ToolVet
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Nl Rent Increase Max

by opendata402 in Productivity & SaaS

x402 APIPassing, checked 4 h ago

Maximum legal annual rent increase in the Netherlands for a given increase date and rental sector: social (regulated, per 1 July), mid-rent (regulated middle segment, per calendar year) or free sector (per calendar year, lower of CPI/CAO + 1). With the current rent it also gives the maximum new rent. 2019-2026, each figure with its official source.

GET
https://opendata402.com/v1/nl/rent-increase-max
Price
$0.001
per call in USDC
Uptime
100%
last 30 days
Response time
368 ms
648 ms slowest 5%
Last check
Passed
4 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

GET https://opendata402.com/v1/nl/rent-increase-max

Each call costs $0.001 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.

GET https://opendata402.com/v1/nl/rent-increase-max?date=2026-07-01&rent=1500&sector=free

Parameters

ParameterTypeRequiredDescription
datestringYesDate the increase takes effect.
rentstringNoCurrent monthly base rent in EUR (optional).
sectorstringYessocial, mid or free. One of: social, mid, free.

Example response

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

{
  "date": "2026-07-01",
  "max_increase_eur": 66,
  "max_new_rent_eur": 1566,
  "max_pct": 4.4,
  "rent": 1500,
  "rule": "lower of CPI 3.4 / CAO 5.1, + 1",
  "sector": "free",
  "source": "rijksoverheid.nl 15-12-2025"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://opendata402.com/v1/nl/rent-increase-max?date=2026-07-01&rent=1500&sector=free'

# 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 - 'https://opendata402.com/v1/nl/rent-increase-max?date=2026-07-01&rent=1500&sector=free' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fopendata402.com%2Fv1%2Fnl%2Frent-increase-max
const res = await pay("https://opendata402.com/v1/nl/rent-increase-max?date=2026-07-01&rent=1500&sector=free");
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://opendata402.com/v1/nl/rent-increase-max?date=2026-07-01&rent=1500&sector=free")
    print(res.status_code, res.text)

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