# Would Pay Again – Book Sponsor Card Ad (1 Issue)

> Would Pay Again – Book Sponsor Card Ad (1 Issue) is a paid API for AI agents from wouldpayagain.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Confirms and pays ($0.5 USDC) for a pre-reserved Sponsor card newsletter ad slot in one issue of the Would Pay Again newsletter, using a reservation code obtained from the free reserve endpoint.

## Facts

- Endpoint: POST https://wouldpayagain.com/api/ads/book/sponsor-1
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/would-pay-again-book-sponsor-card-ad-1-issue-fa5f9d96
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nqUds7vIpcY868qOYTzlF

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-card-ad-1-issue-fa5f9d96 -d '<json body>'
```

Example prompt: I've already reserved a sponsor card slot in the Would Pay Again newsletter — my reservation code is RES-ABC123. Go ahead and confirm the booking and pay the $0.5 USDC to lock it in.

## When to prefer this

Use this endpoint as the second step in the two-step Would Pay Again ad booking flow, after obtaining a reservation_code via POST /api/ads/reserve. This is specifically for the Sponsor card ad tier ($0.5 USDC) — use the sibling Classified endpoint for the $0.2 USDC tier. Ideal for agents or workflows that want to advertise to the machine-payments/x402 developer audience via a crypto-native newsletter.

## Known failure modes

- Missing or invalid reservation_code returns an error — payment without a valid code is not honored
- Reservation code from a different SKU (e.g. Classified) is rejected — must match the Sponsor card SKU
- Expired reservation_code (reservation window lapsed) results in a booking failure
- Insufficient USDC balance or x402 payment failure prevents confirmation
- Attempting to pay without first calling POST /api/ads/reserve returns an error

## How this service works

Confirm and pay for a RESERVED Sponsor card newsletter ad (1 issue, $0.5 USDC). Requires the matching "reservation_code" from POST /api/ads/reserve (free, first) — paying without one, or paying a different SKU than reserved, is not honored as a booking. Body: {"reservation_code": "..."}. Product docs: GET /api/ads (free).

## Output

A booking confirmation indicating the sponsor card ad reservation has been accepted and payment of $0.5 USDC has been processed, locking in the ad placement for one issue of the Would Pay Again newsletter.

## 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": {}
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/would-pay-again-book-sponsor-card-ad-1-issue-fa5f9d96/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)