Anvil Review 2026: Onchain Collateral and Letters of Credit

Anvil describes itself as a universal collateral layer. It is a DeFi protocol on Ethereum for onchain collateral management, letting users issue fully secured credit. DefiLlama files it under Collateral Management and lists it since April 2025.

The pitch is that digital assets can secure financial commitments across consumer finance, commerce and enterprise operations. The homepage shows examples like buy now pay later, a vehicle loan, event reservations and invoice-backed letters of credit.

DefiLlama shows about $15 million in TVL, down 4.3% over seven days, and two audits. The ANVL governance token has its own forum and proposals. A search result reports a $5 million token purchase led by Founders Fund, which we could only see as a snippet and have not verified.

Anvil is a set of Ethereum smart contracts. A user locks collateral, such as WETH, wstETH or cbBTC, and the protocol issues a secured commitment against it. The main example is a letter of credit (LOC): a guarantee to a named beneficiary with a set value and expiration date.

Because the collateral is locked onchain, the beneficiary can rely on the promise without a credit check on the user. In the homepage examples, collateral is released when a reservation ends or comes back as a loan is paid down. A loan example shows a 137% collateral ratio.

Businesses can build this into their own products through an SDK. The business sets terms such as beneficiary and expiration, and the customer chooses the amount and what backs it. Those examples are illustrations, so confirm actual mechanics in the docs.

Anvil's fees are not published. The homepage mockups show a 4.9% APR on a sample vehicle loan and a $8 service fee on a sample checkout, but these are illustrative, not a confirmed fee schedule.

Before using the protocol, check the app and the docs for protocol fees, network gas costs on Ethereum, and any terms set by the business that integrates Anvil.

DefiLlama lists two audits and the homepage describes audited smart contracts, production-grade infrastructure and a Security page. The project does not name the auditors or give findings, so readers should open the audit reports themselves. Collateral sits in smart contracts, so a contract flaw is a real risk, as is a drop in collateral value.

The project does not mention any hacks or incidents. They also do not state the project's regulatory status. Letter-of-credit and credit products may fall under financial rules in some places, so check what applies where you live. This is not financial advice.

Anvil is for crypto-literate users who hold assets like WETH or wstETH and want secured credit, and for businesses or developers exploring collateral-backed payments, reservations or invoicing. It is less suited to people wanting simple swaps or yield, or those uncomfortable locking collateral in smart contracts.