Kensho Scribe Real Time API
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.
Kensho Scribe Real Time API is one of 9 APIs that S&P Global publishes on the 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.
This event API exposes 2 operations across 1 channel, and defines 21 schemas. It is described by AsyncAPI 2.6.0, at version 2.0.0.
The API connects through a single server, scribe.kensho.com/ws (wss).
Metadata
The identity and technical contract details declared by the specification.
Channels & Operations 2
Across 1 channel, the API surfaces 2 operations. Each is listed below with its action, channel, parameters, and response codes.
Messages & Schemas 21
The contract defines 21 schemas that model the data carried by its messages. The most detailed are AudioFormat (4 properties), AddDataPayload (3 properties), EndOfStreamPayload (2 properties), AddTranscriptPayload (2 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable AsyncAPI contract behind this narrative.
Source
More from S&P Global 8
Other APIs S&P Global publishes across the network.