インストール
npm install l402-kit ai
基本ツール
import { tool } from "ai";
import { z } from "zod";
import { l402Client, buildWallet } from "l402-kit/agent";
const wallet = buildWallet(process.env);
const client = l402Client({ wallet, budgetSats: 1000 });
export const paidFetch = tool({
description: "Fetch data from an L402-protected paid API using Bitcoin Lightning",
parameters: z.object({
url: z.string().describe("The API endpoint to call"),
}),
execute: async ({ url }) => {
const res = await client.fetch(url);
return res.json();
},
});
Next.js App Router — 完全な例
// app/api/chat/route.ts
import { openai } from "@ai-sdk/openai";
import { streamText } from "ai";
import { paidFetch } from "@/lib/tools";
export async function POST(req: Request) {
const { messages } = await req.json();
const result = streamText({
model: openai("gpt-4o"),
system: `You have access to paid APIs via the L402 protocol.
Use the paidFetch tool when you need data from an external paid source.
Budget: 1000 sats per session.`,
messages,
tools: { paidFetch },
maxSteps: 5,
});
return result.toDataStreamResponse();
}
// app/page.tsx
"use client";
import { useChat } from "ai/react";
export default function Chat() {
const { messages, input, handleInputChange, handleSubmit } = useChat();
return (
<div>
{messages.map(m => (
<div key={m.id}>
<strong>{m.role}:</strong> {m.content}
</div>
))}
<form onSubmit={handleSubmit}>
<input value={input} onChange={handleInputChange} />
<button type="submit">Send</button>
</form>
</div>
);
}
Claude、GPT-4、Gemini との互換性
import { anthropic } from "@ai-sdk/anthropic";
import { google } from "@ai-sdk/google";
// Claude
streamText({ model: anthropic("claude-sonnet-4-6"), tools: { paidFetch }, ... });
// Gemini
streamText({ model: google("gemini-1.5-pro"), tools: { paidFetch }, ... });
環境設定
# .env.local
BLINK_API_KEY=your-blink-api-key
# or
ALBY_TOKEN=your-alby-token