x402-listing-check
Comprueba que un host expone un listado de descubrimiento x402 válido (/.well-known/x402, x402.json, x402-listing): JSON, versión, URL de recursos https, mismo host, acompañantes (/openapi.json, /llms.txt), y sondea hasta 10 recursos listados en busca de un desafío 402 real con un payTo coherente. Nunca paga.
Endpoint
GET|POST https://forge-tools.dentreprise.workers.dev/api/x402-listing-check
Parámetros
| Nombre | Obligatorio | Tipo | Descripción |
|---|---|---|---|
url | Obligatorio | string | Host or origin URL |
probe | Opcional | string | Resources to probe, 0-10, default 5 |
Ejemplo de petición (sin pagar — se espera 402)
curl -sS -D - "https://forge-tools.dentreprise.workers.dev/api/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev"
Ejemplo de desafío 402
El mismo objeto se envía también como cabecera PAYMENT-REQUIRED en base64. Las cantidades son unidades atómicas de USDC (6 decimales).
{
"x402Version": 2,
"error": "Payment required",
"resource": {
"url": "https://forge-tools.dentreprise.workers.dev/api/x402-listing-check",
"description": "Checks that a host exposes a valid x402 discovery listing (/.well-known/x402, x402.json, x402-listing): JSON, version, https resource URLs, same host, companions (/openapi.json, /llms.txt), and probes up to 10 listed resources for a real 402 challenge with consistent payTo. Never pays.",
"mimeType": "application/json"
},
"accepts": [
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "1000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]
}Reintentar con pago
curl -sS "https://forge-tools.dentreprise.workers.dev/api/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev" \ -H "PAYMENT-SIGNATURE: $PAYMENT"
Ejemplo de respuesta
{
"verdict": "valid",
"resources_count": 14,
"probes": [
{
"status": 402,
"ok": true
}
]
}Demo / muestra gratuita
Esta herramienta está en el worker de la oleada 1. ?demo=1 devuelve una muestra o un extracto etiquetado con HTTP 200 y sin pago. El cuerpo no son datos en vivo. Las 3 primeras llamadas reales con éxito por IP y día UTC también son gratuitas.
curl -sS "https://forge-tools.dentreprise.workers.dev/api/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev&demo=1"
Respuesta 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/x402-listing-check",
"docs": "https://agent-hub.dentreprise.workers.dev/tools/x402-listing-check/",
"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": {
"verdict": "valid",
"resources_count": 14,
"probes": [
{
"status": 402,
"ok": true
}
]
}
}JavaScript — @x402/fetch
Cliente oficial x402 v2. Instale @x402/fetch y @x402/evm. El nombre de paquete antiguo x402-fetch es la línea v1 obsoleta y no debe usarse con estos 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/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev"
);
console.log(await res.json());Python — x402
Paquete oficial de PyPI x402. Use x402HttpxClient (async) o x402_requests (sync) tras register_exact_evm_client con 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/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev")
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/x402-listing-check?url=https%3A%2F%2Fx402-gateway.forge-x402.workers.dev").json())Servidor MCP — forge-agent-mcp
stdio cubre el catálogo completo (ambos hosts de API). Clone forge-agent-mcp y apunte su cliente MCP a src/server.mjs. El remoto Streamable HTTP alojado en la pasarela original sigue exponiendo solo las herramientas de esa pasarela.
{
"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"
}
}
}Contenedor de herramienta LangChain
Envuelva los mismos clientes x402 como herramienta LangChain con DynamicStructuredTool (@langchain/core) o @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 x402_listing_check = new DynamicStructuredTool({
name: "x402_listing_check",
description: "Checks that a host exposes a valid x402 discovery listing (/.",
schema: z.object({}),
func: async (input) => {
const res = await fetchWithPayment("https://forge-tools.dentreprise.workers.dev/api/x402-listing-check" + "?" + 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 x402_listing_check() -> str:
"""Checks that a host exposes a valid x402 discovery listing (/."""
with x402_requests(client) as session:
return session.get("https://forge-tools.dentreprise.workers.dev/api/x402-listing-check").textEndpoints relacionados
x402-compliance
Comprobador de conformidad x402 V2: sondea cualquier endpoint de pago sin pagar y verifica el desafío 402 (cabecera PAYMENT-REQUIRED, x402Version 2, esquema accepts[], red CAIP-2, importe atómico, activo USDC canónico, payTo, maxTimeoutSeconds, extra EIP-712, resource, extensión Bazaar, CORS) y que un 200 gratuito o cabeceras de pago falsificadas nunca desbloqueen el recurso.
x402-manifest-from-openapi
Convierte una especificación OpenAPI 3.
x402-facilitator-health
Comprobación de salud de un facilitador x402: llama a GET /supported en un facilitador (o en una lista predeterminada que incluye CDP, xpay, x402.