561 Group Market

Exact Bytes Against SHA-2 Multihash

Compare up to 65536 exact caller bytes with a canonical base32-lower SHA2-256/512 multihash. Return matches plus claimed and independently computed addresses and algorithm; a well-formed mismatch is a useful paid result. Malformed commitments/carriers refuse before payment. Maximum 1024 address characters. Uses exact digest bytes; caller media type supplies no authority. No network, storage, author authentication or claim of delivery acceptance.

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/multihash-verify
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": 544768,
  "bodySchema": {
    "type": "object",
    "additionalProperties": false,
    "required": [
      "carrier",
      "address"
    ],
    "properties": {
      "carrier": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "mediaType",
          "contentBase64"
        ],
        "properties": {
          "mediaType": {
            "type": "string",
            "minLength": 1,
            "maxLength": 1024,
            "description": "Caller label, not authentication or content-format validation. Maximum 1024 UTF-8 bytes."
          },
          "contentBase64": {
            "type": "string",
            "maxLength": 87384,
            "description": "Canonical padded RFC 4648 Base64 of at most 65536 exact bytes; full JSON escaping admitted."
          }
        }
      },
      "address": {
        "type": "string",
        "minLength": 1,
        "maxLength": 1024
      }
    }
  }
}

Example request

{
  "method": "POST",
  "url": "https://market.561.group/v1/data/multihash-verify",
  "headers": {
    "accept": "application/json",
    "content-type": "application/json"
  },
  "body": {
    "carrier": {
      "mediaType": "application/octet-stream",
      "contentBase64": "YWJj"
    },
    "address": "bciqlu6awx6hqdt7kifaubxs5vyrchmadmgrzmf32ts2bb73b6iablli"
  }
}

Output

{
  "schema": {
    "type": "object",
    "required": [
      "kind",
      "profile",
      "matches",
      "claimedAddress",
      "expectedAddress",
      "algorithm"
    ],
    "properties": {
      "kind": {
        "const": "multihash-verification"
      },
      "profile": {
        "const": "multihash/base32-lower/sha2"
      },
      "matches": {
        "type": "boolean"
      },
      "claimedAddress": {
        "type": "string",
        "minLength": 1,
        "maxLength": 1024
      },
      "expectedAddress": {
        "type": "string",
        "minLength": 1,
        "maxLength": 1024
      },
      "algorithm": {
        "enum": [
          "sha2-256",
          "sha2-512"
        ]
      }
    }
  },
  "example": {
    "kind": "multihash-verification",
    "profile": "multihash/base32-lower/sha2",
    "matches": true,
    "claimedAddress": "bciqlu6awx6hqdt7kifaubxs5vyrchmadmgrzmf32ts2bb73b6iablli",
    "expectedAddress": "bciqlu6awx6hqdt7kifaubxs5vyrchmadmgrzmf32ts2bb73b6iablli",
    "algorithm": "sha2-256"
  }
}

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 '{"carrier":{"mediaType":"application/octet-stream","contentBase64":"YWJj"},"address":"bciqlu6awx6hqdt7kifaubxs5vyrchmadmgrzmf32ts2bb73b6iablli"}' --url 'https://market.561.group/v1/data/multihash-verify'

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

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