modbender OpenPayment Skill
Creates x402 stablecoin payment links via the openpayment CLI.
All links are hosted at OpenPayment and settle in USDC on Base.
Use this skill whenever a user wants to create a payment link, request a stablecoin payment, set up a crypto payment, generate a USDC payment URL, or mentions x402, OpenPayment, or wants to get paid in crypto/stablecoins on Base. Trigger even if the user says things like "create a payment link", "I want to accept USDC", "generate a crypto payment request", "send me money in stablecoins", or "set up a blockchain payment".
About OpenPayment
OpenPayment lets merchants, creators, developers, and AI agents accept USDC payments with shareable payment links and APIs. 0% platform fees, instant settlement to recipient wallet, and no sign-up required. Powered by x402.
Install
npm i -g openpayment
Core Command
openpayment create \
--type "<PAYMENT_TYPE>" \
--price "<AMOUNT>" \
--payTo "<EVM_ADDRESS>" \
--network "<NETWORK>" \
--description "<DESCRIPTION>"
Required Flags
| Flag | Description | Example |
|---|---|---|
--type |
Payment type (see below) | SINGLE_USE |
--price |
Amount in human-readable USDC | 10 or 0.001 |
--payTo |
Recipient EVM wallet address | 0x1234...abcd |
--network |
CAIP-2 network identifier | eip155:8453 |
Optional Flags
| Flag | Description |
|---|---|
--description |
Payment description (max 500 chars) |
--json |
Output as JSON instead of plain text |
Payment Types
| Type | When to use |
|---|---|
SINGLE_USE |
One-time payment with fixed price (e.g., a specific order, invoice) |
MULTI_USE |
Fixed price, can be paid multiple times (e.g., recurring product) |
VARIABLE |
Reusable link; payer chooses amount per payment (e.g., tips, donations) |
Default to SINGLE_USE unless the user specifies otherwise.
Networks
| Network | Flag value | Description |
|---|---|---|
| Base Mainnet | eip155:8453 |
Production, real USDC |
| Base Sepolia | eip155:84532 |
Testnet, test USDC |
Default to eip155:8453 (Base Mainnet) unless the user says "test", "testnet", or "sepolia".
Support for other networks will be added soon.
Currency
The default currency is USDC.
- Base Mainnet USDC:
0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 - Base Sepolia USDC:
0x036CbD53842c5426634e7929541eC2318f3dCF7e
Support for other stablecoins and custom ERC-20 tokens will be added soon.
Example Commands
Basic single-use payment link (10 USDC on Base)
openpayment create \
--type "SINGLE_USE" \
--price "10" \
--payTo "0xYourWalletAddress" \
--network "eip155:8453" \
--description "Payment for order #123"
Crowdfund / donation (multi-use, suggest 1 USDC, user can change)
openpayment create \
--type "VARIABLE" \
--price "1" \
--payTo "0xYourWalletAddress" \
--network "eip155:8453" \
--description "Support my work"
Recurring subscription (multi-use, fixed price)
openpayment create \
--type "MULTI_USE" \
--price "9.99" \
--payTo "0xYourWalletAddress" \
--network "eip155:8453" \
--description "Monthly subscription"
Testnet payment link
openpayment create \
--type "SINGLE_USE" \
--price "5" \
--payTo "0xYourWalletAddress" \
--network "eip155:84532" \
--description "Test payment"
JSON output (for scripting)
openpayment create \
--type "SINGLE_USE" \
--price "25" \
--payTo "0xYourWalletAddress" \
--network "eip155:8453" \
--json
Output
Plain text:
Payment created successfully
paymentId: <paymentId>
url: <paymentUrl>
Example:
Payment created successfully
paymentId: ed5b8e83-607b-4853-90c6-f4f3ba821424
url: https://openpayment.link/pay/?paymentId=ed5b8e83-607b-4853-90c6-f4f3ba821424
JSON (--json):
{
"paymentId": "<paymentId>",
"url": "<paymentUrl>"
}
Example:
{
"paymentId": "ed5b8e83-607b-4853-90c6-f4f3ba821424",
"url": "https://openpayment.link/pay/?paymentId=ed5b8e83-607b-4853-90c6-f4f3ba821424"
}
Workflow for Handling User Requests
- Identify missing info you need: amount (
--price), receiver wallet address (--payTo). Ask if not provided. - Infer defaults: type defaults to
SINGLE_USE, network defaults toeip155:8453(Base Mainnet). - Confirm info with the user before creating.
- Run the command using the bash tool.
- Present the payment URL clearly to the user so they can share it.
What to ask if info is missing
- No wallet address: "What's the recipient EVM wallet address (starting with 0x)?"
- No amount: "How much USDC should the payment be for?"
- No type specified but context suggests multi-use: "Should this link be single-use (one payment only) or reusable?", "Should the amount be fixed or editable?"
- No network specified: assume Base Mainnet; mention it in your response.
Validation Rules (enforced by CLI before any API call)
--type: must beSINGLE_USE,MULTI_USE, orVARIABLE--price: positive decimal number (e.g.0.001,10,99.99)--payTo: valid EVM address —0xfollowed by 40 hex characters--network: must beeip155:8453oreip155:84532--description: optional string, max 500 characters
Security Notes
Never ask for or share user private keys and secrets.
Learn More
- Website: https://openpayment.link
- GitHub: https://github.com/noncept/openpayment