What is a standard credit card limit?

Yes, as mentioned by Ka Yan, I think your credit limit is determined by your annual income in Singapore. You can find out more here https://www.mas.gov.sg/regulation/explainers/Is... but this is what I got:

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If you are below 55 years old, your credit limit is capped at:

• Two times your monthly income if you earn < $30,000
• Four times your monthly income if you earn between $30,000 - $120,000

If you are above 55 years old, your credit limit is capped at:

• $2,500 if you're earning up to $15,000
• Two times your monthly income if you're earning between $15,000 to $30,000
• Four times your monthly income if you're earning $30,000 to $120,000

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Based on my own experience, it's usually around 3-4 times of your monthly income