Followthecrumbstobetterpayments.
The friendliest nanopayments platform on the planet. Tiny transactions, zero hassle — just crumb.finance/@you.
Already have a link? Try crumb.finance/@demo
Payments, finally simple
Everything you hated about crypto payments — gone.
No wallet setup
We create a smart wallet for you at sign up. No seed phrases, no extensions.
Zero gas fees
Payments are signed off-chain and settled instantly via x402 — gas is covered by the network.
Any chain, one handle
Withdraw USDC to Arc, Base, Ethereum, Solana and 5 more chains from a single @handle.
How it works
From sign-up to settled — three steps, zero gas.
Create your handle
Sign up with an email. We generate a smart wallet for you in-browser and encrypt your key with your password. We never see it.
Sign & settle instantly
When you send USDC, your browser signs an EIP-712 message. The payment verifies and settles on-chain in one step — no waiting.
Zero gas, every time
Arc's Gateway handles gas so you never pay fees. Every transaction is atomic — verified, settled, and recorded in a single call.
Built for everyone
Whether you're a person, a business, or a bot — Crumb works for you.
Your personal payment link
Get a handle like @yourname and share it anywhere. Anyone can pay you USDC instantly — no app install, no wallet required on their end.
- Shareable QR code & payment link
- Withdraw to 9 chains from one place
- No seed phrases, ever
Monetize any API in 3 lines
Install the Crumb SDK, add one line of middleware, and charge for any endpoint. Payments settle instantly — no payment processor needed.
- npm install crumb-alpha-sdk
- Express middleware: provider.require('$0.001')
- Monitor payments from your dashboard
Programmable micropayments
AI agents use crumb.fetch() to pay for API calls automatically. Sub-cent payments with no gas overhead — built for machine-speed commerce.
- Sub-cent payments that actually make sense
- Atomic settle — verify and record in one call
- crumb.fetch() handles payment automatically
Security by design
Your keys, your money. We architect around the assumption that the server is compromised.
Zero-knowledge key storage
Your private key is generated and encrypted in your browser using AES-GCM. The server only ever holds an encrypted blob — it cannot sign transactions on your behalf.
600,000-iteration PBKDF2
Your encryption key is derived with 600,000 PBKDF2-SHA256 iterations. Brute-forcing the encrypted blob is computationally infeasible.
Dual-password recovery
Set a separate recovery password at sign-up. If you forget your login, you can re-encrypt your key without the server ever seeing it in plaintext.
Withdraw USDC to 9 chains
Arc
Base
Ethereum
Solana
Avalanche
Polygon
Arbitrum
Optimism
NobleReady to ditch gas fees forever?
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