ToolVet
78trust / 100

Tools Contract Compatibility

by mahastrategies.com in Onchain & crypto

x402 APIPassing, checked 1 h ago

Check declared MCP tool contracts before an upgrade. Compare required names and exact input/output schema digests with a supplied server snapshot, protocol version and transport. No server contact, semantic schema-subtyping proof or official conformance certification. 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/tools/contract-compatibility
Price
$0.015
per call in USDC
Uptime
100%
last 30 days
Response time
239 ms
3.1 s slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://www.mahastrategies.com/api/v1/verify/tools/contract-compatibility

Each call costs $0.015002 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/tools/contract-compatibility
content-type: application/json

{
  "dataClass": "synthetic",
  "offered": {
    "protocolVersion": "2025-06-18",
    "tools": [
      {
        "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
        "name": "synthetic-tool",
        "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
      }
    ],
    "transport": "stdio"
  },
  "required": {
    "protocolVersion": "2025-06-18",
    "tools": [
      {
        "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
        "name": "synthetic-tool",
        "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
      }
    ],
    "transport": "stdio"
  }
}

Parameters

ParameterTypeRequiredDescription
dataClassstringYes One of: public, synthetic.
offeredobjectYes
requiredobjectYes

Example response

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

{
  "data": {
    "chargedAmount": "15002",
    "inputHash": "sha256:62ba542a540b2a83661913e97fc2e8284f205d8b66c5061e378412114…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "mcp-contract-compatibility",
    "result": {
      "comparison": "exact-schema-digests; no semantic subtyping",
      "issues": [],
      "officialConformanceClaimed": false,
      "serverContacted": false,
      "state": "exact-declarations-compatible"
    },
    "resultHash": "sha256:bd3241e03bd31ad172c8effb590851d0754c1480e65acc7b187ba1ee9…",
    "sourceContractAmount": "15000",
    "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 $0.015002.

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/tools/contract-compatibility' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","offered":{"protocolVersion":"2025-06-18","tools":[{"inputSchemaDigest":"sha256:1111111111111111111111111111111111111111111111111111111111111111","name":"synthetic-tool","outputSchemaDigest":"sha256:2222222222222222222222222222222222222222222222222222222222222222"}],"transport":"stdio"},"required":{"protocolVersion":"2025-06-18","tools":[{"inputSchemaDigest":"sha256:1111111111111111111111111111111111111111111111111111111111111111","name":"synthetic-tool","outputSchemaDigest":"sha256:2222222222222222222222222222222222222222222222222222222222222222"}],"transport":"stdio"}}'

# 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/tools/contract-compatibility' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","offered":{"protocolVersion":"2025-06-18","tools":[{"inputSchemaDigest":"sha256:1111111111111111111111111111111111111111111111111111111111111111","name":"synthetic-tool","outputSchemaDigest":"sha256:2222222222222222222222222222222222222222222222222222222222222222"}],"transport":"stdio"},"required":{"protocolVersion":"2025-06-18","tools":[{"inputSchemaDigest":"sha256:1111111111111111111111111111111111111111111111111111111111111111","name":"synthetic-tool","outputSchemaDigest":"sha256:2222222222222222222222222222222222222222222222222222222222222222"}],"transport":"stdio"}}' \
  | 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 $0.015002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.015002" });
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 $0.015002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Ftools%2Fcontract-compatibility&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/tools/contract-compatibility", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "offered": {
      "protocolVersion": "2025-06-18",
      "tools": [
        {
          "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
          "name": "synthetic-tool",
          "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
        }
      ],
      "transport": "stdio"
    },
    "required": {
      "protocolVersion": "2025-06-18",
      "tools": [
        {
          "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
          "name": "synthetic-tool",
          "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222"
        }
      ],
      "transport": "stdio"
    }
  }),
});
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 $0.015002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.015002"})
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/tools/contract-compatibility",
        json={
            "dataClass": "synthetic",
            "offered": {
                "protocolVersion": "2025-06-18",
                "tools": [
                    {
                        "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
                        "name": "synthetic-tool",
                        "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222",
                    },
                ],
                "transport": "stdio",
            },
            "required": {
                "protocolVersion": "2025-06-18",
                "tools": [
                    {
                        "inputSchemaDigest": "sha256:1111111111111111111111111111111111111111111111111111111111111111",
                        "name": "synthetic-tool",
                        "outputSchemaDigest": "sha256:2222222222222222222222222222222222222222222222222222222222222222",
                    },
                ],
                "transport": "stdio",
            },
        },
    )
    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
1 h agoPassed4023.1 s$0.015
6 h agoPassed402226 ms$0.015
10 h agoPassed402239 ms$0.015
14 h agoPassed402278 ms$0.015
18 h agoPassed402347 ms$0.015
Show 4 older checks
22 h agoPassed402303 ms$0.015
27 h agoPassed402203 ms$0.015
31 h agoPassed402190 ms$0.015
41 h agoPassed402177 ms$0.015