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@predexon/sdk

v0.1.2

Published

Unified, type-safe TypeScript SDK for the Predexon prediction-market APIs — market data and trading in one client.

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Links

Git

Maintainers

predexon-teampredexon-team

Keywords

predexonprediction-marketspolymarketkalshitradingsdktypescript

Readme

@predexon/sdk

Unified, type-safe TypeScript SDK for the Predexon prediction-market APIs — market data and trading in one client.

License: MIT

Summary

Predexon API: Unified, type-safe TypeScript SDK for the Predexon prediction-market APIs — market data and trading in one client.

Coverage

  • Data API (api.predexon.com): markets, prices, candlesticks, orderbook history, trades, wallet analytics, smart-money & leaderboards across Polymarket, Kalshi, Limitless, Opinion, Predict.Fun, Dflow, and Binance, plus cross-venue search.
  • Trading API (trade.predexon.com): managed accounts, order placement & management, balances, positions, fund transfers/bridging, and cross-venue order routing.

Two API keys The data and trading planes are authenticated separately. Provide both via the SDK config or environment variables — the SDK automatically routes each call to the correct host:

const predexon = new Predexon({
  security: {
    dataApiKey: process.env.PREDEXON_DATA_API_KEY,        // → api.predexon.com
    tradingApiKey: process.env.PREDEXON_TRADING_API_KEY,  // → trade.predexon.com
  },
});

Errors are unified across both planes — every error exposes .error, .message, and .statusCode.

Funding note: inbound deposits from non-Base chains return a transaction for the end user to sign; Hyperliquid uses a separate funding path. See the funding guide.

Full docs: https://docs.predexon.com

Table of Contents

SDK Installation

The SDK can be installed with either npm, pnpm, bun or yarn package managers.

NPM

npm add @predexon/sdk

PNPM

pnpm add @predexon/sdk

Bun

bun add @predexon/sdk

Yarn

yarn add @predexon/sdk

[!NOTE] This package is published as an ES Module (ESM) only. For applications using CommonJS, use await import() to import and use this package.

Requirements

For supported JavaScript runtimes, please consult RUNTIMES.md.

SDK Example Usage

Example

import { Predexon } from "@predexon/sdk";

const predexon = new Predexon({
  security: {
    dataApiKey: process.env["PREDEXON_DATA_API_KEY"] ?? "",
  },
});

async function run() {
  const result = await predexon.search.markets({
    q: "trump",
    venue: "polymarket,kalshi",
  });

  console.log(result);
}

run();

Authentication

Per-Client Security Schemes

This SDK supports the following security schemes globally:

| Name | Type | Scheme | Environment Variable | | --------------- | ------ | ------- | -------------------------- | | dataApiKey | apiKey | API key | PREDEXON_DATA_API_KEY | | tradingApiKey | apiKey | API key | PREDEXON_TRADING_API_KEY |

You can set the security parameters through the security optional parameter when initializing the SDK client instance. The selected scheme will be used by default to authenticate with the API for all operations that support it. For example:

import { Predexon } from "@predexon/sdk";

const predexon = new Predexon({
  security: {
    dataApiKey: process.env["PREDEXON_DATA_API_KEY"] ?? "",
  },
});

async function run() {
  const result = await predexon.search.markets({
    q: "trump",
    venue: "polymarket,kalshi",
  });

  console.log(result);
}

run();

Import paths

Everything you need is reachable from one of these four subpaths.

| Subpath | Holds | |---------|-------| | @predexon/sdk | The Predexon client, HTTPClient, transport types | | @predexon/sdk/models/errors | All error classes (PredexonError, ApiError, DataErrorResponse, etc.), the TradingErrorCode enum, and the Detail type | | @predexon/sdk/models | Every schema type — markets, accounts, balances, sort/filter enums, response shapes | | @predexon/sdk/models/operations | Per-operation Request types (and Response types when an operation returns more than just the body) |

import { Predexon } from "@predexon/sdk";
import { ApiError, TradingErrorCode } from "@predexon/sdk/models/errors";
import { Account, PolymarketMarket, KalshiMarketsSortOption } from "@predexon/sdk/models";
import type { PlaceOrderAccountRequest } from "@predexon/sdk/models/operations";

Available Resources and Operations

Accounts

Binance

Dflow

Kalshi

Limitless

Opinion

Orders

Polymarket

Predictfun

Router

Search

  • markets - Search Markets Across Venues

Transfers

Standalone functions

All the methods listed above are available as standalone functions. These functions are ideal for use in applications running in the browser, serverless runtimes or other environments where application bundle size is a primary concern. When using a bundler to build your application, all unused functionality will be either excluded from the final bundle or tree-shaken away.

To read more about standalone functions, check FUNCTIONS.md.

Retries

Some of the endpoints in this SDK support retries. If you use the SDK without any configuration, it will fall back to the default retry strategy provided by the API. However, the default retry strategy can be overridden on a per-operation basis, or across the entire SDK.

To change the default retry strategy for a single API call, simply provide a retryConfig object to the call:

import { Predexon } from "@predexon/sdk";

const predexon = new Predexon({
  security: {
    dataApiKey: process.env["PREDEXON_DATA_API_KEY"] ?? "",
  },
});

async function run() {
  const result = await predexon.search.markets({
    q: "trump",
    venue: "polymarket,kalshi",
  }, {
    retries: {
      strategy: "backoff",
      backoff: {
        initialInterval: 1,
        maxInterval: 50,
        exponent: 1.1,
        maxElapsedTime: 100,
      },
      retryConnectionErrors: false,
    },
  });

  console.log(result);
}

run();

If you'd like to override the default retry strategy for all operations that support retries, you can provide a retryConfig at SDK initialization:

import { Predexon } from "@predexon/sdk";

const predexon = new Predexon({
  retryConfig: {
    strategy: "backoff",
    backoff: {
      initialInterval: 1,
      maxInterval: 50,
      exponent: 1.1,
      maxElapsedTime: 100,
    },
    retryConnectionErrors: false,
  },
  security: {
    dataApiKey: process.env["PREDEXON_DATA_API_KEY"] ?? "",
  },
});

async function run() {
  const result = await predexon.search.markets({
    q: "trump",
    venue: "polymarket,kalshi",
  });

  console.log(result);
}

run();

Error Handling

PredexonError is the base class for all HTTP error responses. It has the following properties:

| Property | Type | Description | | ------------------- | ---------- | --------------------------------------------------------------------------------------- | | error.message | string | Error message | | error.statusCode | number | HTTP response status code eg 404 | | error.headers | Headers | HTTP response headers | | error.body | string | HTTP body. Can be empty string if no body is returned. | | error.rawResponse | Response | Raw HTTP response | | error.data$ | | Optional. Some errors may contain structured data. See Error Classes. |

Example

import { Predexon } from "@predexon/sdk";
import * as errors from "@predexon/sdk/models/errors";

const predexon = new Predexon({
  security: {
    dataApiKey: process.env["PREDEXON_DATA_API_KEY"] ?? "",
  },
});

async function run() {
  try {
    const result = await predexon.search.markets({
      q: "trump",
      venue: "polymarket,kalshi",
    });

    console.log(result);
  } catch (error) {
    // The base class for HTTP error responses
    if (error instanceof errors.PredexonError) {
      console.log(error.message);
      console.log(error.statusCode);
      console.log(error.body);
      console.log(error.headers);

      // Depending on the method different errors may be thrown
      if (error instanceof errors.DataErrorResponse) {
        console.log(error.data$.detail); // models.Detail
      }
    }
  }
}

run();

Error Classes

Primary error:

Network errors:

Inherit from PredexonError:

  • HTTPValidationError: Status code 422. Applicable to 53 of 77 methods.*
  • DataErrorResponse: Applicable to 44 of 77 methods.*
  • ApiError: Unified error envelope returned by every endpoint on any 4xx or 5xx response. The error field is a stable snake_case code partners can branch on; message is the human-readable explanation (free-form, may change); requestId is the request correlation id (also returned in the x-request-id response header) — quote it when contacting support. Applicable to 24 of 77 methods.*
  • ResponseValidationError: Type mismatch between the data returned from the server and the structure expected by the SDK. See error.rawValue for the raw value and error.pretty() for a nicely formatted multi-line string.

* Check the method documentation to see if the error is applicable.

Custom HTTP Client

The TypeScript SDK makes API calls using an HTTPClient that wraps the native Fetch API. This client is a thin wrapper around fetch and provides the ability to attach hooks around the request lifecycle that can be used to modify the request or handle errors and response.

The HTTPClient constructor takes an optional fetcher argument that can be used to integrate a third-party HTTP client or when writing tests to mock out the HTTP client and feed in fixtures.

The following example shows how to:

  • route requests through a proxy server using undici's ProxyAgent
  • use the "beforeRequest" hook to add a custom header and a timeout to requests
  • use the "requestError" hook to log errors
import { Predexon } from "@predexon/sdk";
import { ProxyAgent } from "undici";
import { HTTPClient } from "@predexon/sdk/lib/http";

const dispatcher = new ProxyAgent("http://proxy.example.com:8080");

const httpClient = new HTTPClient({
  // 'fetcher' takes a function that has the same signature as native 'fetch'.
  fetcher: (input, init) =>
    // 'dispatcher' is specific to undici and not part of the standard Fetch API.
    fetch(input, { ...init, dispatcher } as RequestInit),
});

httpClient.addHook("beforeRequest", (request) => {
  const nextRequest = new Request(request, {
    signal: request.signal || AbortSignal.timeout(5000)
  });

  nextRequest.headers.set("x-custom-header", "custom value");

  return nextRequest;
});

httpClient.addHook("requestError", (error, request) => {
  console.group("Request Error");
  console.log("Reason:", `${error}`);
  console.log("Endpoint:", `${request.method} ${request.url}`);
  console.groupEnd();
});

const sdk = new Predexon({ httpClient: httpClient });

Debugging

You can setup your SDK to emit debug logs for SDK requests and responses.

You can pass a logger that matches console's interface as an SDK option.

[!WARNING] Sensitive headers (e.g. x-api-key, authorization) are redacted in debug logs. Request and response bodies are logged in full, so enable debug logging only during local development, not in production.

import { Predexon } from "@predexon/sdk";

const sdk = new Predexon({ debugLogger: console });

You can also enable a default debug logger by setting an environment variable PREDEXON_DEBUG to true.

Development

Maturity

This SDK is in beta, and there may be breaking changes between versions without a major version update. Therefore, we recommend pinning usage to a specific package version. This way, you can install the same version each time without breaking changes unless you are intentionally looking for the latest version.

Contributions

While we value open-source contributions to this SDK, this library is generated programmatically. Any manual changes added to internal files will be overwritten on the next generation. We look forward to hearing your feedback. Feel free to open a PR or an issue with a proof of concept and we'll do our best to include it in a future release.