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Nick Davies
Nick Davies

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Best Marketing APIs for Developers in 2026

Need marketing data for your app? Here are the best APIs available on APILayer for marketing.

1. Numverify

Global phone number validation & lookup

Validate phone numbers in real-time for 232 countries. Returns carrier info, line type (mobile/landline), and location data.

Try Numverify free


2. Userstack

User-Agent string lookup API

Detect and parse user agents in real-time. Returns browser, OS, device type, and bot detection data for any User-Agent string.

Try Userstack free


Why APILayer?

All these APIs work under one account and one API key. Sign up once, get access to 40+ APIs. No credit card required.

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