Steps

For programmatic equipment pricing/cost data (resale values, rental rates, ownership costs), use EquipmentWatch's API (equipmentwatch.com/api/), which offers Free (evaluation/prototyping/low-volume), Professional (production), and Enterprise (custom-negotiated) tiers.
Recognize EquipmentWatch's specs/costs/market-data APIs are commercial products built on their internal database of resale and auction market activity, not a free public dataset — budget for at least Professional-tier access for production use.
For actual live auction results (Ritchie Bros / IronPlanet), no public, documented API for pricing data was found — IronPlanet's marketplace has merged with EquipmentOne, and public access is via their consumer-facing auction site, not a developer API.
If historical auction pricing is needed and no vendor API is accessible, plan for either an EquipmentWatch subscription or an authorized data-sharing arrangement with Ritchie Bros — do not scrape auction results, which likely violates site terms of service.

Known gotchas

This is a mixed result: EquipmentWatch has a real, documented, tiered API (including a free evaluation tier); Ritchie Bros/IronPlanet does not appear to expose one publicly — don't conflate the two vendors' access models.
EquipmentWatch's free tier is explicitly positioned for evaluation/low-volume use, not production-scale integration — confirm quota limits before relying on it beyond a prototype.

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Source equipment auction pricing data (Ritchie Bros/IronPlanet, EquipmentWatch) for bid estimating

Steps

Known gotchas

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