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Pharos
PHAROSlive stablecoin signals

Cash and Treasuries, tokenized 1:1

Centralized issuers custody dollars in bank accounts and short-term Treasuries; tokens are minted and redeemed on demand.

Fiat-cash is the simplest stablecoin design and, by market cap, the dominant one. A regulated or semi-regulated issuer takes a wire of dollars from a customer, parks the dollars in cash deposits, overnight repos, and short-duration U.S. Treasuries, and mints an equivalent amount of token. The token is redeemable back into dollars on demand for qualifying customers. The peg holds because anyone with a primary-market relationship can arbitrage a discount on a secondary venue back into par by redeeming for cash.

In practice this design moves stablecoin risk off the chain and onto the issuer's banking, legal, and reserve-management stack. The tokens are usually freezable. Reserve composition, custodian quality, attestation cadence (the periodic third-party confirmation that reserves match supply), and issuer jurisdiction are the substance of the risk.

Users send USD via wire or ACH to the issuer; the issuer custodies the dollars in cash, repos, and short-term Treasuries; the issuer mints STBL 1:1 and lets holders redeem at any time.User USDwire / ACHIssuer reservescustodied 1:1STBL mintedredeem any time

How it works

The flow, step by step

  1. User wires USD

    A KYC-verified customer wires dollars to the issuer's bank account or its Mint partner. Retail users usually access the token through an exchange instead; that secondary access is why the asset feels 'always at $1' even though only the primary market actually redeems.

  2. Issuer holds reserves

    Cash sits in a Tier 1 mix — bank deposits, overnight Treasury repos, short-duration T-Bills — at named custodians (BNY Mellon for USDC, DBS and Standard Chartered for USDG), attested monthly or quarterly by an external auditor.

  3. Token minted on-chain

    The issuer mints token 1:1 onto a target chain (natively on multiple chains, or via canonical or third-party bridges). Primary-market holders redeem for cash through the issuer at T+0 or T+1; secondary-market traders rely on arbitrageurs to push price back to par.

Where the design fails

Known failure modes

Banking-rail freeze
On 10 March 2023, Silicon Valley Bank was placed into FDIC receivership with roughly $3.3B of USDC reserves stranded inside it. USDC traded as low as about $0.87 over the weekend of 11–12 March 2023 before federal regulators guaranteed all SVB deposits on 12 March and the peg closed back to $1.00 by 13 March. Reserve segregation does not help if the cash is stuck.
Issuer or custodian failure
The design collapses if the issuer is insolvent, the custodian fails to segregate assets, or attestations turn out to be misleading. NuBits, USDR, and Tether's earlier commercial-paper-heavy reserve profile are the canonical reminders that the off-chain leg is the actual risk.
Holder-level freezing and seizure
Almost every centralized fiat-cash stablecoin can blacklist or burn balances at the issuer's discretion or by court order. Pharos tracks this on /freezewatch; Tether and Circle freeze addresses on most weeks.
Reserve quality drift
Two coins with identical '1:1 backed by U.S. Treasuries' copy can carry materially different risk. Tether's reserves are majority short Treasuries but include a long tail of secured loans, gold, and Bitcoin alongside them; USDC sits inside an SEC-registered government money-market fund and holds only Treasuries, overnight Treasury repos, and bank cash.

What to watch on Pharos

Signals that matter most

  1. 01

    Proof-of-reserves attestor tier and cadence on /stablecoin/[id]/. Big 4 monthly is the gold standard; niche or quarterly is acceptable but slower to respond.

  2. 02

    Freezable status on the detail page and in /freezewatch Status Buckets. For fiat-cash this is almost always Yes; wrappers show Upstream.

  3. 03

    Redemption Backstop route family — fiat-cash tokens show offchain-issuer with banking-rail redemption. Live-direct telemetry is rare; most rows are documented-bound or heuristic.

  4. 04

    Resilience and Collateral Quality on the Safety Score report card. very-low and low slices are normal; any medium or high slice (secured loans, Bitcoin) drops the score.

  5. 05

    Jurisdiction badge. NYDFS, MiCA, and MAS licensed coins behave very differently in a stress event than BVI-only or El Salvador issuers.

  6. 06

    Mint and burn flow on /flows — sustained burn surge against zero mints is the on-chain footprint of a primary-market redemption queue.

Tracked examples

Live coins using this design

Variations

Sub-flavors within the archetype

Pure cash and repo
The Circle Reserve Fund model: majority short Treasuries, a smaller overnight-repo sleeve, and a thin bank-cash float, all in a regulated money-market wrapper. USDC, EURC, USDG, RLUSD, and FDUSD sit close to this template.
Mixed cash with Bitcoin, gold, and loans
USDT's reserve mix includes Bitcoin, gold, and secured loans alongside Treasuries. The peg has held, but the Collateral Quality column on the Safety Score reflects heavier-tail exposure than the pure cash-and-repo profile.
MiCA-regulated non-USD pegs and yield-passthrough wrappers
EURC, EURI, and EURCV are fiat-cash mechanisms wrapped in a different regulatory shell with ECB-rate dynamics. sUSDC, sUSDT, and equivalents are fiat-cash plus a savings vault — the redemption rail is still the issuer's primary market.

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