# revert.wtf x402 Payment Option Selector

> revert.wtf x402 Payment Option Selector is a paid API for AI agents from revert.wtf, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Selects and confirms the accepted x402 micropayment option for a given API endpoint, enabling paid API access.

## Facts

- Endpoint: POST https://revert.wtf/api/x402/selector
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/revert-wtf-x402-payment-option-selector-e296a2b3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bp7hqU-Ufi5csQojCFFPQ

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 revert-wtf-x402-payment-option-selector-e296a2b3 -d '<json body>'
```

Example prompt: Select the accepted x402 payment option for this endpoint using selector 'usdc-base-1' so I can proceed with the paid API call.

## When to prefer this

Use this endpoint when you need to programmatically select or confirm an x402 payment option before making a call to a 402-protected API, particularly in automated agent workflows that handle USDC micropayments on the Base network via the x402 protocol.

## Known failure modes

- Invalid or unrecognized selector value returns an error
- No matching payment option found for the given selector
- x402 payment configuration not available for endpoint
- Malformed request body missing selector field
- Endpoint not configured for x402 payments

## How this service works

Paid hosted 4-byte function/error selector resolver backed by the revert.wtf selector catalog. Send a 4-byte selector such as 0x08c379a0.

## Output

Returns the confirmed accepted x402 payment option for the endpoint, allowing the caller to proceed with the appropriate micropayment and complete the API request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "selector": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/revert-wtf-x402-payment-option-selector-e296a2b3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from revert.wtf](https://www.zero.xyz/host/revert.wtf/llms.txt)