1 Best APIs for VoIP Detection in Nigeria

Abstract API Phone Validation is a REST API that validates phone numbers and returns carrier intelligence, line type classification, geographic data, and fraud signals for numbers across 190+ countries and territories. Part of Abstract API's broader suite of data validation APIs (email, IP, VAT, and more), the Phone Validation API is accessible under the same API key used for all Abstract API products — reducing credential management overhead for teams already using Abstract APIs for other validation tasks. The API maintains a large and frequently updated database of phone numbers, carriers, and number types including mobile, landline, VoIP, and disposable numbers — making it useful not just for formatting validation but for fraud detection during user onboarding. ## What the API Does Submitting a phone number to Abstract's validation endpoint returns: - **Validity**: Whether the number is valid and properly formatted. - **Format**: E.164 international format and local format. - **Country**: Country name and ISO code (NG for Nigeria). - **Location**: Regional or city-level data where available. - **Carrier**: Mobile network operator name. - **Line type**: Mobile, landline, VoIP, toll-free, or unknown. - **Is disposable**: Flag for disposable/temporary number services. For Nigerian numbers, this returns the carrier (MTN Nigeria, Airtel Nigeria, Globacom, or 9mobile), the line type, and the country/region data associated with the number prefix. ## How Developers Use It Simple GET request: `GET https://phonevalidation.abstractapi.com/v1/?api_key=YOUR_KEY&phone=2348012345678`. The `api_key` is passed as a query parameter. The phone number can be provided with or without country code. Response is a JSON object returned immediately. ## Pricing & Fees Abstract API Phone Validation requires a paid plan for production use: - **Starter**: $19/month — 1,000 API calls, 3 requests/second. - **Basic**: $39/month — 25,000 calls, 5 req/sec. - **Standard**: $69/month — 50,000 calls, 10 req/sec, multiple API keys. - **Business**: $99/month — 100,000 calls, 20 req/sec. - **Professional**: $199/month — 250,000 calls. - **Growth**: $499/month — 650,000 calls. A free trial is available on signup for initial testing. ## Authentication API key passed as a URL query parameter (`api_key=YOUR_KEY`) on every request. The same API key unlocks all Abstract API products under one account. ## Rate Limits Rate limits are per-plan: 3 req/sec on Starter, scaling to 100 req/sec on Growth. Requests exceeding the per-second limit are queued or rejected depending on plan settings. ## Compliance Abstract API processes phone numbers for validation purposes under GDPR-compliant data handling policies. Numbers are not stored for marketing or secondary use beyond the immediate validation request. ## Challenges & Gotchas for Nigerian Developers 1. **No free tier**: Unlike some competitors, Abstract API Phone Validation requires a paid plan for sustained use. The Starter plan at $19/month may feel expensive for low-volume Nigerian startups. 2. **No SIM Swap detection**: Abstract API does not provide SIM Swap signals — use Twilio Lookup for this capability. 3. **Carrier accuracy with number portability**: As with all carrier lookup services, Nigerian number portability (MNP) can cause carrier misidentification after a user switches networks. 4. **USD billing**: Abstract API charges in USD. Nigerian developers need a USD-capable payment method. 5. **Rate limits matter**: The 3 req/sec limit on the Starter plan can be a bottleneck if your registration flow triggers multiple validation calls simultaneously. ## Company Background Abstract API is a San Francisco-based API company offering a suite of simple, developer-focused data validation and enrichment APIs. The phone validation product is one of several offerings, alongside email verification, IP geolocation, VAT validation, and more. All products are accessible under a single account with a unified API key. ## Frequently Asked Questions **Q: Does Abstract API support Nigerian phone numbers (+234)?** A: Yes. Nigeria is included in the 190+ country coverage with carrier and line type identification. **Q: Is there a free tier?** A: A free trial is available on signup for initial testing. Sustained production use requires a paid plan starting at $19/month. **Q: Can I use one API key for phone, email, and IP validation?** A: Yes. A single Abstract API account key provides access to all Abstract API products including phone, email, IP, and VAT validation.