Stablecoin & Digital Payment Glossary: Essential Terms Explained

TL;DR: A living glossary of stablecoin and blockchain payment terms, updated as the infrastructure evolves. Bookmark this for quick reference when reading articles, vendor docs, or news coverage.

How to Use This Glossary

Bookmark this page. When you encounter an unfamiliar term while reading about digital payments or blockchain infrastructure, find it here for a plain-English explanation and why it matters.

Core Concepts

Stablecoin

A digital token pegged to a fiat currency (typically 1:1 with USD). USDC, for example, is backed by cash and US Treasury securities, designed to always trade at $1.00. Unlike Bitcoin, stablecoins don’t appreciate—they move value predictably across borders at internet speed.

USDC (USD Coin)

The most widely used dollar-backed stablecoin, issued by Circle. As of Q3 2025, $73.7 billion USDC is in circulation, each backed 1:1 by reserves with monthly third-party attestation.

XSGD / XUSD

Regional stablecoins issued by StraitsX. XSGD is pegged to the Singapore Dollar (~$13.8M market cap). XUSD is pegged to the US Dollar (~$44.9M market cap). Both operate on multiple blockchains and hold MAS regulatory approval.

Blockchain / Distributed Ledger

A shared, immutable digital record of transactions maintained across multiple computers. Enables 24/7 settlement, instant verification, and transparent audit trails without a central authority.

Layer 1 (L1) Blockchain

The base blockchain network that processes and finalizes transactions independently. Examples: Ethereum, Solana, Circle’s Arc, Stripe’s Tempo. The foundation layer where settlements happen.

Smart Contract

Self-executing code that automatically enforces agreements when conditions are met. Example: “If payment received, release shipment notification.” No intermediary needed.

Payment Mechanics

On-Ramp

Converting fiat currency (SGD, USD, THB) into stablecoins. The entry gate into blockchain-based payments, typically handled by regulated partners. Fees usually run 0.5-1%.

Off-Ramp

Converting stablecoins back to fiat for deposit into traditional bank accounts. The exit gate from blockchain to conventional banking.

Atomic Settlement / Finality

A transaction that either completes fully and irreversibly, or fails entirely—no “pending” state. Either everything happens or nothing happens! Once confirmed, the transfer is legally and technically complete. No chargebacks, no reversals.

Transaction Fee / Gas Fee

The cost to process a blockchain transaction. On payment-optimized chains like Arc and Tempo, fees are paid in stablecoins (not volatile tokens) and typically run $0.01-0.10 per payment.

Deterministic Finality

Guaranteed permanent settlement once confirmed—zero chance of reversal. “Confirmed” means “done.” Critical for knowing exactly when funds are available. Arc achieves this in ~0.5 seconds.

Cross-Chain Transfer

Moving stablecoins between blockchains (e.g., USDC from Ethereum to Solana). Circle’s Cross-Chain Transfer Protocol (CCTP) handles this by burning tokens on the origin chain and minting them on the destination chain.

Burn and Mint

The mechanism CCTP uses for cross-chain transfers. Tokens are destroyed on the origin chain and created on the destination chain. Maintains 1:1 reserve backing across all blockchains.

Infrastructure Components

Correspondent Banking

The traditional system where banks use intermediary banks to move money internationally. Each correspondent takes a fee ($15-30) and adds delay (24-48 hours). The “soggy middle” that stablecoins eliminate.

Orchestration Platform / Middleware

Software that routes payments across multiple stablecoin networks, on/off-ramps, and compliance systems. Examples: Xweave (ASEAN-focused), Cybrid (North America-focused). They coordinate which rails to use and handle compliance checks.

VASP (Virtual Asset Service Provider)

A regulated entity licensed to handle cryptocurrency/stablecoin transactions. The blockchain equivalent of a licensed money transmitter. StraitsX and Coinbase are VASPs.

MPI (Major Payment Institution) License

Singapore’s MAS licensing for payment providers handling large volumes. Signals regulatory approval for significant payment operations. StraitsX holds four MPI licenses.

Reserves / Reserve Attestation

The fiat currency and assets backing a stablecoin. USDC holds $1+ in reserves for every $1 USDC in circulation. Monthly attestation reports are independent audits confirming this backing.

CPN (Circle Payments Network)

Circle’s institutional payment network connecting financial institutions for real-time cross-border settlement using USDC and EURC. Launched May 2025. As of Q3 2025: 29 institutions enrolled, $3.4B annualized volume.

CCTP (Cross-Chain Transfer Protocol)

Circle’s protocol enabling permissionless USDC transfers between blockchains via burn-and-mint mechanics. V2 launched March 2025. As of December 2025: $126B cumulative volume, 5.3M+ transfers across 19 blockchains.

Financial Metrics

Circulation / Market Cap

Total value of a stablecoin currently issued and in use. USDC circulation: $73.7 billion (Q3 2025). Higher circulation generally means deeper liquidity.

On-Chain Transaction Volume

Total value of transactions processed on a blockchain. USDC processed $9.6 trillion in Q3 2025. High volume indicates active usage and battle-tested infrastructure.

Reserve Income

Interest earned on the assets backing a stablecoin. Circle earns this on USDC reserves—96% of their Q3 2025 revenue ($740M) came from reserve income at a 4.15% return rate.

FX Markup / Spread

The difference between the true mid-market exchange rate and the rate offered. Often hidden in the exchange rate rather than shown as a separate fee. Traditional banks: 1-2%. Stablecoin rails: 0.5-1%.

All-In Cost

Total payment cost including all fees: sending, intermediary, receiving, FX markups, and transaction fees. The only number that matters when comparing payment methods. Traditional banking: 1.5-3.5%. Stablecoin rails: 0.5-2%.

Technical Terms

EVM-Compatible (Ethereum Virtual Machine)

A blockchain that can run smart contracts written for Ethereum. Arc and Tempo are EVM-compatible, meaning developers can use existing Ethereum tools and contracts without rewriting code.

TPS (Transactions Per Second)

Blockchain throughput measure. Tempo targets 100,000+ TPS (currently benchmarking 20,000 TPS on testnet). Higher TPS means the network handles peak volumes without congestion.

ISO 20022

Global standard for financial messaging used by banks (invoice numbers, customer IDs, accounting codes). SWIFT adopted it in 2022. Tempo’s TIP-20 standard is compatible, enabling automated payment reconciliation.

TIP-20 Token Standard

Tempo’s extension of ERC-20 with payment primitives including transferWithMemo (a 32-byte memo field compatible with ISO 20022). Enables real-time reconciliation—ERPs can auto-match payments to invoices in milliseconds.

Testnet vs Mainnet

Testnet: Sandbox for testing. Arc and Tempo are in public testnet (Feb 2026). Features are experimental—don’t build critical operations around them.
Mainnet: Production environment where real value moves. USDC on Ethereum mainnet has $73B+ backing. Arc and Tempo mainnet launches expected 2026.

Arc

Circle’s Layer 1 blockchain purpose-built for institutional stablecoin finance. Public testnet launched October 28, 2025. Key features: deterministic sub-second finality, USDC as native gas token, EVM-compatible. Over 100 launch participants including BlackRock, Goldman Sachs, Visa.

Tempo

Stripe and Paradigm’s Layer 1 blockchain optimized for global commerce. Public testnet launched December 9, 2025. Raised $500M Series A at $5B valuation. Key features: 100,000+ TPS target, TIP-20 standard for payment metadata, dedicated payment lanes, no native gas token (pay fees in stablecoins).

StableFX

Circle’s institutional-grade stablecoin FX engine (currently on testnet). Combines Request-for-Quote execution with 24/7 on-chain settlement on Arc. Enables institutions to receive quotes from multiple liquidity providers and settle automatically.

Regulatory & Compliance

SCS Framework (Single Currency Stablecoin)

Singapore’s MAS regulatory framework for stablecoins (finalized August 15, 2023). Requires 1:1 reserve backing, monthly attestation, redemption within 5 days. Full implementation expected mid-2026. StraitsX’s XSGD and XUSD have in-principle approval.

KYC/AML (Know Your Customer / Anti-Money Laundering)

Compliance processes to verify identity and monitor for illicit activity. Required for all regulated financial services, including stablecoin on/off-ramps.

MSB (Money Services Business)

US/Canadian regulatory designation for money transmitters. Requires registration with FinCEN (US) or FINTRAC (Canada). Cybrid holds MSB registration, meaning their clients can operate in these jurisdictions without their own license.

Players & Platforms

Circle

Publicly traded stablecoin issuer and infrastructure company (NYSE: CRCL). Issues USDC. IPO June 5, 2025 at $6.8B valuation. Q3 2025: $740M revenue, $73.7B USDC circulation. Building “Economic OS for the internet” through Arc blockchain, CPN, CCTP, and StableFX.

StraitsX

Singapore-based stablecoin issuer (subsidiary of Fazz Financial Group). Issues XSGD (Singapore Dollar) and XUSD (US Dollar). Holds four MPI licenses from MAS. Combined on-chain volume: $18B+ (Dec 2025). Primary regulated on-ramp in Southeast Asia.

Xweave

Singapore-based non-custodial orchestration platform. Founded 2024, raised $3M seed (May 2025). Connects to regulated VASP partners and intelligently routes transactions. Focused on ASEAN corridors (Singapore, Philippines, UAE, Indonesia, Japan, Hong Kong).

Cybrid

Toronto-based vertically integrated orchestration platform. Founded 2021, raised $10M Series A (Oct 2025). Bundles payment orchestration, KYC/AML compliance, on/off-ramps, custody, and MSB licensing. Focused on North America.

Related Reading

• Stablecoin Payment Infrastructure 2026: What CFOs Need to Know About Arc, Tempo, and the Last-Mile Problem (link to main article)

Last updated: February 2026. This is a living document—check back as new terms emerge.