Onchain Pay Open Api
This is Binance's fiat-to-crypto onramp API with automatic RSA SHA256 request signing built in. You can let users buy crypto with credit cards, Google Pay, or P2P and send it directly to an external wallet address without manual withdrawals. The interesting bit is the ON_CHAIN_PROXY_MODE that lets you buy and execute a smart contract call in one flow, so you could theoretically go from fiat to staked-in-DeFi without touching a CEX interface. The skill handles all the signing complexity through a bash script, though you'll need your own Binance merchant credentials and PEM key. Eight endpoints cover everything from payment method discovery to order tracking across multiple chains.
- skills.sh installs
- 6K
- GitHub stars
- 1.2K
- last updated
- Aug 21, 2026
Install
$ npx -y skills add binance/binance-skills-hub --skill onchain-pay-open-api --agent claude-codeInstalls into .claude/skills of the current project.
Files
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
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- Repository
- github.com/binance/binance-skills-hub
- Categories
- Backend & APIs, Finance & Trading, Web3 & Blockchain
- First seen
- Apr 16, 2026
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