For Developers

DND Filter API — Real-Time DND Status Checking

A simple REST API for checking the DND status of Indian mobile numbers programmatically — plug it into your CRM, lead form, or campaign platform so lists are filtered before a promotional message ever gets queued.

The DND Filter API lets your application check whether a mobile number is DND-registered without a human using the web-based checker. It's the same underlying data — the official TRAI/NCPR registry — exposed programmatically so you can filter numbers automatically as part of your own signup flow, CRM sync, or campaign pipeline.

How It Fits Your Workflow

Instead of exporting a list and running it through the web checker before every campaign, the API integrates DND checking directly into the systems you already use:

Check a single number the moment it's captured — at signup, in a lead form, or during a CRM sync — so DND numbers never enter your promotional list in the first place.
Check numbers in bulk as part of a scheduled job before a campaign goes out, instead of a manual upload-and-download step.
Same authoritative TRAI/NCPR data source as the DND Number Checker and DND Scrubbing Service — the API just changes how you access it.

Integration & Access

Access is issued per business, with authentication and endpoint documentation provided directly to your development team once you're onboarded — so your developers integrate against the real, current API reference rather than a generic public spec. This also lets us match the integration to how you actually send campaigns (single-check inline, or bulk-check as a batch job).

Request API Access

Pricing

API access is billed per call, with volume-based rates for higher usage — the same underlying pricing model as the DND Number Checker, adapted to your expected call volume. Contact our team for a quote and current rate limits for your plan.

Frequently Asked Questions

How do I get an API key?

Sign up for a developer account and generate an API key from your dashboard. Contact our team if you need help getting started or want a key issued directly.

Is there a single-check and a bulk-check endpoint?

Yes. A single-check endpoint accepts one mobile number per request and returns its DND status instantly. A bulk-check endpoint accepts an array of numbers in one request for checking many numbers programmatically without looping single calls.

What data source does the API use?

The API checks numbers against the official TRAI/NCPR DND registry, the same authoritative source used for the web-based DND Number Checker and DND Scrubbing Service.

Are there rate limits?

Yes, API usage is subject to rate limits tied to your plan. Contact our team to confirm current limits and discuss higher-throughput plans for high-volume integrations.

How is API usage priced?

Pricing is based on the number of API calls made per billing cycle, with volume-based rates for higher usage. Contact our team for a quote matched to your expected call volume.

Which programming languages do you provide examples for?

The API is a standard REST/JSON interface, callable from any language that can make HTTP requests. Documentation includes examples in cURL, PHP, and Node.js, matching the same integration pattern used across MetaReach's other messaging APIs.

Request API Access Chat on WhatsApp

Related Services

Prefer a web interface over an API? Use the DND Number Checker for manual single or bulk lookups. Managing a large recurring database? See the DND Scrubbing Service. Looking for our general messaging API? Check the main SMS & WhatsApp API page.