ToolVet
80trust / 100

Gentrification Index

by prop.halowerk.com in Weather & location

x402 APIPassing, checked 2 h ago

Standardizes current-minus-baseline change by a supplied scale, applies an explicit direction and weight, clips extreme components, and maps the weighted result to a 0–100 descriptive index. Metric selection and interpretation remain with the caller. It does not obtain data, identify individuals, establish causation, rank residents or justify displacement decisions.

POST
https://prop.halowerk.com/v1/gentrification-index
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
114 ms
213 ms slowest 5%
Last check
Passed
2 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://prop.halowerk.com/v1/gentrification-index

Each call costs $0.003 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://prop.halowerk.com/v1/gentrification-index
content-type: application/json

{
  "metrics": [
    {
      "baseline_value": 1100,
      "current_value": 1420,
      "metric_id": "median_rent",
      "normalization_scale": 250,
      "pressure_direction": "increase",
      "weight": 0.4
    },
    {
      "baseline_value": 0.38,
      "current_value": 0.29,
      "metric_id": "low_income_household_share",
      "normalization_scale": 0.08,
      "pressure_direction": "decrease",
      "weight": 0.35
    },
    {
      "baseline_value": 12,
      "current_value": 16,
      "metric_id": "eviction_filings_per_1000",
      "normalization_scale": 5,
      "pressure_direction": "increase",
      "weight": 0.25
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
metricsarray of objectYes

Example response

The listing has no example response.

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://prop.halowerk.com/v1/gentrification-index' \
  -H 'content-type: application/json' \
  --data-raw '{"metrics":[{"baseline_value":1100,"current_value":1420,"metric_id":"median_rent","normalization_scale":250,"pressure_direction":"increase","weight":0.4},{"baseline_value":0.38,"current_value":0.29,"metric_id":"low_income_household_share","normalization_scale":0.08,"pressure_direction":"decrease","weight":0.35},{"baseline_value":12,"current_value":16,"metric_id":"eviction_filings_per_1000","normalization_scale":5,"pressure_direction":"increase","weight":0.25}]}'

# 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://prop.halowerk.com/v1/gentrification-index' \
  -H 'content-type: application/json' \
  --data-raw '{"metrics":[{"baseline_value":1100,"current_value":1420,"metric_id":"median_rent","normalization_scale":250,"pressure_direction":"increase","weight":0.4},{"baseline_value":0.38,"current_value":0.29,"metric_id":"low_income_household_share","normalization_scale":0.08,"pressure_direction":"decrease","weight":0.35},{"baseline_value":12,"current_value":16,"metric_id":"eviction_filings_per_1000","normalization_scale":5,"pressure_direction":"increase","weight":0.25}]}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fprop.halowerk.com%2Fv1%2Fgentrification-index&method=POST
const res = await pay("https://prop.halowerk.com/v1/gentrification-index", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "metrics": [
      {
        "baseline_value": 1100,
        "current_value": 1420,
        "metric_id": "median_rent",
        "normalization_scale": 250,
        "pressure_direction": "increase",
        "weight": 0.4
      },
      {
        "baseline_value": 0.38,
        "current_value": 0.29,
        "metric_id": "low_income_household_share",
        "normalization_scale": 0.08,
        "pressure_direction": "decrease",
        "weight": 0.35
      },
      {
        "baseline_value": 12,
        "current_value": 16,
        "metric_id": "eviction_filings_per_1000",
        "normalization_scale": 5,
        "pressure_direction": "increase",
        "weight": 0.25
      }
    ]
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://prop.halowerk.com/v1/gentrification-index",
        json={
            "metrics": [
                {
                    "baseline_value": 1100,
                    "current_value": 1420,
                    "metric_id": "median_rent",
                    "normalization_scale": 250,
                    "pressure_direction": "increase",
                    "weight": 0.4,
                },
                {
                    "baseline_value": 0.38,
                    "current_value": 0.29,
                    "metric_id": "low_income_household_share",
                    "normalization_scale": 0.08,
                    "pressure_direction": "decrease",
                    "weight": 0.35,
                },
                {
                    "baseline_value": 12,
                    "current_value": 16,
                    "metric_id": "eviction_filings_per_1000",
                    "normalization_scale": 5,
                    "pressure_direction": "increase",
                    "weight": 0.25,
                },
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
2 h agoPassed402219 ms$0.003
6 h agoPassed40298 ms$0.003
9 h agoPassed402117 ms$0.003
12 h agoPassed402103 ms$0.003
15 h agoPassed402178 ms$0.003
Show 10 older checks
18 h agoPassed40297 ms$0.003
21 h agoPassed40298 ms$0.003
24 h agoPassed402100 ms$0.003
29 h agoPassed402107 ms$0.003
34 h agoPassed402144 ms$0.003
39 h agoPassed402104 ms$0.003
44 h agoPassed402105 ms$0.003
2 days agoPassed402123 ms$0.003
2 days agoPassed40296 ms$0.003
3 days agoPassed402141 ms$0.003