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Receipts by OpStart

Receipts by OpStart

By: Paul Anthony
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Receipts is a podcast from OpStart about the financial side of building a startup — the part most founders only talk about in private. Each episode digs into the real numbers behind the build: burn rate, runway, R&D credits, fundraising scars, the first real CFO conversation. The decisions that worked, the ones that didn't, and what the spreadsheets actually said when things got hard. Made for founders pre-seed through Series C — the ones doing the work, not posting about it. No spin, no recycled LinkedIn wisdom. Just candid conversations with founders, operators, and the finance pros keeping the back office in order so the rest of the company can grow. If you've ever wondered what the journey really costs, Receipts is the paper trail. Presented by OpStart, the finance team behind the build.Copyright 2026 Paul Anthony Economics Leadership Management & Leadership
Episodes
  • Scaling pickleball leagues: zero to 65 cities in 18 months
    Jun 10 2026

    In this episode, we sit down with Tommy Flaim, founder of Silly Pickles, to unpack how he built one of the fastest-growing adult rec sports communities in the country.

    Tommy shares his journey from investment banking to launching (and winding down) his first startup, and how he stumbled into building a scalable, software-powered league model that’s now live in 65+ cities.

    We discuss:

    • Why most adult rec leagues fail to attract young professionals

    • How Silly Pickles scaled to a $3.4M run rate in 18 months

    • The franchise-style operating model behind 100+ facility partners

    • Raising capital while building custom software from scratch

    • What founders should know before quitting their job

    Guest: Tommy Flaim, Founder, Silly Pickles

    🌐 Silly Pickles: sillypickles.com

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    39 mins
  • An API Key for Batteries: How Proper Voltage is Powering the Hardware Decade
    Jun 3 2026

    Greg Slauson, CEO of Proper Voltage, joins Paul Anthony to unpack how a career that started selling structured fixed income on a Goldman Sachs trading floor led him through a solar fintech rocketship, a caramel apple business bought with an SBA loan, and ultimately to building the intelligence layer that turns batteries from a limiter into an enhancer. Greg and Paul have been friends for 12 years, since they were randomly paired as summer intern roommates in Chicago, and Proper Voltage runs its accounting and tax through OpStart, so the conversation moves easily between deep technical detail and the real mechanics of building a company.

    From there the conversation works through a founder's education the hard way: growing a capital markets team from two people to mid-twenties at GoodLeap, buying and operating Daffy Apple while juggling two other jobs at 90-hour weeks, and learning that a 40-year-old running an HVAC business often knows more than a fresh MBA. Greg is candid about why he walked away from fintech entirely, why he believes the back half of the 2020s belongs to hardware, and how that thesis led him to a six-person battery startup he convinced to hire him.

    The result is Proper Voltage, the battery operating system that digitally adjusts voltage so products get full power through the entire discharge, enables new chemistries to plug into existing systems, and unlocks features like hot-swapping for robots and data centers. Greg and Paul close on the parts most founders underrate: why working capital is the lifeblood of a hardware business, why chasing headline revenue numbers can quietly kill you, and why the little things, down to whether a deck says Q1 or Q2, compound into trust.

    In this episode, you'll learn:

    - Why Greg optimized his early career around who he worked for instead of salary or title, and how that compounded over 12 years

    - What buying and running a seasonal caramel apple business taught him that 90% transfers to companies of any size

    - How Proper Voltage turns a battery from a product's limiter into its enhancer, explained through a power drill, a drone, and a Boston Dynamics backflip

    - Why Greg believes humanoid robotics in 2026 looks like AI did in 2021, and what that means for the next three years

    - How sodium-ion batteries change the safety and economics of data center backup power

    - Why working capital, not just margin, determines how far a hardware company can scale without giving away equity

    - The case for building slow and steady when VCs are pushing for zero-to-$60M in a year

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    56 mins
  • Underwriting Space Exploration | Yuk Chi Chan, Charter Space
    May 28 2026

    In this episode, we sit down with Yuk Chi from Charter Space Technologies to unpack what it takes to build the financial and underwriting infrastructure for the space industry.

    Yuk shares his journey from military engineering to space law, to working inside a satellite manufacturer—where he experienced firsthand how fragmented engineering data and compliance workflows can slow missions down and make insurance painfully difficult to obtain.

    We discuss:

    • Why space is missing the “middle layer” of capital (insurance → debt/credit markets)

    • How better data and systems engineering can improve underwriting and reduce risk

    • The real reason insurance can become a growth unlock for an entire industry

    • A fascinating analogy: how a London coffeehouse helped create modern maritime insurance—and what that means for space today

    🎙️ Guest: Yuk Chi, Charter Space Technologies

    🌐 Charter Space: charter.space

    X Yuk Chi on X/Twitter: @astrolawyer

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    39 mins
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