Narwhal gives Kalshi and Polymarket odds one schema for economic releases, central bank decisions, metals and energy. Kalshi API covers all Kalshi markets and supports trading. Choose Narwhal for a shared data interface, or Kalshi for direct venue access.
Choose Narwhal for supported odds from both venues through REST and MCP. Choose Kalshi API for trading, wider Kalshi coverage and direct access to its order books.
Narwhal covers selected topics from two venues; Kalshi API covers one venue directly. Narwhal API is owned and operated by Nusantara Ventures, LLC.
| Requirement | Narwhal API | Kalshi API |
|---|---|---|
| Free tier | ✓ 5,000 requests/month | ✓ Public REST market data; no key |
| Cheapest paid plan | Basic: $59/month; $590/year available | Not published |
| Update speed | Free: previous day's close; Basic/Pro: live | WebSocket; signed authentication required |
| History | Free: 12 months; Basic: 5 years; available records only | Historical endpoints; 1-minute, hourly and daily candlesticks |
| Coverage | Kalshi/Polymarket: economics, central banks, metals, energy | All Kalshi markets |
| Interfaces | REST, MCP; Basic/Pro: WebSocket | REST and WebSocket |
| SDKs | ✓ Official Python and TypeScript SDKs | ✓ Python and TypeScript |
| Commercial use on free tier | ✓ Commercial apps; resale needs Enterprise | Not compared on this page |
No API fee found; tiered rate limits rise with account level.
| Requests per month | Narwhal API | Kalshi API |
|---|---|---|
| 1,000 | Free: $0/month | Public API: $0 |
| 10,000 | Basic: $59/month | Public API: $0 |
| 100,000 | Basic: $59/month | Public API: $0 |
List prediction topics
# Change: URL
curl --get \
"https://external-api.kalshi.com/trade-api/v2/events" \
--data-urlencode "limit=25"# Change: URL and key
curl \
"https://api.narwhalapi.com/v1/predictions/topics" \
-H "Authorization: Bearer YOUR_API_KEY"Narwhal Free includes 5,000 successful requests each month and permits commercial apps. Use that allowance for a dashboard, scheduled data fetches or an agent integration. Move to Basic for 100,000 monthly requests as usage grows, with the same account and authentication.
REST and hosted MCP reach the same data through one account. Your application can fetch JSON while an agent uses the hosted tools, with every successful call counted once against the shared allowance. One quota makes the combined workload straightforward to budget.
Narwhal gives Kalshi and Polymarket one schema for economic releases, central bank decisions, metals and energy. Events use scalar, binary, extremes and timing shapes and name their official resolution source. Economic events link to the Narwhal endpoint publishing the actual value. Odds history supports intervals from 1 minute to daily.
Kalshi API suits applications trading directly on Kalshi or needing markets beyond Narwhal's supported topics, including climate, technology and entertainment. Public REST market data needs no key. Official Python and TypeScript SDKs ship weekly, though they may lag the API. Separate historical endpoints and candlesticks support historical queries. WebSocket access requires signed authentication, even for public channels. Order books return yes and no bids, with prices encoded as strings.
Yes. Narwhal Free includes 5,000 successful requests per month, commercial app use and both REST and hosted MCP access. Free returns the previous day's close for prediction odds; Basic and Pro add live odds and WebSocket streaming.
Yes. Kalshi requires signed authentication for WebSocket connections, including public channels. Its public REST market data needs no API key. Narwhal provides both venues through one schema and key; Basic and Pro include live odds and a WebSocket stream, while Free returns the previous day's close.
Replace the request URL and authentication, then map the JSON response into your application's fields. The examples use standard fetch in JavaScript and requests in Python, so integration fits an ordinary HTTP client. Keep your key on the server and carry the response's units, dates and missing values into your display or calculations.
The shared cap applies to successful REST and MCP requests together. There are no automatic overage charges. Basic includes 100,000 monthly requests; quotas reset each month even when you pay yearly.
The comparison uses Narwhal's current public contract and the following first-party competitor pages.
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