Ticker SPY
From 2015-08-19 09:31:00
Security Type Option
Market USA
Resolution Minute
Status Resolved

This applies to many strikes...here are three examples:

2015-08-19 09:31:00 : contractId: SPY150821P00181000; currentBidPrice: 57.0; lastBidPrice: 0.01; currentAskPrice: 0.01; lastAskPrice: 

0.012015-08-19 09:31:00 : contractId: SPY150821P00180000; currentBidPrice: 57.0; lastBidPrice: 0.01; currentAskPrice: 0.01; lastAskPrice: 

0.012015-08-19 09:31:00 : contractId: SPY150821P00179000; currentBidPrice: 57.0; lastBidPrice: 0.01; currentAskPrice: 0.01; lastAskPrice: 0.01