# Free sample: Change order teaser

_Delta table snippet only. Full top-up math + accept/reject paste + escrow memo: POST /v0/change-order → 0.012 USDC_

## Demo delta (truncated)

```
| # | Change | Allocated top-up | Gate |
|---|--------|------------------|------|
| D1 | Add competitor matrix | +5 USDC | paid top-up required |
| D2 | Add 2-page GTM checklist | +5 USDC | paid top-up required |
| D3 | Translate summary to…
```

## Upgrade — full mid-job change order
```http
POST https://x402.devvizion.com/v0/change-order
Content-Type: application/json
{ "brief":"…", "change":"Add competitor matrix; …", "reward":12, "hours":3, "platform":"taskmarket", "wallet":"0x…" }
```
Pay with x402 on Base USDC · unpaid → HTTP 402 · 0.012 USDC
payTo 0xE79e7fa7Ce7259C46F9B127b837d2907Bb036F95