Ecosystem Tools

Complementary tools and MCP servers for the T402 ecosystem.

WDK MCP Toolkit

Tether WDK MCP Toolkit is a general-purpose wallet MCP server with 30+ tools. It complements T402’s payment-focused MCP tools.

Capability Comparison

Capability	T402 MCP	WDK MCP Toolkit
Payment protocol (402)	✅ Core	❌
Wallet management	✅ WDK tools	✅ Core
Token transfers	✅	✅
Swaps	✅	✅ + quotes
Bridges	✅	✅
Price feeds	✅	✅
Lending/borrowing	❌	✅
Fiat on/off-ramp	❌	✅
ERC-8004 identity	✅	❌
Gasless payments	✅	❌

Using Together

You can run both T402 and WDK MCP servers together in Claude Desktop. Each provides distinct capabilities:

T402 MCP — Payment negotiation, 402 protocol, ERC-8004 identity, gasless transactions
WDK MCP Toolkit — Wallet management, DeFi operations, fiat ramps

Example claude_desktop_config.json:

{
  "mcpServers": {
    "t402": {
      "command": "npx",
      "args": ["@t402/mcp"],
      "env": {
        "T402_PRIVATE_KEY": "0x...",
        "T402_WDK_SEED_PHRASE": "your twelve word seed phrase here"
      }
    },
    "wdk": {
      "command": "node",
      "args": ["/path/to/wdk-mcp-toolkit/dist/index.js"],
      "env": {
        "WDK_SEED_PHRASE": "your twelve word seed phrase here"
      }
    }
  }
}

When using both servers, the AI agent can combine capabilities — for example, using WDK for wallet balance checks and T402 for making 402 payments.

Complementary Workflows

Workflow	T402 MCP	WDK MCP Toolkit
Check wallet balance	✅ `get_balances`	✅ `getBalances`
Pay for API access	✅ `make_payment`	❌
Swap tokens	✅ `execute_swap`	✅ `swap`
Bridge cross-chain	✅ `execute_bridge`	✅ `bridge`
Verify agent identity	✅ `verify_erc8004`	❌
Check lending rates	❌	✅ `getLendingRates`
On-ramp fiat	❌	✅ `onRamp`

OpenClaw WDK Skills

OpenClaw provides Claude Code skills for WDK wallet operations. These are interactive /slash commands that guide developers through wallet management tasks.

Available Skills

Skill	Description
`/wdk-wallet`	Create and manage WDK wallets
`/wdk-transfer`	Send token transfers
`/wdk-swap`	Execute token swaps
`/wdk-bridge`	Bridge tokens cross-chain

T402 Skills

T402 also provides Claude Code skills:

Skill	Description
`/pm`	Project manager for T402 development
`/cross-sdk-check`	Verify cross-SDK consistency
`/release`	Guided release workflow

Third-Party Implementations

Project	Description	Link
x402-usdt0	Cross-chain USDT0 payment demo	GitHub
SemanticPay	Third-party x402 facilitator	Website

Tether Ecosystem

Project	Description	Link
USDT0	Omnichain USDT with EIP-3009	tether.to/usdt0
Tether WDK	Wallet Development Kit	wdk.tether.to
WDK MCP Toolkit	MCP server for wallet operations	GitHub

Standards

Standard	Purpose	Relevance
EIP-3009	Transfer with authorization	Core EVM payment mechanism
ERC-8004	Native asset transfer	Agent identity verification
MCP	Model Context Protocol	AI agent tool interface
A2A	Agent-to-Agent Protocol	Multi-agent payment coordination

Building Custom Tools

T402’s modular architecture supports custom integrations:

import { createClient } from '@t402/core';
import { evmMechanism } from '@t402/evm-exact';
 
// Create a custom payment client
const client = createClient({
  mechanisms: [evmMechanism],
  facilitatorUrl: 'https://facilitator.t402.io',
});
 
// Use in your own MCP server, API, or automation
const result = await client.pay(paymentRequirements, wallet);

See the MCP Integration guide for building custom MCP tools with T402.

Protocol Compatibility