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Stablecoins

Stablecoins are the settlement rail for money — and increasingly for machine-tempo agent commerce.

Stablecoins are room-temperature superconductors for financial services. — Patrick Collison

The Spine​

  • Tether — the largest fiat-backed stablecoin, USD reserves
  • USDC — Circle's regulated fiat-backed dollar
  • SKY — crypto-collateralised, decentralised peg
  • FRAX — algorithmic and fractional-reserve design
  • Ethena — synthetic dollar built on hedged collateral
  • Noble — native issuance for app-chain settlement
  • Radius — algorithmic settlement infrastructure

Zoom Out​

Peg mechanisms run safest to riskiest: fiat-backed, commodity-backed, algorithmic, synthetic dollar — each set by the collateral basket and its trust assumptions. The coin you hold matters less than where it settles: Ethereum finalises in minutes at dollars per transaction, Solana and Sui in sub-seconds at sub-cent fees. That speed is why the x402 protocol routes stablecoins on high-throughput chains for agent commerce — the Three Flows pattern (INTENT → ROUTE → SETTLE) at machine speed. Sui's founders built Move at Meta's Diem; Google chose Sui for AP2; the settlement layer for billions may run on rails the Libra team rebuilt permissionless.

Context​

  • Agent Commerce — The standards war for agent transactions
  • Three Flows — Messages, money, data converge on the same settlement pattern
  • Sui — Sub-second coordination layer for machine-tempo settlement
  • Payments Industry — $25T B2B cross-border flows meet stablecoin efficiency
  • Phygital Beings — The actors who settle: agents, devices, and humans
  • Payment Rails — Platform architecture

Questions​

Which stablecoin model — fiat-backed, algorithmic, or yield-bearing — is most likely to capture the majority of the $25T B2B cross-border payments market?

  • At what regulatory clarity level do banks adopt stablecoin rails for settlement rather than building proprietary CBDC infrastructure?
  • How does the Three Flows convergence (messages, money, data on the same rail) change the competitive advantage of stablecoins versus SWIFT and correspondent banking?
  • Which stablecoin issuer — Circle, Tether, or a bank-issued stablecoin — is most threatened by sovereign CBDC rollouts in the next 5 years?

Changes my mind: evidence that banks and card networks retain settlement volume as agents scale — rather than ceding it to stablecoins — would break the settlement-rail thesis.

Next question: which peg mechanism captures the majority of $25T B2B cross-border flow once regulatory clarity lands?