Policies Version Comparison

{
  "data": {
    "chargedAmount": "17002",
    "inputHash": "sha256:7b79acb2a65dfb30f4c116e2c4e5b4d132e30dbeb6c0205acffe42c57…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "policy-version-comparison",
    "result": {
      "added": [],
      "afterDigest": "sha256:104dd5865b0149480461aa21a51f2edfa4ba0d51c60aad999496b0fa4…",
      "beforeDigest": "sha256:2b44232263e7fe7e523c334678c39988458d71e04c3b82c3f6d1743df…",
      "changed": [
        {
          "clauseId": "retain",
          "fields": [
            "text"
          ]
        }
      ],
      "legalEffectDetermined": false,
      "policyId": "example-policy",
      "removed": []
    },
    "resultHash": "sha256:81a16d6bfee303e46af868b27d73f3790e4dba841edc0f2e6f16f80f2…",
    "sourceContractAmount": "17000",
    "version": "maha-legacy-adapter/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/context/policies/version-comparison' \
  -H 'content-type: application/json' \
  --data-raw '{"after":[{"clauseId":"retain","scope":"sandbox","text":"Retain for three days."}],"afterSequence":2,"afterVersion":"v2","before":[{"clauseId":"retain","scope":"sandbox","text":"Retain for seven days."}],"beforeSequence":1,"beforeVersion":"v1","dataClass":"synthetic","policyId":"example-policy"}'

# 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/context/policies/version-comparison' \
  -H 'content-type: application/json' \
  --data-raw '{"after":[{"clauseId":"retain","scope":"sandbox","text":"Retain for three days."}],"afterSequence":2,"afterVersion":"v2","before":[{"clauseId":"retain","scope":"sandbox","text":"Retain for seven days."}],"beforeSequence":1,"beforeVersion":"v1","dataClass":"synthetic","policyId":"example-policy"}' \
  | 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 $0.017002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.017002" });
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 $0.017002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcontext%2Fpolicies%2Fversion-comparison&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/context/policies/version-comparison", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "after": [
      {
        "clauseId": "retain",
        "scope": "sandbox",
        "text": "Retain for three days."
      }
    ],
    "afterSequence": 2,
    "afterVersion": "v2",
    "before": [
      {
        "clauseId": "retain",
        "scope": "sandbox",
        "text": "Retain for seven days."
      }
    ],
    "beforeSequence": 1,
    "beforeVersion": "v1",
    "dataClass": "synthetic",
    "policyId": "example-policy"
  }),
});
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 $0.017002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.017002"})
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/context/policies/version-comparison",
        json={
            "after": [
                {
                    "clauseId": "retain",
                    "scope": "sandbox",
                    "text": "Retain for three days.",
                },
            ],
            "afterSequence": 2,
            "afterVersion": "v2",
            "before": [
                {
                    "clauseId": "retain",
                    "scope": "sandbox",
                    "text": "Retain for seven days.",
                },
            ],
            "beforeSequence": 1,
            "beforeVersion": "v1",
            "dataClass": "synthetic",
            "policyId": "example-policy",
        },
    )
    print(res.status_code, res.text)