561 Group Market

XML Serialization Normalization

Normalize one XML 1.0 document through ordered nodes: double-quoted attributes, escaped retained values, empty-element serialization and UTF-8 declarations. Preserve parsed mixed text, CDATA, comments, processing instructions and qualified names. XML line-ending/attribute rules apply; lexical spelling may change. Not Canonical XML/C14N. No DTD/XML1.1, custom entities, fetch or schema validation. Bounds: 65536 XML bytes, 1048576 JSON bytes, 8192 nodes/attributes, depth 64.

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/xml-normalize
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": 1048576,
  "bodySchema": {
    "type": "object",
    "required": [
      "xml"
    ],
    "properties": {
      "xml": {
        "type": "string",
        "maxLength": 65536,
        "description": "Decoded Unicode XML; maximum 65536 UTF-8 bytes, 8192 nodes/attributes and depth 64."
      }
    },
    "additionalProperties": false
  }
}

Example request

{
  "method": "POST",
  "url": "https://market.561.group/v1/data/xml-normalize",
  "headers": {
    "accept": "application/json",
    "content-type": "application/json"
  },
  "body": {
    "xml": "<r a='x&#xD;y'>text&#13;tail</r>"
  }
}

Output

{
  "schema": {
    "type": "object",
    "required": [
      "xml",
      "byteLength",
      "sourceByteLength",
      "changed"
    ],
    "properties": {
      "xml": {
        "type": "string",
        "maxLength": 65536,
        "description": "Decoded Unicode XML; maximum 65536 UTF-8 bytes, 8192 nodes/attributes and depth 64."
      },
      "byteLength": {
        "type": "integer",
        "minimum": 0,
        "maximum": 65536
      },
      "sourceByteLength": {
        "type": "integer",
        "minimum": 0,
        "maximum": 65536
      },
      "changed": {
        "type": "boolean"
      }
    },
    "additionalProperties": false
  },
  "example": {
    "xml": "<r a=\"x&#13;y\">text&#13;tail</r>",
    "byteLength": 32,
    "sourceByteLength": 32,
    "changed": true
  }
}

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 '{"xml":"<r a='\''x&#xD;y'\''>text&#13;tail</r>"}' --url 'https://market.561.group/v1/data/xml-normalize'

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

Machine-readable