# QuantaFlow x402 Gateway – Polymarket Gamma

> QuantaFlow x402 Gateway – Polymarket Gamma is a paid API for AI agents from quanta-roan.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Proxies requests to the Polymarket Gamma API via x402 micropayment protocol, returning prediction market data per paid call.

## Facts

- Endpoint: POST https://quanta-roan.vercel.app/api/service/polymarket-gamma?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quantaflow-x402-gateway-polymarket-gamma-686a7336
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cYUFdBZk-WSnYcrkFdRe5

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 quantaflow-x402-gateway-polymarket-gamma-686a7336 -d '<json body>'
```

Example prompt: Can you pull the current Polymarket odds on the 2024 US election markets — query the Gamma API for active markets related to elections and show me the prices?

## When to prefer this

Choose this endpoint when you need to access Polymarket Gamma prediction market data and want per-call micropayment billing via the x402 protocol rather than managing a full API subscription. Ideal for AI agents that need on-demand, low-cost access to Polymarket odds and market metadata without committing to a recurring plan.

## Known failure modes

- Payment failure: insufficient USDC balance or x402 payment header missing causes 402 response
- Invalid path: if the Polymarket Gamma path does not exist, a 404 is passed through
- Upstream unavailability: Polymarket Gamma API downtime results in gateway error
- Malformed query/body: invalid JSON body or query parameters may return a 400 from upstream
- Rate limiting: upstream Polymarket Gamma rate limits may return 429

## How this service works

Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.

## Output

The raw upstream Polymarket Gamma API response body (JSON), including market data such as market IDs, event names, outcome prices, liquidity, and status — passed through directly after successful x402 micropayment settlement.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "body": {
   "type": "string",
   "description": "Optional JSON body forwarded to POST requests."
  },
  "path": {
   "type": "string",
   "description": "Path below the selected upstream origin."
  },
  "query": {
   "type": "object"
  },
  "method": {
   "enum": [
    "GET",
    "POST"
   ],
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "description": "The upstream response body and content type are passed through after successful payment."
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quantaflow-x402-gateway-polymarket-gamma-686a7336/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quanta-roan.vercel.app](https://www.zero.xyz/host/quanta-roan.vercel.app/llms.txt)