A Pay-In is when funds are sent from a payer to a merchant’s Orbital account. Pay-Ins allow you to accept cryptocurrency deposits from customers, partners, or other external sources, and either settle them in the same currency or automatically convert to a supported fiat currency before settlement.

How the Pay-Ins API Works

The general flow for processing a Pay-In is as follows:

Create a deposit request using one of the available Pay-In methods.
Orbital generates either a wallet address or a payment page/invoice link.
The payer sends funds to the provided address.
Orbital monitors the blockchain and sends a webhook notification when a valid deposit is detected.
Your system updates the transaction record and credits the user once payment status is confirmed.

Pay-In Integration Methods

Orbital offers five Pay-In methods, each designed for different integration styles, user experiences, and operational needs.

Method	Description	Best For	Implementation Notes
Rapid Deposit	Generates a reusable deposit address via API for a specific currency/network.	Wallet apps, exchanges, gaming platforms, or services with regular top-ups.	No expiry; merchant must store and map addresses to the correct users.
Hosted Payment Page (HPP)	Redirects users to Orbital’s fully hosted deposit page where wallet selection, QR code display, and transaction tracking are handled by us.	Merchants wanting to go live quickly with minimal development effort.	Invoice link expires after 15 minutes; limited UI customisation.
Embedded Payment Page (EPP)	Embeds our hosted flow directly into your site via a JS widget, so customers complete deposits without leaving your platform.	Platforms that want an improved UX over redirects without building a full UI.	Invoice link expires after 15 minutes; requires JS widget configuration.
Self-Hosted Invoice UI	Uses Orbital’s API to generate invoice data and build your own frontend for wallet/QR display and payment handling.	Businesses with complex UX, KYC flows, or strict branding requirements.	Invoice link expires after 15 minutes; full frontend development required.
Receive-by-Link (RBL)	Manually creates and sends a one-off hosted invoice link from the Client Portal. No API integration.	VIP, private client, or concierge-style payment flows.	Invoice link expires after 15 minutes; no API support or automation.

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Compliance Reminder Travel Rule data must be included for applicable transactions or the payment will be blocked until the required information is provided.

Minimum Pay-In Amounts

To ensure successful processing, all Pay-Ins must meet the minimum amounts listed below. These thresholds are in place to cover network fees and ensure the transaction is accepted by the blockchain. Any Pay-In received for an amount below the required minimum may not be credited automatically and could require manual intervention to recover.

Currency	Minimum Amount
BTC	0.00001
ETH	0.0001
BCH	0.001
LTC	0.001
USDT	1
USDC	1
BUSD	1
TST	0.1
TETH	0.0001

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For stablecoins like USDT, USDC, and BUSD, the minimum amount typically refers to the stablecoin's value (e.g., 1 USDT ≈ 1 USD). Actual network fees and specific chain requirements (e.g., ERC-20, TRC-20) might influence the absolute smallest transferable amount.

Integration Considerations

Webhooks are required for real-time payment status updates. Avoid relying solely on API polling.
Travel Rule compliance may apply, depending on the payer’s location, transaction value, and your account’s regulated entity (PPOU or PPDL). See Travel Rule Compliance.
Reporting APIs can be used to reconcile Pay-Ins, verify credited amounts, and track incoming transactions.
Invoice expiry applies to some methods (HPP, EPP, Self-Hosted Invoice UI, RBL). Rapid Deposit addresses do not expire.