Download

Install Tollgate SDKs

Both SDKs are MIT-licensed and published to npm. Install only what your side of the market needs.

tollgate-sdk

Publisher SDK

Drop-in middleware for Express, Next.js, Fastify, and Cloudflare Workers. Requires only your Solana wallet address — no API key, no signup.

Install

npm install tollgate-sdk

Express

import { createPaywall } from "tollgate-sdk"; import { expressMiddleware } from "tollgate-sdk/express";

Next.js

import { paywallMiddleware } from "tollgate-sdk/nextjs";

Fastify

import { fastifyPlugin } from "tollgate-sdk/fastify";

Cloudflare Workers

import { cloudflareHandler } from "tollgate-sdk/cloudflare";

Minimum config

const paywall = createPaywall({
  walletAddress: process.env.SOLANA_WALLET_ADDRESS,
  network: "mainnet-beta",
  basePriceMicroUsdc: 1_000, // $0.001 per crawl
});

app.use(expressMiddleware(paywall));

tollgate-agent-sdk

Agent SDK

Drop-in 402-paywall client for AI agents. Handles detection, payment, and retry automatically. Peer dependencies required.

Install (with peer deps)

npm install tollgate-agent-sdk @solana/web3.js @solana/spl-token @x402-solana/core

LangChain tool

import { paywallFetchTool } from "tollgate-agent-sdk/langchain";

Minimum config

import { createAgentPaywallClient, fromKeypairFile } from "tollgate-agent-sdk";

const client = createAgentPaywallClient({
  network: "mainnet-beta",
  signer: fromKeypairFile(),      // ~/.config/solana/id.json
  maxAmountMicroUsdc: 10_000,     // never pay > $0.01/request
  maxTotalMicroUsdc: 1_000_000,   // session budget: $1.00
});

const res = await client.fetch("https://site.com/article");
console.log("paid:", res.paywallPayment?.signature);