Operations BroadNet answer

What is rate limiting in SMS?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

Rate limiting caps how many messages or requests are accepted in a given time window — per API key, per sender, or per destination number — to protect throughput, enforce fair use, and defend against abuse such as SMS pumping. It is expressed as a rate (for example messages per second) and is what keeps one runaway job or one attacker from degrading delivery for everyone.

Plain-language definitionVendor-neutralReviewed July 22, 2026

The long answer

Everything worth knowing, nothing that isn't.

§01

Why it exists

Operators and platforms allocate finite throughput, so a provider meters submission to stay within route capacity and honour fair-use terms. Rate limiting also blunts SMS pumping, where fraudsters trigger floods of OTPs to earn a cut of the traffic. See /answers/what-is-sms-pumping and /answers/what-is-tps.

§02

Where limits apply

Common dimensions are per API key (your account's overall submission rate), per sender ID or number, and per destination MSISDN (to stop repeated sends to one victim). Verification flows should cap OTP requests per number and per IP. See /answers/sms-otp-best-practices.

§03

How to work with it

Design senders to respect HTTP 429 / SMPP throttling responses with exponential backoff, batch large campaigns within your allotted rate, and request a higher limit ahead of a known spike rather than hitting the ceiling live. See /answers/what-is-throughput-sla.

§04

Rate limiting vs throttling

The terms overlap: rate limiting usually means a hard cap you must stay under, while throttling means the platform is actively slowing your traffic to a sustainable rate. Both protect delivery. See /answers/what-is-cps.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

Build with this

Need help wiring this up?

The pages below are the products and integration guides that put this concept on the wire. If you'd rather walk through it live, our engineering team takes calls same-day during MENA working hours.

Talk to our engineering team

Feedback

Was this answer helpful?

Your vote helps us prioritise which answers to expand with examples, diagrams, and code snippets.

Yes No

Thanks — noted. We'll keep this answer maintained.

Got it. Tell us what was missing — send a quick note.

How we write and review content

Talk to a real engineer about your build.

We reply within one business day, and production accounts get 24/7 support. Our solutions engineers ship code, not scripts.

Talk to support Speak with sales

$ curl -X POST https://api.broadnet.me/sms/sendSms

Response SLA

Test-access requestsReply within 1 business day

Production24 / 7 · < 15 min

Operator NOC24 / 7 · pager

support@broadnet.me · +971 4 456 7768