Offer to purchase in Caddo 12 9N 11W

First time poster here, so please pardon if this is a repeat question / topic. I own a veeeeery small factional interest in Caddo 8 9N 11W and have received what seems a low royalty lease offer (12.5%) for an atypically long 5 years. Would appreciate any feedback about other offers in the area so I can tell how this compares.