tollkit.dev

Paid developer tools for AI agents.

A family of pay-per-call APIs that AI agents can use without API keys, contracts, or monthly subscriptions. Plug in a wallet, call the endpoint, settle in USDC over x402.

View products GitHub

Products

Each tool is an independent paid endpoint. Drop the matching MCP into Claude Desktop, Cursor, or Windsurf — the agent calls it on your behalf, your wallet settles the toll.

x402-sms

Live
Send transactional SMS to US recipients. Twilio-backed, toll-free verified, TCPA-compliant. $0.03 USDC per message.
sms.tollkit.dev →

x402-extract

Coming soon
Pay-per-call structured web extraction. Point an agent at a URL, get clean structured data back. Per-page pricing.
In development.

Got a tool in mind?

Open
tollkit.dev is an umbrella for paid agent-facing APIs. If there's a service you wish your agent could just call and pay for, we'd love to hear it.
hello@tollkit.dev

How it works

Three steps from zero to a working paid tool call.

1

Fund a wallet

Drop USDC and a little ETH into any wallet on Base. That's the buyer's tab.

2

Install the MCP

Add the tool's MCP server to Claude Desktop, Cursor, or Windsurf. Paste your wallet key into the config.

3

Let the agent call

Ask your agent to do the thing. The MCP signs the payment, the server settles over x402, you get the result.

Built for developers

Open-source clients, public seller code, no vendor lock-in. If you want to host your own seller for a tool, the patterns are reusable.

GitHub: @UltraStarz Protocol: x402 Settlement: Base (USDC)