Gas Price Implied Index
Market-implied AAA U.S. national average price of regular unleaded gasoline on the monthly reference date, in dollars per gallon.
This index uses methodology-defined points, not a win probability. The 50–150 probability reading does not apply. See the methodology overview for how the level is built. The Governance catalog holds the formal methodology and factsheet.
Key facts
- Ticker
- GASI
- Index id
- gasi
- Methodology
- implied_level
- Latest published level
- 3.77 (as of 2026-11-05T00:49:00Z)
- Scale
- Methodology-defined points
- Calculating agent
- Adjacent
- Data access
- Public JSON API, no authentication, 15-minute delay
- API endpoint
- https://api.adjacent.markets/api/v1/public/indices/gasi
Index data last published: 2026-11-05.
Live data: public JSON API (15-minute delayed, no auth).
Frequently asked questions
- What is the Gas Price Implied Index (GASI)? Market-implied AAA U.S. national average price of regular unleaded gasoline on the monthly reference date, in dollars per gallon. GASI is a rules-based index built from prediction-market event contracts and calculated by Adjacent, an independent index provider.
- How is GASI calculated? Each Adjacent index follows a published methodology that defines its eligible universe, constituent selection, and weighting. Values are recomputed on the indexer’s scheduled compute cycle. Adjacent’s public data is served from a snapshot tier delayed by 15 minutes.
- How do I access GASI data? GASI is available from the public JSON API at /api/v1/public/indices/gasi with no authentication required. Plans with higher rate limits, the MCP server, and embeddable widgets cover the same data.