# Earn Shop – Pay-per-Download Fact PDF

> Earn Shop – Pay-per-Download Fact PDF is a paid API for AI agents from 46-225-73-168.sslip.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Delivers a pay-gated PDF document (fact sheet) via a micropayment of $0.05 USDC on Base using the x402 protocol or a direct USDC transfer.

## Facts

- Endpoint: POST https://46-225-73-168.sslip.io/buy/fact
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/earn-shop-pay-per-download-fact-pdf-8c7895d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_uXK2uLg6BzZbEAIbNES7f

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 earn-shop-pay-per-download-fact-pdf-8c7895d3 -d '<json body>'
```

Example prompt: Can you buy and download the fact PDF from Earn Shop for me? Pay the $0.05 USDC fee on Base using the x402 payment payload I have ready.

## When to prefer this

Choose this endpoint when you need to programmatically purchase and retrieve a specific PDF document gated behind a $0.05 USDC micropayment on Base, and you are already integrated with the x402 payment protocol or have a raw USDC transaction hash. Prefer this over free content APIs when the document is exclusively distributed through this pay-per-download channel.

## Known failure modes

- Invalid or malformed x402 payment payload — payment not accepted, document not delivered
- Transaction hash not found or insufficient USDC amount — direct-transfer route rejected
- Payment settlement failure via x402 facilitator — triggers automatic refund
- Network error on Base L2 — transaction unconfirmed, delivery delayed
- Double-spend or replay of payment payload — rejected by facilitator

## How this service works

Pay-per-download PDF documents in USDC on Base via the x402 protocol. Settlement runs through the public x402 facilitator; a direct transfer + tx-hash route is also accepted. Failed delivery is refunded.

## Output

Returns the PDF document as a binary file stream. If payment settlement fails or delivery cannot be completed, the $0.05 USDC payment is refunded to the sender.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "tx": {
   "type": "string",
   "description": "Direct-transfer route: tx hash of a USDC transfer to payTo covering the price"
  },
  "xpayment": {
   "type": "string",
   "description": "x402 payment payload (base64 JSON), same as the X-PAYMENT/PAYMENT-SIGNATURE header"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "string",
 "format": "binary"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/earn-shop-pay-per-download-fact-pdf-8c7895d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 46-225-73-168.sslip.io](https://www.zero.xyz/host/46-225-73-168.sslip.io/llms.txt)