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RCS-Box
Cologne, Germany
What it is
RCS-Box is a multi-tenant API for Google RCS Business Messaging, with EU hosting and a German contract partner. It supports text with suggestions, rich cards, carousels, XL messages, and automatic video and image unfurling. Webhooks can carry incoming messages and opt-in or opt-out events. Forwarded webhooks include an HMAC-SHA256 signature calculated with the tenant API key. Each tenant has a dedicated API key and brand-level isolation, plus a configurable country allowlist that defaults to Germany’s +49 prefix. The API handles STOP and START blacklist status per agent. Plans can use standard mode or newsletter mode, where billing is based on active recipients per month. XL messages are available on all plans from Skizze and count as one conversation. The Free plan is free for 100 sessions per calendar month. Paid options are Skizze at €49 a month, Atelier at €249 a month, and Manufaktur at €999 a month. RCS-Box is presented for development teams and technology leaders in startups, scale-ups, and enterprise technology units.
For and against
For
- Supports rich cards, carousels, and XL messages
- Webhooks cover messages and opt-in events
- Dedicated API keys isolate tenants
- Automatically handles STOP and START status
Against
- Free plan allows 100 sessions per calendar month
- XL messages start with the Skizze plan
- Newsletter billing is based on active monthly recipients
The verdict
RCS-Box provides a range of RCS formats and tenant-level controls for teams integrating messaging through an API. Check the session allowance and plan costs against the intended usage.
Who it suits
RCS-Box is intended for development teams, CTOs, and tech leads building RCS messaging for startups, scale-ups, or enterprise technology units. Its tenant isolation and webhook features may suit teams managing distinct brands and message events.
Plans and prices
Free
Free tier · API access
Read 15 Oct 2026 · railslove.com
Skizze
XL Messages · Standard or Newsletter mode
Read 15 Oct 2026 · railslove.com
Atelier
XL Messages · Standard or Newsletter mode
Read 15 Oct 2026 · railslove.com
Manufaktur
XL Messages · Standard or Newsletter mode
Read 15 Oct 2026 · railslove.com
On the record
- Agent lifecycle
- Agents can be created, updated, verified, launched and monitored through documented endpoints.api.box.rcs.jetzt · read 15 Oct 2026
- Asset limits
- Uploaded logo and hero assets accept PNG or JPEG files up to 5 MB, with a maximum of 50 assets per tenant.api.box.rcs.jetzt · read 15 Oct 2026
- Audience
- The API is presented for development teams, CTOs, and tech leads in startups, scale-ups, and enterprise technology units.railslove.com · read 30 Sep 2026
- Authentication
- Authenticated API calls use a tenant-specific 64-character hexadecimal key through Bearer or X-API-Key headers.api.box.rcs.jetzt · read 15 Oct 2026
- Brand isolation
- Each tenant receives brand-level isolation and a dedicated API key.api.box.rcs.jetzt · read 15 Oct 2026
- Capability checks
- The API checks RCS reachability and reported device features for individual numbers or batches of up to 100.api.box.rcs.jetzt · read 15 Oct 2026
- Carousel limit
- A carousel can contain up to ten cards.railslove.com · read 15 Oct 2026
- Company founded
- LinkedIn lists Railslove as founded in 2008.de.linkedin.com · read 15 Oct 2026
- Company founders
- Crunchbase names Jan Kus, Michael Bumann and Tim Schneider as Railslove founders.crunchbase.com · read 15 Oct 2026
- Company funding
- Crunchbase displays placeholder or obfuscated funding-event entries and no usable funding total.crunchbase.com · read 15 Oct 2026
- Company headquarters
- LinkedIn lists Railslove's headquarters in Cologne, North Rhine-Westphalia, Germany.de.linkedin.com · read 15 Oct 2026
- Company legal name
- The legal operator identified in the imprint is Railslove GmbH.railslove.com · read 15 Oct 2026
- Company ownership
- Crunchbase describes Railslove GmbH as a private, for-profit software development company.crunchbase.com · read 15 Oct 2026
- Company size
- LinkedIn lists Railslove in the 11–50 employee range.de.linkedin.com · read 15 Oct 2026
- Country allowlist
- Each tenant has a configurable country allowlist, defaulting to Germany with the +49 prefix.api.box.rcs.jetzt · read 30 Sep 2026
- Country restriction
- Each tenant has a configurable country allow-list that defaults to the +49 prefix.api.box.rcs.jetzt · read 15 Oct 2026
- Documentation
- The public documentation provides OpenAPI/Swagger navigation, endpoint examples, schemas, errors, webhooks and changelog information.api.box.rcs.jetzt · read 15 Oct 2026
- Hosting
- Railslove describes RCS-Box as EU-hosted with a German contract partner.railslove.com · read 15 Oct 2026
