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Configuring Rate Limits

Solar Core is mainly used in the context of public services, providing desktop wallets with the necessary endpoints to function. Since they serve anonymous users and to protect against DDoS attacks, Solar Core nodes have strict rate limits. Enterprise users (such as exchanges) might encounter a problem creating large batches of transactions and broadcasting them. The rate limit can be configured in multiple ways to solve these problems.

Exceeding the Rate Limit

By default, rate limits are enabled on Solar Core nodes. When the rate limit is exceeded; a 429 HTTP status is returned.

Configuring the Rate Limit

You can fine tune or completely disable the node's rate limit by editing the .env file found at ~/.config/solar-core/{network}/.env. Find most important parameters below:

CORE_API_RATE_LIMIT_DISABLED=true
CORE_API_RATE_LIMIT_USER_LIMIT=300
CORE_API_RATE_LIMIT_WHITELIST=127.0.0.1,192.168.1.1,172.31.255.1

Setting CORE_API_RATE_LIMIT_DISABLED=true will globally disable all rate limits. For internal use this is safe. More fine-grained control may be exerted by using CORE_API_RATE_LIMIT_USER_LIMIT, which uses IP addresses to assign rate limits. The unit is requests/minute (default: 100 requests/per minute/per IP).

Excluding certain IP addresses from rate limiting can be achieved by setting CORE_API_RATE_LIMIT_WHITELIST= followed by comma separated list of IP addresses (default: 172.0.0.1).

Use case 1: Disable Rate Limits

warning

Make sure API is accessible only to your internal network and not visible to the outside world.

CORE_API_RATE_LIMIT_DISABLED=true

Use case 2: Whitelisting

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Instead of globally disabling rate limits it is possible to exclude certain IP addresses from rate limits and raise the global limits.

CORE_API_RATE_LIMIT_WHITELIST=127.0.0.1,192.168.1.1,172.31.255.1
CORE_API_RATE_LIMIT_USER_LIMIT=300