Api Contracts Missingness Cooccurrence

{
  "data": {
    "chargedAmount": "20303",
    "inputHash": "sha256:9180740836de336ee0bc5312c36e680b2e73e9b76f47da3beff178e02…",
    "limitations": [
      "Public or synthetic nonpersonal metadata only; these are caller …"
    ],
    "productId": "api-contracts-missingness-cooccurrence",
    "result": {
      "authoritativeSourcesConsulted": false,
      "domainValidationEstablished": false,
      "findings": [],
      "method": "api-contracts-missingness-cooccurrence/1",
      "metrics": [
        {
          "key": "api-owner-input-nulls",
          "recordId": "api",
          "value": "0"
        }
      ]
    },
    "resultHash": "sha256:2ba13092b421cbee6de7f94344f322a20b6adf2b0ea01e789f9ab122f…",
    "version": "maha-typed-metadata-audit/1"
  },
  "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/api-contracts/missingness-cooccurrence' \
  -H 'content-type: application/json' \
  --data-raw '{"contracts":[{"id":"c1","inputDigest":"sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","outputDigest":null,"ownerRef":"owner1"}],"dataClass":"synthetic","nonpersonalMetadata":true}'

# 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/api-contracts/missingness-cooccurrence' \
  -H 'content-type: application/json' \
  --data-raw '{"contracts":[{"id":"c1","inputDigest":"sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa","outputDigest":null,"ownerRef":"owner1"}],"dataClass":"synthetic","nonpersonalMetadata":true}' \
  | 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 $0.020303 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.020303" });
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 $0.020303 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Fapi-contracts%2Fmissingness-cooccurrence&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/api-contracts/missingness-cooccurrence", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "contracts": [
      {
        "id": "c1",
        "inputDigest": "sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
        "outputDigest": null,
        "ownerRef": "owner1"
      }
    ],
    "dataClass": "synthetic",
    "nonpersonalMetadata": true
  }),
});
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 $0.020303 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.020303"})
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/api-contracts/missingness-cooccurrence",
        json={
            "contracts": [
                {
                    "id": "c1",
                    "inputDigest": "sha256:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
                    "outputDigest": None,
                    "ownerRef": "owner1",
                },
            ],
            "dataClass": "synthetic",
            "nonpersonalMetadata": True,
        },
    )
    print(res.status_code, res.text)