What is transaction fee on my credit card?

Could you please elaborate on what you mean by "transaction fee on my credit card"? Are you referring to the fee charged by your credit card issuer for each purchase you make, or is there a specific transaction you're inquiring about? Typically, credit card issuers charge a small percentage of the purchase amount as a transaction fee, but this can vary depending on the card and the issuer. Additionally, some merchants may also charge a fee for using a credit card, which is separate from the fee charged by the card issuer. It would be helpful to know more about your specific situation in order to provide a more accurate answer.