HARMONYReliable components for your project on one site: RPC nodes, SDKs, and more tools. Discover industry standards.
Free key · 100K credits · no credit card
Hit a live Harmony RPC node from here — pick a network, choose a method, and see the response in seconds. Same endpoints you'll use in production.
Request
curl --request POST \ --url 'https://harmony-mainnet-s0.gateway.tatum.io' \ --header 'accept: application/json' \ --header 'content-type: application/json' \ --header 'x-api-key: YOUR_API_KEY' \ --data '{"id":1,"jsonrpc":"2.0","method":"eth_blockNumber"}'
# swap the subdomain for any of 142 networks —
# solana-mainnet , ethereum-mainnet , base-mainnet …
Response
Harmony Mainnet S0Harmony Testnet S0Harmony Devnet S0Global Load Balancer
Route to nearest node
Batch RPC Calls
Multiple requests at once
Archive Nodes
Historical blockchain data
Debug & Trace
Advanced debugging
Advanced Analytics
Usage & performance
Bring Your Own RPC
Custom RPC gateways
Tatum RPC Router balances traffic across healthy nodes, fails over instantly, and uses caching plus method-aware routing for speed and reliability.
AI Builder creates the frontend, wires the backend, and connects the APIs that power your application.
The more you use, the lower your effective cost — plans get cheaper as usage grows.
Same key, same SDK, same URL shape. Switch the slug and the call still works.
Harmony RPC is a remote procedure call interface that lets your application read blockchain data and submit transactions without running your own node. Tatum provides free and paid Harmony RPC gateways with global load balancing and high uptime.
