Freedom251 › Transactional SMS Software
GatewayAPI
What GatewayAPI is
GatewayAPI is a paid messaging platform for sending SMS, RCS, and email through web tools and APIs. SMS capabilities include virtual numbers, shortcodes, keywords, number lookup, two-way messaging, inbound webhooks, and MMS. RCS Business Messaging supports interactive branded messages with rich media. Transactional messaging can deliver alerts, one-time passwords, and order updates. The Message API is recommended for new SMS and RCS projects, while selected high-volume customers can use direct SMPP connections. Creating and maintaining an account is free, but SMS traffic is billed separately. Pay-as-you-go SMS has no monthly subscription by default, with country-specific rates and possible short-code requirements. RCS Basic is listed at €0.04, paid once per RCS message per operator in the selected country, with the shown price for HI3G. Integrations include WordPress, Zapier, Make, Shopify, WooCommerce, Salesforce, Slack, and Zendesk. EU hosting, Secret messaging, rate limits, IP and URL allowlists, and annual GDPR-related auditor statements are documented.
Who it suits
GatewayAPI suits businesses sending transactional or conversational messages through APIs, web tools, or listed integrations. It also fits teams needing RCS, two-way SMS, webhooks, or EU data handling.
What it does well
- Free account creation and maintenance
- Supports SMS, RCS, and email
- Two-way SMS, MMS, and shortcodes
- Includes WordPress, Shopify, and Salesforce integrations
- EU data residency setup available
What to know first
- SMS traffic is billed separately
- RCS pricing varies by operator and country
- SMPP access limited to selected customers
- No monthly subscription by default for pay-as-you-go SMS
Limits
The account itself is free, but SMS traffic is billed separately. Pay-as-you-go SMS uses country-specific rates, and some destinations require a short code; RCS Basic pricing varies by operator and country.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| RCS Basic | Per RCS message, per operator in the selected country. · Price shown for HI3G · Pricing varies by operator and country | €0.04, paid once |
| Pay-as-you-go SMS | Pay only for SMS traffic sent; country-specific rates apply. · No monthly subscription by default · Some countries require a short code · High-volume discounts by quote | On request |
As gatewayapi.com lists them, read 9 Oct 2026. The maker's own page has the final word.
Getting started
- Open the GatewayAPI website
- Create a free GatewayAPI account
- Use the Message API for SMS or RCS phone messaging
- Connect an integration such as Shopify, Zapier or Salesforce
- Configure webhooks, sender options and security controls
- Send traffic under the applicable country and operator rates
Verdict
GatewayAPI offers a broad messaging mix with developer APIs, integrations, and account security controls. Costs depend on traffic and country, so teams should check applicable rates and channel requirements.
Questions
Does GatewayAPI have a free plan?
Creating and maintaining an account is free. SMS traffic is billed separately.
What platforms does GatewayAPI support?
It is available through API and web interfaces, with Node.js listed for SDK development.
What does RCS Basic cost?
RCS Basic is listed at €0.04, paid once, billed per RCS message and operator in the selected country. The displayed price is for HI3G.
Can GatewayAPI send two-way messages?
Yes. Two-way SMS, inbound webhooks and MMS are supported.
Which integrations are listed?
Integrations include WordPress, Zapier, Make, Shopify, WooCommerce, Salesforce, Slack and Zendesk.
Who operates GatewayAPI?
GatewayAPI is owned and operated by ONLINECITY.IO.
Facts from GatewayAPI's own pages
- Account controls
- Security add-ons include country and rate limits, IP whitelisting, and URL whitelisting. · gatewayapi.com, 9 Oct 2026
- Company
- GatewayAPI is owned and operated by ONLINECITY.IO, which the company says has operated since 1999. · gatewayapi.com, 9 Oct 2026
- Confidential messaging
- The Secret feature excludes message content, sender, and recipient from the traffic log and system storage. · gatewayapi.com, 9 Oct 2026
- Developer access
- The documentation recommends its Message API for new customers sending SMS and RCS messages to phone numbers. · gatewayapi.com, 9 Oct 2026
- EU data residency
- Its EU setup keeps data storage with a cloud provider operating physically in the EU and owned by an EU company, with connections handled through EU telecommunications companies and A2P providers by default. · gatewayapi.com, 9 Oct 2026
- Free account
- Creating and maintaining a GatewayAPI account does not cost anything, while SMS traffic is billed separately. · gatewayapi.com, 9 Oct 2026
- Free plan
- No · gatewayapi.com, 24 Sept 2026
- Integrations
- Listed integrations include WordPress, Zapier, Make, Shopify, WooCommerce, Salesforce, Slack, and Zendesk. · gatewayapi.com, 9 Oct 2026
- Messaging features
- Its SMS services include virtual numbers, shortcodes, keywords, number lookup, and two-way messaging. · gatewayapi.com, 9 Oct 2026
- Product
- GatewayAPI provides a messaging platform for SMS, RCS, and email, with APIs for sending messages globally. · gatewayapi.com, 9 Oct 2026
- RCS
- RCS Business Messaging supports interactive branded messages with rich media. · gatewayapi.com, 9 Oct 2026
- Security audits
- GatewayAPI says it receives annual ISAE 3000 and ISAE 3402 auditor statements concerning GDPR compliance. · gatewayapi.com, 9 Oct 2026
- SMPP access
- A direct SMPP connection for high-volume SMS is available to selected customers. · gatewayapi.com, 9 Oct 2026
- Support
- GatewayAPI says its average support response time is under 20 seconds during working hours and that support has no minimum spending requirement. · gatewayapi.com, 9 Oct 2026
- Transactional use
- GatewayAPI describes transactional messaging for automated alerts, one-time passwords, and order updates. · gatewayapi.com, 9 Oct 2026
Where GatewayAPI stands on Freedom251
- Transactional SMS Software#7 of 76