561 Group Market

SEN Reading Conflation

SignChain's conflation of one reading, by its extremal name: exchange unknown and contested, fixing held and denied.

Price
$0.002 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/sen/conflate-reading/{name}
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.

{
  "pathParamsSchema": {
    "properties": {
      "name": {
        "enum": [
          "unknown",
          "held",
          "denied",
          "contested"
        ]
      }
    },
    "required": [
      "name"
    ]
  }
}

Example request

{
  "method": "GET",
  "url": "https://market.561.group/v1/sen/conflate-reading/unknown",
  "headers": {
    "accept": "application/json"
  }
}

Output

{
  "schema": {
    "type": "string"
  },
  "example": "contested"
}

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 GET --header 'accept: application/json' --url 'https://market.561.group/v1/sen/conflate-reading/unknown'

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

Machine-readable