ToolVet
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Assignment

by Bounded Decision Solver in Productivity & SaaS

x402 APIPassing, checked 1 h ago

Assignment solver — exact minimum-cost worker-to-task matching for resource allocation, with deterministic choices and a primal/dual optimality certificate.

POST
https://decision-solver.use.x402atlas.com/assignment
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
455 ms
536 ms slowest 5%
Last check
Passed
1 h ago, next any minute now

Run a free test callHow to call it

Reliability

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

How to call it

POST https://decision-solver.use.x402atlas.com/assignment

Each call costs $0.005 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://decision-solver.use.x402atlas.com/assignment
content-type: application/json

{
  "costs": [
    [
      4,
      1,
      3
    ],
    [
      2,
      0,
      5
    ],
    [
      3,
      2,
      2
    ]
  ]
}

Parameters

ParameterTypeRequiredDescription
costsarray of array of integerYesRectangular worker-by-task cost matrix; workers <= tasks and each worker receives one distinct task

Example response

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

Example response, 45 lines
{
  "algorithm_version": "hungarian-min-v1",
  "certificate": {
    "column_potentials": [
      0,
      -2,
      0
    ],
    "padded_assignment": [
      1,
      0,
      2
    ],
    "row_potentials": [
      3,
      2,
      2
    ]
  },
  "objective": "minimum_total_cost",
  "objective_value": 5,
  "operation": "assignment",
  "optimal": true,
  "solution": {
    "assignments": [
      {
        "cost": 1,
        "task_index": 1,
        "worker_index": 0
      },
      {
        "cost": 2,
        "task_index": 0,
        "worker_index": 1
      },
      {
        "cost": 2,
        "task_index": 2,
        "worker_index": 2
      }
    ]
  },
  "warnings": [],
  "work_units": 24
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://decision-solver.use.x402atlas.com/assignment' \
  -H 'content-type: application/json' \
  --data-raw '{"costs":[[4,1,3],[2,0,5],[3,2,2]]}'

# 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://decision-solver.use.x402atlas.com/assignment' \
  -H 'content-type: application/json' \
  --data-raw '{"costs":[[4,1,3],[2,0,5],[3,2,2]]}' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fdecision-solver.use.x402atlas.com%2Fassignment&method=POST
const res = await pay("https://decision-solver.use.x402atlas.com/assignment", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "costs": [
      [
        4,
        1,
        3
      ],
      [
        2,
        0,
        5
      ],
      [
        3,
        2,
        2
      ]
    ]
  }),
});
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://decision-solver.use.x402atlas.com/assignment",
        json={
            "costs": [
                [
                    4,
                    1,
                    3,
                ],
                [
                    2,
                    0,
                    5,
                ],
                [
                    3,
                    2,
                    2,
                ],
            ],
        },
    )
    print(res.status_code, res.text)

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