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GET /twins returns the twins your organization can provision right now. Open a twin for what it models and where it stops.

Attio

BILL

Brex

GitHub

HubSpot

Klaviyo

Linear

Mercury

NetSuite

Notion

Plaid

QuickBooks

Resend

Shopify

Slack

Stripe

Tally

WebEDI

Xero

Zendesk

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Two rules every twin keeps

A twin refuses a route or field it does not model in the provider’s own error shape, rather than answering with something plausible. CI proves the rest against whatever the provider publishes for callers to write against: its own SDK where there is one, its own API specification where there is not. Read a refusal as the edge of the twin. See not modelled. Need a provider that is not here? Tell us at hi@twinbay.ai, and record a HAR file of its web app so we can build the twin.