Datasets Null Patterns

{
  "data": {
    "inputHash": "sha256:e1a10abead570a8224a14ef15f089bb8a773c1fb4120224a4f8c5a519…",
    "limitations": [
      "Schema and integrity checks do not certify scientific truth, com…"
    ],
    "productId": "dataset-null-pattern-audit",
    "receiptDigest": "sha256:fe528449eb04f7805002625c358d4660192d652d7a72e89e46bb44089…",
    "result": {
      "columns": [
        {
          "column": "x",
          "emptyStrings": 0,
          "missing": 1,
          "nullOrMissingFraction": 0.6666666666666666,
          "nulls": 1,
          "populated": 1
        }
      ],
      "imputationPerformed": false,
      "rowCount": 3
    },
    "resultHash": "sha256:5bc5b6994170b2ebc759ac6bf7f2193ad5a77713d5a29753126c48f64…",
    "version": "maha-workflow/1.0.0"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/verify/datasets/null-patterns' \
  -H 'content-type: application/json' \
  --data-raw '{"columns":["x"],"dataClass":"synthetic","rows":[{"x":0},{"x":null},{}]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://www.mahastrategies.com/api/v1/verify/datasets/null-patterns' \
  -H 'content-type: application/json' \
  --data-raw '{"columns":["x"],"dataClass":"synthetic","rows":[{"x":0},{"x":null},{}]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.010063 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.010063" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.010063 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Fdatasets%2Fnull-patterns&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/datasets/null-patterns", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "columns": [
      "x"
    ],
    "dataClass": "synthetic",
    "rows": [
      {
        "x": 0
      },
      {
        "x": null
      },
      {}
    ]
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.010063 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.010063"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.mahastrategies.com/api/v1/verify/datasets/null-patterns",
        json={
            "columns": [
                "x",
            ],
            "dataClass": "synthetic",
            "rows": [
                {
                    "x": 0,
                },
                {
                    "x": None,
                },
                {},
            ],
        },
    )
    print(res.status_code, res.text)