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2s Predict API

The predict API from 2s — 23 operation(s) for predict.

2s Predict API is one of 114 APIs that 2s publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Predict. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 23 operations across 23 paths, and defines 3 schemas. It is described by OpenAPI 3.2.0, at version 1.

Requests are made against a single base URL, https://2s.io.

23 operations 23 paths 3 schemas 23 GET

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1
Base URL
https://2s.io/mcp
Authentication
API Key
Contact
Resource Areas
1

Authentication & Security 1

2s Predict API declares 1 security scheme for authenticating requests. An API key is passed in the header as PAYMENT-SIGNATURE (x402Payment).

  • x402Payment — x402 protocol v2: base64-encoded PaymentPayload. Call any paid endpoint without auth to receive a 402 with a multi-network PaymentRequirements envelope. Sign f…

Paths & Operations 23

Across 23 paths, the API surfaces 23 operations — 23 GET. Each is listed below with its method, path, parameters, and response codes.

Predict 23
GET
/api/predict/activity
A wallet's Polymarket on-chain activity feed: trades
predict_activity 4 params → 200400402405500502
GET
/api/predict/crypto-updown
Polymarket crypto up-or-down markets - the recurring 'Will
predict_crypto-updown 2 params → 200400402405500502
GET
/api/predict/events
Browse Polymarket events (an event groups related markets
predict_events 6 params → 200400402405500502
GET
/api/predict/holders
Top holders of a Polymarket market, grouped by outcome
predict_holders 3 params → 200400402405500502
GET
/api/predict/kalshi-events
Browse Kalshi events (an event groups related markets, e.g
predict_kalshi-events 5 params → 200400402405500502
GET
/api/predict/kalshi-market
A single Kalshi market by ticker
predict_kalshi-market 2 params → 200400402405500502
GET
/api/predict/kalshi-markets
Browse Kalshi regulated prediction markets
predict_kalshi-markets 7 params → 200400402405500502
GET
/api/predict/kalshi-orderbook
Order book for a Kalshi market by ticker: resting yes and
predict_kalshi-orderbook 3 params → 200400402405500502
GET
/api/predict/kalshi-trades
Recent trades on Kalshi, optionally filtered to one market
predict_kalshi-trades 4 params → 200400402405500502
GET
/api/predict/leaderboard
Polymarket smart-wallet leaderboard: top traders ranked by
predict_leaderboard 4 params → 200400402405500502
GET
/api/predict/limitless-markets
Active prediction markets on Limitless Exchange (on-chain
predict_limitless-markets 2 params → 200400402405500502
GET
/api/predict/market
A single Polymarket market by conditionId, slug, or id
predict_market 4 params → 200400402405500502
GET
/api/predict/markets
Browse Polymarket prediction markets
predict_markets 8 params → 200400402405500502
GET
/api/predict/matched-pairs
Cross-venue equivalent-market pairs for arbitrage /
predict_matched-pairs 3 params → 200400402405500502
GET
/api/predict/orderbook
Full CLOB order book (bids + asks with price and size) for
predict_orderbook 2 params → 200400402405500502
GET
/api/predict/positions
A wallet's open Polymarket positions
predict_positions 3 params → 200400402405500502
GET
/api/predict/price
Live best bid, best ask, and midpoint for a Polymarket
predict_price 2 params → 200400402405500502
GET
/api/predict/price-history
Time-series price (implied-probability) history for a
predict_price-history 4 params → 200400402405500502
GET
/api/predict/search
Cross-venue prediction-market keyword search across
predict_search 4 params → 200400402405500502
GET
/api/predict/sports
Sports prediction markets across Polymarket and Kalshi in
predict_sports 3 params → 200400402405500502
GET
/api/predict/trades
Recent Polymarket trades
predict_trades 4 params → 200400402405500502
GET
/api/predict/wallet
A Polymarket trader's portfolio by wallet address: total
predict_wallet 2 params → 200400402405500502
GET
/api/predict/whales
Polymarket whale radar: the largest recent trades by USD
predict_whales 3 params → 200400402405500502

Schemas 3

The contract defines 3 schemas that model the data the API accepts and returns. The most detailed are X402PaymentRequiredV2 (5 properties), Source (3 properties). Each schema is shown below with its type and property counts.

X402PaymentRequiredV2
object
x402 v2 PaymentRequired envelope. Pick any entry from accepts[], sign for that rail, retry with the PAYMENT-SIGNATURE header.
5 properties 2 required
Source
object
Provenance of the data: upstream provider, source URL, and license.
3 properties
CallMeta
object
Per-call meta envelope — endpoint id, cost, caller kind, settlement details.

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

2s-io-predict-api-openapi.yml Raw ↑

Other APIs 2s publishes across the network.

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2s AI API
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2s Bank API
2s Barcode API
2s Batch API
2s Bio API
2s Bls API
Where this information came from

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