Kristo Intelligence — DeFi Signals API on Base

Paid DeFi market intelligence for AI agents. x402-native: agents pay per call in USDC, from $0.003 — no signup, no API keys, no subscriptions.

Live API: https://kristo-intelligence-api.onrender.com Marketplace listing (settlement-verified): https://payapi.market/api/kristo-intelligence-defi-signals-api

What it is

Kristo Intelligence is a live trading-agent API on the Base network (Coinbase's L2). Every call returns machine-readable market intelligence:

• Trading-agent signals — for ETH, ONDO, KAITO and DEGEN: action, 0–1 confidence score, current USD price, and one-line reasoning
• Whale flow — large USDC transfer tracking on Base (transfers ≥ $5M, labeled counterparties)
• Arbitrage radar — cross-DEX spreads, refreshed every 60 seconds
• Rug-risk checks — pre-trade safety screening
• Market stats — aggregated activity (CoinGecko, DEXScreener, Fear & Greed)

Payment (x402)

The API speaks the x402 payment standard. The flow is three steps and works from any HTTP client:

1. GET any paid endpoint → HTTP 402 with a self-describing challenge (exact USDC amount, receiver address, chain)
2. Send that USDC amount on Base to the listed receiver
3. Retry the call with the payment header → 200 with your data

No keys. No accounts. Prices from $0.003 per call (the cheapest route is GET /api/v1/signal). Settled in USDC on Base (chain 8453).

MCP (Model Context Protocol)

The API is exposed as an MCP server for Claude Desktop, Cursor, Continue, LangChain and any MCP-compatible client:

• SSE transport: https://kristo-intelligence-api.onrender.com/mcp/sse
• Streamable HTTP transport: POST https://kristo-intelligence-api.onrender.com/mcp (JSON-RPC 2.0 — initialize, tools/list, tools/call, ping)

MCP tools:

Each tool advertises its x402 price inline, so an agent can decide and pay without reading docs.

Discover via PayAPI

The listing lives on PayAPI Market and can be discovered through PayAPI's own MCP server — agents already connected to the marketplace warehouse will find our routes from both sides:

{
  "mcpServers": {
    "payapi": {
      "url": "https://payapi.market/mcp"
    }
  }
}

Listing: https://payapi.market/api/kristo-intelligence-defi-signals-api

Try it — one command

The public reference client walks the full payment path (discovery → 402 challenge → paid retry) with no wallet required in demo mode:

python examples/demo_agent/demo_agent.py --endpoint /api/v1/signal

Free discovery surfaces (no payment needed):

• x402 discovery: /.well-known/x402
• OpenAPI 3.0: /openapi.json
• MCP manifest: /api/mcp/manifest
• Quickstart snippets (curl/Python/Node): /api/v1/quickstart
• Health: /health

Repository layout

main.py                  # Flask app: API, x402 paywall, agents, transports
app/blueprints/discovery.py  # Discovery surfaces (.well-known, MCP, llms.txt)
services/                # CoinGecko client, DeFi signals, trading agent
blockchain/wallet.py     # Base wallet, USDC transfers, on-chain verification
scripts/                 # On-chain recon tools, demo agent, E2E helpers
examples/demo_agent/     # Public reference x402 client
docs/                    # Audit reports, recon findings, outreach docs
tests/                   # Test suite (423 tests)

Verification

• Settlement-verified on PayAPI Market: 4 independent paid canaries settled on-chain, zero payment incidents
• x402 registered: 11 resources on x402scan, canonical v2 challenges (CAIP-2 eip155:8453, atomic units, bazaar schema)
• 23/23 adversarial audit (mystery-agent simulation, see docs/)
• 423 automated tests in this repository

Docs

• docs/MARKET_WRITEUP.md — on-chain audit of the machine-payments market
• docs/PAYER_ORIGIN.md — who actually pays on this market
• docs/MYSTERY_AGENT_REPORT.md — adversarial buyer simulation
• docs/RECON_FINDINGS.md — ongoing on-chain recon notes

License

MIT — the full standard text is in LICENSE.

The payment receiver and endpoint structure are stable invariants — discovery surfaces and integrations depend on them.

Commercial use notice

This software executes real financial transactions on the Base blockchain network when AGENT_AUTO_EXECUTE=true. The authors and copyright holders assume no responsibility for financial losses resulting from the use of this software. Always test on Base Sepolia testnet before mainnet deployment.