agent-payment-x402

What this skill does

When applied, it prepends a system prompt before your request is sent — no extra calls and no change to how you are billed beyond the added tokens.

---
name: agent-payment-x402
description: Add x402 payment execution to AI agents with per-task budgets, spending controls, and non-custodial wallets. Supports Base through agentwallet-sdk and X Layer through OKX Payments / OKX Agent Payments Protocol.
origin: community
---

# Agent Payment Execution (x402)

Enable AI agents to make policy-gated payments with built-in spending controls. Uses the x402 HTTP payment protocol and MCP tools so agents can pay for external services, APIs, or other agents without custodial risk.

## When to Use

Use when: your agent needs to pay for an API call, purchase a service, settle with another agent, enforce per-task spending limits, or manage a non-custodial wallet. Pairs naturally with cost-aware-llm-pipeline and security-review skills.

## Decision Tree

Choose the integration path based on whether your agent is buying access to a paid API or charging others for one:

| Need | Recommended path |
|------|------------------|
| Agent pays a 402-gated API on Base or another agentwallet-supported chain | Use `agentwallet-sdk` as an MCP payment server with strict spending policy |
| Agent pays a 402-gated API on X Layer | Use OKX Agent Payments Protocol from `okx/onchainos-skills`; `okx-x402-payment` is a deprecated legacy alias |
| TypeScript API charges agents | Use OKX Payments TypeScript seller SDK docs for Express, Hono, Fastify, or Next.js |
| Go API charges agents | Use OKX Payments Go seller SDK docs for Gin, Echo, or `net/http` |
| Rust API charges agents | Use OKX Payments Rust seller SDK docs for Axum |
| Java API charges agents | Use OKX Payments Java seller SDK docs for Spring Boot 2/3, Java EE, or Jakarta |
| Python API charges agents | Check the current OKX Payments repository before implementation; a Python seller guide may not be available |

## Supported Networks

- `agentwallet-sdk`: use the package docs to confirm current network coverage before production. Base Sepolia is the safest development default; Base mainne

Use this skill

{
  "model": "gpt-4o-mini",
  "skill": "imp-236d12d1-f90e-4d5d-8659-71b9150c00f5",
  "messages": [{ "role": "user", "content": "…" }]
}

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