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Modern Treasury Journal
Company blog · moderntreasury.com/journal · on HN as mattmarcusbusinessprogramming
Modern Treasury Journal is the company blog at moderntreasury.com, writing about business and programming. Since 2019, 35 different Hacker News readers have linked it 90 times, most often “Accounting For Developers, Part I”. It is still writing: the last post was on 2026-09-23, and you can follow it by feed.
A payment service provider (PSP) for fiat and stablecoin. Launch in days with one API, sub-accounts, and built-in compliance across ACH, RTP, FedNow, and wire.
Most-linked posts?
- Accounting For Developers, Part I6 people · 6 mentions · first linked 2022-08-17
- /learn/what-is-fednow4 people · 9 mentions · first linked 2022-01-01
- Adding Optimistic Locking to an API2 people · 2 mentions · first linked 2021-08-26
- How to Scale a Ledger DB2 people · 2 mentions · first linked 2023-01-10
- Modern Treasury2 people · 2 mentions · first linked 2019-09-03
- A Complete Primer to ACH: Understanding the Four Key Players2 people · 2 mentions · first linked 2020-05-30
- What Happens When You ACH a Dead Person?2 people · 2 mentions · first linked 2019-08-28
- We switched to cursor-based pagination2 people · 2 mentions · first linked 2022-08-17
What Hacker News says?
It might be able to! I was being a little conservative. It's possible that some of the more obscure abilities of ACH, like death notification entries[1], won't be needed in FedNow or will be replaced separately. But that's idle speculation on my part. [1]: https://www.moderntreasury.com/journal/what-happens-when-you...
Comment linking /journal/what-happens-when-you-ach-a-dead-person
on “Fed announces details of new interbank service to support instant payments”Submitted Accounting For Developers, Part I as a story · 648 points
HN discussionI read an article from Modern Treasury that advocated for mutable pending transactions to vary entry amounts by replacing entries¹, which is just about the worst idea I ever heard in the design of a DE system, and their reasoning boiled down to: if you're running a settlement system but are too lazy to implement a clearinghouse layer separately, no worries, just violate the entire DE covenant instead. So I'd take an…
Comment linking /journal/how-to-scale-a-ledger-part-ii
on “Engineers do not get to make startup mistakes when they build ledgers”Submitted Accounting for Developers, Part II as a story · 333 points
HN discussionThese articles might be a good starting point: https://martin.kleppmann.com/2011/03/07/accounting-for-compu... https://www.moderntreasury.com/journal/accounting-for-develo...
Comment linking /journal/accounting-for-developers-part-i
on “Engineers do not get to make startup mistakes when they build ledgers”Submitted What Happens When You ACH a Dead Person? as a story · 254 points
HN discussionYou're conflating two separate things: bank-to-bank person-to-person transfers and Adyen, which is a merchant acquirer. Merchant acquirers and credit networks operate under different terms. Chargebacks exist because there is a demand for them. They exist because customers want them - and yes, even businesses want them. It gives folks the confidence to buy without having to worry about trusting the merchant (because…
Comment linking /learn/what-is-fednow
on “$625M worth of ETH drained on Axie Infinity's Ronin Network”Submitted Accounting for developers part III – building a lending marketplace as a story · 152 points
HN discussionTheres quite a few examples, it's a space where banks are trying to hold ground against fintechs, or they'll be forced to partner with them One example i can think of right off the top of my head: INTEGRATIONS Integrate Increase APIs Modern Treasury’s powerful REST API is the easiest way to integrate your Increase bank accounts with your application for payments, reconciliation and reporting. https://www.moderntreas…
Comment linking /integrations
on “Increase: Banking API”Submitted Building Payments for an Insurance Startup as a story · 133 points
HN discussionSeems to be similar to Modern Treasury [1]. Are the use-cases similar between Increase and [1]? [1]: https://www.moderntreasury.com/
Comment linking /
on “Increase: Banking API”Submitted How to Build an Escrow Product as a story · 125 points
HN discussionRemember, this was all done on paper before software with tagging and such existed. I'll give a description shot, since I've been doing finance work recently. Other people can feel free to correct. A company using double entry (as opposed to single) has a "chart of accounts." This means they have a bunch of imaginary accounts for tracking everything, including: - Assets (e.g. cash on hand.) - Liabilities (e.g. loans…
Comment linking /journal/accounting-for-developers-part-i
on “Double-entry bookkeeping as a directed graph”Submitted We switched to cursor-based pagination as a story · 120 points
HN discussionThis is true, but with that said 54 countries have instant payments [1] [2]. This number will only grow, as you’re just pushing messages around queues. Once Congress lit a fire under the Fed, it’s only taking ~4-5 years to roll out instant payments in the US. This is very fast for such endeavors. Your average financial consumer in most countries is going to trust their bank and government to protect their fiat vs cr…
Comment linking /journal/real-time-payments-around-the-world
on “SafeDollar ‘stablecoin’ drops to $0 following DeFi exploit on Polygon”Submitted How to Build an Income Sharing Agreement Product as a story · 120 points
HN discussionhttps://www.moderntreasury.com/learn/what-is-fednow > FedNow is an instant payment service for both individuals and businesses. Once launched, the initial transaction limit will be $25,000. This means that FedNow be more useful for small businesses and retail payment needs until it is widely adopted and the transaction limit grows. > In early 2022, the Federal Reserve released pricing and fee details for their real-…
Comment linking /learn/what-is-fednow
on “Can the Visa-Mastercard duopoly be broken?”Submitted What Is the PCI of Bank Payments? as a story · 101 points
HN discussionModern Treasury ( https://moderntreasury.com ) | San Francisco | Full-Time | REMOTE We're hiring full time software engineers to help us build a reliable and scalable payment operations hub. Our tools automate the full cycle of money movement—from payment initiation, through approvals, to reconciliation—and are accessible through web application or API. Businesses in all kinds of industries use Modern Treasury to pr…
Comment linking /
on “Ask HN: Who is hiring? (July 2021)”Submitted Adding Optimistic Locking to an API as a story · 74 points
HN discussionModern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from…
Comment linking /careers?utm_source=yYPEbOqnBd
on “Ask HN: Who is hiring? (November 2021)”Submitted Status page for SVB payment systems as a story · 31 points
HN discussionModern Treasury ( https://moderntreasury.com ) | San Francisco | Full-Time | REMOTE We're hiring full time software engineers to help us build a reliable and scalable payment operations hub. Our tools automate the full cycle of money movement—from payment initiation, through approvals, to reconciliation—and are accessible through web application or API. Businesses in all kinds of industries use Modern Treasury to pr…
Comment linking /
on “Ask HN: Who is hiring? (August 2021)”Submitted Bringing Agentic AI to Payment Operations as a story · 24 points
HN discussionModern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $48M in backing from Y…
Comment linking /careers?utm_source=yYPEbOqnBd
on “Ask HN: Who is hiring? (October 2021)”Submitted Will FedACH process ACH payments on the National Day of Mourning, Jan 9, 2025? as a story · 22 points
HN discussionModern Treasury | Software Engineers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $133M in backing from…
Comment linking /careers?utm_source=yYPEbOqnBd
on “Ask HN: Who is hiring? (January 2022)”Submitted How We Built Ledgers for High Throughput as a story · 22 points
HN discussionModern Treasury | Software Engineers and Product Managers | SF, NY, or Remote (US only) | Full-Time | https://www.moderntreasury.com Modern Treasury is a payment operations platform for high growth fintech companies and marketplaces. We're used by companies like Gusto, Pipe, Marqeta, BlockFi, and ClassPass to help them move and manage money at scale. We do over $2B in payments monthly and are growing rapidly, with $…
Comment linking /careers?utm_source=yYPEbOqnBd
on “Ask HN: Who is hiring? (March 2022)”Submitted Enforcing Immutability in Your Double-Entry Ledger as a story · 21 points
HN discussion
