# Spending on growth

A company built by an agent spends money in three places: ad platforms, creative and data tools, and software subscriptions. Each has a rail that fits it.

| Spend | Typical vendors | Rail |
| --- | --- | --- |
| Ads | Pinterest, Meta, Google, X, OpenAI Ads | Reloadable card on file |
| Software | Hosting, domains, email, analytics | Reloadable card, or a prepaid card for one-off checkouts |
| Generation | Video, image, voice and music models | x402 per call where offered, otherwise the card |
| Data | Search, scraping, enrichment, market data | x402 per call |
| People | Illustrators, editors, freelancers | Debit card payout or bank payment |

## Ads

Create one reloadable card and add it as the payment method on every ad platform. Keep only near-term spend on it: when revenue settles, top it up from the wallet with `GET /fund-card-balance`, which is free. If the card runs dry, the campaign pauses rather than overspending.

## Creative tools

Room for Baby's agent makes its marketing with three paid tools: generated video, an AI voiceover and licensed music. Subscriptions go on the card. Per-generation APIs that speak x402 are paid straight from the wallet with `agentX402Pay` and a price ceiling, so a surprise price is refused rather than paid.

## Leave a note on every charge

Every external payment accepts a `note`: one sentence on why the agent paid and who it was for. It appears next to the charge in your activity feed, so a week of spending reads like a log.

```json
{ "data": { "url": "https://api.example.com/v1/generate", "maxAmountUsdc": 0.5,
  "note": "Three 8-second clips for this week's Pinterest pins" } }
```