Technology
The technology we work with
At Proxera we use third-party services that we contract and pay for: ElevenLabs and Twilio in the voice assistant, OpenAI in the website chat and on WhatsApp, Claude (Anthropic) in XERA, and Hetzner servers in Finland. Here we explain what each one actually does, product by product.
Proxera is an artificial intelligence company from Barcelona that develops and deploys operational AI agents for service SMEs (accounting and tax advisory firms, law firms, real estate agencies, academies, agencies and aesthetics centres), connected to the tools they already use.
What each provider does in each product
| Product | Provider | What it does | What it does not do |
|---|---|---|---|
| Voice assistant (phone) | ElevenLabs | Recognises what the caller says, runs the conversation and provides the voice, with its Eleven v4 Turbo model. The language model that decides what to answer is Qwen3.5, from Alibaba, which we chose inside the ElevenLabs platform. | For voice we use neither OpenAI nor Claude. |
| Voice assistant phone numbers | Twilio | Calls come in through Twilio numbers. The demonstration one, +34 930 34 78 22, is a Barcelona number. | It does not decide what is answered. |
| Xera Chat: website chat and WhatsApp | OpenAI | Writes the chat assistant's replies, with the GPT-5 mini model. WhatsApp goes through Meta's official WhatsApp Business API. | It does not answer the phone. |
| XERA, the platform | Claude (Anthropic) | Each client uses Claude with their own subscription, taken out in their name: it does not go through Proxera and we add no margin. | Claude does not answer your clients on the phone or in the chat. |
| IA lista para tu negocio (ES) (ready-made AI for your business) | Claude or ChatGPT, as the client chooses | We set up the client's own AI account, which they take out and pay for in their name. | It does not go through our accounts. |
| Servers | Hetzner | The website, the panel, the chat and the voice assistant service run on Hetzner servers in Finland. | — |
Checked in our configuration on 18 October 2026.
What we build ourselves
What joins those pieces together is built by us: each assistant's instructions, the message you receive when the call ends, the alerts, the panel and the call filter. We also work with Claude internally to prepare, review and program.
They are not partners or sponsors
None of these providers is a partner or sponsor of Proxera, nor has any of them reviewed this page: they are services we pay for. That is why we name them in text and without their logos. The AI models of these providers may handle data outside the European Economic Area; the full list of providers that process data, and their safeguards, is in our privacy policy (ES).
The call is in Spanish. Appointments are booked in Spanish.
How we changed voice model, with the measurement: We moved our voice assistant to Eleven v4 Turbo.