Public Finance Variance Bridge

{
  "data": {
    "chargedAmount": "10030",
    "inputHash": "sha256:5e66f86e198fc00a5c7ac674375c27e9819bc09fa023fc76ed27d0024…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "spending-variance-bridge",
    "result": {
      "afterTotalMinor": "125",
      "beforeTotalMinor": "100",
      "currency": "USD",
      "dataClass": "synthetic",
      "knownLineDeltaMinor": "25",
      "limitations": [
        "Aggregate supplied integer minor units only. Known-line delta is…"
      ],
      "lines": [
        {
          "afterMinor": "125",
          "beforeMinor": "100",
          "deltaMinor": "25",
          "id": "research"
        }
      ],
      "netDeltaMinor": "25",
      "periods": {
        "after": "q2",
        "before": "q1"
      },
      "serviceId": "spending-variance-bridge",
      "unknownLineIds": []
    },
    "resultHash": "sha256:fa3c7b6e2851a05b1167c0ec6525401a3730ee924595864ac4e850d3c…",
    "sourceContractAmount": "55000",
    "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/compute/public-finance/variance-bridge' \
  -H 'content-type: application/json' \
  --data-raw '{"aggregateOnly":true,"currency":"USD","dataClass":"synthetic","lines":[{"afterMinor":"125","beforeMinor":"100","id":"research"}],"periods":{"after":"q2","before":"q1"}}'

# 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/compute/public-finance/variance-bridge' \
  -H 'content-type: application/json' \
  --data-raw '{"aggregateOnly":true,"currency":"USD","dataClass":"synthetic","lines":[{"afterMinor":"125","beforeMinor":"100","id":"research"}],"periods":{"after":"q2","before":"q1"}}' \
  | 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 $0.01003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01003" });
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 $0.01003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fcompute%2Fpublic-finance%2Fvariance-bridge&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/compute/public-finance/variance-bridge", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "aggregateOnly": true,
    "currency": "USD",
    "dataClass": "synthetic",
    "lines": [
      {
        "afterMinor": "125",
        "beforeMinor": "100",
        "id": "research"
      }
    ],
    "periods": {
      "after": "q2",
      "before": "q1"
    }
  }),
});
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 $0.01003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01003"})
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/compute/public-finance/variance-bridge",
        json={
            "aggregateOnly": True,
            "currency": "USD",
            "dataClass": "synthetic",
            "lines": [
                {
                    "afterMinor": "125",
                    "beforeMinor": "100",
                    "id": "research",
                },
            ],
            "periods": {
                "after": "q2",
                "before": "q1",
            },
        },
    )
    print(res.status_code, res.text)