Otc trades.
you mean O.T.C. trades? as in Over the Counter?
then the answer is no there isn't any OTC price charts or brokers or any kind of stats because it is "over the counter".
here you can read more details about it in general:
https://www.investopedia.com/terms/o/otc.aspin our case OTC trades are usually referred to trades that occur anywhere but exchanges, which then usually translates into p2p exchange which leaves no trace so there is no "charts" to see.