The stablecoin primary market is direct mint and redeem with the issuer (Circle Mint for USDC, Tether Treasury for USDT, Paxos for USDP and PYUSD). Access is gated and KYB'd, settlement is typically T+0 to T+1, and the counterparty is the issuer. The secondary market is everything else: OTC desks, centralized exchanges, AMMs, and onchain inventory across chains.
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A stablecoin primary market is the issuer's own mint and redeem window. Institutions wire fiat to the issuer, the issuer mints new tokens onto a designated chain, and redemption burns tokens back to fiat. Access requires a direct issuer relationship, KYB onboarding, and an approved bank rail. It is the source of new supply.
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Circle documents this as Circle Mint, where verified business accounts can mint and redeem USDC against fiat reserves held in the Circle Reserve Fund, an SEC-registered 2a-7 government money market fund. Tether operates a comparable Treasury-side process for USDT, and Paxos runs issuance for USDP, PYUSD, and several white-label stablecoins. Each issuer publishes its own onboarding terms and minimums. Reference: Circle transparency.
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The secondary market is where existing stablecoin supply changes hands without touching the issuer. It includes OTC desks (B2C2, Cumberland, Wintermute, Galaxy), centralized exchanges (Coinbase, Binance, Kraken), AMMs (Curve, Uniswap), and bilateral onchain transfers. Pricing reflects supply and demand, inventory depth, and chain location rather than reserve backing alone.
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Secondary venues quote two-way markets. They earn the spread, manage inventory across chains, and rebalance through their own primary access or through cross-venue arbitrage. For most institutional flow under roughly $25M (illustrative), an OTC desk or large exchange will fill faster than waiting on a primary mint, because the inventory already exists. Reference: Federal Reserve FEDS Notes on the stablecoin landscape.
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Institutions go primary when size, price certainty, or chain placement matters more than speed: large block creation, redemption to fiat, or minting directly onto a non-default chain. They go secondary when speed and execution flexibility matter more than reserve-direct settlement: same-day rebalancing, multi-chain inventory, or any size a desk can absorb without moving the market.
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The decision is rarely binary. A treasury operation might mint $50M via Circle Mint at the start of a campaign and then top up the remaining flow through OTC desks during the week. The trade-off set is cost, speed, chain destination, and counterparty exposure. See the worked example below for the per-leg mechanics.
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Primary trades carry no spread but require bank-rail settlement (ACH, Fedwire, SWIFT) and an active issuer relationship. Secondary trades carry a bid-ask spread but settle in minutes onchain or instantly on a centralized venue. Access cuts the other way: primary access is restrictive, secondary access is broad. The right venue depends on which constraint binds.
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Three variables dominate the choice. First, size: a $5M secondary fill barely moves a major desk's quote, while a $500M primary mint avoids any spread pickup. Second, destination chain: primary mints land on a single chain the issuer supports, while secondary lets a buyer source inventory wherever it already sits. Third, urgency: secondary clears in minutes, primary clears in hours. Reference: BIS Working Paper No. 1270 on stablecoin market structure.
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Below is an illustrative walkthrough of a $100M USDC treasury allocation. The institution needs the position split across Ethereum, Base, and Solana within one business day. The table breaks the flow into legs, each with a venue, a counterparty, an indicative cost, and an indicative settlement window. Every figure is illustrative and is not sourced pricing.

What the table shows: the primary leg anchors the largest, cheapest tranche; secondary legs solve for chain placement and speed; a cross-chain orchestration leg avoids redundant primary mints across three chains. The institution touches one issuer relationship and several execution venues, but reconciles to a single position. For deeper background on issuer mechanics, see /support/en/articles/15593207.
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A primary-plus-secondary flow can involve up to five distinct counterparty types: the stablecoin issuer, a custodian holding the institution's tokens, an OTC desk providing inventory, an onchain orchestration layer routing across chains, and the exchange or AMM venues used for residual fills. Each adds a separate risk and operational surface.
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Institutions typically separate custody from execution. Custodians such as Fireblocks and Anchorage hold the tokens and sign transactions; OTC desks and orchestrators handle the execution. This separation is the dominant institutional pattern and is covered in detail at /support/en/articles/15593209. Reference: BIS CPMI report on stablecoin arrangements.
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Eco operates as a neutral orchestration layer across the stablecoin market. It does not take principal risk and does not act as a market maker. For institutions running a mixed primary and secondary flow, Eco's role is the routing and best-execution surface that sits between issuers, OTC inventory, and onchain venues, allowing one integration to address many markets.
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Practically, that means an institution can mint primary supply with its existing issuer relationship, then route the remaining secondary legs across chains and venues through a single integration rather than maintaining bespoke connections to every desk and chain. The primary relationship stays with the issuer. The secondary relationships consolidate.
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See also: BVNK and the Payments Layer Mastercard Acquired, on how Mastercard's BVNK acquisition reshapes the apps and payments layer.