Tools for self-custody, built around the onramp
Everything pay-castle builds keeps you in control of your own keys. Our products are software and information tools. They are not investment products and we make no promise of profit or returns.
Fiat-to-crypto onramp
The core product. Buy USDC, ETH, or USDT with a card or Apple Pay and receive it in your own wallet on Base, Polygon, or Ethereum. Non-custodial, powered by Coinbase.
Open the onramp →Crypto trading-bot software
A configurable, self-hosted automation tool for placing rule-based orders on exchanges you connect with your own API keys. It's software tooling only — you define the rules and run it yourself.
No performance, profit, or return is offered or implied. Trading carries risk, including total loss. Not financial advice.
Self-custody starter guide
A plain-English guide to choosing a wallet, backing up your recovery phrase, and avoiding common scams — so your first on-chain purchase is also a safe one.
Scheduled buys
Set a simple recurring purchase (e.g. weekly USDC) that still settles straight to your own wallet through Coinbase. Cancel anytime; nothing is ever held by us.
Embeddable buy widget
Drop a non-custodial "Buy crypto" button into your own app or store. Your users keep custody; Coinbase handles payments and delivery. Talk to us →
On the roadmap
We're building toward more networks, more assets, and better self-custody onboarding. Have a request? Tell us.
Important: pay-castle does not offer securities, managed accounts, yield, staking returns, or any investment product. Our "trading bot" is configurable software that executes your instructions on exchanges you connect; outcomes depend entirely on your own choices and market conditions. Nothing on this site is financial, investment, legal, or tax advice.