API & Infrastructure

Custom-built voice infrastructure that grows with you

No third-party dependencies or hidden markups. Fluents runs on a purpose-built, multi-region voice stack with sub-200ms audio pipelines, so your API calls translate to live experience instantly.

API-first, infrastructure-deep

We believe the best infrastructure fades into the background. That’s why we built for reliability first: multi-region failover, evented architecture, and latency-optimized audio so your experiences feel instantaneous.

Programmable Calls

  • Call Control: Create, answer, bridge, transfer, record, and hangup via API; warm handoffs in a single request.
  • Mid-call logic: Run serverless functions, fetch from external APIs, or branch flows on live variables.
  • Events everywhere: Webhooks for ringing, answered, transcription, sentiment, and custom checkpoints.
  • Data sync: Push transcripts, summaries, and outcomes to CRM or your warehouse in real time.

Security & Compliance

  • Encryption: In transit and at rest, secret rotation, signed webhooks.
  • Privacy tooling: Redaction for PII/PHI, selective recording, region pinning, consent prompts.
  • Governance: RBAC, API keys per environment, audit trails, request logs, and quotas.

Performance at Scale

  • 99.9% uptime targets: Across services; US-based performance and governance options.
  • Sub-200ms latency: Audio round-trip is fast; answer-machine & voicemail detection included.
  • Concurrency management: End-to-end capacity handling so launches don’t buckle under load.

Built for Developers

  • Documentation & SDKs: OpenAPI spec, Postman collection, and SDKs (Node, Python).
  • Testing environments: Sandbox mode, feature flags, and deterministic mocked telephony.
  • Observability: Stream events to Datadog, New Relic, OpenTelemetry, or export to your warehouse.

"From cold-start pilots to enterprise migrations, teams choose the Fluents API to ship faster with fewer moving parts. The outcome is the same: lower complexity, higher reliability, and total control over the voice layer."

Max Perez
Digital Heartbeat, CEO

Frequently Asked Questions

Answers to the most common questions about building on the Fluents API — from mid-call logic to security and scale.

Let’s Make Every Call Work for You

We built Fluents to make phones effortless again. Seamless integrations, transparent pricing, and support from real people who care.