21 twins.
One base URL.
Pick a twin and point your existing client at the hostname the environment gives you. All product names, logos, and brands are property of their respective owners. Twinbay is not affiliated with or endorsed by them.
Attio
CRM·openapi
Objects, attributes and records, with lists, notes and tasks on top.
BILL
Accounting·openapi
Vendors, bills, the approval gate and the payments that clear them.
Brex
Spend management·openapi
Cards, budgets and spend limits, transactions, vendor payments, expenses and their receipts.
GitHub
Developer tools·octokit
Repositories, issues, pull requests and Projects v2, over REST and GraphQL.
HubSpot
CRM·hubspot-api-client
Contacts, companies and deals — with the search index one step behind the write.
Klaviyo
Marketing·klaviyo-api
Profiles, lists, events, derived segments, campaign sends and Customer Hub conversations, in Klaviyo's JSON:API with its two-bucket rate limits.
Linear
Issue tracking·@linear/sdk
Linear's GraphQL API and its web app: issues, projects, cycles, comments and the inbox, synced live.
Mercury
Banking·openapi
Accounts and balances, transactions, recipients, payments and approvals, events and webhooks, cards and invoices.
NetSuite
ERP·netsuite
Customers, accounts and items, with invoices, the payments that settle them, and SuiteQL.
Notion
Docs·notion-client
Databases, data sources, pages, blocks and comments, at version 2025-09-03.
Plaid
Banking·plaid-python
Linked bank logins with Plaid's own tokens, Item errors and signed webhooks, from Transactions Sync to Identity, Investments, Assets and Transfer.
QuickBooks
Accounting·python-quickbooks
Customers, items and accounts, with invoices and the payments that settle them.
Ramp
Spend management·openapi
Funds and cards, card transactions and receipts, reimbursements, vendors, bills and payments, approvals and accounting syncs.
Resend
Email·resend
Transactional sends, broadcasts, and the delivery events that follow them.
Shopify
Ecommerce·ShopifyAPI
The GraphQL Admin API with its calculated-cost bucket, its three error channels and an order stuck half-shipped.
Slack
Messaging·slack_sdk
Channels, messages, threads and reactions, with Slack's ok:false envelope and per-method rate limits.
Stripe
Payments·stripe
Payment intents, charges, refunds, disputes and payouts as state machines over a real clock, with Stripe's envelope, form encoding and idempotency.
Tally
Forms·openapi
Forms built from blocks, the questions Tally derives from them, and the submissions that come in.
WebEDI
EDI
The supplier portal's Documents workspace, with a PO acknowledgment ready to send.
Xero
Accounting·xero-python
Contacts, invoices and payments in a Xero organisation, tax and all.
Zendesk
Support·openapi
Tickets, comments, users and search, with Zendesk's named wrappers, integer ids and all three of its error envelopes.