Quickstart

Getting an account

Accounts are created at constant-k.com/registration.

Plan activation

Plans are activated on the pricing page. Free includes Solana RPC for testing. Paid plans raise the limits and add WebSockets, Kaldera gRPC and ShredPrism. See Plans & Limits.

API key

The Endpoints section of My Account holds your API key and your endpoint URLs.

An environment variable holds the key:

export CK_API_KEY="YOUR_API_KEY"

A key committed to a repository, or shipped in browser code, is readable by anyone. See Key handling.

First call

getSlot is available on every plan, including Free.

curl "https://rpc-newyork.constant-k.com/?api-key=YOUR_API_KEY" \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"getSlot"}'

A successful call returns the slot number:

{ "jsonrpc": "2.0", "result": 447913193, "id": 1 }

401 or 403 means the key is missing or wrong. See Authentication.

The endpoint in other tools

The endpoint URL works anywhere that accepts a custom Solana RPC URL: wallets, trading bots, Jupiter, scripts and SDKs. It is the full URL, key included:

https://rpc-newyork.constant-k.com/?api-key=YOUR_API_KEY

The region closest to your servers gives the lowest latency. See Endpoints.