to be usable.
Without Sigil
✕ Fake accounts inflate your user count
✕ Bots sign up at scale with no friction
✕ No way to reach users if they lose access
✕ Fraud and chargebacks eat into margin
With Sigil
✓ Every account tied to a real phone number
✓ Bots can't pass SMS verification at scale
✓ Phone as a recovery and contact channel
✓ Verified users convert and retain better
How it works
Send the code
POST a phone number with your API key. Sigil generates a 6-digit OTP and delivers it via SMS in seconds.
Verify the code
POST the code back. Get verified: true. The number is confirmed. One credit used.
Rejection built in
Every SMS includes a rejection link. If the number is not theirs, the owner can cancel the attempt with one tap.
Pricing
Prepaid credits
Buy credits upfront. Each verified number costs 1 credit. No monthly fees, no contracts, no minimums beyond your first top-up.
€0.09 / verified user
Minimum top-up: €10 (111 credits)
Credits that are not used are not charged. If SMS delivery fails, the credit is refunded automatically.