561 Group Market

Project Management, Course by Course

A study companion to Google’s Project Management Certificate: one chapter per course, self-checks with answers, and a guide to the capstone. Independent of Google and Coursera.

Price
$9.00 USDC per request
Network
Base mainnet, eip155:8453, settled in USDC through the Coinbase CDP facilitator
Method and URL
GET https://market.561.group/v1/publications/project-management-course-by-course
Response type
application/zip
Seller
Causeway Services (561 Group)

Input contract

{}

Example request

{
  "method": "GET",
  "url": "https://market.561.group/v1/publications/project-management-course-by-course",
  "headers": {
    "accept": "application/zip"
  }
}

Output

{
  "schema": {
    "type": "string",
    "description": "A ZIP binary containing the accepted EPUB and PDF edition."
  },
  "example": "project-management-course-by-course.zip"
}

How to buy with x402

  1. Send the request without payment. The server answers 402 Payment Required with a base64 JSON PAYMENT-REQUIRED header holding the amount, asset, network and payee.
  2. Have your wallet sign an EIP-3009 transferWithAuthorization for exactly those terms (an x402 client library does this for you).
  3. Repeat the identical request with the signed payload in the PAYMENT-SIGNATURE header.
  4. The server verifies, runs the operation, settles, and returns 200 with the result and a PAYMENT-RESPONSE header carrying the settlement receipt.

This offer is recoverable: save a random X-Payment-Recovery token before paying and repeat the same signed request with it to receive the exact purchased response again if the connection drops.

Read the price without paying

curl --include --request GET --header 'accept: application/zip' --url 'https://market.561.group/v1/publications/project-management-course-by-course'

This request authorizes nothing; it returns the live payment terms. Read the full explanation of x402.

Machine-readable