Four-layer gas pricing for every DCPI market: Henry Hub spot, regional basis at the nearest pricing hub, delivered industrial / electric-power $/MMBtu, and heat-rate-derived gas-to-grid $/MWh. The value-add nobody else publishes at this granularity.
Source: EIA v2 (Henry Hub) + eia_gas_prices (delivered industrial / electric) + DC Hub pricing-hub registry. PRO endpoint: GET /api/v1/markets/<slug>/gas-pricing. PRO heat-rate derivation: GET /api/v1/markets/<slug>/gas-to-grid.