# Would Pay Again – Book Sponsor Slot 3

> Would Pay Again – Book Sponsor Slot 3 is a paid API for AI agents from wouldpayagain.com, paid per call via x402, $1.5/call, status unknown (last checked 2026-10-12).

Books a paid advertising sponsorship slot (slot #3) in the Would Pay Again newsletter about the x402 machine-payments economy, paying $1.50 USDC via x402 on Base.

## Facts

- Endpoint: POST https://wouldpayagain.com/api/ads/book/sponsor-3?utm_source=zero.xyz
- Price: $1.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/would-pay-again-book-sponsor-slot-3-9f6b91bd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7MC0TkHhvlBYYWi_M7av4

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 would-pay-again-book-sponsor-slot-3-9f6b91bd -d '<json body>'
```

Example prompt: Book a sponsorship in the Would Pay Again newsletter — it's the x402 machine-payments one — and submit our ad content as a JSON POST body so it goes into pending review for slot 3.

## When to prefer this

Choose this endpoint when you specifically want to purchase advertising sponsorship slot #3 in the Would Pay Again newsletter, targeting an audience interested in x402 machine payments and USDC/Base blockchain. Ideal for crypto projects, AI agent tooling companies, or payment infrastructure providers wanting to reach an audience of x402 adopters. This is the only newsletter endpoint that processes real micropayments via x402 for advertising placement.

## Known failure modes

- Payment of $1.50 USDC not received or x402 payment header missing — request rejected with 402
- Slot 3 already fully booked — booking fails or returns conflict error
- Invalid body format or missing required fields — returns validation error
- On-chain settlement transaction fails — confirmed may be false and booking not finalized
- Network or API downtime — 5xx error returned

## How this service works

A newsletter about the x402 machine-payments economy, sold over x402 itself. USDC on Base.

## Output

Returns a JSON object confirming the booking with: ok (boolean), status ('pending_review'), confirmed (boolean), booking_id (integer), a tearsheet URL for the booked ad, and the on-chain settlement transaction hash on Base.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "status": "pending_review",
  "confirmed": true,
  "tearsheet": "https://wouldpayagain.com/api/ads/booking/6",
  "booking_id": 6,
  "settlement_tx": "0x…"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/would-pay-again-book-sponsor-slot-3-9f6b91bd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from wouldpayagain.com](https://www.zero.xyz/host/wouldpayagain.com/llms.txt)