# PromptVault — Checkout USDC Base

> PromptVault — Checkout USDC Base is a paid API for AI agents from promptvault-x402.onrender.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-17).

Delivers a downloadable ZIP of AI system prompts and agent workflow files upon USDC payment via x402 on Base

## Facts

- Endpoint: GET https://promptvault-x402.onrender.com/sample?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/promptvault-checkout-usdc-base-aeaac1d5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_PU_LihjV4SvY81toJn5TM

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability promptvault-checkout-usdc-base-aeaac1d5
```

Example prompt: Can you buy me the PromptVault v1 prompt and agent workflow pack using USDC on Base — I want to download the ZIP file with all the system prompts and workflows.

## When to prefer this

Choose this endpoint when an agent needs to programmatically purchase and retrieve a curated bundle of AI system prompts and agent workflow files using USDC stablecoin on the Base blockchain via the x402 payment protocol. Prefer this over manual marketplaces when you want a fully automated, agent-native checkout-and-download flow for digital AI assets.

## Known failure modes

- Payment not provided or insufficient — 402 Payment Required with x402 challenge
- Incorrect USDC amount sent — payment rejected
- Base network congestion causing payment confirmation delay
- Render.com hosting downtime — 503 Service Unavailable
- Invalid or missing x402 payment header — request rejected without content delivery

## How this service works

Prompt + agent workflow pack sold via x402 (USDC on Base)

## Output

Returns a JSON response containing the filename ('promptvault-v1.zip'), content type ('application/zip'), and a description confirming the ZIP of PromptVault v1 system prompts and agent workflows after a 3 USDC Base payment. The agent can then download or store the ZIP file.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "filename": "promptvault-v1.zip",
  "contentType": "application/zip",
  "description": "ZIP of PromptVault v1 system prompts and agent workflows after 3 USDC Base payment"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/promptvault-checkout-usdc-base-aeaac1d5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from promptvault-x402.onrender.com](https://www.zero.xyz/host/promptvault-x402.onrender.com/llms.txt)