A managed SMS gateway provider without the lock-in.

Multi-vendor SMS routing, OTP API failover and a CPaaS platform on one operations layer. Keep your providers or use ours — Flowstates runs the binds, routes, vendor escalations, support and cost control.

What Flowstates operates for you

Flowstates is a managed messaging operations layer for SaaS platforms, CPaaS vendors, BPOs and enterprises. We run the SMS, RCS, WhatsApp, Viber, email and voice gateway, the OTP API, the routing logic and the vendor relationships — under a 99.99% gateway SLA, in the UK & Ireland, United States, Canada, Singapore, Australia & New Zealand and across LATAM.

Channels and APIs

  • SMS gateway with multi-vendor SMPP and HTTP routing, per-country and per-category rules, sender ID management and carrier-grade failover.
  • RCS Business Messaging, WhatsApp Business and Viber for Business with template management, BSP escalation and category-aware routing.
  • OTP API with sub-second routing, retries, fallback channels and per-route delivery observability for verification flows.
  • Messaging API for transactional, marketing and conversational traffic across every channel from a single endpoint.
  • Branded short links and link tracking for messaging campaigns and notifications.
  • Email and voice as fallback channels inside the same routing fabric.

Operating models

Bring your own vendor (BYOV) and keep your existing commercial relationships, or use Flowstates' vendor contracts. Bring your own gateway (BYOG) and have us operate the gateway you already run, or take the full Messaging as a Service stack — one API, every channel, fully outsourced.

What you get

  • 24/7 vendor escalation across SMS, RCS, WhatsApp and OTP — one operational layer that owns delivery problems end to end.
  • Per-route delivery data, OTP success metrics, latency monitoring and conversion-rate visibility per vendor and per country.
  • Cost optimisation through category-aware routing, ongoing vendor commercials review and BYOV portability.
  • Compliance with GDPR, UK GDPR, PIPEDA, PDPA and the Australian Privacy Act, with ICO-aligned operations in the UK.
  • Standalone Bridge workspace for relationship-led customer teams — WhatsApp, email, calls and CRM context in one inbox.

Use cases

OTP delivery resilience and one-time password failover. Multi-vendor SMS routing across countries and carriers. Vendor escalation and 24/7 messaging operations. WhatsApp Business operations including templates and BSP management. SMS and WhatsApp shift-fill workflows for healthcare staffing. Outbound campaigns for BPOs running messaging on behalf of B2C clients. Cost optimisation and category-aware routing for high-volume A2P traffic. Replacing or augmenting a CPaaS platform with a managed multi-vendor approach (CPaaS vs BYOV).

Frequently asked

Do I need to migrate my vendors? No. Flowstates supports bring-your-own-vendor, so your existing SMS, WhatsApp and OTP commercial agreements stay in place while we operate the gateway, routing and escalation layer.

What does the 99.99% gateway SLA cover? Availability of the Flowstates messaging gateway itself — the binds, routing engine, API and observability layer — independent of any single downstream vendor.

How is this different from a CPaaS? A CPaaS is typically a single-vendor platform you build against. Flowstates is the operations layer above your vendors: multi-vendor routing, vendor escalation, cost control and 24/7 operations, with no single-vendor lock-in.

Which regions are supported? United Kingdom & Ireland, United States (10DLC, toll-free, short code), Canada (CASL/PIPEDA-aware), Singapore (SSIR-registered, PDPA-compliant), Australia & New Zealand (sender-ID aware), and LATAM.