Alfândegas e comércio · x402

eu-carbon-customs

Emissões incorporadas predefinidas do CBAM da UE (ajustamento de carbono na fronteira) para um código CN/TARIC e um país de origem, a partir do ficheiro oficial de valores predefinidos da Comissão: tCO2e diretas, indiretas e totais por tonelada, via de produção, majoração anual e, opcionalmente, emissões incorporadas e custo dos certificados de um envio (toneladas, preço em EUR).

0.003 USDC / chamada · {atomic} atómico · 3000 atomic

Endpoint

GET|POST https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs

Parâmetros

Nome	Obrigatório	Tipo	Descrição
`cn`	Obrigatório	string	CN/TARIC code 4-10 digits
`country`	Obrigatório	string	Origin country name or ISO alpha-2
`year`	Opcional	string	2026+
`tonnes`	Opcional	string	Shipment mass in tonnes (optional)
`price_eur`	Opcional	string	CBAM certificate price EUR/tCO2e (optional)

Exemplo de pedido (por pagar — espere 402)

curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75"

Exemplo de desafio 402

O mesmo objeto também é enviado como cabeçalho PAYMENT-REQUIRED em base64. Os montantes são unidades atómicas de USDC (6 casas decimais).

{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs",
    "description": "EU CBAM (carbon border adjustment) default embedded emissions for a CN/TARIC code and country of origin, from the official Commission default-values file: direct, indirect and total tCO2e per tonne, production route, year mark-up, and optional embedded emissions and certificate cost for a shipment (tonnes, EUR price).",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "3000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

Tentar de novo com pagamento

curl -sS "https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75" \
  -H "PAYMENT-SIGNATURE: $PAYMENT"

Exemplo de resposta

{
  "cn": "72081000",
  "country_table": "China",
  "items": [
    {
      "description": "Flat-rolled products…",
      "total": 2.5,
      "total_with_markup": 2.75,
      "embedded_emissions_t": 275
    }
  ]
}

Demo / amostra grátis

Esta ferramenta está no worker da vaga 1. ?demo=1 devolve uma amostra ou excerto etiquetado com HTTP 200 e sem pagamento. O corpo não são dados reais. As 3 primeiras chamadas reais com sucesso por IP e dia UTC também são grátis.

curl -sS "https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75&demo=1"

Resposta de demo etiquetada

{
  "demo": true,
  "demo_label": "DEMO / SAMPLE — not live data. This is a labelled example response and was not charged.",
  "charged": false,
  "tool": "/api/eu-carbon-customs",
  "docs": "https://agent-hub.dentreprise.workers.dev/tools/eu-carbon-customs/",
  "how_to_get_live_data": "Call the same URL without demo=1. The first 3 successful real calls per IP per UTC day are free; after that attach an x402 v2 PAYMENT-SIGNATURE (USDC on Base).",
  "sample": {
    "cn": "72081000",
    "country_table": "China",
    "items": [
      {
        "description": "Flat-rolled products…",
        "total": 2.5,
        "total_with_markup": 2.75,
        "embedded_emissions_t": 275
      }
    ]
  }
}

JavaScript — @x402/fetch

Cliente oficial x402 v2. Instale @x402/fetch e @x402/evm. O nome de pacote antigo x402-fetch é a linha v1 descontinuada e não deve ser usado nestes endpoints.

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://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75"
);
console.log(await res.json());

Python — x402

Pacote oficial PyPI x402. Use x402HttpxClient (async) ou x402_requests (sync) depois de register_exact_evm_client com 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://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75")
        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://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs?cn=72081000&country=CN&tonnes=100&price_eur=75").json())

Servidor MCP — forge-agent-mcp

O modo stdio cobre o catálogo completo (ambos os anfitriões de API). Clone forge-agent-mcp e aponte o seu cliente MCP para src/server.mjs. O remoto Streamable HTTP alojado no gateway original continua a expor apenas as ferramentas desse gateway.

{
  "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"
    }
  }
}

Wrapper de ferramenta LangChain

Envolva os mesmos clientes x402 como ferramenta LangChain com DynamicStructuredTool (@langchain/core) ou @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 eu_carbon_customs = new DynamicStructuredTool({
  name: "eu_carbon_customs",
  description: "EU CBAM (carbon border adjustment) default embedded emissions for a CN/TARIC code and country of origin, from the official Commission default-values file: direct, indirect and total tCO2e per tonne, production route, year mark-up, and optional embedded emissions and certificate cost for a shipment (tonnes, EUR price).",
  schema: z.object({}),
  func: async (input) => {
    const res = await fetchWithPayment("https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs" + "?" + 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 eu_carbon_customs() -> str:
    """EU CBAM (carbon border adjustment) default embedded emissions for a CN/TARIC code and country of origin, from the official Commission default-values file: direct, indirect and total tCO2e per tonne, production route, year mark-up, and optional embedded emissions and certificate cost for a shipment (tonnes, EUR price)."""
    with x402_requests(client) as session:
        return session.get("https://forge-tools.dentreprise.workers.dev/api/eu-carbon-customs").text