# Onchain Pay Open API

Binance Onchain Pay enables users to buy cryptocurrency with fiat (e.g., EUR, USD) or...

- Repository: https://github.com/binance/binance-skills-hub (1115 stars)
- Category: Engineering
- License: MIT
- Last updated: 2026-10-26
- Runs scripts: yes, review before use

## Install

Claude Code: `npx skills add binance/binance-skills-hub --skill onchain-pay-open-api -g -a claude-code -y`
Codex: `npx skills add binance/binance-skills-hub --skill onchain-pay-open-api -g -a codex -y`
Cursor: `npx skills add binance/binance-skills-hub --skill onchain-pay-open-api -g -a cursor -y`
Gemini CLI: `npx skills add binance/binance-skills-hub --skill onchain-pay-open-api -g -a gemini-cli -y`

## Description

Binance Onchain Pay enables users to buy cryptocurrency with fiat (e.g., EUR, USD) or send existing crypto from their Binance account directly to any external on-chain wallet address in a single flow, no manual withdrawal needed. Enables partners to integrate crypto buying services: - payment-method-list: Get available payment methods (Card, P2P, Google Pay, Apple Pay, etc.) with limits for a fiat/crypto pair - trading-pairs: List all supported fiat currencies and cryptocurrencies - estimated-quote: Get real-time price quote including exchange rate, fees, and estimated crypto amount - pre-order: Create a buy order and get redirect URL to Binance payment flow - order: Query order status and details (processing, completed, failed, etc.) - crypto-network: Get supported blockchain networks with withdraw fees and limits - p2p/trading-pairs: List P2P-specific trading pairs

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Binance Onchain-Pay Open API Skill

Call Binance Onchain-Pay Open API endpoints with automatic RSA SHA256 request signing.

## Use Cases & Scenarios

This skill is designed for the following scenarios:

### 1. 💳 Fiat-to-Crypto Purchase & Send
**When to use**: User wants to buy crypto with fiat currency and send directly to an external on-chain wallet address
- Buy USDT with USD/EUR/TWD using credit card → Send to MetaMask address on BSC
- Purchase BTC with Google Pay → Transfer to hardware wallet
- Buy USDC with P2P → Send to DeFi protocol contract address

**Key APIs**: `trading-pairs` → `payment-method-list` → `estimated-quote` → `pre-order`

### 2. 🔄 Direct Crypto Transfer (Send Primary)
**When to use**: User has crypto in Binance account and wants to send to external address
- Send existing USDT from Binance Spot to friend's wallet address
- Transfer ETH to Uniswap contract for trading
- Move crypto from Binance to self-custodial wallet (Trust Wallet, Ledger, etc.)

**Key APIs**: `pre-order` with `SEND_PRIMARY` customization

### 3. 🔗 Cross-Chain Bridge Operations
**When to use**: User needs to buy crypto on one chain and transfer to another network
- Buy USDC on Ethereum → Bridge to Polygon for lower fees
- Purchase tokens on BSC → Transfer to Base network
- Fiat to crypto on Solana → Send to Arbitrum for DeFi

**Key APIs**: `crypto-network` → `pre-order` with network selection

### 4. 🏪 Merchant Payment Integration
**When to use**: Integrate crypto payment gateway for e-commerce or services
- Accept fiat payments and auto-convert to crypto
- Enable "Pay with Crypto" checkout flow
- Process subscription payments with crypto

**Key APIs**: `pre-order` with `externalOrderId` tracking

### 5. 🤖 Smart Contract Interaction (Onchain-Pay Easy)
**When to use**: Buy crypto and execute smart contract in one transaction
- Buy USDT and deposit to lending protocol
- Purchase tokens and stake in DeFi pool
- Fiat on-ramp directly to GameFi or NFT marketplace

The rest: https://github.com/binance/binance-skills-hub/blob/HEAD/skills/binance/onchain-pay/SKILL.md