opendexter

OpenDexter

x402 payments for AI agents — search, pay, and build with paid APIs.
Skills, rules, tools, and an MCP server for Claude Code, Cursor, and any MCP client.

Browse Marketplace  |   x402 Protocol  |   SDK Docs

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Install

Claude Code

claude plugins marketplace add Dexter-DAO/opendexter-ide
claude plugins install opendexter

Cursor

npx @dexterai/opendexter install --client cursor

Or add manually to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "opendexter": {
      "command": "npx",
      "args": ["-y", "@dexterai/opendexter"]
    }
  }
}

Any MCP Client

npx @dexterai/opendexter

Add this to your client's MCP config:

{
  "mcpServers": {
    "opendexter": {
      "command": "npx",
      "args": ["-y", "@dexterai/opendexter"]
    }
  }
}

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What This Plugin Does

This plugin ships with a real MCP server that gives your agent live tools for searching, paying for, and calling paid APIs. On top of that, it has deep SDK knowledge so the agent can help you build x402 payments into your own projects.

After installing, your agent can immediately:

• Search the Dexter Marketplace for any paid API (image generation, DeFi, analytics, AI, games — thousands of endpoints)
• Check what an API costs before paying
• Pay and call any x402 API with automatic USDC settlement
• Help you build x402 clients, servers, React apps, Stripe integrations, and access passes

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What is x402?

x402 is an open protocol for machine-to-machine payments over HTTP. When an API returns 402 Payment Required, it includes payment instructions. The client pays (USDC on Solana, Base, or other chains), and the API delivers the response. No API keys, no subscriptions, no invoices.

Dexter operates the most-used x402 facilitator at https://x402.dexter.cash, processing millions of settlements across thousands of indexed endpoints from every major x402 facilitator — Dexter, Coinbase, PayAI, and more.

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Plugin Contents

MCP Server — @dexterai/opendexter

Seven tools cover everything:

Tool	Description
x402_search	Semantic capability search over thousands of paid APIs. Returns tiered results (strong + related matches) ranked by quality, usage, and reputation.
x402_check	Preview pricing per chain without spending anything. See exactly what an API costs before committing.
x402_fetch	Call any x402 API with automatic USDC payment. Signs, pays, retries — returns the response directly with an on-chain settlement receipt.
x402_pay	Alias for x402_fetch.
x402_access	Access identity-gated endpoints with wallet proof (Sign-In-With-X).
x402_wallet	Show wallet address, USDC/SOL balances, and deposit instructions.
x402_settings	Read or update your per-call spending limit.

Two wallets are auto-created at ~/.dexterai-mcp/wallet.json on first run — one Solana, one EVM. Fund either address with USDC and your agent can start paying for APIs immediately.

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Skills (6)

Deep knowledge the agent invokes when relevant: