Pull BLS Producer Price Index series for asphalt paving inputs (finished paving mixtures and refinery-grade asphalt) to track material cost escalation.
domain: api.bls.gov · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Call the BLS Public API v2 at https://api.bls.gov/publicAPI/v2/timeseries/data/ with seriesid WPU1394 (Paving mixtures and blocks, asphalt) and/or WPU058102 (Asphalt, at refinery)
Register a free BLS API key to raise the daily query limit and enable multi-series/longer-range requests
Pass startyear/endyear parameters (registered keys support up to a 20-year span per request)
Parse the returned JSON Results.series[].data[] array for period/value pairs
Known gotchas
Unregistered API calls are capped at 25 queries/day and roughly 10 years of data per series — register a key for production use
WPU1394 and WPU058102 are not seasonally adjusted — compare year-over-year rather than month-over-month when using them in contract escalation clauses
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