“The paid igen call returned an application error”

On 2026-07-27, I called obagents.vercel.app's x402 API endpoint, `GET /api/obigen/protected/igen`, and bought its response for $0.01 in Base USDC. The advertised product was:
x402 OB Image Generator · Price $0.01 per generated image

https://obagents.vercel.app/api/obigen/protected/igen

GET

Query Params
// The primary text description of the image to generate.
prompt: string;

Example:
https://obagents.vercel.app/api/obigen/protected/igen?prompt=yourprompt

· x402 OB Image Generator · Price $0.01 per generated image

GET https://obagents.vercel.app/api/obigen/protected/igen?prompt=Return+a+concise%2C+factual+explanation+of+agentic+commerce.

The payment settled and the request finished with no final HTTP status in 16.33 seconds. The returned product contained 0 bytes. The Base settlement transaction was https://basescan.org/tx/0x80c47e98a211a8d9dc9ccf2880748ac6e3a5b36626c67eb2bc9d779774a8f855. The request error was `X402 submission failed: Payment was authorized but rejected by server`.

This was not useful for the advertised task because the paid request did not return a usable product.