# fold · x402 — GPT-5.5 Pro Market Intelligence

> fold · x402 — GPT-5.5 Pro Market Intelligence is a paid API for AI agents from x402.fold.computer, paid per call via x402, $2/call, status down (last checked 2026-09-15).

Runs OpenAI-format chat completions via GPT-5.5 Pro, specialized for machine-readable onchain market intelligence, gated by x402 micropayment.

## Facts

- Endpoint: POST https://x402.fold.computer/llm/gpt-5-5-pro
- Price: $2/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fold-x402-gpt-5-5-pro-market-intelligence-325fd3ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_R312fN-zSlsFsHmsb9XCU

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 fold-x402-gpt-5-5-pro-market-intelligence-325fd3ce -d '<json body>'
```

Example prompt: Using fold's x402 GPT-5.5 Pro endpoint, ask: 'What are the current market trends for ETH/USDC liquidity pools on major DEXes, and what risks should an onchain agent watch for right now?' — set max_tokens to 512 and temperature to 0.3 for a focused, deterministic answer.

## When to prefer this

Choose this endpoint when your agent needs onchain-native LLM inference gated by a crypto micropayment (x402/USDC), particularly for market intelligence tasks in DeFi or Web3 contexts. Prefer it over standard OpenAI APIs when you want pay-per-call crypto billing without API key management, or when composing onchain agent workflows that require a monetized AI reasoning step. Best suited for agents already operating in x402-compatible payment environments.

## Known failure modes

- Payment not included or insufficient USDC — returns 402 Payment Required before processing
- Invalid or malformed messages array — returns 400 Bad Request
- Model overload or upstream OpenAI outage — returns 503 or timeout
- Temperature or max_tokens out of range — may return 422 Unprocessable Entity
- Network or x402 facilitator failure — payment may be deducted but response not returned

## How this service works

Machine-readable market intelligence for onchain agents, served over x402.

## Output

An OpenAI-format chat completion object containing the model's response (market intelligence, analysis, or reasoning output) along with x402 cost metadata and a status field. The data payload mirrors standard OpenAI chat completion structure, so agents can parse it with existing tooling.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "messages"
 ],
 "properties": {
  "messages": {
   "type": "array",
   "description": "OpenAI-format chat messages"
  },
  "max_tokens": {
   "type": "number"
  },
  "temperature": {
   "type": "number"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "status",
  "data"
 ],
 "properties": {
  "data": {
   "type": "object",
   "description": "OpenAI-format completion + x402 cost info"
  },
  "status": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fold-x402-gpt-5-5-pro-market-intelligence-325fd3ce/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.fold.computer](https://www.zero.xyz/host/x402.fold.computer/llms.txt)