Build on Trading & Intelligence APIs
Signals, market data, and pay-per-query intelligence — one REST API with replay-safe webhooks, and forward-deployed engineers to help you ship.
// Run a Deep Intelligence query — paid via x402
const report = await fexr.markets.query({
tier: 'deep_intelligence', // $2.00 USDC
topic: 'l2-token-unlocks',
format: 'json'
});
// Subscribe to signal events
fexr.webhooks.on('signal.published', handleSignal);Consumer + On-Chain, Unified
Build apps that connect real-world commerce to blockchain contracts. Fexr streamlines the integration so you can focus on your product.
Trading Signals Feed
Pull AI signals with plain-English risk summaries over REST, or receive them as webhook events the moment they publish. Filter by market and signal type.
Market Intelligence Queries
Call pay-per-query reports programmatically — your code pays in USDC over x402 per request, from $0.50 a query. No API contract, no key provisioning wait.
Account & Order Events
Replay-safe webhooks push order previews, executions, and portfolio changes to your stack in real time — every event signed and audit-logged.
Portfolio Data
Read positions, PnL, and margin health for connected accounts — the same data behind the app's portfolio view, available to your own tools.
Compliance Built In
Fexr is non-custodial by design: user funds stay in user wallets under capped, revocable permissions, and every API action is audit-logged. Read Fexr's infrastructure classification under FATF Recommendation 15 →
Sandbox First
A sandbox environment mirrors production behavior, so you can test signals, webhooks, and query flows without live transactions.
Agent automation
Wire AI agents that read signals, run market-intelligence queries, and pay per query over x402 — all within caps and permissions the user defines.
We Build With You
Complex integrations don't have to slow you down. Our forward deployed engineers work directly with your team to ship endpoints fast.
Custom Connectors
We build integrations for your stack
Integration Design
Map signals and webhooks to your stack
Compliance Review
Navigate regulatory requirements
Launch Support
On-call through go-live and beyond
# Your custom integration
connectors:
shopify:
store_url: "your-store.myshopify.com"
webhook_events: [order_paid, refund]
signature: "replay_safe"
signals:
events: [signal_published, order_executed]
delivery: webhook
# FDE builds + deploys for youConnect Everything
One integration layer for signals, market data, and account events — unified auth, observability, and audit logging.
Commerce
Shopify, Stripe, WooCommerce
Sync trading activity into your CRM, dashboards, or accounting tools.
Social
Discord, Telegram, Slack
Relay trading signals to Telegram, email, or push — automatically.
Finance
Binance, Coinbase, Banks
Monitor holdings, verify trades, and reconcile from the audit log.
IoT & Sensors
Facility, Wearables, GPS
Ingest telemetry, verify conditions, trigger contract logic.
Which Programming Languages Does the Fexr SDK Support?
Typed clients for signals, market data, webhooks, and x402 queries. Ship in days, not months.
JavaScript / TypeScript
Node.js and browser support. Signals, market data, webhooks, x402 queries—all typed. npm install @fexr/sdk
Python
Async support with aiohttp. Pydantic models. Perfect for data pipelines and backend integrations. pip install fexr-sdk
Swift
Native iOS/macOS. Swift concurrency, Combine support. Build mobile trading experiences. SPM: fexr-swift
Kotlin
Android-first with coroutine support. Jetpack Compose ready. implementation 'io.fexr:sdk'
What Documentation and Sandbox Environments Does Fexr Provide?
Frequently Asked Developer Questions About the Fexr API
Common questions from teams building on Fexr.
01.What does the FDE engagement look like?
Our forward deployed engineers join your Slack, review your architecture, build custom connectors, and stay on-call through launch. Think of them as an extension of your team.
02.Can I deploy my own contracts?
Yes. Bring your own stack and connect it to Fexr over REST and webhooks — you own the application and control the business logic; Fexr provides the signals, data, and execution rails.
03.How do you handle compliance?
Fexr is non-custodial: user funds stay in user wallets under capped, revocable permissions. Our team reviews your use case and helps ensure your integration design meets the requirements of your jurisdiction.
04.Which chains are supported?
Trading executes on Hyperliquid, funded with USDC via Arbitrum. Market-intelligence queries settle in USDC over x402 on Base.
Let's Build Together
Talk to our engineering team about your use case. We'll scope the integration and get you to production fast.
Explore Further
- API Documentation — unlock secure endpoints in under an hour
- API & Webhook Integrations — connect Fexr to your entire stack
- How Decentralized Oracles Work — the trust layer for market data
- Choose Your Blockchain Protocol — Polygon, Solana, or Rubix
- Enterprise Plan — intelligence without per-query fees