# Kensho Scribe Real Time API

**Canonical:** https://apis.io/apis/sp-global/kensho-scribe-realtime-api/  
**Provider:** S&P Global — https://apis.io/providers/sp-global/  
**Base URL:** wss://scribe.kensho.com/ws  
**Documentation:** https://docs.kensho.com/scribe/v2/developer-guide

Kensho Scribe Real Time API is one of 9 APIs that [S&P Global](https://apis.io/providers/sp-global/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include Speech-to-Text, Transcription, WebSocket, Streaming, and Real-Time. The published artifact set on APIs.io includes an AsyncAPI specification, API documentation, an API reference, authentication docs, and a JSON-LD context.

Real-time streaming transcription over a WebSocket at wss://scribe.kensho.com/ws. Clients send an Authenticate message with a Kensho OIDC access token, then StartTranscription with an audio_format (RAW pcm_s16le, 16 kHz, mono), followed by base64-encoded AddData chunks of at most 15 seconds each carrying monotonically increasing sequence_numbers, and finally EndOfStream. The server streams TranscriptionStarted, DataAdded, AddTranscript, EndOfTranscript, and Error messages back over the same socket. This is the only public WebSocket surface S&P Global exposes — Capital IQ Pro, Marketplace, and other market-data feeds are delivered via REST, file/SFTP, Snowflake share, and Databricks share.

## Machine-readable artifacts (5)

- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/sp-global/refs/heads/main/asyncapi/kensho-scribe-realtime-asyncapi.yml
- **Documentation** — https://docs.kensho.com/scribe/v2/developer-guide
- **APIReference** — https://docs.kensho.com/scribe/v2/real-time-api-specification
- **Authentication** — https://docs.kensho.com/authentication
- **JSONLD** — https://raw.githubusercontent.com/api-evangelist/sp-global/refs/heads/main/json-ld/sp-global-context.jsonld

## Other S&P Global APIs (8)

- [S&P Global LLM-Ready API (kFinance)](https://apis.io/apis/sp-global/kensho-llm-ready-api/)
- [Kensho Extract API](https://apis.io/apis/sp-global/kensho-extract-api/)
- [Kensho NERD API](https://apis.io/apis/sp-global/kensho-nerd-api/)
- [Kensho Scribe Batch API v2](https://apis.io/apis/sp-global/kensho-scribe-batch-v2-api/)
- [Kensho Scribe Batch API v1](https://apis.io/apis/sp-global/kensho-scribe-batch-v1-api/)
- [Kensho Grounding Agent (Alpha)](https://apis.io/apis/sp-global/kensho-grounding-agent/)
- [S&P Capital IQ Pro](https://apis.io/apis/sp-global/sp-capital-iq-pro/)
- [S&P Global Marketplace](https://apis.io/apis/sp-global/sp-marketplace/)

## Tags

Speech-to-Text, Transcription, WebSocket, Streaming, Real-Time, AsyncAPI

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/sp-global/kensho-scribe-realtime-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/sp-global/.