ToolVet
75trust / 100

Payments Buyer Policy

by Buyer Spending Policy Check in Security & trust

x402 APIPassing, checked 6 h ago

Compare up to 64 proposed Base-USDC calls with a declared total budget, per-call cap, allowed payees and human-approval requirement. Returns policy mismatches and exact arithmetic totals. Does not authorize, sign or execute payments; caller approval labels are not verified. New modular adapter: retained result recovery for 24 hours, minimal receipt metadata for 90 days. Existing live route unchanged.

POST https://www.mahastrategies.com/api/v1/verify/payments/buyer-policy

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
169 ms typical, 169 ms slowest 5%
Last check
6 h ago
Next check
in 32 min

How to call it

POST https://www.mahastrategies.com/api/v1/verify/payments/buyer-policy

Each call costs $0.010021 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://www.mahastrategies.com/api/v1/verify/payments/buyer-policy
content-type: application/json

{
  "allowedPayees": [
    "0x1111111111111111111111111111111111111111"
  ],
  "budgetBaseUnits": "100000",
  "calls": [
    {
      "amountBaseUnits": "10000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "humanApproved": true,
      "id": "call-1",
      "network": "eip155:8453",
      "payee": "0x1111111111111111111111111111111111111111"
    }
  ],
  "dataClass": "synthetic",
  "perCallCapBaseUnits": "50000",
  "requireHumanApproval": true
}

Parameters

ParameterTypeRequiredDescription
allowedPayeesarrayYes
budgetBaseUnitsstringYes
callsarrayYes
dataClassstringYes One of: public, synthetic.
perCallCapBaseUnitsstringYes
requireHumanApprovalbooleanYes

Example response

The provider's example. We can't check it without paying.

Example response, 29 lines
{
  "data": {
    "chargedAmount": "10021",
    "inputHash": "sha256:0f4dac29db1854377d921e11b99fe353c34e61a599e821bd68625510c…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "buyer-spending-policy-check",
    "result": {
      "budgetExceeded": false,
      "checks": [
        {
          "codes": [],
          "id": "call-1"
        }
      ],
      "consistent": true,
      "executionAuthorized": false,
      "totalBaseUnits": "10000"
    },
    "resultHash": "sha256:207a9dd76b6b5af30be3b40b9d6200d687dc6b8077a53a455eca0d0bc…",
    "sourceContractAmount": "35000",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.010021.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/verify/payments/buyer-policy' \
  -H 'content-type: application/json' \
  --data-raw '{"allowedPayees":["0x1111111111111111111111111111111111111111"],"budgetBaseUnits":"100000","calls":[{"amountBaseUnits":"10000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","humanApproved":true,"id":"call-1","network":"eip155:8453","payee":"0x1111111111111111111111111111111111111111"}],"dataClass":"synthetic","perCallCapBaseUnits":"50000","requireHumanApproval":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/payments/buyer-policy' \
  -H 'content-type: application/json' \
  --data-raw '{"allowedPayees":["0x1111111111111111111111111111111111111111"],"budgetBaseUnits":"100000","calls":[{"amountBaseUnits":"10000","asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","humanApproved":true,"id":"call-1","network":"eip155:8453","payee":"0x1111111111111111111111111111111111111111"}],"dataClass":"synthetic","perCallCapBaseUnits":"50000","requireHumanApproval":true}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.010021 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.010021" });
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 $0.010021 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Fpayments%2Fbuyer-policy&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/payments/buyer-policy", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "allowedPayees": [
      "0x1111111111111111111111111111111111111111"
    ],
    "budgetBaseUnits": "100000",
    "calls": [
      {
        "amountBaseUnits": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "humanApproved": true,
        "id": "call-1",
        "network": "eip155:8453",
        "payee": "0x1111111111111111111111111111111111111111"
      }
    ],
    "dataClass": "synthetic",
    "perCallCapBaseUnits": "50000",
    "requireHumanApproval": true
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.010021 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.010021"})
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/payments/buyer-policy",
        json={
            "allowedPayees": [
                "0x1111111111111111111111111111111111111111",
            ],
            "budgetBaseUnits": "100000",
            "calls": [
                {
                    "amountBaseUnits": "10000",
                    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
                    "humanApproved": True,
                    "id": "call-1",
                    "network": "eip155:8453",
                    "payee": "0x1111111111111111111111111111111111111111",
                },
            ],
            "dataClass": "synthetic",
            "perCallCapBaseUnits": "50000",
            "requireHumanApproval": True,
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
6 h agoPassed402169 ms$0.01