Telephony & SMS APIs let you add telephony & sms capabilities without building from scratch. Every entry below is profiled with trust signals — pricing model, authentication requirements, CORS support, rate limits, and live uptime checks — so you can compare options and pick production-safe choices instead of guessing from a link list.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| Abstract Phone Validation Validate phone numbers globally | Freemium | API Key | No | Profile | |
| Call Control API API for blocking phone calls with Call Control. Data is from crowdsourced community blacklist from 12+ million users and government agencies (FTC, FCC, IRS) Try with api_key 'demo', hit explore above, and then try phone | Unknown | Unknown | Yes | Profile | |
| CallFire API Documentation API CallFire | Unknown | Unknown | Yes | Profile | |
| Cloudmersive Validate Validate international phone numbers | Freemium | API Key | No | Profile | |
| ETSI GS MEC 010-2 - Part 2: Application lifecycle, rules and requirements management API ETSI GS MEC 010-2 - Part 2: Application lifecycle, rules and requirements management described using OpenAPI. | Unknown | Unknown | Yes | Profile | |
| NumlookupAPI Worldwide Phone Number Lookup & Verification API | Freemium | API Key | No | Profile | |
| Numverify API Phone number validation | Paid | API Key | Unknown | Profile | |
| Phone Specification Rest Api for Phone specifications | Free | No | No | Profile | |
| Proweblook Phone Number Checker Phone number validation | Freemium | API Key | No | Profile | |
| Proweblook Whatsapp Contact Checker Whatsapp number validation | Freemium | API Key | No | Profile | |
| Smartphone Test Farm API Control and manages real Smartphone devices from browser and restful apis | Unknown | Unknown | Yes | Profile | |
| Socio-demo API Socio-demo API can be used to obtain time-aggregated data representing groups of people on the given location in the Czech Republic. Having a location, the API can return count of people belonging to age group or gender | Unknown | Unknown | Yes | Profile | |
| Twilio - Api This is the public Twilio REST API. | Unknown | Unknown | Yes | Profile | |
| VeriRoute Intel API CNAM caller ID, carrier/LRN lookup and spam scoring for North American phone numbers | Paid | API Key | Unknown | Profile | |
| Veriphone Phone number validation & carrier lookup | Freemium | API Key | No | Profile | |
| topupsapi Polls is a simple API allowing consumers to view polls and vote in them. | Unknown | API Key | Yes | Profile |
Start with pricing and auth: free tiers and no-auth APIs are fastest to prototype with. Then check CORS if your app calls the API from the browser, and health before you commit — a great API that's been down for a week will block your launch. Each profile below shows all of these signals plus rate limits where documented.