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docs: salvage x402 payment skill update

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skills/agent-payment-x402/SKILL.md
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---
name: agent-payment-x402
description: Add x402 payment execution to AI agents — per-task budgets, spending controls, and non-custodial wallets via MCP tools. Use when agents need to pay for APIs, services, or other agents.
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 autonomous 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.
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 mainnet is the production path called out by the original skill.
- OKX Payments / X Layer: current seller docs target X Layer (`eip155:196`) and USDT0 settlement. Fetch current SDK docs before generating production code because payment packages and facilitator behavior can change quickly.
## How It Works
### x402 Protocol
x402 extends HTTP 402 (Payment Required) into a machine-negotiable flow. When a server returns `402`, the agent's payment tool automatically negotiates price, checks budget, signs a transaction, and retries — no human in the loop.
x402 extends HTTP 402 (Payment Required) into a machine-negotiable flow. When a server returns `402`, the agent's payment tool negotiates price, checks budget, signs a transaction, and retries only inside the policy and confirmation boundary set by the orchestrator.
### Spending Controls
Every payment tool call enforces a `SpendingPolicy`:
@ -33,6 +52,8 @@ The payment layer exposes standard MCP tools that slot into any Claude Code or a
> **Security note**: Always pin the package version. This tool manages private keys — unpinned `npx` installs introduce supply-chain risk.
### Option A: agentwallet-sdk (Base / multi-chain)
```json
{
"mcpServers": {
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> **Note**: Spending policy is set by the **orchestrator** before delegating to the agent — not by the agent itself. This prevents agents from escalating their own spending limits. Configure policy via `set_policy` in your orchestration layer or pre-task hook, never as an agent-callable tool.
### Option B: OKX Agent Payments Protocol (X Layer)
Use this path for X Layer x402, Multi-Party Payment (MPP), session payment, charge, and A2A charge flows.
For buyer-side agent flows:
1. Install or reference the current `okx/onchainos-skills` repository.
2. Use `skills/okx-agent-payments-protocol/SKILL.md` as the dispatcher.
3. Treat `skills/okx-x402-payment/SKILL.md` as a deprecated compatibility alias, not as the canonical skill.
4. Require explicit user confirmation before wallet status checks or payment actions. Do not hide payment execution behind a generic tool call.
For seller-side API flows, fetch the latest language-specific guide before generating code:
| Runtime | Current guide |
|---------|---------------|
| TypeScript | `https://raw.githubusercontent.com/okx/payments/main/typescript/SELLER.md` |
| Go | `https://raw.githubusercontent.com/okx/payments/main/go/x402/SELLER.md` |
| Rust | `https://raw.githubusercontent.com/okx/payments/main/rust/x402/SELLER.md` |
| Java | `https://raw.githubusercontent.com/okx/payments/main/java/SELLER.md` |
Do not copy examples from older docs without checking the current OKX repository. Current OKX guidance uses `okx-agent-payments-protocol` as the dispatcher, and Java seller docs are now available.
## Examples
### Budget enforcement in an MCP client
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- **npm**: [`agentwallet-sdk`](https://www.npmjs.com/package/agentwallet-sdk)
- **Merged into NVIDIA NeMo Agent Toolkit**: [PR #17](https://github.com/NVIDIA/NeMo-Agent-Toolkit-Examples/pull/17) — x402 payment tool for NVIDIA's agent examples
- **Protocol spec**: [x402.org](https://x402.org)
- **OKX Payments SDKs**: [`okx/payments`](https://github.com/okx/payments) — TypeScript, Go, Rust, and Java seller integrations for X Layer x402
- **OKX Agent Payments Protocol skill**: [`okx/onchainos-skills`](https://github.com/okx/onchainos-skills/tree/main/skills/okx-agent-payments-protocol)
- **OKX Payments overview**: [web3.okx.com/onchainos/dev-docs/payments/overview](https://web3.okx.com/onchainos/dev-docs/payments/overview)