How do I install the Checkout skill?

Run npx skillmds@latest add dvcrn/checkout in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Checkout safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Checkout?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Checkout free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Checkout?

dvcrn (@dvcrn) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Checkout by dvcrn — Agent Skill

Name: Checkout
Rating: 4.5 (4 reviews)
Author: dvcrn

File contents

Credpay Checkout Skill

API Base URL: https://checkout-agent.credpay.xyz

Trigger this skill whenever the user wants to purchase, order, or checkout a product from any online store.

What you need from the user

Collect these before starting (ask if missing):

Field	Example
Product URL	`https://example.com/products/tee`
Quantity	`1`
Size / Color (if applicable)	`"Size": "M", "Color": "Black"`
Email	`customer@example.com`
Goods total (USD)	`"49.99"` — item price as a USD string, no currency symbol
Shipping address	firstName, lastName, line1, city, state, postalCode, country, phone

Step 1 — Get a quote (no payment needed)

POST https://checkout-agent.credpay.xyz/v1/quote
Content-Type: application/json

{
  "items": [
    {
      "url": "<product URL>",
      "quantity": 1,
      "options": { "Size": "M", "Color": "Black" }
    }
  ],
  "email": "<email>",
  "shippingAddress": {
    "firstName": "Jane",
    "lastName": "Doe",
    "line1": "123 Main St",
    "city": "Austin",
    "state": "TX",
    "postalCode": "78701",
    "country": "United States",
    "countryCode": "US",
    "phone": "+15125551234"
  },
  "goodsTotal": "<item price in USD as string, e.g. \"49.99\">"
}

→ Save maxAmount from the response. This is the USDC amount you will pay via x402.

Step 2 — Submit checkout (x402 payment required)

POST https://checkout-agent.credpay.xyz/v1/checkout
Content-Type: application/json
X-PAYMENT: <x402 payment payload for maxAmount on Base chainId 8453>

<same body as Step 1>

→ On 202: save requestId and go to Step 3. → On 402: re-read the payment requirements from the response and retry with a correct X-PAYMENT header.

Step 3 — Poll for completion

GET https://checkout-agent.credpay.xyz/v1/checkout/{requestId}

Poll every 5 seconds. Stop when status is completed or failed. Timeout after 10 minutes.

Status	Action
`processing`	Keep polling
`authorization_required`	See Step 4
`completed`	Done — return result to user
`failed`	Report `errorCode` + `errorMessage` to user

Step 4 — Handle extra payment (if needed)

If status is authorization_required, the order total exceeded the quoted amount:

POST https://checkout-agent.credpay.xyz/v1/checkout/{requestId}/authorize
X-PAYMENT: <x402 payment for extraOwed amount>

Then resume polling from Step 3.

Rules

Works with any online store — just pass the product page URL.
Never create a second checkout for the same intent while a requestId is active.
Retry transient network errors with exponential backoff. Never blind-retry failed status.
Default chainId is 8453 (Base).

Success response

{
  "requestId": "req_abc123",
  "status": "completed",
  "success": true,
  "orderNumber": "1234"
}

Failure response

{
  "requestId": "req_abc123",
  "status": "failed",
  "success": false,
  "errorCode": "payment_failed",
  "errorMessage": "Card declined"
}

---name: checkoutdescription: Complete online shopping purchases on any online store using the Credpay Checkout API with x402 payments. Trigger when a user wants to buy, order, or checkout a product.---# Credpay Checkout Skill**API Base URL:** `https://checkout-agent.credpay.xyz`Trigger this skill whenever the user wants to purchase, order, or checkout a product from any online store.## What you need from the userCollect these before starting (ask if missing):| Field | Example ||---|---|| Product URL | `https://example.com/products/tee` || Quantity | `1` || Size / Color (if applicable) | `"Size": "M", "Color": "Black"` || Email | `customer@example.com` || Goods total (USD) | `"49.99"` — item price as a USD string, no currency symbol || Shipping address | firstName, lastName, line1, city, state, postalCode, country, phone |## Step 1 — Get a quote (no payment needed)```httpPOST https://checkout-agent.credpay.xyz/v1/quoteContent-Type: application/json{ "items": [ { "url": "<product URL>", "quantity": 1, "options": { "Size": "M", "Color": "Black" } } ], "email": "<email>", "shippingAddress": { "firstName": "Jane", "lastName": "Doe", "line1": "123 Main St", "city": "Austin", "state": "TX", "postalCode": "78701", "country": "United States", "countryCode": "US", "phone": "+15125551234" }, "goodsTotal": "<item price in USD as string, e.g. \"49.99\">"}```→ Save `maxAmount` from the response. This is the USDC amount you will pay via x402.## Step 2 — Submit checkout (x402 payment required)```httpPOST https://checkout-agent.credpay.xyz/v1/checkoutContent-Type: application/jsonX-PAYMENT: <x402 payment payload for maxAmount on Base chainId 8453><same body as Step 1>```→ On `202`: save `requestId` and go to Step 3.→ On `402`: re-read the payment requirements from the response and retry with a correct `X-PAYMENT` header.## Step 3 — Poll for completion```httpGET https://checkout-agent.credpay.xyz/v1/checkout/{requestId}```Poll every 5 seconds. Stop when status is `completed` or `failed`. Timeout after 10 minutes.| Status | Action ||---|---|| `processing` | Keep polling || `authorization_required` | See Step 4 || `completed` | Done — return result to user || `failed` | Report `errorCode` + `errorMessage` to user |## Step 4 — Handle extra payment (if needed)If status is `authorization_required`, the order total exceeded the quoted amount:```httpPOST https://checkout-agent.credpay.xyz/v1/checkout/{requestId}/authorizeX-PAYMENT: <x402 payment for extraOwed amount>```Then resume polling from Step 3.## Rules- Works with any online store — just pass the product page URL.- Never create a second checkout for the same intent while a `requestId` is active.- Retry transient network errors with exponential backoff. Never blind-retry `failed` status.- Default `chainId` is `8453` (Base).## Success response```json{ "requestId": "req_abc123", "status": "completed", "success": true, "orderNumber": "1234"}```## Failure response```json{ "requestId": "req_abc123", "status": "failed", "success": false, "errorCode": "payment_failed", "errorMessage": "Card declined"}```

Frequently asked questions

Checkout