Frankreich: Immobilie & Adresse · x402

dvf-price-m2

Französischer Immobilienpreis pro m² um eine Adresse aus offiziellen DVF-Verkaufsdaten (DGFiP / Etalab, letzte 3 Jahre): Median, p25/p75, Anzahl für Wohnungen und Häuser in einem sich automatisch erweiternden Radius, geokodiert über die Base Adresse Nationale. Nicht verfügbar für Elsass-Mosel und Mayotte.

0.01 USDC / Aufruf · {atomic} atomar · 10000 atomic

Endpunkt

GET|POST https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2
MCP-Tool:: dvf_price_m2

Parameter

Name	Pflicht	Typ	Beschreibung
`address`	Pflicht	string	French street address
`propertyType`	Optional	string	optional: Appartement or Maison
`surface`	Optional	number	optional surface in m2 for an estimate

Beispielanfrage (unbezahlt — 402 erwartet)

curl -sS -D - "https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2?address=10+rue+de+la+Paix%2C+Paris"

Beispiel einer 402-Challenge

Dasselbe Objekt wird auch als base64-Header PAYMENT-REQUIRED gesendet. Beträge sind atomare USDC-Einheiten (6 Dezimalstellen).

{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2",
    "description": "French property price per m2 around an address from official DVF sales records (DGFiP / Etalab, last 3 years): median, p25/p75, count for apartments and houses within an auto-expanding radius, geocoded via Base Adresse Nationale. Not available for Alsace-Moselle and Mayotte.",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "10000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Mit Zahlung wiederholen

curl -sS "https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2?address=10+rue+de+la+Paix%2C+Paris" \
  -H "PAYMENT-SIGNATURE: $PAYMENT"

Beispielantwort

{
  "found": true,
  "geocodedLabel": "10 Rue de la Paix 75002 Paris",
  "apartmentMedianPricePerM2": 12857,
  "apartmentSales": 381,
  "houseMedianPricePerM2": 17846,
  "houseSales": 12
}

Kostenlose Demo / Beispiel

Das ursprüngliche Gateway liefert kein ?demo=1. Ein gekennzeichnetes Beispiel zu diesem Tool liegt auf diesem Hub als statische Datei (keine Livedaten, nicht berechnet).

curl -sS "https://agent-hub.dentreprise.workers.dev/demo/dvf-price-m2.json"

Gekennzeichnete Demo-Antwort

{
  "demo": true,
  "demo_label": "DEMO / SAMPLE — not live data. This is a labelled example response and was not charged.",
  "charged": false,
  "tool": "/api/dvf-price-m2",
  "docs": "https://agent-hub.dentreprise.workers.dev/tools/dvf-price-m2/",
  "how_to_get_live_data": "Call the live URL on the original gateway with an x402 v2 client (@x402/fetch or the Python package x402). This file is a labelled sample only.",
  "sample": {
    "found": true,
    "geocodedLabel": "10 Rue de la Paix 75002 Paris",
    "apartmentMedianPricePerM2": 12857,
    "apartmentSales": 381,
    "houseMedianPricePerM2": 17846,
    "houseSales": 12
  }
}

JavaScript — @x402/fetch

Offizieller x402-v2-Client. Installieren Sie @x402/fetch und @x402/evm. Der ältere Paketname x402-fetch ist die veraltete v1-Linie und sollte für diese Endpunkte nicht verwendet werden.

import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// Official x402 v2 client. The older package name "x402-fetch" is the deprecated v1 line.
const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await fetchWithPayment(
  "https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2?address=10+rue+de+la+Paix%2C+Paris"
);
console.log(await res.json());

Python — x402

Offizielles PyPI-Paket x402. Nutzen Sie x402HttpxClient (async) oder x402_requests (sync) nach register_exact_evm_client mit EthAccountSigner.

import asyncio
import os
from eth_account import Account
from x402 import x402Client
from x402.http.clients import x402HttpxClient
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Official PyPI package: x402
account = Account.from_key(os.environ["EVM_PRIVATE_KEY"])
client = x402Client()
register_exact_evm_client(client, EthAccountSigner(account))

async def main():
    async with x402HttpxClient(client) as http:
        res = await http.get("https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2?address=10+rue+de+la+Paix%2C+Paris")
        print(res.json())

asyncio.run(main())

# Sync alternative:
# from x402 import x402ClientSync
# from x402.http.clients import x402_requests
# client = x402ClientSync()
# register_exact_evm_client(client, EthAccountSigner(account))
# with x402_requests(client) as session:
#     print(session.get("https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2?address=10+rue+de+la+Paix%2C+Paris").json())

MCP-Server — forge-agent-mcp

stdio deckt den gesamten Katalog (beide API-Hosts) ab. Klonen Sie forge-agent-mcp und zeigen Sie mit Ihrem MCP-Client auf src/server.mjs. Die gehostete Streamable-HTTP-Remote am ursprünglichen Gateway stellt weiterhin nur die ursprünglichen Gateway-Tools bereit.

{
  "mcpServers": {
    "forge-agent-hub": {
      "command": "node",
      "args": ["/path/to/forge-agent-mcp/src/server.mjs"]
    },
    "forge-agent-api": {
      "url": "https://x402-gateway.forge-x402.workers.dev/mcp",
      "transport": "streamable-http"
    }
  }
}

LangChain-Tool-Wrapper

Kapseln Sie dieselben x402-Clients als LangChain-Tool mit DynamicStructuredTool (@langchain/core) oder @tool (langchain_core).

import { DynamicStructuredTool } from "@langchain/core/tools";
import { z } from "zod";
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.EVM_PRIVATE_KEY);
const fetchWithPayment = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

export const dvf_price_m2 = new DynamicStructuredTool({
  name: "dvf_price_m2",
  description: "French property price per m2 around an address from official DVF sales records (DGFiP / Etalab, last 3 years): median, p25/p75, count for apartments and houses within an auto-expanding radius, geocoded via Base Adresse Nationale.",
  schema: z.object({}),
  func: async (input) => {
    const res = await fetchWithPayment("https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2" + "?" + new URLSearchParams(input));
    return JSON.stringify(await res.json());
  },
});

import os
from langchain_core.tools import tool
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

account = Account.from_key(os.environ["EVM_PRIVATE_KEY"])
client = x402ClientSync()
register_exact_evm_client(client, EthAccountSigner(account))

@tool
def dvf_price_m2() -> str:
    """French property price per m2 around an address from official DVF sales records (DGFiP / Etalab, last 3 years): median, p25/p75, count for apartments and houses within an auto-expanding radius, geocoded via Base Adresse Nationale."""
    with x402_requests(client) as session:
        return session.get("https://x402-gateway.forge-x402.workers.dev/api/dvf-price-m2").text