The mechanics of what happens when a payment moves on stablecoin rails, not in theory, but in the specific sequence of events that determines whether it arrives in minutes or hours.
A USD stablecoin payment involves several distinct components that are often described as a single thing. Understanding them separately is the prerequisite for understanding how and why the process performs the way it does.
The stablecoin itself is a token, a digital representation of a dollar, issued by a licensed issuer such as Circle for USDC, and backed by reserves of cash and short-term US Treasury securities. Following the GENIUS Act signed in July 2025, permitted payment stablecoin issuers in the United States are required to maintain 1:1 reserves and publish reserve compositions monthly.
The blockchain network is the settlement layer. USDC is available on multiple networks including Ethereum, Solana, Base, Avalanche, and Polygon. The choice of network determines settlement speed, transaction cost, and finality characteristics.
Tracing a specific payment, a business in London paying a contractor in Lagos using stablecoin settlement, illustrates the sequence. The London business initiates a payment through their payment provider. The provider converts GBP to USDC at the current market rate. The USDC is transferred on-chain to the destination address. On Ethereum, confirmation to finality takes approximately 12 to 64 seconds. Once the USDC has reached the destination address, the off-ramp process begins. The partner in Nigeria converts USDC to NGN and initiates a bank transfer through the NIP system.
In the Blaaiz infrastructure, the Nigeria corridor uses the NIP network for final credit, which means payments initiated outside Nigerian banking hours complete when NIP processing resumes. The Kenya corridor uses M-Pesa mobile money for final credit, which processes 24/7 and can achieve end-to-end settlement in under 30 minutes regardless of time of day.
When evaluating stablecoin payment infrastructure, the relevant questions are: what are the finality characteristics of the chosen network, how is the FX conversion handled, who is the off-ramp partner in the destination market and what settlement rails do they use, and what compliance layer sits between initiation and execution.
