Implements USDC x402 payments via PayAI (EIP-3009) and DHM x402 payments via EVVM native (signed pay). Use when adding x402 payment flows, PayAI Echo integration, EVVM pay() for DHM, agent-to-agent payments with Privy, or when the user asks how to do USDC/DHM x402 in the ClawHub/NHS EVVM app.
请根据来源仓库和你的 AI 工具说明安装此技能。先阅读技能文件和依赖要求，再添加到工作流。
SkillHub CLI
skillhub install arunnadarasa/digitalhealth打开来源仓库，查看说明和兼容环境后，按来源提供的命令或步骤安装。
将来源链接提供给你的 Agent，让它先读取说明、核对依赖，并向你说明将执行的安装步骤。
This skill documents the two x402 payment flows in the NHS EVVM / ClawHub app: USDC via PayAI Echo and DHM via EVVM native. Reference implementation lives in this repo.
| Flow | Client UI | Server / config |
|---|---|---|
| USDC (PayAI) | frontend/src/components/sections/USDCX402TestSection.tsx |
Config: frontend/src/config/contracts.ts (X402_USDC_ECHO_URL, USDC_BASE_SEPOLIA) |
| DHM (EVVM) | frontend/src/components/sections/X402TestSection.tsx |
server/src/index.ts (GET 402, POST /payments/evvm/dhm) |
| EVVM sign | frontend/src/lib/evvmSign.ts |
— |
Chain: Base Sepolia (chainId 84532).
PayAI returns 402 with an accepts array (not options). Client picks a USDC option, builds EIP-3009 TransferWithAuthorization, signs EIP-712, sends signature in PAYMENT-SIGNATURE header, retries the same URL; server returns 200 and may set PAYMENT-RESPONSE header with result (e.g. transaction hash).
Request resource
GET <Echo URL> (e.g. https://x402.payai.network/api/base-sepolia/paid-content).
Parse 402
PAYMENT-REQUIRED response header (base64-encoded JSON).accepts array.{ x402Version?, error?, resource?, accepts: Array<{ scheme, network, amount, asset, payTo, maxTimeoutSeconds?, extra? }> }.Pick USDC option
accepts, choose entry where asset matches USDC on Base Sepolia or extra.name === "USDC".amount, asset, payTo, extra.name / extra.version for EIP-712.Build EIP-3009 authorization
name = extra?.name ?? "USDC", version = extra?.version ?? "2", chainId = 84532, verifyingContract = asset.TransferWithAuthorization: from, to, value, validAfter (0), validBefore (e.g. now...这些信息来自收录时的来源分析，可能滞后；使用前请核对最新来源文件。
# ClawHub x402 Payments (USDC via PayAI + DHM via EVVM)
This skill documents the two x402 payment flows in the NHS EVVM / ClawHub app: **USDC via PayAI Echo** and **DHM via EVVM native**. Reference implementation lives in this repo.
## Reference paths
| Flow | Client UI | Server / config |
|------|-----------|------------------|
| USDC (PayAI) | `frontend/src/components/sections/USDCX402TestSection.tsx` | Config: `frontend/src/config/contracts.ts` (X402_USDC_ECHO_URL, USDC_BASE_SEPOLIA) |
| DHM (EVVM) | `frontend/src/components/sections/X402TestSection.tsx` | `server/src/index.ts` (GET 402, POST /payments/evvm/dhm) |
| EVVM sign | `frontend/src/lib/evvmSign.ts` | — |
Chain: **Base Sepolia** (chainId 84532).
---
## Flow 1: USDC x402 via PayAI Echo
PayAI returns **402** with an `accepts` array (not `options`). Client picks a USDC option, builds EIP-3009 `TransferWithAuthorization`, signs EIP-712, sends signature in `PAYMENT-SIGNATURE` header, retries the same URL; server returns 200 and may set `PAYMENT-RESPONSE` header with result (e.g. `transaction` hash).
### Client steps
1. **Request resource**
`GET <Echo URL>` (e.g. `https://x402.payai.network/api/base-sepolia/paid-content`).
2. **Parse 402**
- Prefer `PAYMENT-REQUIRED` response header (base64-encoded JSON).
- Fallback: response body may be JSON with `accepts` array.
- Type: `{ x402Version?, error?, resource?, accepts: Array<{ scheme, network, amount, asset, payTo, maxTimeoutSeconds?, extra? }> }`.
3. **Pick USDC option**
- From `accepts`, choose entry where `asset` matches USDC on Base Sepolia or `extra.name === "USDC"`.
- Use `amount`, `asset`, `payTo`, `extra.name` / `extra.version` for EIP-712.
4. **Build EIP-3009 authorization**
- Domain: `name` = `extra?.name ?? "USDC"`, `version` = `extra?.version ?? "2"`, `chainId` = 84532, `verifyingContract` = `asset`.
- Type: `TransferWithAuthorization`: `from`, `to`, `value`, `validAfter` (0), `validBefore` (e.g. now...Bambu Lab 3D printer control and automation. Activate when user mentions: printer status, 3D printing, slice, analyze model, generate 3D, AMS filament, print monitor, Bambu Lab, or any 3D printing task. Full pi...
OpenClaw Skill for stock data analysis
Generative Engine Optimization (GEO) for AI search visibility. Optimize content to appear in ChatGPT, Perplexity, Claude, and Google AI Overviews. Use when optimizing websites, pages, or content for LLM discove...
Agents can sign plugins, rotate credentials without losing identity, and publicly attest to behavior.