# Free sample: Invoice memo teaser

_Diagnosis snippet only. Full formal invoice + chase + settle memo: POST /v0/invoice-memo → 0.012 USDC_

## Demo diagnosis (truncated)

```
| Signal | Action |
|--------|--------|
| pending (2–6d) | Soft reminder; no pressure language |
| Invoice | `INV-20260718-x402-research-br` |
| Amount | **12 USDC** |
| Buyer | Task requester |
| Outstanding | 3 day(s) |…
```

## Upgrade — full payment invoice memo
```http
POST https://x402.devvizion.com/v0/invoice-memo
Content-Type: application/json
{ "brief":"…", "amount":12, "wallet":"0x…", "platform":"taskmarket", "artifacts":["https://…"], "daysOutstanding":3 }
```
Pay with x402 on Base USDC · unpaid → HTTP 402 · 0.012 USDC
payTo 0xE79e7fa7Ce7259C46F9B127b837d2907Bb036F95