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  "markdown": "Co-founder, Block.\n\nJack Dorsey co-founded Block, formerly Square, in 2009, and earlier co-founded Twitter. Block owns Square, Cash App, Afterpay, Bitkey and Tidal.\n\n## What Jack builds\n\n- [Square](https://www.anchorterminal.com/tools/square.md), graded B, 69.3/100, in Commerce \u0026 checkout. Square is Block's commerce and payments platform for sellers. Its REST API covers catalogue, orders, payment links, payments, inventory and customers, with seven SDKs and a beta MCP server hosted at mcp.squareup.com. Co-founder, Block, researched 2026-10-28.\n- [Square Appointments (Bookings API)](https://www.anchorterminal.com/tools/square-appointments.md), graded B, 68.1/100, in Restaurant \u0026 local bookings. Square Appointments is Block's booking product for service businesses. Its Bookings API searches a seller's availability and creates, updates and cancels appointments, with location, team member and business booking profiles and custom attributes. Co-founder, Block, researched 2026-10-28.\n\n## Works with\n\n- [Jim McKelvey](https://www.anchorterminal.com/people/jim-mckelvey-2/), Co-founder, Block\n- [Stephanie Grodin](https://www.anchorterminal.com/people/stephanie-grodin/), Head of Product - Core Product\n\n## Questions\n\n### Who is Jack Dorsey?\n\nJack Dorsey co-founded Block, formerly Square, in 2009, and earlier co-founded Twitter. Block owns Square, Cash App, Afterpay, Bitkey and Tidal.\n\n### What does Block, Inc. make?\n\nAnchor Terminal lists Square and Square Appointments (Bookings API) from Block, Inc.. Square is Block's commerce and payments platform for sellers. Its REST API covers catalogue, orders, payment links, payments, inventory and customers, with seven SDKs and a beta MCP server hosted at mcp.squareup.com.\n\n### How are Jack's tools graded?\n\nSquare is graded B, 69.3 out of 100; Square Appointments (Bookings API) is graded B, 68.1 out of 100, on Anchor Terminal's benchmark, which scores every listing against the same checklist.\n\n## Sources\n\n- https://www.linkedin.com/in/stephgrodin\n- https://squareup.com/gb/en\n- https://www.linkedin.com/company/joinsquare\n- https://squareup.com/gb/en/about\n- https://squareup.com/help/gb/en/contact?panel=BF53A9C8EF68\n- https://developer.squareup.com/gb/en\n- https://squareup.com/help/gb/en\n- https://en.wikipedia.org/wiki/Block,_Inc.\n- https://en.wikipedia.org/wiki/Jack_Dorsey\n- https://en.wikipedia.org/wiki/Jim_McKelvey\n- https://www.linkedin.com/in/stephgrodin/details/experience/\n- https://www.linkedin.com/in/stephgrodin/\n- https://www.linkedin.com/company/joinsquare/\n- https://squareup.com/us/en/appointments\n- https://developer.squareup.com/docs/bookings-api/what-it-does\n- https://squareup.com/help/us/en\n\nNot the same person as [Jack Dorsey](https://www.anchorterminal.com/people/jack-dorsey/) (Agentic AI Foundation (originally Block)), as far as the research can tell.\n\nThese are the people building the tools we list, named for their public role in the company or project behind a listing, from public pages, with the date it was researched. They don't work for Anchor Terminal (our own team is on the about page, /about/#author). We show public roles, public profiles and what the listing pages show, nothing private. To correct something, send an about or a photo, or have a page removed, write to privacy@anchorterminal.com.\n",
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