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Would Pay Again – Book Sponsor Card Ad (1 Issue)
x402
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 2026-10-29).
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.
Price / call$0.5
Success—
StatusUnknown
How this service works
A newsletter about the x402 machine-payments economy, sold over x402 itself. USDC on Base.
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.
Example use cases
Locking in a newsletter ad campaign
“I reserved a sponsor card ad in Would Pay Again earlier — the reservation code is RES-XYZ789. Please finalize the booking and pay the 50-cent USDC fee to secure my slot.”
Automating ad purchases for a product launch
“We just got a reservation code LAUNCH-001 for a sponsor spot in the Would Pay Again x402 newsletter. Can you complete the payment and confirm the booking so our ad goes in the next issue?”
Agent-driven B2B advertising workflow
“My team reserved a Would Pay Again sponsor card using reservation code CAMP-2024A. Confirm the booking by paying the $0.5 USDC now so we're locked in for that issue.”
Technical details
Endpoint
POSThttps://wouldpayagain.com/api/ads/book/sponsor-1?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"status": "pending_review",
"confirmed": true,
"tearsheet": "https://wouldpayagain.com/api/ads/booking/6",
"booking_id": 6,
"settlement_tx": "0x…"
}
}Tags
x402
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