AI Agent Packages

Packages for enabling AI agent payments, transport, policy, and observability.

@t402/mcp — MCP Server

Model Context Protocol (MCP) server for AI agent payments. 32+ tools for Claude, Codex, Gemini.

Installation

npm install @t402/mcp

Tools

Core Payment

• t402/getBalance — Token balances on a network
• t402/getAllBalances — Balances across all networks
• t402/pay — Execute stablecoin payment
• t402/payGasless — Pay without gas (ERC-4337)
• t402/autoPay — Smart auto-payment (handle 402 automatically)

Bridge & Swap

• t402/bridge — Cross-chain USDT0 transfer
• wdk/swap — Token swap via DEX

AI Agent

• erc8004/resolveAgent — Agent identity lookup
• erc8004/checkReputation — Reputation score query
• t402/searchBazaar — Discover paid services

Pricing

• t402/getTokenPrice — Current token prices
• t402/getHistoricalPrice — OHLCV price data

For the full MCP integration guide, see MCP Integration.

@t402/a2a — Agent-to-Agent Transport

Agent-to-Agent (A2A) transport for inter-agent commerce using the Google A2A protocol.

Installation

npm install @t402/a2a

Features

• A2A protocol integration for agent-to-agent payments
• Task-based payment lifecycle
• Agent discovery and capability declaration
• Service negotiation and pricing

@t402/policy — Payment Policy Engine

Payment policy engine for AI agent spending guardrails.

Installation

npm install @t402/policy

Usage

import { PaymentPolicyEngine } from "@t402/policy";
 
const engine = new PaymentPolicyEngine({
  maxAmountPerPayment: "1000000",    // 1 USDC max
  maxAmountPerSession: "10000000",   // 10 USDC session budget
  maxPaymentsPerHour: 100,
  allowedNetworks: ["eip155:8453"],
  blockedRecipients: ["0xEvil..."],
});
 
const decision = engine.evaluate("exact", "eip155:8453", "0xUSDC", "500000", "0xRecipient");
if (decision.allowed) {
  engine.recordPayment("500000");
}

Rules

Available in all 4 SDKs (TypeScript, Go, Python, Java).

@t402/observability — Payment Metrics

Payment event tracking, flow tracing, and Prometheus metrics export.

Installation

npm install @t402/observability

Usage

import { PaymentEventCollector, PaymentTracer, toPrometheusMetrics } from "@t402/observability";
 
const collector = new PaymentEventCollector();
const tracer = new PaymentTracer(collector);
 
tracer.startFlow("pay-001", { network: "eip155:8453" });
tracer.recordStep("pay-001", "payment.verified");
tracer.endFlow("pay-001", true);
 
const metrics = collector.getMetrics();
const prometheus = toPrometheusMetrics(metrics);

Metrics

• t402_payments_total{status} — Total by status (attempted/successful/failed)
• t402_payment_duration_seconds{phase} — Verify/settle latency
• t402_payment_amount_total{network} — Amount by network
• t402_payment_failures_total{reason} — Failure breakdown

Available in all 4 SDKs (TypeScript, Go, Python, Java).