# RedBTC Models List

> RedBTC Models List is a paid API for AI agents from redbtco.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-12).

Lists the two available RedBTC fixed-price AI chat models (redbtc/gpt-5.5 and redbtc/gpt-5.4-mini) for selection before routing a chat request.

## Facts

- Endpoint: GET https://redbtco.com/x402/redbtc/models?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/redbtc-models-list-b4a91256
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pCk0DEGO0jkPWsZcqSrYN

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 redbtc-models-list-b4a91256
```

Example prompt: Show me the list of available RedBTC AI models so I can pick between gpt-5.5 and gpt-5.4-mini before sending my chat request.

## When to prefer this

Use this endpoint when an agent needs to discover or confirm which RedBTC chat models are available before selecting a chat route. Prefer this over hardcoding model IDs to ensure the correct identifiers are used, especially when deciding between cost (gpt-5.4-mini) and capability (gpt-5.5).

## Known failure modes

- Payment of $0.001 USDC not fulfilled — returns 402 Payment Required
- Network or server error on redbtco.com — returns 5xx
- Invalid request format — returns 4xx

## How this service works

List the RedBTC fixed-price gpt-5.6-luna model. Use before choosing a chat route.

## Output

Returns a list of the two RedBTC fixed-price agent models: redbtc/gpt-5.5 (strong chat route) and redbtc/gpt-5.4-mini (cheapest chat route), with their identifiers and relevant metadata for routing decisions.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/redbtc-models-list-b4a91256/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from redbtco.com](https://www.zero.xyz/host/redbtco.com/llms.txt)