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Fin provides payment infrastructure that lets platforms accept crypto deposits from multiple sources (exchange wallets, external wallets, and more) with built-in fee handling, token conversion, and multi-chain delivery. This feature is only given upon Fin’s compliance due diligence. Three APIs power the entire flow: Quote Estimation, Create Order, and Get Payment Details.

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Payment Sources

Fin currently supports three deposit sources, with more on the way.

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Use Cases

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1. Prediction Market Deposits

A prediction market platform wants to let users deposit funds directly from their exchange accounts or external wallets. What the user does:
  • Opens the deposit flow on the platform
  • Selects Bybit Pay, Kraken Pay, or pays from an external wallet
  • Confirms the transaction
What happens under the hood:
  1. Platform calls the Quote Estimation API to get the conversion rate and fees for the deposit amount.
  2. User confirms. Platform calls the Create Order API to initiate the transaction.
  3. For exchange pay (Bybit/Kraken): user scans a QR code to authorize payment from their exchange account. For external wallets: user sends to a provided deposit address.
  4. Fin receives the funds, deducts the platform fee, and credits the destination wallet.
  5. Platform calls Get Payment Details API to confirm settlement and update the user’s balance.
Supported tokens and chains:
  • Pay with USDC → receive USDC on Solana, Base, or Ethereum
  • Pay with USDC → receive USDC on Polygon
  • Additional tokens and chains can be added based on platform requirements

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2. Multi-Chain Wallet Top-Ups

A platform wants to let users top up their account balance with a range of tokens across different chains. What the user does:
  • Initiates a deposit on the platform
  • Chooses their preferred token and payment method
  • Sends funds from any external wallet
What happens under the hood:
  1. Quote Estimation API returns the rate, fee, and expected delivery amount for the selected token pair.
  2. Create Order API generates the deposit address or QR code.
  3. User sends funds. Fin receives the deposit, handles any conversion, deducts the fee, and delivers to the destination wallet.
  4. Get Payment Details API confirms the transaction status.
Supported tokens and chains:
  • Bitcoin on the Bitcoin network
  • ETH on Ethereum
  • USDT on Tron
  • USDC on Solana, Base, Ethereum

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3. Cross-Token Deposits

A platform accepts a specific token (e.g., PYUSD), but users hold a different token (e.g., USDT on Bybit). What the user does:
  • Initiates a deposit
  • Pays with USDT from Bybit Pay
  • Receives PYUSD in their platform wallet
What happens under the hood:
  1. Quote Estimation API returns the USDT → PYUSD conversion rate and fees.
  2. Create Order API initiates the order and generates the Bybit Pay QR code.
  3. User scans the QR code. USDT is deducted from their Bybit Pay account.
  4. Fin converts USDT to PYUSD, deducts the fee, and deposits PYUSD into the user’s platform wallet.
  5. Get Payment Details API confirms delivery.
Key point: The user pays in whatever token they hold. The platform receives exactly the token it needs. Fin handles the conversion in between.

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API Overview

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Supported Assets

This is not an exhaustive list. Fin can add support for additional tokens and chains based on platform requirements.

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How Fees Work

Fin deducts a platform-defined fee from each transaction before delivering funds to the destination wallet. The fee is surfaced to the user upfront via the Quote Estimation API, with no hidden costs.

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Integration Flow for receiving payments