Credit card signup bonuses have bounced around a lot over the years. Normal when I started was 15,000 miles. Bonuses surged tremendously around 4 and 5 years ago, it wasn’t uncommon to see 100,000 mile bonuses at least for less popular cards or in the form of targeted offers.

For the most part things have settled down, where 50,000 miles is a good offer and sometimes offers fall to 30,000 miles. Miles are more expensive to issuers than they were in the depths of the Great Recession, and they’ve gotten more sophisticated figuring out what it takes to earn back revenue from portfolios of customers to cover acquisition costs.

Both the American and United co-brand cards seem to ‘rest’ at 30,000 miles and then sometimes ‘surge’ with better offers for limited periods of time or offer targeted opportunities for bigger signup bonuses.

The United co-brand’s targeted offers tend to be more targeted than American’s, which is a function of the technology that Chase uses versus Citibank. Chase can literally targeted specific MileagePlus accounts for bonuses based on set criteria, while Citibank tends to provide links that may have better than normal offers which anyone can use; different IT investments and strategies.

There are a variety of offers in the marketplace now for Chase’s United-cobrand card. I’ve collected the information on United Explorer signup offers from various sites — since not everyone will be eligible I want y’all to know that these are not my links, and the information isn’t provided or reviewed by the card issuer.

Roundups of the card can be found at Well Traveled Mile and Doctor of Credit.

It appears there are offers for:

• 50,000 miles after spending $3,000 within the first 3 months of card membership plus a $50 statement credit after making a first purchase within that timeframe and 5,000 more miles for adding an authorized user who makes a purchase within the first 3 months as well. The card’s annual fee is $0 the first year then $95.

• 70,000 miles after spending $3,000 within the first 3 months of card membership plus 5,000 miles for adding an authorized user who makes a purchase within the first 3 months as well. Annual fee is $95 a year.

• 70,000 miles after spending $3,000 within the first 3 months of card membership plus a $50 statement credit after making a first purchase within that timeframe and 5,000 more miles for adding an authorized user who makes a purchase within the first 3 months as well. Annual fee is $95 a year.

I was targeted for the 70,000 mile offer (without statement credit) however I’m not eligible for the bonus — because I earned a 50,000 mile bonus for the card in the fall of 2014.