The two ways shippers could purchase trucking capacity were through contracts or the spot market.
Until now.
FreightWaves has introduced index-linked contracts as a third option for trucking capacity. Currently, 30 shippers — large consumer-brand companies — are in various stages of implementing this new product.
Index-based contracts are linked to FreightWaves TRAC rates
Index-linked contracts work in a similar manner to fuel surcharges. A shipper and a carrier agree to index freight costs...
https://www.freightwaves.com/news/index-linked-contracts-new-way-to-buy-trucking-capacity