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
Create a basic or enterprise account at app.fexr.io and your API key is issued immediately — no approval email, no waiting. Full catalog documentation lives at api.fexr.io. Basic accounts access x402 endpoints and the docs. DPoP auth-locked enterprise endpoints require a Fexr Seat.
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.
Two Access Tiers
Basic: x402 per-call endpoints + full docs. Fexr Seat ($2,500/yr): adds DPoP auth-locked enterprise-grade endpoints.
3 Steps
From sign-up to first call
01
Sign Up
Create a basic or enterprise account at app.fexr.io. Your API key appears in your dashboard immediately — 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 on Base — any account, no metering setup. DPoP auth-locked endpoints (enterprise-grade institutional data): active for Fexr Seat holders. Basic accounts can call x402 endpoints and browse documentation, but DPoP-locked endpoints return 403.
Developer Toolkit
Included with every access
DPoP Signer — required
Enterprise-grade 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. Basic and enterprise accounts get an API key at sign-up. x402 endpoints are callable immediately — pay per call in USDC on Base. DPoP-locked enterprise endpoints activate with a Fexr Seat ($2,500/yr).
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