MID pools
Group MIDs and choose round-robin, weighted, or custom selection.
Updated August 11, 2026On this page
- At least one MID
- Dry Run is sufficient for a test pool
A MID pool groups gateway connections and owns the selection configuration. A router assigns transaction categories to pools; it does not store individual MID weights.
Launch supports round robin. Weighted selection is available on Growth and Enterprise. Server-side entitlement checks apply even when an older browser still displays a stale option.
Create a MID pool
Add the pool
Open MID Pools, choose Add MID pool, and enter an operational name. Select Round robin, Weighted, or Custom mode.
Add MIDs and configure selection
Open the pool and add one or more MIDs. In Weighted mode, set relative weights within this pool. Round robin rotates across eligible MIDs. Custom mode uses the configured custom ordering behavior.
Check readiness
A pool is Ready when it is enabled and at least one configured MID is enabled, healthy, and has valid credentials. Pausing the pool makes every router assignment to it unavailable.
Selection modes
| Mode | Selection behavior | Typical use |
|---|---|---|
| Round robin | Rotates evenly through eligible MIDs | Similar-capacity gateways |
| Weighted | Uses relative weights stored in the pool | Unequal capacity or volume allocation |
| Custom | Uses the pool's custom ordering rule | Merchant-specific routing policy |