Integrating Free APIs with Clay AI for Optimal Results

Does anyone have any success integrating free APIs and using Clay AI to sift through multiple results? I'm using ProPublica for basic NPO info but sometimes return dozens of results and need Clay to use context to pick the best one. What I also need though is for Clay to say "none of these are good fits" if it doesn't have a high confidence, but so far every time I change the threshhold it just scores the top choice higher.