# Romny Cross-Venue Odds – Robinhood↔Polymarket Matched Contract Pairs

> Romny Cross-Venue Odds – Robinhood↔Polymarket Matched Contract Pairs is a paid API for AI agents from api.romny.dpdns.org, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-23).

Returns matched contract pairs between Robinhood and Polymarket prediction markets with a confidence score for each match

## Facts

- Endpoint: GET https://api.romny.dpdns.org/v1/rh/pm-matches?utm_source=zero.xyz
- Price: $0.1/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-polymarket-matched-contract-pairs-79b93c25
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__bvEWJcGGXhO2iSZbsBJ0

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-polymarket-matched-contract-pairs-79b93c25
```

Example prompt: Show me the top 50 Robinhood–Polymarket matched contract pairs where the confidence is at least 0.8.

## When to prefer this

Use this endpoint when you need to identify which prediction market contracts on Robinhood have a corresponding match on Polymarket, especially for cross-venue odds comparison or arbitrage analysis. Prefer this over the probability-spread endpoint when you want to discover the matched pairs themselves rather than analyze the spread between already-known pairs.

## Known failure modes

- Invalid limit value outside 1-200 range may return a validation error
- min_confidence outside 0-1 range may return a validation error
- No matches found above the specified confidence threshold returns an empty list
- Payment not included or insufficient USDC causes a 402 payment required error
- Service unavailability from upstream data sources may cause 503 errors

## How this service works

Robinhood↔Polymarket matched contract pairs with confidence

## Output

A list of matched contract pairs, each containing the Robinhood contract details, the corresponding Polymarket contract details, and a floating-point confidence score indicating how strongly the two contracts are believed to represent the same underlying event. Results are capped by the requested limit and filtered by the minimum confidence threshold.

## 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 pairs (1-200, default 50)"
      },
      "min_confidence": {
       "type": "string",
       "description": "Minimum match confidence 0-1 (default 0.6)"
      }
     }
    }
   },
   "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-polymarket-matched-contract-pairs-79b93c25/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)