Api Contracts Schema Directionality

{
  "data": {
    "chargedAmount": "35091",
    "inputHash": "sha256:e9f95270c3e03379476d4fbffe204c8a7d7cea71f747522a19babee00…",
    "limitations": [
      "Public or synthetic nonpersonal metadata only; these are caller …"
    ],
    "productId": "api-contracts-schema-directionality",
    "result": {
      "authoritativeSourcesConsulted": false,
      "domainValidationEstablished": false,
      "findings": [],
      "method": "api-contracts-schema-directionality/1",
      "metrics": [
        {
          "key": "breaking-change-count",
          "recordId": "contract",
          "value": "0"
        }
      ]
    },
    "resultHash": "sha256:f301e04e57d3ba3c54b3e669dc86cba3f6c8fc38ea6b4c442d56a2950…",
    "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/schema-directionality' \
  -H 'content-type: application/json' \
  --data-raw '{"after":[{"name":"count","nullable":false,"required":true,"type":"integer"}],"before":[{"name":"count","nullable":false,"required":true,"type":"integer"}],"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/schema-directionality' \
  -H 'content-type: application/json' \
  --data-raw '{"after":[{"name":"count","nullable":false,"required":true,"type":"integer"}],"before":[{"name":"count","nullable":false,"required":true,"type":"integer"}],"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 $0.035091 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.035091" });
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 $0.035091 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Fapi-contracts%2Fschema-directionality&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/api-contracts/schema-directionality", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "after": [
      {
        "name": "count",
        "nullable": false,
        "required": true,
        "type": "integer"
      }
    ],
    "before": [
      {
        "name": "count",
        "nullable": false,
        "required": true,
        "type": "integer"
      }
    ],
    "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 $0.035091 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.035091"})
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/schema-directionality",
        json={
            "after": [
                {
                    "name": "count",
                    "nullable": False,
                    "required": True,
                    "type": "integer",
                },
            ],
            "before": [
                {
                    "name": "count",
                    "nullable": False,
                    "required": True,
                    "type": "integer",
                },
            ],
            "dataClass": "synthetic",
            "nonpersonalMetadata": True,
        },
    )
    print(res.status_code, res.text)