PayPal USD
Paxos Trust Company (for PayPal)
Market cap (static): ~$0.9B
Overview
Most UX-focused stablecoin with deep fintech integration across PayPal and Venmo (400M+ users). Issued by Paxos (NYDFS-regulated). The Solana deployment uses Token Extensions (Token-2022) enabling confidential transfers, transfer hooks, and memo fields natively in the token program.
Features
Engineering-oriented breakdown of capabilities: standards, who they matter for, integration rationale, per-feature risks, and vetted external references (specs, docs, verified source).
| Feature | Standards | Audience | Why it matters | Risk / caveat | References |
|---|---|---|---|---|---|
Solana Token-2022 extensions authorization |
| Both | Solana program features differ from EVM — wallets and programs must explicitly support Token-2022. | Not all Solana tooling supports extensions; silent failures possible. | |
Confidential transfers compliance | — | Corporate | Privacy feature when enabled changes indexing and compliance visibility — monitor Paxos rollout. | Compliance tooling may not see amounts; regulatory uncertainty for travel rule. | |
Transfer hooks compliance |
| Corporate | Per-transfer program invocation enables allowlists and policy hooks — Solana integrators must account for compute and failure modes. | Hook failure can block transfers; program upgrade risk. | |
Memo field transfers authorization | — | User | Attach structured metadata to transfers — useful for settlement references and reconciliation. | Memo abuse or PII in memos can create compliance issues for indexers. | |
Permanent delegate — Paxos compliance | — | Corporate | Delegate authority for regulatory freeze/seize on Solana — disclose to end users in custody products. | Similar to centralized freeze on EVM Paxos tokens. | |
LayerZero OFT burn-and-mint cross chain |
| Both | Cross-chain PYUSD uses burn/mint pattern — follow LayerZero peer configuration like other OFT assets. | Bridge risk if peers mis-set; verify official OFT deployment addresses. | |
PayPal/Venmo unified balance compliance | — | User | Custodial UX layer — on-chain balance may not reflect app balance; integrations should not assume 1:1 with PayPal ledger. | Off-chain ledger and on-chain wraps can diverge during incidents. | |
3.7% APY on PYUSD yield | — | User | Custodial yield product — not on-chain DeFi yield; terms set by PayPal, not smart contracts. | Yield can change; not FDIC insured; counterparty to PayPal/Paxos stack. |
EIP / ERC support matrix
Standards support for PYUSD. Click an EIP to jump to the global deep-dive section.
| Standard | Status | Notes |
|---|---|---|
| ERC-20 Fungible token standard | Implemented | Broadly USDC-class integration surface with extra batch and legacy approval helpers. |
| EIP-712 Typed structured data signing | Implemented | Wallets and relayers can reconstruct signing payloads without hardcoding mismatched hashes. |
| EIP-2612 Permit — gasless ERC-20 approval | Implemented | Same integration playbook as USDC permit for most DeFi routers. |
| EIP-3009 transferWithAuthorization | Implemented | Enables single-call sponsored payments comparable to USDC EIP-3009 integrations. |
| EIP-1967 Standard proxy storage slots | Implemented | Explorers and Tenderly can attach the correct implementation ABI when slots are standard. |
| EIP-1822 UUPS — universal upgradeable proxy | Unknown | Minor gas and audit surface differences for forks. |
| ERC-4626 Tokenized yield vault standard | Not implemented | On-chain ERC-4626 integrations apply to other protocols, not base PYUSD. |
| EIP-1271 Signature validation for smart contracts | Not implemented | May lag USDS-style institutional smart-wallet ergonomics unless middleware wraps PYUSD. |
Technical notes
Ethereum — ERC-20 FiatToken (Paxos standard) with assetProtection (freeze), supplyController (mint/burn), pausing. Solana — Token-2022 program address: TokenzQdBNbLqP5VEhdkAS6EPFLC1PHnBqCXEpPxuEb. Initialized extensions at mint creation: ConfidentialTransferMint (not yet active), TransferHookAccount (null program for future use), PermanentDelegate (Paxos authority), TransferFeeConfig (0% currently), MemoTransfer. LayerZero escrow on Solana: 6JHAfeFjJLrn9enjvBUsmqLSy8B8Wyobr4uXuPVKyjhT. Devnet contract: CXk2AMBfi3TwaEL2468s6zP8xq9NxTXjp9gjMgzeUynM.
Reserves & peg
- Reserves
- USD deposits, US Treasuries, cash equivalents
- Collateral
- Fiat (off-chain)
- Peg mechanism
- Hard 1:1 via Paxos redemption
- Auditor
- Withum (monthly attestation)
Ecosystem
- DeFi integration
- Kamino, Marginfi (Solana); Aave (Ethereum); emerging
- Yield
- 3.7% APY via PayPal (custodial)
Risk factors
Networks & contracts
Deployments by chain — primary rows are highlighted. Always verify addresses against issuer docs before mainnet integrations.
Engineering deep dive
Integration notes
On Solana, PYUSD uses Token-2022 extensions—wallet and program support varies. On Ethereum, Paxos FiatToken patterns (freeze, pause) mirror other Paxos-issued assets.
Product surface
PayPal/Venmo custody and promotional yield are off-chain—on-chain integrations should still assume standard issuer controls.