The USDC payment gateway for regulated commerce

Why accept USDC

USDC is the dollar stablecoin built for a defensible compliance posture. It's the second-largest by supply, and the one businesses reach for when an auditor will ask about it . Where USDT owns the broadest retail adoption, USDC owns the institutional and US-regulated end: financial-services firms, fintech startups, SaaS companies billing US customers, and any team that prefers an asset it can describe without footnotes.

Paymos accepts USDC on ten networks. You point an invoice at USDC, the customer picks where to send from, and the funds land on your balance with full webhook notification. Settlement is one-to-one — USDC in, USDC out, no silent conversions.

This page covers USDC specifically: who issues it, what backs it, how it differs from USDT and DAI in practice, and what merchants should plan for when accepting it.

What USDC actually is

USDC is issued by Circle Internet Financial, a US-incorporated public company listed on the NYSE under CRCL since its June 2025 IPO . Each USDC is backed one-to-one by dollar reserves held in the Circle Reserve Fund — short-duration US Treasuries, overnight Treasury repos, and cash, managed by BlackRock and custodied at BNY Mellon . The balance sits as cash deposits at regulated US banks.

A few things that distinguish USDC from other stablecoins from a merchant's perspective:

• Monthly attestations, not just quarterly. Circle publishes monthly reserve attestations from Deloitte, its independent auditor . Each one sets total USDC in circulation against the dollar reserves backing it — a tighter cadence than the quarterly reports most issuers run.
• Direct redemption available to verified accounts. Unlike USDT's institutional-only redemption, Circle Mint accounts (KYC required, but available to businesses, not just $100k+ institutional clients) can redeem USDC for USD on a same-day basis.
• Issued by a regulated US entity. Circle holds money transmitter licenses across most US states plus DC and Puerto Rico, an EMI license in France under MiCA, and a major payment institution licence in Singapore . That regulatory footprint is the central reason regulated industries pick USDC over USDT.
• Segregated, bankruptcy-remote reserves. Circle holds the reserve assets apart from its own operating funds, for the benefit of USDC holders . They sit off Circle's own balance sheet rather than as a corporate liability — Circle's stated position is that holders are protected if the company itself fails.

The trade-off is that USDC also has more aggressive compliance enforcement than USDT. Circle freezes addresses promptly when asked by US law enforcement, OFAC, or court orders. The freeze list is public and includes Tornado Cash-associated addresses (frozen in 2022 within hours of the OFAC designation) and a long list of sanctions-related entities.

Networks where USDC lives on Paymos

Circle deploys USDC natively on every Ethereum-family chain that matters and on several non-EVM chains (Solana, NEAR, Sui, plus Stellar, Algorand, and Hedera, which Paymos does not target). The ten we support carry essentially all merchant-facing USDC volume. Where the token standard or decimals differ, it changes how the asset behaves — so here is each network with its specifics:

Network	Token standard	Decimals	Typical sender fee	Best for
Ethereum	ERC20	6	a couple of cents in ETH	Enterprise, B2B, treasury flows
Base	ERC20 (L2)	6	sub-cent in ETH	Coinbase-native users, fintech
Arbitrum	ERC20 (L2)	6	sub-cent in ETH	DeFi, mid-size B2B
Optimism	ERC20 (L2)	6	sub-cent in ETH	Same as Arbitrum
Polygon	ERC20 (PoS)	6	sub-cent in POL	Micro-payments, retail e-commerce
BSC	BEP20	18 (bridged)	under $0.01 in BNB	Asian markets, Binance-native
Avalanche	C-Chain ERC20	6	a few cents in AVAX	DeFi, institutional treasury
Solana	SPL token	6	fractions of a cent in SOL	High-frequency US retail checkout
NEAR	NEP-141	6	fractions of a cent in NEAR	Web3 apps, low-cost settlement
Sui	Native	6	fractions of a cent in SUI	Move-chain apps, retail

Two practical notes:

• USDC on Tron does not exist on Paymos. Circle never officially deployed USDC on Tron. Anything labeled "USDC TRC20" in the wild is a bridge wrapper from a third party — not Circle-issued, not redeemable at Circle. We don't accept those because the redemption story is different and the compliance posture is unclear.
• BSC USDC is the Binance-bridged variant with 18 decimals (Circle has not deployed native USDC on BSC; the asset reaches BSC via Binance Bridge holding Ethereum-native USDC in escrow). Other chain deployments use 6 decimals natively. Paymos handles the decimal normalization in the balance API.

Which USDC network should you use first

Most US/EU regulated merchants default to Ethereum L1 + Base as the supported pair. Ethereum because B2B counterparties already operate there for treasury flows; Base because it's Coinbase's L2 and Coinbase is where most US retail users self-custody.

For e-commerce specifically, Polygon, Solana, or Sui are the practical choices — fractions-of-a-cent network fees, quick settlement, and good wallet support.

BSC USDC is worth enabling if you have Asian customers — many Binance withdrawals go to BSC by default and customers find it cheaper than ERC20.

Solana USDC is increasingly the default for high-frequency US retail flows — fractions of a cent in network fees, and Phantom + Solflare have become mainstream consumer wallets.

USDC vs USDT in practice

The two dominate the stablecoin market but serve different needs. A short comparison from a merchant perspective:

Dimension	USDT	USDC
Issuer	Tether Limited (BVI/HK)	Circle Internet Financial (US, public)
Reserves	T-bills + cash + secured loans + gold + BTC	T-bills + cash only
Attestations	Quarterly (BDO Italia)	Monthly (Deloitte)
Direct redemption	Institutional only, $100k+	Circle Mint accounts, KYC required
Regulatory status	Limited US oversight	US MTLs across most states + DC, MiCA EMI in France
Network coverage	11 networks on Paymos (incl. Tron, TON)	10 networks on Paymos (no Tron, no TON, no Plasma)
Daily volume	~3-5x higher than USDC	Second-place but rapidly closing
Freeze enforcement	Targeted, ~2k+ addresses	Aggressive, including DeFi protocols (Tornado Cash)
Best fit for	Global retail, CIS, Asia, gambling/forex	US/EU regulated, fintech, SaaS, B2B

A sensible pairing is USDT for breadth + USDC for compliance and US enterprise. Enable both in your project; the customer picks at checkout.

Pricing and integration

USDC settles at the same 1.0% all-in standard rate as every token on Paymos ; the sweep and settlement cost is absorbed inside that one fee. Because USDC runs on cheap chains — Base, Polygon, Solana, the L2s — the customer's inbound gas is a fraction of a cent to a couple of cents, well below an ERC20-only setup . High-volume merchants can negotiate a 0.3% Enterprise rate on request . Full breakdown: pricing page.

Integration: pass currency: "USDC" to POST /v1/invoices and optionally network: "ERC20" (or BASE, POLYGON, ARBITRUM, OPTIMISM, BEP20, AVALANCHE, SOLANA, NEAR, SUI) to lock the chain. Leave the network off and the customer picks at checkout from the set you enabled — handy when you accept USDC across several chains at once. The widget SDK takes a fiat currency field and surfaces USDC among the tokens you've turned on. Request schema and copy-paste samples across eight languages live in the API docs.

For a no-code path, the WooCommerce, WHMCS, and OpenCart 4 plugins each expose USDC as a checkout option once you tick it in the gateway settings — it lines up next to the other tokens you accept.

One USDC balance, settle on any network

You receive USDC as USDC — no silent bridging, no auto-conversion to another coin or to fiat. What you don't get is a balance fragmented per chain. USDC paid on Polygon, on Base, on Solana all aggregate into one USDC balance: a single amount, not a separate pot per network .

You choose the chain at withdrawal, not before. Pull the whole USDC balance out on any network where USDC is issued — including a different one from where it came in, since Paymos settles across networks underneath . The contrast with gateways that auto-convert at hidden rates is deliberate: you decide where your USDC lands, not us.

USDC-specific edge cases

Circle-issued vs bridged USDC on BSC

The USDC on Binance Smart Chain at the contract address 0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d is bridged via Binance Bridge, backed by Circle USDC held in escrow on Ethereum — Circle has not deployed native USDC on BSC. It uses 18 decimals (BEP20 default), where every other USDC deployment uses 6. The peg holds, but the redemption story differs (you'd need to bridge back through Binance to reach Circle redemption). Paymos handles this transparently — your balance is correctly normalized in the API regardless of the chain.

Circle's freeze policy is more aggressive than Tether's

In August 2022, Circle froze 38 Ethereum addresses tied to Tornado Cash within hours of OFAC's sanctions designation . Tether's response to comparable cases has historically been slower and more selective.

The implication is for a specific kind of merchant. If your customers operate in regulatory grey zones — privacy-focused users, certain DeFi protocols — USDC may not be your primary stablecoin. USDT is more permissive, and this is one of the few places where it's the safer operational choice.

Reserve banking is the real USDC risk

USDC's peg depends less on its asset mix than on where the cash sits. The March 2023 SVB episode (covered in the FAQ below) made the point: a single failed banking partner briefly broke the dollar peg . The practical takeaway for a merchant holding a large balance is to watch Circle's banking disclosures, not just the headline reserve total. Withdraw to your own wallet on a cadence that matches your risk appetite, the same as you would with any single-issuer balance.

See also

USDC pairs naturally with USDT (for broader retail reach across Tron, TON, and Plasma) and USD1 (for World Liberty-aligned audiences). For DeFi-leaning audiences, DAI is the decentralized counterpart. For gold-settled invoices, see XAUT. Most US/EU merchants enable USDC + USDT as the starting set.

Frequently asked questions

Is USDC the right primary stablecoin for US-regulated commerce?

For most US-regulated businesses, yes. Circle is a publicly traded US issuer, holds money transmitter licenses, and publishes monthly Deloitte attestations . That regulatory paper trail is what an auditor or banking partner wants to see, and it's the central reason fintech and SaaS firms billing US customers pick USDC first. The exception is a customer base operating where US/EU sanctions don't match your market: Tether freezes addresses less aggressively, so USDT can fit that case better. Pick on where your customers sit and what your compliance counsel advises.

Can a customer pay me USDC from Binance?

Yes. Most Binance USDC withdrawals default to BSC (BEP20), Polygon, or Solana — all three are supported on Paymos. The customer picks the network at checkout and pulls from Binance with the matching network selected. Withdrawals to ERC20 from Binance work too but typically cost more in network fees.

Does Circle pay interest on USDC reserves to merchants?

No. The yield on USDC reserves (currently several percent annually on the Treasury holdings) accrues entirely to Circle. Holders of USDC receive no yield — that's a structural choice that distinguishes stablecoins from money market funds. If you want yield on your stablecoin balance, you'd need to move it into a yield-bearing protocol or product (Aave, Compound, Coinbase USDC rewards) — but that's separate from Paymos and introduces additional risk.

What happens if Circle freezes my deposit address?

If Circle issues a blacklist call against an address holding your USDC, those funds become permanently immobilized on that network's USDC contract. They cannot be transferred, swept, or refunded. Because Paymos derives a fresh deposit address per invoice and never reuses one , a contract-level freeze can only touch the coins that landed on that single address — your swept balance and every other invoice stay clear. The realistic scenario is extremely rare for ordinary merchants: Circle's freezes have so far tracked OFAC designations or court orders, not commercial activity.

Why doesn't Paymos support USDC on Tron?

Because Circle never deployed it there . Anything labelled "USDC TRC20" is a third-party bridge wrapper, not the Circle asset, and it can't be redeemed at Circle. We don't accept wrappers, since buyers and merchants both expect them to behave like native USDC and they don't. If you want a low-cost, high-throughput USDC chain instead, Solana, Polygon, or Base each fit that role — all Circle-native and live on Paymos.

What did the March 2023 SVB depeg mean for merchants?

Over a long weekend (10-13 March 2023), USDC traded as low as $0.88 because $3.3B of Circle's reserves were trapped at the failing Silicon Valley Bank . A merchant who held a USDC balance and tried to convert to USD via an exchange that weekend would have realized a loss. The peg restored within 48-72 hours after the FDIC fully guaranteed SVB deposits. The episode pushed Circle to diversify its banking relationships, but the structural risk — reserves at a single banking partner — is still worth monitoring.

Does Circle's MiCA EMI license affect USDC acceptance in the EU?

Yes — positively. Circle's French EMI license under MiCA makes USDC one of the small number of stablecoins explicitly permitted for use in EU payment contexts. If your business operates in the EU and you've been watching MiCA enforcement against non-compliant tokens, USDC is on the compliant side. For EU-merchant flows you can also accept fiat-priced invoices in EUR; Paymos locks the USDC exchange rate at the moment the customer selects their token.

How does USDC settlement compare to ACH for US businesses?

USDC clears in a few minutes on Ethereum, under a minute on the L2s. ACH settles in 1-3 business days. The practical implication for SaaS billing or B2B invoicing: USDC gives you same-minute finality where ACH gives you next-business-day finality. Most US merchants who adopt USDC do it for this reason, not for the lower processing fee.