561 Group Market

YAML Syntax and Alias Diagnostics

Validate YAML syntax and anchor references; YAML 1.2 by default, with declared versions reported. Return positioned issues and tag warnings, including valid:false for invalid documents. Up to 65536 UTF-8 bytes, depth 64, 8192 nodes and 100 aliases; no model or upstream API.

Price
from $0.0012 USDC per request (starting price; the 402 response quotes the exact amount for your input)
Network
Base mainnet, eip155:8453, settled in USDC through the Coinbase CDP facilitator
Method and URL
POST https://market.561.group/v1/data/yaml-validate
Response type
application/json
Seller
Causeway Services (561 Group)

Input contract

Input that fails this contract is refused with a 4xx status before any payment is requested.

{
  "maxBytes": 102400,
  "bodySchema": {
    "type": "object",
    "additionalProperties": false,
    "required": [
      "text"
    ],
    "properties": {
      "text": {
        "type": "string",
        "maxLength": 65536
      }
    }
  }
}

Example request

{
  "method": "POST",
  "url": "https://market.561.group/v1/data/yaml-validate",
  "headers": {
    "accept": "application/json",
    "content-type": "application/json"
  },
  "body": {
    "text": "defaults: &defaults {active: true}\nowner: *defaults\n"
  }
}

Output

{
  "schema": {
    "type": "object",
    "additionalProperties": false,
    "required": [
      "valid",
      "standard",
      "issues",
      "warnings"
    ],
    "properties": {
      "valid": {
        "type": "boolean"
      },
      "standard": {
        "type": "string"
      },
      "issues": {
        "type": "array"
      },
      "warnings": {
        "type": "array"
      }
    }
  },
  "example": {
    "valid": true,
    "standard": "YAML 1.2",
    "issues": [],
    "warnings": []
  }
}

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.

Read the price without paying

curl --include --request POST --header 'accept: application/json' --header 'content-type: application/json' --data-raw '{"text":"defaults: &defaults {active: true}\nowner: *defaults\n"}' --url 'https://market.561.group/v1/data/yaml-validate'

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

Machine-readable