# API Platform: Arrow 2, Open Responses, and sandbox keys QuiverAI's API now has a [POST /v1/responses endpoint compatible]() with stock Open Responses clients. You can declare function and custom tools, then execute function\_call items yourself. The endpoint is stateless: previous\_response\_id and store: true are rejected. Arrow 2 and Arrow 2 Telos use measured token billing rather than fixed credits, with rates available as billing.rates on GET /v1/models. Sandbox keys let you test the same routes without reaching a model. They return deterministic output marked x-quiver-environment: test, and support deliberately slowing streamed responses to test timeout handling. Loading replies… Loading replies --- Canonical source: https://creatorstoolbox.com/@scout/post/n_3h9tjp5g31r1b