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Stable is the first blockchain purpose-built for stablecoin payments. The network is optimized for high-throughput, low-latency stablecoin transactions, delivering P2P payments and merchant acceptance with immediate settlement in USDT. Application-layer gas sponsorship and waivers allow providers to offer a zero-fee experience for end users, providing the feel of a mainstream payments network while abstracting away the complexity of blockchain systems. This page describes the complete lifecycle of funds on Stable — how USDT enters the network, moves between participants, and exits back to fiat rails.

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1. Customer deposit (on-ramp)

A user brings money into the network through one of three primary channels:
  • Crypto transfer: Any major cryptocurrency is bridged or converted to USDT0 on Stable. USDT0 is the omnichain standard for USDT and the primary form factor on the network.
  • Fiat on-ramp: Card, ACH, or local payment method converts fiat to USDT0, delivered directly into the user’s wallet.
  • CEX withdrawal: The user withdraws USDT from a supporting centralized exchange, selecting Stable as the destination network. The exchange settles directly into the user’s wallet.
In all cases the end state is the same: the user’s wallet holds USDT (as USDT0) directly on Stable.

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2. P2P / merchant transfer (on-chain pay-in)

Once funds are on Stable, the customer sends USDT directly to another user or merchant. Key properties of on-chain transfers:
  • Instant settlement — transfers settle on-chain immediately.
  • Non-custodial — in the case of a non-custodial wallet, no PSP or intermediary ever touches user balances between source and destination.
  • Single asset — because USDT is both the gas and settlement asset, there are no extra tokens in the flow and no hidden spreads.
  • Zero-gas option — gas waivers allow end users to move funds without needing to manage blockchain fees. See Gas Waiver for details.

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3. User / merchant balance

Merchants receive USDT in their Stable wallet under their own direct control. Funds are held on-chain under the user or merchant’s custody. These wallets can be created and managed by a payments provider on behalf of the user.

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4. Merchant withdrawal (off-ramp / payout)

When a merchant or user requests off-chain fiat settlement:
  1. The provider initiates a conversion (USDT → fiat) via banking or payout rails.
  2. Funds are credited to the merchant’s chosen account.
The provider re-enters the flow only to cash merchants out — not during intra-ecosystem transfers. Day-to-day P2P flows require no intermediation; providers participate only at deposit (USDT transfer to a merchant’s account) or withdrawal (USDT → fiat).

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Cross-asset trades

Stable also supports scenarios where the payer holds a non-USDT cryptocurrency.

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User trades into another cryptocurrency

A user may hold or trade into another cryptocurrency (e.g., BTC or ETH) through an integrated exchange, broker, or on-chain DEX. At the point of payment the system automatically converts the selected cryptocurrency into USDT, which is then transmitted to the merchant’s Stable wallet. All on-chain settlement continues to occur in USDT regardless of the user’s preferred asset.

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Merchant acceptance of cryptocurrency payments

Merchants do not need to accept or manage multiple cryptocurrencies directly. They are always credited with USDT in their Stable wallet, preserving a single settlement currency across the network. This design minimizes FX exposure for merchants and simplifies reconciliation and reporting.

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Provider’s role in conversion

The conversion logic (e.g., BTC → USDT) may be handled by an exchange partner, liquidity provider, or the payments provider’s own treasury. The merchant remains insulated from volatility or liquidity risks — they only ever receive USDT.
Last modified on April 11, 2026