> For the complete documentation index, see [llms.txt](https://docs.nexusglobalpayments.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexusglobalpayments.org/fx-provision/rates-from-third-party-fx-providers/improving-rates-for-specific-psps.md).
# Improving rates for specific PSPs
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This page relates **only** to third-party FX Providers.
For Source PSPs that provide their own FX, a different process applies. See [Payment setup for PSPs who provide their own FX](/payment-processing/payment-setup-for-psps-who-provide-their-own-fx.md)for details.
{% endhint %}
## PSP-based improvements
FX Providers may also want to offer **improved rates to specific PSPs**. In Nexus this works as follows:
* An FXP may define the PSPs to which it wishes to offer improved rates
* For each PSP, the FXP may define how much the base rate must be improved, in basis points.
* This improvements applies to **all quotes issued to that PSP by the FXP**, for all currencies.
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It is not possible for an FXP to set different PSP-based improvements for different currencies.
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* When a Source PSP calls the `GET /quotes` API, Nexus will review the table of relationships between FXPs and PSPs, and extract any relevant preferential rates for that PSP.
* Nexus will then apply the relevant improvement to the FXP's base rate.
* An FXP may choose not to set any PSP-based improvements. If no PSP-based improvement is set for a specific PSP, the base rate will apply.
{% hint style="warning" %}
PSP-based improvements only need to be set once by the FXP, and will continue to apply for that FXP until the FXP updates or deletes the tiers.
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### TABLE: Example PSP-based improvements
FXP Id
PSP Id
IMPROVEMENT in basis points (applied to the base rate in the FXP’s quote)