Predictive Alpha On-Chain Market Intelligence x402 Monetized API (Base) Autonomous Trading Data

Alpha Sentinel Documentation & Use-Case Playbooks Hub

Alpha Sentinel is an autonomous-agent-ready On-Chain Market Intelligence server exposing statistical volatility detection, social sentiment aggregation, multi-factor portfolio risk scoring, and executive market synthesis over Model Context Protocol (MCP), Agent-to-Agent (A2A) JSON-RPC, and x402 pay-per-call HTTP settled natively in USDC on Base (eip155:8453).

Zero API keys, zero OAuth handshakes, and zero monthly lock-in required for autonomous agents: discover endpoints via /.well-known/x402 or /.well-known/mcp.json, inspect rate-limited previews at /tools/{tool}/sample, and settle per-request micropayments via PAYMENT-SIGNATURE or AgentCash.

Explore Interactive Swagger UI (/openapi) Inspect /.well-known/x402 Catalog Read /llms.txt Agent Manifest

Long-Tail Technical Playbooks

Each engineering playbook below provides production-ready architecture diagrams, mathematical specifications, MCP JSON-RPC payloads, and Python / TypeScript x402 payment loop implementations tailored for autonomous DeFi and quantitative execution agents.

Playbook 01 • Risk & Monitoring

How to automate volatility alerts using Alpha Sentinel

Configure high-frequency or cron-scheduled statistical Z-score polling with analyze_volatility (configurable window_minutes and z_threshold), classify NORMAL, MODERATE, HIGH, and CRITICAL standard deviation spikes, settle $0.02 USDC x402 challenges on Base, and trigger automated circuit breakers or Discord/Slack/Telegram webhooks.

Tool: analyze_volatility ($0.02) Read Playbook →

Playbook 02 • Agent Architecture

Integrating predictive alpha into an autonomous trading agent

End-to-end blueprint for LangGraph, Claude MCP, Coinbase AgentKit / AgentCash, and A2A agents. Discover capabilities dynamically, orchestrate fetch_price, analyze_volatility, calculate_risk_score, and generate_market_report, compute Kelly-adjusted position sizing from 4-factor risk weights, and manage on-chain USDC treasury budgets.

Tools: Full 5-Tool Pipeline Read Playbook →

Playbook 03 • Trade Execution

Reducing slippage with real-time sentiment analysis

Prevent toxic order flow and liquidity thinning losses before routing large swaps. Combine aggregate_sentiment (Twitter/X, Reddit, Telegram, News, Fear & Greed macro proxy) with analyze_volatility and calculate_risk_score to dynamically switch between immediate execution, TWAP/VWAP order splitting, or execution delay.

Tool: aggregate_sentiment ($0.01) Read Playbook →

System Architecture & Protocol Surface

Alpha Sentinel unifies three standardized machine-to-machine commerce and tool-calling protocols over a single deterministic intelligence engine:

┌──────────────────────────────────────────────────────────────────────────────────┐
│                     AUTONOMOUS TRADING AGENTS & LLM CLIENTS                      │
│   Claude / Cursor MCP  │  LangGraph / OpenAI  │  Coinbase AgentKit / AgentCash   │
└────────────┬───────────────────────┬──────────────────────────┬──────────────────┘
             │                       │                          │
   Streamable HTTP JSON-RPC    A2A v1.0 JSON-RPC        HTTP REST + x402 Header
   POST /mcp                   POST /a2a                POST /tools/{tool_name}
   _meta["x402/payment"]       x402.payment.payload     PAYMENT-SIGNATURE / X-PAYMENT
             │                       │                          │
             ▼                       ▼                          ▼
┌──────────────────────────────────────────────────────────────────────────────────┐
│                    ALPHA SENTINEL x402 COMMERCE & GATEWAY LAYER                  │
│  • Challenge Generator (HTTP 402 + PAYMENT-REQUIRED header + accepts[] array)    │
│  • Coinbase CDP Facilitator Verify & Settle (Base Mainnet eip155:8453 USDC)      │
│  • Upstash Redis Idempotency & Replay Guard (SET NX, 24h TTL)                    │
└────────────────────────────────────┬─────────────────────────────────────────────┘
                                     │
                                     ▼
┌──────────────────────────────────────────────────────────────────────────────────┐
│                   PREDICTIVE ALPHA & MARKET INTELLIGENCE ENGINE                  │
│  1. fetch_price ($0.005 / Free MCP)     4. calculate_risk_score ($0.03 USDC)     │
│  2. analyze_volatility ($0.02 USDC)     5. generate_market_report ($0.15 USDC)   │
│  3. aggregate_sentiment ($0.01 USDC)    + Rate-Limited /tools/{name}/sample      │
└──────────────────────────────────────────────────────────────────────────────────┘

Intelligence Tool Catalog & x402 Pricing Matrix

Tool Name	Canonical HTTP Endpoint	Price (USDC on Base)	Atomic Units (6 dec)	Primary Output & Signal
`fetch_price`	`POST /tools/fetch_price`	$0.005 (Free via MCP)	`5000`	Spot price (USD), 24h delta %, 24h volume USD, UTC timestamp.
`analyze_volatility`	`POST /tools/analyze_volatility`	$0.02	`20000`	Rolling Z-score array, anomaly indices, mean/std_dev, `NORMAL`/`MODERATE`/`HIGH`/`CRITICAL` alert level.
`aggregate_sentiment`	`POST /tools/aggregate_sentiment`	$0.01	`10000`	Weighted sentiment score (`-1.0` to `+1.0`), category (`bullish`/`neutral`/`bearish`), Fear & Greed index.
`calculate_risk_score`	`POST /tools/calculate_risk_score`	$0.03	`30000`	Composite risk score (`0.0`–`1.0`) across Volatility (40%), Liquidity (25%), Market Cap (20%), BTC Correlation (15%).
`generate_market_report`	`POST /tools/generate_market_report`	$0.15	`150000`	Daily/weekly/monthly executive synthesis combining price, volatility, sentiment, and multi-factor risk recommendations.

Quick Reference: Discovery & Protocol Endpoints

Protocol Surface	Endpoint Path	Method	Purpose
MCP Discovery	`/.well-known/mcp.json`	`GET`	Machine-readable Streamable HTTP MCP registration manifest and tool schemas.
MCP JSON-RPC	`/mcp`	`POST`	Streamable HTTP JSON-RPC 2.0 endpoint supporting `initialize`, `tools/list`, and `tools/call`.
A2A Agent Card	`/.well-known/agent-card.json`	`GET`	A2A Protocol v1.0 Agent Card advertising skills, input/output modes, and `a2a-x402` extensions.
A2A JSON-RPC	`/a2a`	`POST`	A2A JSON-RPC task endpoint supporting `message/send` and `tasks/get` with x402 settlement.
x402 Discovery	`/.well-known/x402`	`GET`	Canonical x402 v2 & AgentCash discovery manifest listing all priced endpoints, Base network, and headers.
Interactive OpenAPI	`/openapi` & `/openapi.json`	`GET`	Swagger UI interactive API explorer and OpenAPI 3.1.0 specification with `x-payment-info` annotations.
Free Tool Previews	`/tools/{tool_name}/sample`	`GET / POST`	Rate-limited live sample output for any intelligence tool prior to committing USDC micropayments.

1. Connect via MCP JSON-RPC (`POST /mcp`)

curl -sX POST https://alpha-sentinel-mcp.vercel.app/mcp \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": "init-1",
    "method": "tools/list",
    "params": {}
  }' | jq .

2. Discover & Call via AgentCash CLI (x402 on Base)

# 1. Discover all paid tools and USDC pricing on Base (eip155:8453)
npx agentcash@latest discover https://alpha-sentinel-mcp.vercel.app

# 2. Execute a paid call with automatic 402 challenge signing & settlement
npx agentcash@latest fetch https://alpha-sentinel-mcp.vercel.app/tools/analyze_volatility \
  --method POST \
  --body '{"symbol":"btc","window_minutes":60,"z_threshold":2.0}'

3. Call via A2A Protocol (`POST /a2a`)

curl -sX POST https://alpha-sentinel-mcp.vercel.app/a2a \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": "a2a-1",
    "method": "message/send",
    "params": {
      "skill": "fetch_price",
      "symbol": "eth"
    }
  }' | jq .