# FX

### **External Coverage**

For FX, the relayer sources executable quotes from institutional liquidity providers for market open sessions. Trading continues during most US holidays.

| Instrument | Week Start (ET) | Week End (ET)  |
| ---------- | --------------- | -------------- |
| EUR / USD  | Sunday 5:00 PM  | Friday 5:00 PM |
| USD / JPY  | Sunday 5:00 PM  | Friday 5:00 PM |

### **Internal Coverage**

Internal pricing is used from Friday 5:00 PM to Sunday 5:00 PM ET, or at any time there is a gap of more than 30 seconds between external oracle datapoints. This ensures continuous pricing coverage across all sessions, including after-hours. You can read more about the internal pricing mechanism [here](/perp-mechanics/oracle-price.md#internal-pricing).

### **Data Source**

See the [Specification Index](/consolidated-resources/specification-index.md) page for pricing referencing sources.


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