About the USD to PHP rate
Remittances from overseas Filipino workers are a significant part of the Philippine economy, and a large share flow in from the United States, which makes USD/PHP one of the most practically searched rates in Southeast Asia.
The Philippine peso has historically been relatively stable compared to some regional currencies, but it still responds to US monetary policy, oil prices (the Philippines is a net energy importer), and domestic inflation data.
If you're sending money home, the difference between this mid-market rate and a transfer provider's quoted rate is the real cost of the transfer — most of the well-known apps serving this corridor are competitive, so it's worth comparing two or three before sending a large amount.