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Free tierNo credit card7 U.S. grids
1
See the evidence
Current live scorecards and historical archive
ERCOT · illustrative API previewNot a scorecard
ERCOT winter cold-snap demand
Forecast vs. actual · day-ahead
Illustrative
see live scorecard
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2
Create your account
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100
requests/hour on free tier
7
U.S. grids covered
<50ms
API response time
3
Try the API
One endpoint, one key, JSON response, paste the key from Step 2
Request
# Get day-ahead ERCOT forecast
curl "https://api.gramm.ai/v1/demand/forecast?region=ERCOT&horizon=1d" \
-H "Authorization: Bearer grmm_your_key"Response200 OK · 47ms
{
"status": "success",
"data": [
{ "timestamp": "2026-05-03T00:00:00Z", "value_mw": 52341.8 },
{ "timestamp": "2026-05-03T01:00:00Z", "value_mw": 50127.6 }
],
"meta": {
"region": "ERCOT",
"horizon": "1d",
"resolution": "1h",
"count": 24
}
}