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Seems our IP was blocked, I switched to a different one and it's working now.
A few days ago someone was trying to add hundreds of thousands PSN IDs to the site and it got our IP blocked from PSN's CDN (Akamai), which Steam also seems to use so that's why it was blocked I'm guessing. Very annoying and I have no idea what they were trying to do but I've stepped up our protection against such attacks.