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Would Pay Again – Book Classified Ad #4
x402
Would Pay Again – Book Classified Ad #4 is a paid API for AI agents from wouldpayagain.com, paid per call via x402, $0.7/call, status unknown (last checked 2026-10-29).
Books a classified advertisement slot (slot #4) in the Would Pay Again newsletter about machine payments, paying $0.70 USDC via x402 on Base.
Price / call$0.7
Success—
StatusUnknown
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: a boolean 'ok' field, a 'status' of 'pending_review', a 'confirmed' boolean, a 'tearsheet' URL for reviewing the ad placement, a numeric 'booking_id', and the on-chain 'settlement_tx' hash from the USDC payment on Base.
Example use cases
Promoting an x402-powered API
“I want to advertise my new x402-gated API in the Would Pay Again newsletter — book classified slot #4, pay the $0.70 USDC, and send my ad copy as JSON so I can see the tearsheet once it's confirmed.”
Reaching machine-payments early adopters
“Book a classified ad in Would Pay Again for my USDC payment widget — submit the ad details as a JSON body to slot #4, pay with USDC on Base, and give me the booking ID and settlement transaction hash.”
Agent autonomously buying newsletter ad space
“Autonomously reserve classified ad slot #4 in the Would Pay Again machine-payments newsletter, pay the $0.70 USDC fee via x402 on Base, and return the tearsheet URL so I can review the placement.”
Technical details
Endpoint
POSThttps://wouldpayagain.com/api/ads/book/classified-4?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to purchase a specific classified advertising slot (#4) in the Would Pay Again newsletter targeting the x402 and machine-payments crypto audience, and can pay $0.70 USDC via the x402 protocol on Base. Prefer this over generic ad networks when the goal is reaching developers and early adopters specifically interested in machine payments, autonomous agent commerce, or USDC/Base ecosystem products.
Side effects
- Payment failure: insufficient USDC balance or x402 payment not accepted — booking not created
- Invalid body: missing required fields (type, method, bodyType, body) returns validation error
- Slot unavailable: classified slot #4 may already be booked for the target issue
- Network error: Base blockchain congestion causing settlement_tx delay or timeout
- Malformed request: wrong bodyType enum value or unsupported HTTP method causes rejection
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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