noncept/openpayment
skills/openpayment/SKILL.md
Create x402 stablecoin payment links using the OpenPayment CLI.
tools
Updated Apr 10, 2026
$ install --global
skillsauthnpx skillsauth add noncept/openpayment openpaymentInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- openpayment
- description:
- Create x402 stablecoin payment links using the OpenPayment CLI.
- homepage:
- https://openpayment.link
- metadata:
- {"openclaw": {"emoji": "💸", "requires": {"bins": ["node"]}, "install": [{"id": "node", "kind": "node", "package": "openpayment", "bins": ["openpayment"], "label": "Install OpenPayment CLI (npm)"}]}}
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>" \
[--resourceUrl "<HTTPS_URL_FOR_PROXY>"] \
--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) |
| --resourceUrl | Required when --type is PROXY; upstream API URL (https://...) |
| --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) |
| PROXY | Fixed-price multi-use payment that calls a private upstream API after successful settlement |
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"
Proxy payment link
openpayment create \
--type "PROXY" \
--price "10" \
--payTo "0xYourWalletAddress" \
--network "eip155:8453" \
--resourceUrl "https://private-api.example.com/endpoint" \
--description "Proxy payment"
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
The first time the skill runs, explain to the user what payment types and networks are allowed.
- Identify missing info you need: amount (
--price), receiver wallet address (--payTo). If--type=PROXY, also require--resourceUrl. - 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.
- PROXY without upstream URL: "Please provide the private upstream API URL for this proxy payment (
--resourceUrl)."
Validation Rules (enforced by CLI before any API call)
--type: must beSINGLE_USE,MULTI_USE,VARIABLE, orPROXY--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--resourceUrl: required only forPROXY; must be a validhttps://URL
Security Notes
Never ask for or share user private keys and secrets.
Learn More
- Website: https://openpayment.link
- GitHub: https://github.com/noncept/openpayment
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