What is palanca? What is a palanca letter? A palanca letter is one that is sent to the candidates and team, informing them of the prayers and sacrifices that you are offering to God on their behalf. A letter may be sent explaining what type of palanca is being offered, but the letter is NOT the palanca. The actual palanca is the action – intercessory prayer, sacrifice, or works of mercy, and it can be done without writing a letter.