Building audio generation from scratch requires an LLM for script writing, a TTS provider for voice synthesis, an audio pipeline for encoding, a storage system for the MP3 files, and a delivery system for webhooks and notifications. That's 6–12 months of engineering and significant ongoing infrastructure cost.
The ListenBrief API gives you all of this in a single endpoint. Send a POST request with your source list. Receive an MP3 URL via webhook when generation completes. Your users hear their briefing. You ship in days.
The global voice AI market is projected to reach $50 billion by 2027. Developers who build audio-first products today are building into a rapidly growing category. The API surface exists to make this accessible without infrastructure overhead.
// TypeScript SDK — generate a briefing in 10 lines
import { ListenBrief } from 'listenbrief';
const client = new ListenBrief({ apiKey: process.env.LB_API_KEY });
const briefing = await client.briefings.create({
profile_id: 'prof_xxx',
sources: [
{ type: 'rss', url: 'https://techcrunch.com/feed/' },
{ type: 'youtube', url: 'https://youtube.com/c/mkbhd' },
],
});
console.log(briefing.id, briefing.status); // ready in 2-5 minutes
What you can build
- Daily briefing products — build a consumer app or B2B tool where users get personalized audio briefings
- Audio summaries — generate audio summaries of any content your platform produces (reports, articles, dashboards)
- Internal intelligence tools — briefing automation for your team or organization
- White-label podcast generators — offer AI briefings as a feature to your own customers
- AI agent workflows — integrate with LLM agents via the MCP server or REST API
What the API returns
Every briefing object includes:
id— briefing ID for polling or webhook matchingstatus— pending | processing | complete | failedaudio_url— signed S3/R2 URL for the MP3, valid 24 hourstranscript— full text transcript of the briefingsummary— structured JSON summary with bullet points and key insightssources_used— list of sources that contributed to this briefingduration_seconds— audio length
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Example output — what the API generates
AI Investor Briefing — 3-minute example MP3
SDKs, docs, and a sandbox
Every API plan includes full access to:
- TypeScript SDK:
npm install listenbrief - Python SDK:
pip install listenbrief - OpenAPI 3.1 spec at listenbrief.com/developer/openapi.json
- Interactive docs at developer.listenbrief.com/api
- Sandbox mode with
test_API keys (no quota consumed) - Webhook signing for secure delivery notifications
75% of developers say audio APIs are underserved compared to text APIs. ListenBrief is built to fill this gap — a production-grade audio generation API with the same DX you expect from Stripe or Twilio.
See the full documentation at developer.listenbrief.com. Also see: MCP podcast server · AI briefing API overview