Payment-gated (x402) API for real-time and historical US wholesale electricity prices.

Live now: real-time and historical ERCOT wholesale electricity prices, metered per call with x402 (USDC micropayments) — no API keys, no subscriptions. Currently settling on Base Sepolia testnet while mainnet payment flows are verified. See llms.txt for endpoints and pricing, or api.grid402.com/health for current status.