Is an on-ramp always a payin?

Not always. A payin is any deposit into a payment system. An on-ramp specifically turns fiat into stablecoins. A bank deposit that is converted to USDC is both. A card payment that only credits a fiat balance is a payin but not an on-ramp. In BlindPay's docs, a payin is the on-ramp.

What are POBO and COBO?

POBO means payment on behalf of: you pay a supplier for an obligation that belongs to your customer. COBO means collection on behalf of: you collect a payment that belongs to your customer. At BlindPay both depend on the customer being onboarded and holding a virtual account in their own name.

What does pre-funding mean in stablecoin payments?

Pre-funding means holding money or stablecoins in advance so a payment can be sent right away. A payout provider that needs pre-funding asks you to top up a balance before each payout. A quote-based provider can instead lock a rate and take funds when you execute. Ask which model a vendor uses.

Do I need both payins and payouts?

Only if money moves both ways in your product. A platform that collects from customers and keeps stablecoins needs payins. A company that pays suppliers or creators from a stablecoin balance needs payouts. A marketplace, remittance app, or neobank usually needs both, so the same balance can receive and send.

What is the difference between an off-ramp and a payout?

An off-ramp is the conversion from stablecoins to local currency. A payout is the full transfer to a recipient's bank account, which includes that conversion plus the bank send and tracking. Most vendors use the two words for the same product. Check whether the price covers only the conversion or the whole delivery.

Which term should I use when I talk to a vendor?

Describe what the money does, then use their word. Say, for example, that your customer pays by ACH and you want USDC in a wallet. That is clearer than saying on-ramp or payin. Then ask which API objects, quotes, and webhooks the vendor uses for that step.

Payin vs payout vs on-ramp vs off-ramp explained

A payin is a deposit, a payout is a withdrawal to a bank account, an on-ramp turns fiat money into stablecoins, and an off-ramp turns stablecoins back into fiat. A payin is usually an on-ramp. A payout is usually an off-ramp. BlindPay uses the same words in its API.

Key takeaways

Payin and payout describe the direction of money for your product. On-ramp and off-ramp describe the currency conversion.
Most stablecoin payins are on-ramps, and most stablecoin payouts are off-ramps. The pairs are not strictly identical.
BlindPay frames its product as Store, Receive, and Send.
Vendors use different words for the same step, so describe the money movement before you compare quotes.
Terms like POBO, COBO, and pre-funding change who carries risk. Ask about them early.

For the full overview of the payin side, start with what a stablecoin payin API is.

What is a payin?

A payin is money coming into your system from a payer. The payer might send an ACH transfer, a wire, a Pix payment in Brazil, or a card payment. In a stablecoin product, the provider then converts that deposit and delivers a stablecoin such as USDC to a wallet.

BlindPay's docs call a payin its on-ramp: fiat comes in from a sender, and stablecoins go out to a wallet. A payin starts with a quote that locks the amount, fee split, and destination for 5 minutes. See Payins for the flow.

What is a payout?

A payout is money going out of your system to a recipient's bank account. The provider takes stablecoins from your funding source, converts them to local currency, and sends the money over a bank rail such as ACH, wire, Pix, or SPEI (Mexico's instant payment system).

A payout needs a recipient's bank details, a quote, and an execution step. The off-ramp side is covered in what a stablecoin off-ramp is.

What are on-ramps and off-ramps?

An on-ramp converts fiat to a stablecoin. An off-ramp converts a stablecoin to fiat. A stablecoin is a digital token built to hold a steady value, such as one US dollar. The "ramp" is the bridge between the bank world and the blockchain world.

	Payin	Payout	On-ramp	Off-ramp
Direction	Money in	Money out	Fiat to stablecoin	Stablecoin to fiat
Focus	Your product's flow	Your product's flow	The conversion	The conversion
Usual pair	On-ramp	Off-ramp	Payin	Payout
Example	Customer pays by ACH	You pay a supplier by Pix	USD becomes USDC	USDC becomes BRL

The overlap is where confusion starts. A payin that credits a fiat balance with no conversion is not an on-ramp. A stablecoin transfer between two wallets is neither a payin nor a payout. For a broader primer, read what a crypto on-ramp and off-ramp are.

Which term should I use when I talk to vendors?

Describe the money movement first, then ask for the vendor's word. Vendors use "deposit," "collection," "funding," or "on-ramp" for the same payin step. They use "withdrawal," "disbursement," "settlement," or "off-ramp" for the payout step.

Try this short script on a call:

State the payer, the rail, and the currency: "Our customer pays by ACH in USD."
State the destination: "We want USDC in a wallet our customer controls."
Ask for the objects: "Which API call creates the deposit instructions, and which webhook tells us it landed?"
Ask who handles compliance for the payer.

If you are comparing vendors, use how to choose an on/off ramp provider.

What are Store, Receive, and Send?

Store, Receive, and Send are the three sections of BlindPay's product. Receive is a bank-transfer payin, a fiat-to-stablecoin on-ramp. Store is where the value sits. Send is where it leaves, as a payout to a bank account or as a stablecoin transfer.

BlindPay section	Plain payment words	Crypto words	Docs
Receive	Collect a deposit from a payer	Payin, on-ramp	Payins
Store	Hold a customer balance	Wallet	Store
Send	Pay a recipient's bank account	Payout, off-ramp	See the Payouts docs

Store has two wallet options. An external blockchain wallet (bw_...) is controlled by the customer. A managed wallet (bl_...) is BlindPay-custodied and in beta. The docs also describe Send as moving stablecoins out of a managed wallet to another wallet. That is a transfer, with no fiat leg.

What other terms will I see?

You will see a dozen more terms in vendor decks. Use this glossary as a reference. The blockchain payments glossary has more.

Term	Plain-English meaning
Virtual account	A dedicated bank account number issued for one customer. Deposits are matched to that customer and converted automatically.
Quote	A locked price for a payment: amount, rate, and fees. At BlindPay, payin and payout quotes expire after 5 minutes.
KYC	Know your customer. Identity checks for an individual.
KYB	Know your business. Identity and ownership checks for a company.
Travel Rule	A rule that requires sender and recipient information to travel with certain transfers between regulated firms.
Settlement	The point where money is final and cannot be pulled back by the sender.
Pre-funding	Holding money or stablecoins in advance so a payment can be sent immediately.
POBO	Payment on behalf of. You pay for your customer's obligation.
COBO	Collection on behalf of. You collect money that belongs to your customer.
Wallet	An address on a blockchain that holds tokens.
Network (chain)	The blockchain where a token moves, such as Ethereum or Solana.
Memo code	A reference the payer includes so the deposit can be matched to a payin.
Webhook	An automatic HTTP message that tells your system a payment changed state.
Partner fee	A fee you add on top of the provider's fee for your own revenue.

POBO and COBO need care. BlindPay supports them only when the customer is onboarded, passed KYC or KYB, and holds a virtual account in their own name. Moving money for a party BlindPay cannot see is nesting, and it is not allowed. See POBO and COBO and the SWIFT POBO vs COBO guide.

Pre-funding is a cash-flow question. If you pay out from a stablecoin balance, you need that balance in place before a payout runs.

Do I need a payin, a payout, or both?

Match your business situation to the table. Choose the column that fits where money starts and where it ends.

Business situation	Payin	Payout	Both
Collect USD from customers and keep stablecoins	Yes
Pay freelancers or suppliers abroad from a balance		Yes
Marketplace that collects from buyers and pays sellers			Yes
Neobank that funds balances from bank deposits and sends transfers			Yes
Exporter that bills customers abroad and wants dollars in a wallet	Yes
Payroll product that funds from local currency and pays in another			Yes
Treasury that moves stablecoins between its own wallets	Neither: a stablecoin transfer

For a deeper decision, see on-ramp, off-ramp, or both.

Where does BlindPay fit?

BlindPay offers payins (Receive), wallets (Store), and payouts and transfers (Send) in one API. These facts come from the BlindPay docs.

Payin methods are ACH, wire, RTP, international SWIFT, Pix, TED, SPEI, Transfers, PSE, Bre-B, card, and ACH pull.
Payins can deliver to a customer-controlled external wallet or to a BlindPay-managed wallet, which is BlindPay-custodied and in beta.
A virtual account gives a customer a dedicated deposit account. Each deposit creates a payin. See the virtual accounts page.
BlindPay charges a monthly plan plus per-transaction fees, shown in the live quote. See pricing.

Sources

BlindPay docs, Payins, Store, and POBO and COBO
FATF, Recommendation 16 and virtual asset guidance
Federal Reserve Financial Services, FedACH and Fedwire overview
Banco Central do Brasil, Pix

This article is for general information only and is not legal, tax, or financial advice.

Payin vs payout vs on-ramp vs off-ramp: stablecoin payment terms explained