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The Natural dashboard in sandbox mode The sandbox is a complete Natural environment that functions like production. Point your integration at the sandbox base URL with a sandbox key:
Keys carry their environment in the prefix (sk_ntl_sandbox_..., ak_ntl_sandbox_...) and never work anywhere else. Sandbox keys come from the dashboard: open the account menu in the bottom-left corner (the same menu you sign out from) and flip the Sandbox toggle.

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How it behaves

  • No separate onboarding for your organization. Your verified Natural organization carries over automatically. Test customers become verified when you accept a pending invitation.
  • Money moves instantly. Transfers and payments settle as soon as you make them. Card payments are the exception: they wait until you simulate settlement.
  • Isolated. You can reach your own parties and your fixtures, nothing else. No other sandbox organization can see or touch your data.

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What you can do

Sandbox endpoints live under /simulations/* and appear in a Simulations group under each resource they test. The Connect, payment, payment-request, and bank-account actions above are also available from MCP, the SDKs, and the CLI; see Sandbox from MCP, CLI, and SDKs.