> ## Documentation Index
> Fetch the complete documentation index at: https://docs.particle.pro/llms.txt
> Use this file to discover all available pages before exploring further.

# Particle API

> Inside every podcast: transcripts, speakers, entities, sponsors, and a knowledge graph that connects people and companies across episodes.

Particle API gives you what's inside the audio. Every episode is transcribed and diarized, broken into structural segments, distilled into engagement-scored clips, and linked to a knowledge graph of people, organizations, and companies. The same identifiers connect a guest on one podcast to a company's full profile, its product hierarchy, and the sponsors funding the shows where it's discussed.

Use it to track what people are saying, find the most quotable moments on any subject, follow how companies show up across audio, or build research tools that read audio the way they read text.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Make your first call and trace one entity across podcasts, dialogue, and companies in five minutes.
  </Card>

  <Card title="Podcasts" icon="microphone" href="/podcasts/overview">
    Episodes, transcripts, segments, clips, and the bias analysis behind every show.
  </Card>

  <Card title="Companies" icon="building" href="/companies/overview">
    Cross-referenced identifiers (CIK, ticker, domain, QID, entity slug) and full product hierarchies.
  </Card>

  <Card title="Knowledge graph" icon="users" href="/knowledge-graph/entities">
    People, organizations, and places — the connective tissue between audio and structured data.
  </Card>

  <Card title="Podcast advertising" icon="bullhorn" href="/podcasts/advertising">
    Sponsor breakdowns, leaderboards, co-occurrence, and per-company ad presence.
  </Card>

  <Card title="API reference" icon="terminal" href="/api-reference/introduction">
    Every endpoint, request, and response schema.
  </Card>
</CardGroup>