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Re:An open-source alternative to QuickBooks by citelao on Monday May 29, 2023 @09:09PM (#36120067)
I haven't used it, but the team (person?) that makes Buckets (https://www.budgetwithbuckets.com) makes SimpleFIN (https://www.simplefin.org), which seems like it exposes exactly what you want: simple transaction data from arbitrary banks.

Plaid offers transactions APIs (https://plaid.com/products/transactions/), but I guess to your point these APIs are geared towards fintech companies, not personal use.

EDIT: I don't know how well it works in general, though. You'd have to test it yourself.

Re:An open-source alternative to QuickBooks by xvilka on Monday May 29, 2023 @09:41PM (#36120267)
This SimpleFIN blog looks dead - last article is from 2016. Not exactly encouraging.
Re:An open-source alternative to QuickBooks by ajdude on Sunday June 04, 2023 @01:09PM (#36187319)
I'm currently writing a library that implements SimpleFIN. While the main website hasn't been updated in a while (even the demo endpoints are out of date, and I've written to the maintainer last month about it[1]), the demo endpoint described on the Simplefin Bridge the docs still works[2] so hopefully there's still movement.

[1] https://github.com/simplefin/simplefin.github.com/issues/14

[2] https://beta-bridge.simplefin.org/info/developers

Re:An open-source alternative to QuickBooks by cyberax on Monday May 29, 2023 @09:36PM (#36120239)
Plaid works great, but their API access is too pricey for an individual/small business.
Re:An open-source alternative to QuickBooks by dzelzs on Tuesday May 30, 2023 @04:26AM (#36122420)
Nordigen supports transactions as well (and for free), I personally use it with firefly for personal budgeting