# APIs and references

> [!NOTE]
> **GA with allowlist** : ULL Solution is available only to approved exchange operators and their exchange participants.
> If you are an approved exchange participant, contact [exchanges@google.com](mailto:exchanges@google.com) to request access.

This page describes the APIs that are used with
Ultra Low Latency (ULL) Solution.

## API references

APIs that are used with ULL Solution include the following:

- For resources such as Virtual Private Cloud (VPC) networks,
  Cloud Next Generation Firewall policies, and Compute Engine
  instances, see the [Compute Engine API reference](https://docs.cloud.google.com/compute/docs/apis.md.txt).

- For Network Connectivity Center (NCC), see the
  [Network Connectivity API reference](https://docs.cloud.google.com/network-connectivity/docs/reference/networkconnectivity/rest.md.txt).

- For both ULL Multicast and Cloud Multicast, see
  the multicast-specific [Network Services API reference](https://docs.cloud.google.com/vpc/docs/multicast/reference/rest.md.txt).

- For ULL Packet Mirroring, see the ULL-specific


  [Network Security API reference](https://docs.cloud.google.com/ull-solution/participants/reference/packet-mirroring/rest.md.txt).