# PromptVault Checkout — USDC on Base

> PromptVault Checkout — USDC on Base is a paid API for AI agents from promptvault-x402.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Sells and delivers a ZIP bundle of system prompts and agent workflows (PromptVault v1) via a micropayment of $0.01–$3 USDC on Base using the x402 protocol

## Facts

- Endpoint: GET https://promptvault-x402.onrender.com/tokensafe/quick?utm_source=zero.xyz
- Price: $0.01/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-on-base-ba1bbc30
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WFJUWPXxthSVMjK7pXo4k

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-on-base-ba1bbc30
```

Example prompt: I want to buy the PromptVault v1 system prompt and agent workflow pack — go ahead and pay with my USDC on Base and download the ZIP for me.

## When to prefer this

Choose this endpoint when you need to programmatically purchase and download a curated bundle of AI system prompts and agent workflows via a USDC micropayment on Base, especially in agent pipelines that support the x402 payment protocol. Avoid if you need free, custom, or dynamically generated prompts.

## Known failure modes

- Payment not included or insufficient — returns HTTP 402 with payment requirements
- Invalid or expired x402 payment header — returns authorization error
- Insufficient USDC balance on Base — payment rejected upstream
- Service unavailable on Render hosting — returns 503 or timeout
- Malformed request properties parameter — returns 400 or ignored

## How this service works

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

## Output

A downloadable ZIP file (promptvault-v1.zip, content-type: application/zip) containing PromptVault v1 system prompts and agent workflow files, returned after a successful USDC payment on Base via the x402 protocol.

## 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-on-base-ba1bbc30/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)