DubbleBlack

DubbleBlack Powder provides aggregated first-party behavioral and verified transaction evidence for product recommendations. Given a vertical, category, and purchase intent, the API returns ranked products with evidence scores, confidence bands, and provenance metadata, so recommendations are grounded in real consumer behavior rather than catalog data alone. When observations are too sparse to support a confident recommendation, the API returns an explicit insufficient evidence signal instead of fabricated results. This server is a pay-per-use, transparent proxy in front of DubbleBlack's own API: it handles identity, payment, and proxying. Agents can purchase autonomously or with their human's approval. This document is the source of truth for agents: it lists the complete verified paid surface with each operation's live price in its x-payment-info. Endpoints not listed here are not part of the supported catalog. The live catalog at /manifest.json is authoritative for prices and any free included units (prices[].includedUnits) - some meters include free usage per account before any charge, reserved for agents claimed by a human with a verified email.