Get session relative-volume history
GET
/api/v1/public/companies/:ticker/rvol-history3 credits / callAPI key required
Get a per-day relative-volume (RVOL) time series for a company, where each day's session volume is compared against the trailing 90-day average of the same trading session. Sessions are premarket (04:00-09:30 ET), regular (09:30-16:00 ET), afterhours (16:00-20:00 ET), and all (the full extended day). Returns 200 with an empty series when no history exists yet.
Parameters
Path
Company ticker symbol (1-5 letters, case-insensitive)
Query
Restrict to one session bucket; omit to return all four.
Series length in calendar days (1-365, default 180).
Code example
cURL
curl -X GET 'https://api.signal8.ai/api/v1/public/companies/AAPL/rvol-history' \
-H "X-Api-Key: $SIGNAL8_API_KEY"Request URL
GET
https://api.signal8.ai/api/v1/public/companies/AAPL/rvol-historyexample · 200
{
"data": {
"ticker": "AAPL",
"days": 180,
"sessions": [
"premarket",
"regular",
"afterhours",
"all"
],
"series": {
"regular": [
{
"date": "2026-06-12",
"sessionVolume": 30144079,
"baseline90d": 28710450,
"rvol": 1.05
},
{
"date": "2026-06-13",
"sessionVolume": 41882013,
"baseline90d": 28944120,
"rvol": 1.45
}
]
}
},
"meta": {
"backfillTriggered": false,
"empty": false
}
}