SMS API providers in Poland compared (2026): SMSAPI, SerwerSMS, Twilio and more

This roundup was written by the SENDLY team – we say so openly so you can read it with the right amount of scepticism. Instead of a single "overall score", we compare providers on the criteria that actually drive cost and convenience:

• Billing model – pay-as-you-go or bundles/subscription (usually a bigger cost difference than the headline rate; we did the maths in our SMS pricing guide).
• Message route – a carrier with its own infrastructure or an aggregator reselling third-party routes.
• API and documentation – REST, authentication, delivery webhooks, time to first SMS.
• Billing and invoices – PLN or USD/EUR, VAT invoice, minimum top-ups.
• Sender ID – whether a custom sender name is available and on what terms.
• Integrations – ready-made plugins (e-commerce, PBX) and support for new scenarios such as AI agents.

Data as of July 2026. Competitor pricing changes and depends on bundles – always verify specific rates at the source.

The takeaway: the choice is not about "who is cheapest" but about matching the model. Bundles pay off with high, steady volume; pay-as-you-go with irregular volume. USD billing makes sense when you send to many countries – for traffic mostly to Poland it adds currency conversion and a higher rate.

SENDLY (that is us) – a service registered in the UKE telecoms register: messages go straight from the carrier, with no chain of middlemen. One REST API with a Bearer token, delivery webhooks, bulk sending to 100 numbers per request, custom sender ID, a WooCommerce plugin and an MCP server for AI agents. Billing is pay-as-you-go only: from PLN 0.075 per SMS, no subscription, no activation fee, no minimum top-up, VAT invoice in PLN. You start with 100 free SMS and a transparent price list. A deliberate limitation: we focus on SMS – you will not find RCS or WhatsApp here.

SMSAPI – the largest and best-known Polish SMS gateway, on the market for almost two decades. Strengths: a mature campaign panel, a large catalogue of ready integrations, a recognised brand. Model: pre-paid bundles – the unit rate depends on bundle size, which rewards high, predictable volume. For companies that mainly want a marketing panel and treat the API as an add-on, it is a natural candidate.

SerwerSMS – the second veteran of the Polish market. Campaign panel, integrations, API documentation, bundle and subscription models. Its customer profile is similar to SMSAPI: marketing teams running regular campaigns. When comparing bundles, price your own realistic volume – the lowest advertised rates usually apply to the highest tiers.

mProfi – a Polish mobile communication platform focused on SMS campaigns run from a panel, with offers agreed with a salesperson more often than through self-service pricing. Chosen mainly by marketing teams; for API-first developer scenarios it is usually not the first pick.

Twilio – the developer standard worldwide: excellent documentation, SDKs for everything, a huge ecosystem. The cost of that universality for sending to Poland: billing in USD (currency conversion, invoice from outside the EU), a higher per-SMS rate for Polish numbers than local players, and extra registration requirements for sender IDs. It makes sense when one codebase has to serve customers in many countries.

Vonage (formerly Nexmo) – a close counterpart of Twilio: global API, good SDKs, foreign-currency billing. The choice usually comes down to team preference and rates for your specific destinations.

Infobip – an enterprise-class platform with its own global infrastructure and full omnichannel (SMS, RCS, WhatsApp, e-mail, push). Pricing is individual, deployments often come with an account manager. A strong candidate for large multi-channel organisations; usually too heavy for a small company that just needs SMS over an API.

Bird (formerly MessageBird) – a global CPaaS that has been rebuilding its offer and pricing model towards an omnichannel platform in recent years. Like Infobip: strong in multi-channel and scale, less in simplicity of getting started with a single SMS use case.

Rather than one "best overall" ranking, it is more honest to name winners per scenario:

• Transactional notifications and 2FA codes in Poland – what matters is simple integration, a low flat price and fast delivery in Polish networks. The contest here is between SENDLY (carrier, pay-as-you-go, REST in minutes) and the local gateways; global aggregators lose on Polish rates and USD billing.
• Bulk marketing campaigns from a panel – if the marketing team clicks campaigns together, SMSAPI and SerwerSMS are the natural candidates (mature panels). If your system generates the bulk traffic via API, compare bundle costs with pay-as-you-go – see our bulk SMS guide and the bulk SMS page.
• Global scale, many countries – Twilio or Vonage; if you need omnichannel and enterprise support – Infobip or Bird.
• WooCommerce store – the shortest path is a ready plugin instead of custom code; SENDLY has a WooCommerce integration with sign-up straight from the plugin.
• Startup / developer with irregular volume – pay-as-you-go with no subscription, so a quiet month costs nothing: SENDLY in Poland, Twilio for a global audience.

An aggregator buys routes from carriers (sometimes from other aggregators) and resells them – your message passes through a chain of intermediaries, each adding margin and a point of failure. A carrier in the UKE register sends directly into Polish networks: a shorter path, full control over delivery quality and the sender ID.

That does not make aggregators a bad choice – global aggregators exist precisely so one integration can cover a hundred countries. But if you send mostly to Poland, ask every provider directly: which route does my SMS physically take, and how many parties earn on it along the way?

Every serious provider offers a trial – test credit or a pool of free messages. A sensible comparison plan: pick two or three candidates that match your model, send the same test messages via API to a few numbers in different networks (Orange, Play, Plus, T-Mobile), compare delivery times, DLR reports and integration convenience, then price your realistic volume – our pricing guide and calculator will help.

With SENDLY you start with 100 free SMS – no card, no contract, first API message within minutes of signing up.