---
url: "https://predictiontoolkit.com/tools/oddspipe/"
publisher: "PredictionToolkit"
dateModified: "2026-11-02"
---

[← Data APIs](<https://predictiontoolkit.com/polymarket-api/>) 

![OddsPipe logo](<https://predictiontoolkit.com/assets/logo-tool-oddspipe-3968bb05045f.svg>)

Data API

# OddsPipe: Polymarket and Kalshi Matched-Market API

OddsPipe is a comparison API for Polymarket and Kalshi contracts. It returns matched pairs, confidence scores and price differences alongside search and individual market details.

[**3.5**/ 5Editorial rating](<https://predictiontoolkit.com/tools/oddspipe/#reviews>) [Editorial assessment](<https://predictiontoolkit.com/tools/oddspipe/#reviews>) 

[Open OddsPipe](<https://oddspipe.com/>) oddspipe.com

**Available on:** API

**Pricing:** Free supports evaluation; paid tiers target production volume and redistribution.

[Screenshots](<https://predictiontoolkit.com/tools/oddspipe/#screenshots>) [Explore alternatives](<https://predictiontoolkit.com/tools/oddspipe/#alternatives>) 

[Data APIs](<https://predictiontoolkit.com/polymarket-api/>) [Arbitrage](<https://predictiontoolkit.com/polymarket-arbitrage-tools/>) 

## Screenshots and interface

Product preview1 / 2

Introduction to contract matching and spreads.

## What is OddsPipe?

Use a minimum-spread query to narrow a research set, then discard weak matches and inspect both contract definitions. Confidence rates the match, not whether either order will fill.

The homepage describes one-minute resolution rather than tick-by-tick execution data. Depth, fees and settlement differences can alter the apparent spread. A free tier supports evaluation; production volume and redistribution need the appropriate paid plan.

### Who it is for

-   Developers building cross-venue comparison screens.
-   Researchers checking Polymarket and Kalshi questions.
-   Python users seeking a short integration.

## Features and coverage

-   **Matched pairs**
    
    Retrieve linked contracts across the two venues.
    
-   **Confidence**
    
    Filter pairs by the supplied match score.
    
-   **Spread queries**
    
    Apply a minimum price difference.
    
-   **Search**
    
    Search text and filter venue or status.
    
-   **Market details**
    
    Read a market and its latest price.
    
-   **Python or REST**
    
    Use oddspipe or direct HTTP with X-API-Key.
    

## Workflows with OddsPipe

### Build a shortlist

Query spreads, filter weak matches and read both rule sets. Check current bids/asks, depth and fees separately.

### Track a contract

Resolve its OddsPipe ID, read details and request its cross-platform spread.

### Export research

Keep paired IDs, confidence and observed prices together for a bounded topic.

## Pricing and total cost

Free supports evaluation; paid tiers target production volume and redistribution.

### Free

$0/month

-   Evaluation and side projects

### Build

$49/month

-   Solo production builders

### Launch

$99/month

-   Growing apps and teams

### Scale

$299/month

-   High volume and redistribution

## Getting started

**Before you start:** Match confidence does not establish fillability.

1.  Register by email and obtain an API key.
2.  Install oddspipe or prepare direct HTTP.
3.  Make a small search or spread query.
4.  Retain both contracts and match confidence.
5.  Review quotas before repeated scans.

One-minute resolution is not a tick-by-tick execution feed.

## Useful links

-   [View OddsPipe pricing](<https://oddspipe.com/pricing>) 

### What to check

-   Match confidence does not establish fillability.
-   Displayed spreads omit the full impact of depth, fees and settlement differences.
-   Redistribution requirements affect plan choice.

A closer look

## Ratings & reviews

Editorial rating

**3.5**/ 5

0 user reviews

PredictionToolkit editorial

### Our take on OddsPipe

Matched contracts and confidence filters provide a focused API. Minute-level observations and incomplete execution costs require further analysis of quoted spreads.

Based on documented features, setup and access terms. [How we rate](<https://predictiontoolkit.com/methodology/>) 

### User reviews 0

The main score switches to user ratings after 5 published reviews.

**Be the first to share your experience**

A specific example helps the next person choose the right tool.

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## Frequently asked questions about OddsPipe

### Which venues are matched?

Polymarket and Kalshi.

### Can I filter uncertain matches?

Yes. Use the confidence score.

### Is every spread executable arbitrage?

No. Inspect rules, current bids and asks, depth and fees.

### Is Python required?

No. Call REST directly with an API key.

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