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Keyri (YC S21) — Secure fraud prevention and authentication platform for developers

Keyri helps companies implement simple, secure anti-fraud and authentication solutions to delight users and keep bad actors off their platform. Keyri's mobile application and browser fingerprinting suite ties user identities to trusted devices, preventing fraudulent activity such as account opening, account takeovers, bot attacks, and referral/promo abuse.

Keyri is a Y Combinator company in the Summer 2021 batch. Its directory entry describes it as: Secure fraud prevention and authentication platform for developers. The founders listed are Zain Azeem (Founder), Saif Malik (Founder) (Y Combinator directory entry, July 29, 2021).

6 more companies from YC Summer 2021 ↓

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Keyri

New accelerator entry · 2021-07-29 · the record

Summer 2021
batch
5
people
Early
stage
United States of America
region
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What the record says

BatchSummer 2021
Announced2021-07-29
StageEarly
StatusAcquired
Team size5
IndustryB2B
Sub-industryB2B -> Security
SectorsSaaS, B2B, Security
RegionsUnited States of America, America / Canada, Remote, Fully Remote
BasedSan Francisco, CA, USA; Remote
HiringNo
Sitehttps://keyri.com/
Founded2021

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Also in YC Summer 2021

Same batch, B2B first.

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In their words

Keyri helps companies implement simple, secure anti-fraud and authentication solutions to delight users and keep bad actors off their platform. Keyri's mobile application and browser fingerprinting suite ties user identities to trusted devices, preventing fraudulent activity such as account opening, account takeovers, bot attacks, and referral/promo abuse. Keyri is able to establish an immutable device fingerprint for every device, alerting companies of any suspicious devices during sign up, log in, or subsequent authentication events. Keyri also offers a passwordless authentication suite that leverages Passkeys, WebAuthn, and QR codes to enable biometric authentication on all platforms and devices, providing a seamless user experience, strengthening multi-factor account security, and reducing reliance on other tedious and unsecure authentication methods.

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  3. What They Do, And How The Money Works

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  5. The Money: Funding, Valuation, Runway

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Keyri: Accepted into Y Combinator Summer 2021
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Permanent URL: https://mentionfox.com/funding/yc-keyri
Last updated 2026-10-27
Primary record: Y Combinator directory entry
Keyri (YC S21) — Secure fraud prevention and authentication platform for developers. MentionFox, 2026-10-27. https://mentionfox.com/funding/yc-keyri