Loop Crypto

Loop Crypto is a payment infrastructure company founded in 2022 and headquartered in Chicago. It gives merchants, billing platforms, and e-commerce operators the ability to accept cryptocurrency and stablecoin payments — including recurring subscriptions — without building their own blockchain integrations. Loop supports Solana alongside six other networks and positions itself as the on-chain equivalent of credit-card autopay.

How It Works

Loop's core mechanism is a "pull payment" model. Rather than asking a customer to sign a new transaction every billing period, Loop asks the customer to authorize their wallet once. After that authorization, Loop's infrastructure charges the wallet automatically at each scheduled interval — monthly, annually, or at any cadence the merchant configures. This mirrors how a credit card autopay works, but the settlement happens on-chain in stablecoins or other supported tokens.

Architecturally, Loop began as a fully on-chain smart contract system and has since evolved into a hybrid model: the critical payment-authorization logic lives on-chain, while the scheduling, retry, and routing logic runs off-chain. The result is an API-first platform that merchants and software vendors can integrate into existing billing stacks without deploying their own smart contracts or managing wallet infrastructure directly.

A key design choice in the smart contracts is the absence of "infinite allowance" functions. Customers grant only the specific amount required per billing cycle, and only the merchant counterparty can debit from those approvals. This limits the attack surface compared to protocols that allow unlimited token approvals.

Supported Networks and Assets

Loop's default network list covers seven chains:

• Solana (SPL tokens, including USDC on Solana)
• Ethereum
• Optimism
• Base
• Polygon
• Arbitrum
• BNB Smart Chain

Merchants can request support for any additional EVM-compatible network. Loop accepts ERC-20 tokens on the EVM side and SPL tokens on Solana. Stablecoins dominate actual usage: approximately 98% of Loop's payment volume is settled in stablecoins, reflecting the practical preference of both merchants and customers for price-stable settlement.

Loop integrates with more than 500 external wallets, including MetaMask, Coinbase Wallet, and Rainbow, through Dynamic's Wallet Connectors. This multi-chain wallet infrastructure means customers on both EVM networks and Solana can authenticate and authorize payments through the same checkout flow.

Product Features

Loop offers three primary payment modes:

1. Recurring subscriptions — Customers authorize once; Loop handles subsequent charges automatically. Suitable for SaaS billing, media subscriptions, and any service with a regular billing cycle.
2. One-time payments — A customer authorizes a wallet charge for a single transaction only.
3. Invoicing — Merchants can generate and send crypto invoices and track payment status.

On the merchant side, Loop provides a dashboard with two-factor authentication (2FA) login, transaction monitoring, and reporting. Customers get a self-service portal where they can view invoices, manage active subscriptions, and review billing history.

For settlement, merchants can choose to receive funds in crypto or in fiat. This flexibility matters for businesses that want the reach of crypto rails but prefer to hold their treasury in traditional currency.

Integrations

Loop is built to slot into existing payment and billing stacks rather than replace them. Current integrations include:

• Stripe — Merchants already using Stripe can add crypto payment support through Loop.
• OpenPay — For buy-now-pay-later and installment workflows.
• Chargebee — Subscription management integration (in progress at time of writing).

Additional integrations with Quickbooks, Xero, and NetSuite have been announced with waitlists open. The API-first design means Loop can also be embedded directly into custom billing systems without relying on these pre-built connectors.

Solana Integration

Loop added Solana in 2024 after increasing demand from clients wanting Solana-native payment options. At the time of launch, Solana carried over $3.5 billion in circulating stablecoins, making it a practical settlement layer for high-throughput merchant payments.

Since deploying on Solana, the chain has become one of Loop's most active networks. Infrastructure-scale clients — platforms running subscription billing for large user bases — have driven adoption, taking advantage of Solana's low transaction fees compared to Ethereum mainnet. Loop supports SPL token payments including USDC on Solana, and the Dynamic wallet integration allows customers to connect Solana wallets through the same interface used for EVM wallets.

Team and Background

Loop was co-founded by Eleni Steinman, who serves as CEO. Steinman's background is in public policy — she worked at the U.S. State Department and the White House during the 2008 financial crisis before moving to the private sector. She joined a blockchain scaling startup in Chicago, where she met her co-founder, and the experience of navigating payment friction in early crypto networks became the basis for Loop. Jeff Cangialiosi serves as Head of Business Operations.

Funding

Loop raised a $4 million seed round in April 2022, led by a16z crypto (Andreessen Horowitz's crypto fund). Other seed investors included A_capital, Alchemy Ventures, CoinList, and angel investors Paul Veradittakit (Pantera Capital), Lauren Stephanian, Imran Khan, and Alex Svanevik (Nansen).

In 2025, Loop closed a $6 million strategic round co-led by VanEck and Fabric Ventures, bringing total funding to $10 million. The later round reflects continued investor conviction in stablecoin payment infrastructure as a distinct layer in the Web3 payments stack.

Security

The smart contracts underlying Loop's payment authorization are designed to avoid common DeFi attack vectors. The absence of infinite token approvals means user wallets cannot be fully drained through a compromised or malicious merchant key. Only the authorized counterparty merchant account can initiate debits. The merchant dashboard requires 2FA. No public third-party audit report was identified in available sources at the time of writing.

Fit in the Solana Ecosystem

Loop fills a gap between raw on-chain capabilities and practical business billing. Most Solana wallets and DEX infrastructure is oriented toward user-initiated transactions; Loop adds the infrastructure for merchant-initiated, scheduled, and recurring charges. As stablecoin issuance on Solana has grown and global businesses look to replace cross-border wire transfers and foreign exchange costs with stablecoin rails, Loop provides a ready integration layer that connects those businesses to Solana without requiring them to build blockchain infrastructure themselves.

The unexpected adoption vector — non-Web3 companies, particularly international AI startups, using Loop to bill globally without FX friction — points to a broader pattern: Solana's stablecoin liquidity is becoming a practical alternative to correspondent banking for companies that operate across many countries.