Tax liens, onchain.

1. Abstract

ParcelFi is a protocol for tokenized US tax lien markets on Base. Tax liens are one of the oldest yield-bearing instruments in America: counties sell liens on delinquent property taxes, and state law entitles the lien holder to a statutory interest rate — typically 8–25% — secured by a first-position claim on the underlying real estate. Access has historically been limited to local auctions and institutional buyers.

ParcelFi brings this asset class onchain. Positions are purchased with USDC, accrue yield per second at each market's statutory rate, and can be exited at any time. All accounting — principal escrow, yield accrual, fees — is enforced by an open-source smart contract verified on the Base explorer.

2. Why tax liens

Tax liens combine three properties that are rare in a single instrument: a rate of return defined by statute rather than market sentiment, seniority to mortgages in most US jurisdictions, and collateralization by real property. Counties have issued them for over a century because they reliably convert delinquent taxes into revenue.

Despite this, the market is deeply fragmented — thousands of county auctions, paper-based processes, and minimum capital requirements that exclude most individual investors. Tokenization solves distribution: a single onchain market can expose the same defined-term, defined-rate structure to anyone with a wallet.

3. Protocol design

The ParcelFi Markets contract holds a registry of county markets, each parameterized by a statutory interest rate (basis points), a maximum term (months), and a face-value funding cap. Users buy into a market by transferring USDC; the contract escrows principal and records the position.

Yield accrues continuously: each position earns its market's statutory rate on net principal, pro-rata per second, capped at the market's maximum term. Selling returns the full principal plus accrued yield in a single transaction.

A 1% protocol fee is charged on each buy and accumulates in a separate fee pool. The remaining 99% becomes escrowed principal. Fees never touch user principal.

4. Yield mechanics and solvency

Yield is paid from a dedicated rewards pool funded by the protocol treasury. This is a deliberate design choice for the current phase: real-world lien redemptions are not yet flowing onchain, so yield is treasury-funded rather than generated by the underlying certificates.

The contract enforces a strict solvency rule: user principal is always redeemable in full, regardless of the rewards pool balance. If the pool cannot cover accrued yield, the seller receives full principal plus whatever portion of yield the pool can pay. The owner can only withdraw from the rewards and fee pools — never from escrowed principal.

5. Contract security

The markets contract is intentionally minimal — a few hundred lines, no upgradability, no external dependencies beyond the USDC ERC-20 interface. Source code is verified on Blockscout and ownership uses a two-step transfer pattern to prevent accidental loss of control.

The contracts are currently unaudited. This is early-stage software and should be treated accordingly: do not deposit more than you are prepared to lose.

6. The $PARCEL token

$PARCEL is the planned ecosystem token, separate from the markets contract — buying lien positions does not require $PARCEL, and the token confers no claim on protocol escrow.

Planned utility includes fee discounts, access to new market launches, and governance over market parameters as the protocol decentralizes.

7. Roadmap

Phase 1: tokenized lien markets on Base mainnet with USDC settlement, per-second yield accrual, and a 1% protocol fee.

Phase 2: independent smart contract audit, secondary marketplace for peer-to-peer position trading, and expanded county markets.

Phase 3: real-world lien custody — acquiring county-issued certificates through a legal entity, with redemption proceeds settling onchain so that yield is generated by the underlying liens rather than the treasury.

8. Disclaimer

ParcelFi is experimental software on mainnet with unaudited contracts. Current markets are not yet backed by custody of real-world lien certificates; yield is paid from a treasury-funded rewards pool. Nothing in this document is investment, legal, or tax advice.