Touchmark Sessions API
The pricing surface behind @touchmark/sdk - open a session per scope, emit events fire-and-forget with an idempotent event_id, and consume quality-adjusted valuations (absolute fair_price_usd per event) on a cursor-resumable stream. HTTP transport (long-poll in v1) over a protobuf/gRPC wire contract (proto/touchmark/v1/session.proto); Bearer api_key auth. Private beta - no public OpenAPI is published.