Get Your Key
Sign up at app.fexr.io. Key issued to your dashboard immediately — no approval, no email.
Self-Serve API Access
API Documentation
Subscribe to Plus or Desk at app.fexr.io and create your API key straight away — no approval email, no waiting. Full catalog documentation lives at api.fexr.io. Free accounts read the docs and pay per call over x402 with no key. Plus keys get 1,000 requests a day; Desk keys get 50,000.
npm install fexrJS/TS SDK on npm
Building for agents?
The Fexr MCP server exposes the full market intelligence catalog as agent tools — price data, signals, token unlocks, smart-money flow, and AI research, callable from any LLM framework.
See Fexr LLM Skills →
Quick Snapshot
Everything you need in three cards
Docs at api.fexr.io
Full interactive documentation. Authenticate with your API key to unlock live examples for every catalog endpoint.
Three Access Levels
Free: pay-per-call x402, no subscription key. Plus ($15/month): 1,000 requests a day. Desk ($2,500/year): 50,000 a day plus organization-only endpoints.
3 Steps
From sign-up to first call
01
Sign Up
Subscribe to Plus or Desk at app.fexr.io and create your API key in the dashboard — no approval required.
02
Open the Docs
Go to api.fexr.io and authenticate with your API key. Every catalog endpoint is documented with live examples, request schemas, and response shapes.
03
Pick Your Access Model
x402 endpoints: pay per call in USDC or USDT on Base — no subscription. Plus keys count against 1,000 requests a day and Desk keys against 50,000; past the quota requests return 429. Desk organization-only endpoints (unified intelligence search, vault signal intelligence, governance) return 402 on other plans.
Developer Toolkit
Included with every access
DPoP Signer — required
These endpoints enforce DPoP (Demonstrating Proof of Possession) — a bearer API key alone won't pass. Our JS, Python, and Go helpers handle key generation and proof minting. Basic endpoints use your API key as a standard bearer token.
Webhook Replay
Replay catalog endpoint responses in your sandbox — test signal parsing, price normalization, and downstream logic without live calls.
Schema Browser
Copy-ready samples and type definitions for every API object.
Terraform & Postman
Boot infrastructure and share collections with your team.
Observability Kit
Grafana and Prometheus dashboards mirroring Fexr's monitoring.
Fast Support
Questions on DPoP setup, endpoint behavior, or the Seat? Email [email protected] — human reply, not a bot.
Ready When You Are
Sign up, get your key, start calling.
No email required. Plus and Desk accounts create API keys from the dashboard; x402 endpoints are callable any time, paid per call in USDC or USDT on Base. Desk adds 50,000 requests a day and organization-only endpoints.
curl api.fexr.io/v1/signals/BTC \
-H "Authorization: Bearer $API_KEY"
# 200 OK — MOMENTUM_SIGNAL: BULLISH
# FUNDING_RATE: 0.012% DATA_QUALITY: 97.9