Alchemy API vs Polygon.io API: Which API for AI agents?
Category: Fintech & Banking
Alchemy API scores higher overall (4/10 vs 3/10). For most agent use cases, start with Alchemy API. Switch to Polygon.io API if you specifically need its capabilities or you're already locked into its ecosystem.
Score breakdown
| Alchemy API | Polygon.io API | |
|---|---|---|
| Overall score | 4/10 | 3/10 |
| CLI relevance | 8 | 8 |
| Quality | 5 | 4 |
| Pricing | freemium | freemium |
| Install | npm install alchemy-sdk | npm install @polygon.io/client-js |
Agent-friendliness signals
Only Alchemy API
No unique signals
Both
- ✓Official SDK
- ✓Env var auth
- ✓Headless compatible
- ✓JSON response
- ✓curl/CLI docs
- ✓Reasonable rate limits
Only Polygon.io API
No unique signals
Capabilities
Only Alchemy API
- • query blockchain data
- • send transactions
- • get nft data
- • get token balances
Both
No shared capabilities
Only Polygon.io API
- • get stock prices
- • get options data
- • get forex data
- • get crypto data
- • get market news
When to choose each
Choose Alchemy API when...
- -Best Web3 infrastructure - reliable node access across chains
- -Enhanced APIs go beyond raw RPC - NFT, token, webhook support
- -Generous free tier - 300M compute units/month
Choose Polygon.io API when...
- -Real-time and historical market data for stocks, options, crypto, forex
- -WebSocket streaming for live tick data
- -Flat pricing - unlimited API calls on paid plans
Full scores
For full scoring details, install gotchas, and reviews:
Frequently asked questions
Which is better for AI agents - Alchemy API or Polygon.io API?
Alchemy API scores higher overall (4/10 vs 3/10). For most agent use cases, start with Alchemy API. Switch to Polygon.io API if you specifically need its capabilities or you're already locked into its ecosystem.
Can I use Alchemy API and Polygon.io API together?
Technically yes - they're separate APIs, so nothing stops you from calling both. In practice, most teams pick one and stick with it to avoid maintaining two SDKs and two sets of API keys. The exception is if each one covers a use case the other doesn't.
What pricing model do Alchemy API and Polygon.io API use?
Alchemy API: freemium. Polygon.io API: freemium. For exact rates, check each provider's pricing page directly - prices change and we don't track real-time pricing here.