Message visualizers
Paste a NACHA file, an ACH ACK, a Fedwire message, or a FedNow ISO 20022 payload — get a field-by-field breakdown, validation, and plain-English explanations. Everything runs locally in your browser.
ABOUT FINSTACKCLOUD
We make Federal Reserve payments visible.
The rails that move trillions of dollars through the U.S. financial system run on NACHA files, Fedwire tags, and ISO 20022 messages that almost no one outside an engineering team can actually read. PlinthRail is building the tools to change that.
Founded
2026 · Texas, USA
Parent
Tigrate Technology L.L.C.
Status
Building in the open
01 — Why we exist
Payment infrastructure is locked behind the backend.
If you've ever tried to debug an ACH return, certify a Fedwire integration, or explain to a compliance reviewer what just got rejected — you've felt it.
Federal Reserve rails are powerful, but they speak in formats designed for machines: NACHA fixed-width records, ISO 20022 XML, Fedwire tag-value messages, X9.37 check images. Looking inside a single payment today usually requires a developer, a terminal, and working knowledge of standards that haven't been meaningfully updated in decades.
That means testers can't test without engineering, managers can't sanity-check what shipped, and compliance can't audit without a translator. Every release cycle absorbs the cost.
The fix isn't another SDK. It's making the messages themselves visible.
We've lived this. Our founder spent ten years inside payments and compliance — leading teams of 50+ people, integrating directly with the Federal Reserve from connectivity layer to message format, onboarding sponsor banks through core processors, and watching the same friction repeat at every fintech that touches these rails.
Others have written excellent articles about how these rails work. We wanted to go further — to put the rails directly on screen, decoded and explained, for everyone on the team to see.
02 — What we're building
Tools that show you exactly what's moving through the rails.
The product line starts where the pain is sharpest — message visibility — and expands outward into the full compliance stack.
Rail reference wiki
Practical documentation for ACH, Fedwire, FedNow, and Check 21 — written from real integrations, not vendor marketing. Every edge case we've hit, every field we've debugged, every gotcha we wish we'd known on day one.
Format playbooks
End-to-end walkthroughs of how a payment actually moves through the system — origination through settlement — with failure modes called out at each hop. For engineers shipping integrations, and the teams who depend on them.
Stablecoin & screening tools
Next on the roadmap: stablecoin transaction decoding alongside the FRB rails, followed by KYB and KYC screening — designed with the same visibility-first principle, so every decision is auditable and explained, not just a black-box pass or fail.
03 — Who it's for
Built for everyone on the team — not just the engineers.
Most payment tooling assumes the user is a backend engineer. We assume the opposite: payment work lives across roles, and the bottleneck shows up whenever one role has to wait on another to read a message.
ENG
Developers
Ship integrations faster with reference messages, format validation, and worked examples drawn from production traffic.
QA
QA & testers
Verify payment flows end-to-end without filing a ticket every time a field looks wrong.
OPS
Operations & managers
See what's actually flowing through your rails — in real time, in language you can act on.
CMP
Compliance teams
Audit message-level activity directly, without a developer translating in the middle.
04 — Where we're headed
A visibility-first stack, one rail at a time.
Now · 2026
Federal Reserve message tooling
ACH (NACHA), Fedwire (ISO 20022 & legacy tag-value), FedNow (pacs.008 / pacs.002), Check 21 (X9.37) — visualizers, parsers, and reference docs.
Up next
Stablecoin rails
Bringing the same visibility-first treatment to on-chain payment flows — transaction decoding, peg mechanics, and the bridges between stablecoin movements and traditional banking rails.
After that
KYB & KYC screening
End-to-end onboarding and screening with the same principle — every decision auditable, explained, and scored, not just a black-box pass or fail.
05 — A note from our founder
"
I've spent the last decade on the wrong side of these messages — writing parsers, debugging returns at 2 a.m., explaining to non-engineers what a SEC code is for the hundredth time.
Others have done excellent work writing about how these rails work. We wanted to go further: show them. Decode them. Make every tag, every charge bearer, every settlement amount something a tester can read at a glance and a manager can verify without filing a ticket.
PlinthRail is the tool I wish I'd had on day one of every payments integration I've ever shipped — and we're building it for everyone else who's been in that seat.
Our Founder
PlinthRail · Tigrate Technology L.L.C.
Want to see your payments?
Try a visualizer in your browser, read the wiki, or get in touch. No file uploads, no cookies, no friction.