The surface

Every market with a provider id has exactly one canonical surface:

/m/[marketId] — the tape on air, the price blocks (the SIGNAL controls), the arc, the event’s other markets.

https://denpa.ai/m/[marketId]        e.g. https://denpa.ai/m/559652

The surface composes, in one screen:

• market data — question, prices, volume, resolution state (server-rendered from the provider)
• bound streams — live HLS context attached by operators
• signal — the price blocks are the SIGNAL buttons; viewers act on the market without leaving
• crowd — MARKET vs CROWD vs YOU, bots excluded
• related markets — the rest of the event, volume-ranked
• on-air state — what the program clock is airing and what is up next
• receipts — who broadcast on it, when, to how many

Rules

• A surface MUST render a live state, an empty state and an error state.
• A surface MUST show a price only when one exists. Unknown is rendered as --, never as a placeholder value.
• Bindings MUST be HLS. Playback prefers hls.js before native HLS.
• Filing a signal without identity prompts sign-in; it never opens the provider in a new tab.

Interface

interface Surface {
  market():    MarketContext        // question · prices · volume · endDate · resolved
  streams():   Binding[]            // { handle, url (HLS), label, updatedAt }
  bind(url, label?)                 // identity required; handle resolved server-side
  unbind()                          // the caller's own binding only
  signals():   Signal[]             // canonical: one per operator per market
  signal(side, confidence?, take?)  // writes Signal + Snapshot atomically
  crowd():     { market, crowd, you }
  related():   MarketRef[]
  onAir():     Segment | null
  receipts():  Receipt[]
}

The home surface, denpa.ai, is a heatmap of top and resolving-24h markets plus pinned live operator tiles. Everything routes to market pages.