ARBITRUM ONEEasiest way to build and scale your app on Arbitrum
Access the entire backend stack you need to build on Arbitrum. RPC nodes, SDK, and the rest of the developer tools all in one platform.
Free key · 100K credits · no credit card
Instantly test a call onArbitrum One.
Hit a live Arbitrum One 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://arbitrum-one-mainnet.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 140 networks —
# solana-mainnet , ethereum-mainnet , base-mainnet …
Response
Two Arbitrum One networks. One key.
Arbitrum One MainnetArbitrum One SepoliaGlobal 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
What else works on Arbitrum One.
Two Arbitrum One networks, one URL.
Tatum RPC Router balances traffic across healthy nodes, fails over instantly, and uses caching plus method-aware routing for speed and reliability.
Reliable blockchain webhooks for your app.
Subscribe to wallets, contracts, and tokens on Arbitrum One. Verified events with retries and scale built in.
The easiest way to manage wallets at scale.
Launch MPC non-custodial Smart Wallets on Arbitrum One. One SDK for wallets, signing, and gas sponsorship.
Describe it. AI Builder does the rest.
AI Builder creates the frontend, wires the backend, and connects the APIs that power your application.
Plans that scale with Arbitrum One
The more you use, the lower your effective cost — plans get cheaper as usage grows.
Arbitrum One questions we get asked.
Arbitrum One 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 Arbitrum One RPC gateways with global load balancing and high uptime.
Connect to Tatum's Arbitrum One RPC Gateway using the endpoint format: arbitrum-one-mainnet.gateway.tatum.io or arbitrum-one-sepolia.gateway.tatum.io.
Tatum's RPC Gateway provides discovery endpoints:
/llms.txt: AI context and documentation for the network/_methods: Supported interfaces and RPC methods
Credits are consumed based on the complexity and resource requirements of each RPC method:
- 2 credits for Standard RPC methods
- 5 credits for the
eth_callmethod - 50 credits for Debug and Trace methods
Access Tatum services by authenticating with your API key using one of the following methods:
- X-API-Key in header (Recommended): Pass your API key in the
x-api-keyheader - Authorization Header (Bearer): Use
authorization: bearer {YOUR_API_KEY} - Authorization Header (Basic): Use HTTP Basic Authentication
See the Authentication & Security documentation. Get your API key by signing up at the Tatum Dashboard.
Yes. Tatum offers free Arbitrum One RPC endpoints suitable for development and testing. Free endpoints include rate limits. For production workloads, upgrade to a paid plan for higher throughput, archive data, and priority support.
Yes. Beyond RPC, Tatum offers indexed blockchain data APIs and real-time webhook notifications for Arbitrum One events so you can build wallets, dashboards, and alerts without operating your own indexing stack.