561 Group Market

SEN Canonicalize

Re-encode a JSON carrier in canonical form: the identity morphism on the JSON wire, witnessing representation-independence.

Price
$0.001 USDC per request
Network
Base mainnet, eip155:8453, settled in USDC through the Coinbase CDP facilitator
Method and URL
POST https://market.561.group/v1/sen/canonicalize
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
}

Example request

{
  "method": "POST",
  "url": "https://market.561.group/v1/sen/canonicalize",
  "headers": {
    "accept": "application/json",
    "content-type": "application/json"
  },
  "body": {
    "b": 2,
    "a": 1
  }
}

Output

{
  "schema": {
    "type": "object"
  },
  "example": {
    "a": 1,
    "b": 2
  }
}

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 '{"b":2,"a":1}' --url 'https://market.561.group/v1/sen/canonicalize'

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

Machine-readable