# Romny Cross-Venue Odds – Robinhood Prediction Market Catalog

> Romny Cross-Venue Odds – Robinhood Prediction Market Catalog is a paid API for AI agents from api.romny.dpdns.org, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-23).

Returns a paginated catalog of Robinhood prediction-market events and contracts, normalized for cross-venue comparison with Polymarket.

## Facts

- Endpoint: GET https://api.romny.dpdns.org/v1/rh/markets?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/romny-cross-venue-odds-robinhood-prediction-market-catalog-e9b8f1ed
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EZShAjkUE5XiuK3VyKK4c

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 romny-cross-venue-odds-robinhood-prediction-market-catalog-e9b8f1ed
```

Example prompt: Show me up to 100 active Robinhood prediction market contracts in the politics category so I can compare them against Polymarket.

## When to prefer this

Use this endpoint when you need a browsable, paginated catalog of Robinhood prediction-market contracts — especially when building cross-venue comparisons or arbitrage screens against Polymarket. Prefer this over the RH↔Polymarket matched-pairs endpoint when you need to discover or enumerate all available Robinhood contracts rather than only those already matched to Polymarket counterparts.

## Known failure modes

- Invalid limit value outside 1-500 range returns an error
- Invalid status enum value (not 'active' or 'all') returns a validation error
- Expired or invalid pagination cursor returns an error or empty results
- Payment failure via x402 protocol results in 402 response blocking data access
- Network timeout if the upstream Robinhood data source is unavailable

## How this service works

Robinhood prediction-market event/contract catalog (normalized)

## Output

Returns a paginated list of normalized Robinhood prediction-market event and contract records, including contract IDs (usable as pagination cursors), statuses, and category labels, structured for cross-venue comparison with Polymarket data.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "string",
       "description": "Max contracts (1-500, default 50)"
      },
      "cursor": {
       "type": "string",
       "description": "Optional pagination cursor (contract_id)"
      },
      "status": {
       "enum": [
        "active",
        "all"
       ],
       "type": "string",
       "description": "active or all"
      },
      "category": {
       "type": "string",
       "description": "Optional category filter (substring)"
      }
     }
    }
   },
   "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/romny-cross-venue-odds-robinhood-prediction-market-catalog-e9b8f1ed/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.romny.dpdns.org](https://www.zero.xyz/host/api.romny.dpdns.org/llms.txt)