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open-fintech-builders

open-fintech-builders
@openfi-builders • Created Sep 2025 • Open Source
45 posts • 173 reactions • 79 comments
Open-finance builders: fintech, DeFi, blockchain & crypto, cryptography, inclusive tools. Share code, research & launch.
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Posted in open-fintech-builders group
Pocket Portfolio • 9 hours • in Articles • 2 min read
The Stateless Inference Pipeline: Ephemeral Payloads and Quota Metadata
The Stateless Inference Pipeline: Ephemeral Payloads and Quota Metadata POST /api/ai/chat is Pocket Analyst’s inference hop. The route header in app/api/ai/chat/route.ts states the contract plainly: / Stateless: request payload message, context,...
post-cover-18607
1 Reactions 0 Comments
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Pocket Portfolio • 1 day • in Articles • 2 min read
Sanitization by Construction: Bounded Context Before the Network
Sanitization by Construction: Bounded Context Before the Network Regex redaction on arbitrary broker exports fails the moment a column renames, a locale shifts decimal separators, or a merged cell appears. We chose structural exclusion: the Ask AI ...
post-cover-18604
0 Reactions 0 Comments
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Pocket Portfolio • 2 days • in Articles • 2 min read
The Architecture of Invariant Boundaries: One Deployment, Two Audiences
The Architecture of Invariant Boundaries: One Deployment, Two Audiences Procurement teams ask whether Open Portfolio is a separate product codebase. Engineers ask whether Pocket and Open can drift into incompatible releases. Both questions have the...
post-cover-18603
1 Reactions 2 Comments
Posted in open-fintech-builders group
Pocket Portfolio • May 18 • in Articles • 3 min read
Interview: Pocket Portfolio × CoderLegion
Interview: Pocket Portfolio × CoderLegion 1. An Overview of Your Professional Trajectory in Software Development My introduction to programming commenced at age fifteen with Java, spanning from Standard to Enterprise editions J2SE to J2EE at Emerg...
post-cover-18220
6 Reactions 0 Comments
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Pocket Portfolio • Apr 1 • in Articles • 2 min read
Sovereign Intelligence: The Complete 25,000 Word Blueprint (Download)
Sovereign Intelligence: The Complete 25,000 Word Blueprint Download This 12-part series has walked through the full architecture of Pocket Analyst—the local-first financial AI that keeps your data on your device and sends only a sanitized snapshot ...
post-cover-11982
7 Reactions 4 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 30 • in Articles • 2 min read
Open Sourcing our Financial System Prompts (Code Dump)
Open Sourcing our Financial System Prompts Code Dump This post gives implementers a high-signal reference: system prompt structure, key functions, and file paths. The why matters as much as the what. System prompt outline minimal 1 Role: "You are...
post-cover-11981
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Pocket Portfolio • Mar 25 • in Articles • 2 min read
The Roadmap: Moving from AI Chatbots to Autonomous Financial Agents
The Roadmap: Moving from AI Chatbots to Autonomous Financial Agents Today: user asks, model answers. Tomorrow: user asks, model proposes an action e.g. "Add AAPL to watchlist" and the user confirms. The roadmap: confirmation UI, audit log, no auton...
post-cover-11980
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Posted in open-fintech-builders group
Pocket Portfolio • Mar 24 • in Articles • 2 min read
The Future of Finance is Client-Side AI
The Future of Finance is Client-Side AI Many fintech products lock data in their own APIs and dashboards. Universal Import is a step toward user-owned data: the user exports, holds, and imports; the app is a tool that runs on their data. From SaaS...
post-cover-11444
3 Reactions 1 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 23 • in Articles • 1 min read
Flash vs. GPT-4o: Benchmarking latency for financial reasoning
Flash vs. GPT-4o: Benchmarking latency for financial reasoning We benchmarked Gemini Flash, Pro vs. OpenAI e.g. GPT-4o for financial Q&A. Criteria: latency, quality of financial reasoning, grounding support, cost, and privacy data handling. Gemini ...
post-cover-11979
6 Reactions 1 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 19 • in Articles • 1 min read
Beyond Finance: Use Cases for Client-Side ETL
Beyond Finance: Use Cases for Client-Side ETL Any source that can export CSV can be supported. The same pipeline applies; only the header vocabulary and locale may differ. Brokers, banks, crypto, tax tools Traditional brokers US/UK/EU, banks, cry...
post-cover-11443
7 Reactions 4 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 18 • in Articles • 1 min read
Economic Modeling: Running a free AI tier without going bankrupt
Economic Modeling: Running a free AI tier without going bankrupt Gemini Flash free tier: low cost per token; suitable for most portfolio and market questions. Gemini Pro paid: higher capability and cost; for power users. We estimate cost per query ...
post-cover-11978
2 Reactions 0 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 17 • in Articles • 1 min read
Security & Threat Modeling for Local Apps
Security & Threat Modeling for Local Apps Full CSV never touches your server. Here's what the design guarantees—and how we mitigate the rest. What is never transmitted by design Full CSV: Never sent to the server. Only headers and a small sample ...
post-cover-11442
4 Reactions 4 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 16 • in Articles • 2 min read
Building Tactile AI: Optimistic UI and the Vercel AI SDK
Building Tactile AI: Optimistic UI and the Vercel AI SDK The feeling of "someone is typing"—streaming tokens, optimistic UI updates, clear loading states—makes the assistant feel responsive. We use Vercel AI SDK streamText, useChat for consistent s...
post-cover-11977
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Posted in open-fintech-builders group
Pocket Portfolio • Mar 12 • in Articles • 1 min read
Comparison: Universal Import vs. Plaid/Yodlee
Comparison: Universal Import vs. Plaid/Yodlee Plaid and broker APIs give real-time data—and a long-term liability. Here's how Universal CSV import compares. | Dimension | Universal LLM Import CSV | Plaid / Broker APIs | |--...
post-cover-11441
2 Reactions 1 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 11 • in Articles • 2 min read
Transient File I/O: Parsing massive CSVs in the browser without server storage
Transient File I/O: Parsing massive CSVs in the browser without server storage The user can drop a CSV or text file into the chat to ask "analyze this" or "what do you see?" We parse the file in the browser e.g. with PapaParse, extract text or a ta...
post-cover-11976
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Posted in open-fintech-builders group
Pocket Portfolio • Mar 10 • in Articles • 1 min read
The Interface of Uncertainty: Designing Human-in-the-Loop
The Interface of Uncertainty: Designing Human-in-the-Loop When the heuristic or LLM isn't confident, we don't guess. We show the mapping UI and let the user confirm or correct. That's REQUIRESMAPPING—the interface of uncertainty. Production touchp...
post-cover-11440
6 Reactions 3 Comments
Posted in open-fintech-builders group
Pocket Portfolio • Mar 9 • in Articles • 2 min read
Prompt Guardrails: Forcing an LLM to only talk about finance
Prompt Guardrails: Forcing an LLM to only talk about finance The system prompt defines who the assistant is and what it can do. We use a prompt that constrains the assistant to finance, investing, markets, and economic data. It states: "You are the...
post-cover-11975
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Pocket Portfolio • Mar 5 • in Articles • 1 min read
Google Drive as Dumb Storage
Google Drive as Dumb Storage Google Drive isn't your backend. We use it as file storage for a single export file. The app creates/updates that file and can read it back. Drive does not run business logic, validation, or schema—it's "a folder in the...
post-cover-11439
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Posted in open-fintech-builders group
Pocket Portfolio • Mar 5 • in Articles • 2 min read
AI Grounding: Connecting local data to live stock prices using Gemini 1.5
AI Grounding: Connecting local data to live stock prices using Gemini 1.5 Users ask "What's the current price of AAPL?" or "Any news on TSLA?" The model must not guess; it must use live, authoritative data. Gemini's native grounding e.g. Google Sea...
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Welcome to open-fintech-builders — by Pocket Portfolio


We started Pocket Portfolio because a lot of finance UX felt like a locked room: opaque numbers, dead-ends, and “0.00” when you needed truth. We wanted the opposite—explainable systems you can model, test, and trust. This group is the workshop where we build that kind of internet finance together.


What this space is


A hands-on hub for engineers, designers, and researchers shipping at the edge of fintech, DeFi, cryptography, and open finance. Come here to sketch architectures, argue (kindly) about failure policies, and turn paper ideas into shipped slices.


Our design & tech north stars


  • Explainable > Magical — every number should say why it changed.

  • Keyboard-first = fast — a11y that doubles as speed (grids, shortcuts, roving tabindex).

  • Client → Edge Resilience — timeouts, retries, last-known-good; never show 0.00.

  • Local-first where it matters — scenarios and recent quotes cached on device; privacy by default.

  • Small Slices, Shipped Often — testable diffs beat perfect decks.


What to post (prefix with tags)


  • [DISCUSS] Architecture, DX, a11y patterns, edge/runtime trade-offs.

  • [RFD/RFC] Specs worth breaking: price fallbacks, wallet flows, import pipelines.

  • [LAUNCH] OSS releases, demos, playgrounds, design tokens, Figma kits.

  • [HELP] Debug threads with a minimal repro (gist/repo, redacted data).

  • [REVIEW] “Tear down my modal/interaction/state machine” — we give actionable notes.

  • [LEARN] Paper notes (ZK/Schnorr/MPC/AA), threat models, failure post-mortems.


Weekly rituals


  • Ship Friday — post one screenshot/GIF or diff you shipped this week.

  • Spec Clinic (Wed) — 30-min async review of a single RFD/RFC.

  • Paper Club (Sat) — one cryptography/DeFi paper; five bullets, one diagram.


Starter threads (jump in)


  1. Introductions — stack, timezone, what you’re building.

  2. Resilient Quotes — client→edge fallback designs that never show 0.00.

  3. Import Lab — broker CSV mappings (share one redacted row + expected schema).

  4. Mock-Trade UX — “are we sure?” layer patterns and keyboard accessibility.

  5. Wallet UX & Security — MPC/AA, seedless recovery, signing flows, threat models.


House rules (non-commercial)


  • OSS and learning first. No token pumps, price calls, or affiliate shills.

  • If you represent a company/protocol, disclose and keep it educational.

  • No investment advice. We ship software, research, and design.

  • Be kind; cite sources; prefer reproducible examples; celebrate small wins.


Pocket Portfolio (why we’re here)


We’re building an open-source, no-paywall investing dashboard: CSV → clean live P/L → Mock-Trade & Scenario Lab. We’ll share architecture notes, a11y patterns, and failure policies as we ship.


  • App: pocketportfolio.app/app

  • Repo: github.com/PocketPortfolio/Financialprofilenetwork

  • Build in public: dev.to/pocketportfolio


This is a forum, not a chat: keep updates in your thread (bump with progress), and help one another reach first useful insight in under a minute. Welcome aboard.