WattMarkets

API

Everything on the site is available as an API, with one shape for every market. Try any endpoint right here on the playground key, no sign-up. A free personal key raises the limits to 120 requests a minute.

Paste one of these

Today's call
curl -H "X-Api-Key: wm_play_7d31c5e2a90f4b86e1" "https://wattmarkets.com/v1/predictions/daily?program=ercot-4cp-2026"
Live zone prices
curl -H "X-Api-Key: wm_play_7d31c5e2a90f4b86e1" "https://wattmarkets.com/v1/grid/lmp/zones?iso=ercot"
Feed status
curl -H "X-Api-Key: wm_play_7d31c5e2a90f4b86e1" "https://wattmarkets.com/v1/status"

Try it

playground key · 10/min
GET /v1/predictions/daily
curl -H "X-Api-Key: wm_play_7d31c5e2a90f4b86e1" \
  "https://wattmarkets.com/v1/predictions/daily"

The snippet carries the playground key. Sign in and it carries yours, with 1,000 requests a day.

SwaggerReferenceOpenAPI 3.1

Endpoints

GET /v1/predictions/daily?program&dateThe day's call: probability, level, drivers
GET /v1/predictions/intervals?program&datePer-interval probabilities and drivers
GET /v1/programsEvery program we run, with status