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George Kioko
George Kioko

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I Built a $0.01/call Alternative to DefiLlama's $300/month API

#defi #blockchain #webdev #api

Last month I needed real-time DeFi chain data for a trading agent I was building. TVL, fees, active addresses, capital flows -- the basics you need to make informed on-chain decisions.

DefiLlama has all of it. But the good stuff -- bridged TVL, active addresses, net inflows -- is locked behind their $300/month Pro tier. For a solo developer testing an idea, that price kills experimentation before it starts.

So I built my own.

The Problem

DefiLlama's free API covers the basics: TVL, fees, revenue, DEX volume. But the metrics that actually matter for trading signals -- active addresses trending up, capital flowing between chains, bridged TVL shifting -- those require Pro.

I needed 16 metrics across 6 chains (Ethereum, Solana, BSC, Bitcoin, Tron, Arbitrum). Paying $300/month to test a hypothesis felt wrong.

How I Solved It

The approach combines three data sources:

  1. DefiLlama's free API for the 12 publicly available metrics (TVL, fees, revenue, DEX volume, token data, stablecoins, perps volume)
  2. Browser scraping with Cloudflare bypass for the 4 paywalled metrics (bridged TVL, net inflows, active addresses, perps volume from the chains page)
  3. Apify Standby as the hosting layer, keeping the API always-on with sub-200ms responses

The scraper runs a headless browser through DefiLlama's chains page, waits for the JavaScript-rendered tables to load, and extracts the data that the frontend displays but the API locks away. It's the same data -- just accessed differently.

graph LR
    A[Client Request] --> B[Apify Standby API]
    B --> C{Cache Fresh?}
    C -->|Yes| D[Return Cached Data]
    C -->|No| E[Fetch Pipeline]
    E --> F[DefiLlama Free API]
    E --> G[Browser Scraper]
    G --> H[Cloudflare Bypass]
    H --> I[Parse Chain Tables]
    F --> J[Merge & Cache]
    I --> J
    J --> D
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Architecture

The API runs as an Apify Standby actor -- meaning it stays warm and responds to HTTP requests instantly instead of cold-starting each time. The data pipeline works like this:

  • Every 5 minutes, the actor fetches fresh data from both the free API and the browser scraper
  • Results are merged into a unified format with raw values, formatted strings, and units
  • Cached in memory so API responses are just object lookups, typically under 50ms
  • Staleness tracking flags data older than 10 minutes so clients know when something is wrong

Each response includes cache_age_seconds and is_stale so consuming agents can make their own freshness decisions.

What You Get

6 chains: Ethereum, Solana, BSC, Bitcoin, Tron, Arbitrum

16 metrics per chain:

  • TVL, stablecoins market cap
  • Chain fees and revenue (24h)
  • DEX volume, perps volume (24h)
  • App fees and revenue (24h)
  • Token price, market cap, trading volume
  • Token incentives (24h)
  • Bridged TVL, net inflows, active addresses (normally paywalled)

Two query modes:

  • All metrics: GET /metrics?chain=ethereum
  • Single metric: GET /metrics?chain=ethereum&metric=tvl

Pricing Comparison

DefiLlama Pro This API
Monthly cost $300 flat Pay-per-call
Per call ~$0.01 effective $0.01
Paywalled data Included Included
100 calls/day $300/mo $1/day
1,000 calls/day $300/mo $10/day

If your trading agent makes 200 calls a day, you're paying $2/day instead of $10/day (amortized). For testing and prototyping, the difference is even bigger -- you pay nothing when you're not calling.

Use Cases

Trading agents can monitor TVL drops and fee spikes as risk signals. When Ethereum's active addresses fall 20% in a day while net inflows go negative, that's a signal worth acting on.

Dashboard builders get a single endpoint for cross-chain comparison instead of stitching together multiple APIs.

Researchers can track capital rotation between chains by watching bridged TVL and net inflows over time.

Try It

The API is live on the Apify Store and available through ProxyGate for agent-to-agent access.

If you're building trading agents or DeFi dashboards and have feedback on which metrics or chains to add next, I'm all ears. The scraping pipeline is extensible -- adding Polygon, Avalanche, or Optimism is a config change.

Built from Nairobi with Crawlee, Puppeteer, and too many cups of coffee.

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