Castle

Cover Block

Field	Value
Name	Castle (formerly Orqestra)
Tagline	Automated bitcoin treasury solution for small and medium businesses
Headquarters	Miami, FL
Stage	Seed
Business Model	SaaS
Industry	Fintech
Technology	Blockchain / Web3
Geography	North America
Growth Profile	Venture Scale
Founding Team	João Almeida, Stephen Cole
Funding Label	Seed
Total Disclosed	$1,000,000

Links

• Website: https://savewithcastle.com/
• GitHub: https://github.com/orqestra
• Crunchbase: https://www.crunchbase.com/organization/orqestra
• Wellfound: https://wellfound.com/company/castle-io/people
• LinkedIn (co-founder João Almeida): https://www.linkedin.com/in/jo%C3%A3o-almeida-451714a8/

Summary and Signal

Castle, a Miami-based fintech operating under the parent entity Orqestra, sells an automated bitcoin treasury product aimed at small and medium businesses that want to convert a portion of operating revenue into bitcoin without building their own custody or accounting workflow [Crunchbase] [Castle Website]. The company surfaced publicly in mid-2025 with a $1 million seed round led by Boost VC, with participation from Winklevoss Capital, Park Rangers Capital, Epoch VC, and angels [Fintech Review] [Refresh Miami]. The product sits between point-of-sale and bookkeeping infrastructure, automatically routing a configurable share of sales from PayPal, Shopify, Stripe, Square, and QuickBooks into bitcoin while preserving a clean accounting trail [Castle Website] [Nasdaq]. Co-founders João Almeida and Stephen Cole are running a small team out of Miami [Refresh Miami] [LinkedIn]. This is a focused early bet on whether the bitcoin treasury thesis can be productized for the long tail of Main Street businesses. Over the next 12 to 18 months, the signals worth tracking are merchant counts on integrated platforms, the addition of regulated custody partners, and whether Castle can attach a recurring SaaS fee on top of conversion economics.

Data Accuracy: GREEN -- Confirmed by Fintech Review, Refresh Miami, Bitcoin Magazine, and Castle's own website.

Taxonomy Snapshot

Axis	Value
Stage	Seed
Business Model	SaaS
Industry / Vertical	Fintech / Bitcoin treasury
Technology Type	Blockchain / Web3
Geography	North America (US SMB focus)
Growth Profile	Venture Scale
Founding Team	Two co-founders
Funding	Seed, $1.0M disclosed

Company Overview

Castle is the consumer-facing brand of Orqestra [Crunchbase] [GitHub]. Refresh Miami notes the rebrand from Orqestra to Castle and frames the company as a bitcoin treasury platform for small and medium-sized businesses [Refresh Miami]. The company is headquartered in Miami. The co-founding team is João Almeida and Stephen Cole. Almeida's LinkedIn lists him as CTO and co-founder, while the company's about page attributes the CEO role to him [LinkedIn] [Castle Website]. The seed round announced on June 27, 2025, brought in $1 million led by Boost VC with participation from Winklevoss Capital, Park Rangers Capital, and Epoch VC [Fintech Review] [Bitcoin Magazine] [Yahoo Finance]. Proceeds are earmarked for platform development and onboarding US SMB customers nationwide [Fintech Review].

Data Accuracy: GREEN -- Confirmed by Crunchbase, Refresh Miami, Fintech Review, and Bitcoin Magazine.

The Product and the Stack

Castle's product is a layer that sits between a merchant's existing payment and accounting stack and a bitcoin custody backend. The company integrates with PayPal, Shopify, Stripe, QuickBooks, and Square to automatically convert portions of revenue into bitcoin [Castle Website] [Nasdaq] [The AI Journal]. The bookkeeping side of the integration removes cost-basis and tax-lot accounting overhead for SMBs. The Orqestra GitHub organization exists but has no public repositories indexed [GitHub]. Custody arrangements and the regulatory wrapper are not described in public sources.

Data Accuracy: GREEN -- Confirmed by Castle Website, Nasdaq, and Bitcoin Magazine.

Market Research and Opportunity

Castle's SMB bitcoin treasury thesis combines the corporate bitcoin treasury playbook with the embedded-fintech model. The US Small Business Administration estimates roughly 33 million small businesses in the United States; even a low-single-digit-percent adoption rate would represent tens of thousands of paying merchants. Demand drivers include the January 2024 spot ETF approval and a more accommodative federal policy environment for digital assets. Castle's wedge is the automation and accounting integration.

Sizing reference	Figure
US small businesses	~33 million
Castle seed raise	$1.0M
Confirmed integration partners	5

Data Accuracy: YELLOW -- TAM is analogue-based; integration and funding figures confirmed by Castle Website, Nasdaq, and Fintech Review.

The Competitive Field

Castle is positioned as the bookkeeping-native, automated alternative to consumer-grade bitcoin accumulation platforms.

Company	Positioning	Stage / Funding
Castle	Automated bitcoin treasury for SMBs	Seed, $1.0M
Swan Bitcoin	Bitcoin-only accumulation platform	Private
River Financial	Bitcoin-only brokerage	Private

The competitive map includes bitcoin-only platforms (Swan, River), general-purpose crypto exchanges (Coinbase, Kraken), and embedded-finance incumbents (Stripe, Shopify, Square). Castle's defensible edge is the combination of accounting integration and a thesis-pure investor base [Fintech Review] [Bitcoin Magazine].

Opportunity

If Castle executes, the prize is becoming the default treasury and accounting layer through which US small businesses hold bitcoin. The integration footprint is broad, spanning PayPal, Shopify, Stripe, Square, and QuickBooks [Castle Website] [Nasdaq]. The investor syndicate brings custody, licensing, and ecosystem relationships [Fintech Review].

Scenario	Catalyst
App-marketplace wedge	Formal listing or revenue-share deal
Bitcoin-native channel partner	Partnership with custody or brokerage incumbent
Regional accountant channel	QuickBooks ProAdvisor listing

Data Accuracy: YELLOW -- Scenario analysis is analyst inference; underlying integration, funding, and investor facts confirmed by Castle Website, Fintech Review, Nasdaq, and Bitcoin Magazine.