eKYC and Aadhaar verification API gateway for Indian fintechs
Aadhaar Bridge APIs (offered by certified partners like Digio or Signzy) are essential for any fintech operating in India. Under UIDAI and RBI guidelines, verification must route through secure gateways to prevent data leaks. Aadhaar Bridge enables instant eKYC (OTP-based) and offline XML verification, maintaining verification success rates above 92%. The primary bottleneck is the dependency on UIDAI government servers—which suffer from latency drops during peak hours—requiring fintechs to design clean callback retry screens.
Aadhaar Bridge refers to a suite of APIs and SDKs provided by authorized intermediaries (such as Digio, Signzy, or HyperVerge) that connect fintech platforms to the UIDAI central database. Since private companies cannot query the UIDAI servers directly without certified hardware and security keys, Aadhaar Bridge providers act as compliant gateways, translating requests and returning masked user verification records.
Where Aadhaar Bridge wins: compliance with UIDAI security rules, instant verification latency (<2 seconds under normal load), and automated digital signature integrations. Where Aadhaar Bridge fails: transaction fee costs, and occasional government server timeouts that cause OTP failures at checkout.
OTP-based user verification. Send a request to trigger a UIDAI OTP to the user's registered phone, verifying their name, DOB, and address instantly.
Integrate certified fingerprint or iris scanners for in-person customer onboarding (agent verification). Extensively used by microfinance and lending agencies.
Compliant alternative to paper copies. Users upload a secure, password-protected XML zip from UIDAI, verifying their data offline without OTP latency.
Allows users to sign loan agreements or mutual fund mandates digitally using Aadhaar OTP authentication, satisfying legal audit requirements.
| Feature | Aadhaar Bridge (eKYC) | Offline KYC (Physical/XML) |
|---|---|---|
| Verification latency | ✓ Instant (<2 seconds) | Hours/Days |
| RBI compliance status | ✓ Fully certified for fintechs | Requires manual audit |
| Transaction cost | ₹5–₹15 per txn | ✓ Free or very cheap |
| Government server downtime | Vulnerable to timeouts | ✓ Works independently |
| User friction | ✓ Low (OTP entry) | High (document uploads) |
| Data masking (UIDAI rules) | ✓ Automated masking | Manual workaround needed |
Intermediaries charge a setup fee alongside transaction-based fees. High-volume fintech platforms can negotiate lower transaction rates.
Per successful OTP-based eKYC transaction. Standard setup fee of ₹5,000 applies. Includes masked Aadhaar card PDF return.
Per successful eSign transaction. Complies with legal audits for loan and investment contracts, automating onboarding agreements.
⚠️ Security Note: UIDAI guidelines mandate that Aadhaar numbers must not be stored in clear text. You must mask the first 8 digits in your database, storing only the final 4 digits alongside the secure token.
When the central UIDAI government gateways experience high latency or complete downtime, OTP-based eKYC verifications fail. This directly leads to signup drops at checkout. To protect conversion rates, fintech platforms should integrate Offline Aadhaar XML verification as a fallback channel. Under this flow, the user downloads a secure, password-protected XML zip file directly from the UIDAI portal and uploads it to your application. Your backend extracts the ZIP, verifies the digital signature from UIDAI, and confirms the customer's name, gender, and address without requiring an OTP transaction.
Offline XML verification acts as a fail-safe. If the OTP verification timeouts exceed 15 seconds, the application UI can automatically slide in the XML upload option. This keeps onboarding rates stable, reduces merchant drop-offs, and ensures compliance with RBI guidelines, matching the conversion strategies discussed in the Why Users Drop Off Before KYC playbook.
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