Compute Units (CUs)

We use Compute Units as an alternative to the ‘pay-per-click’ method. It provides more flexibility and economy, and also reflects the individual character of usage.

What Are Compute Units and How Are They Charged

In RPC Fast API, we don’t use the "pay-per-request" system. It is common among other blockchain services to measure the RPC request usage. Instead, we charge clients according to the Compute Units (CU) system. Here you’ll find answers to the main questions about CUs explained.

Free plan has 300M CUs available. This balance allows you to use methods with a specific price for the application. More RPC requests you have, the more methods or Compute Units you use. It enables you to optimize your spending and calculate the usage more precisely. Summing up, you only pay for procedures you apply.

Compute Units of Each RPC Method

We calculate the cost of each method according to the computational capacities, time, and CPU spent on each action. Some requests take much more CUs than others.

Supported Methods

BSC, Ethereum, and Polygon

eth_call	25
trace_get	17
web3_sha3	15
trace_call	75
eth_chainId	5
eth_getCode	19
eth_getLogs	65
eth_syncing	5
net_version	5
trace_block	24
erigon_forks	24
eth_accounts	5
eth_gasPrice	19
eth_getProof	21
trace_filter	75
eth_newFilter	20
eth_subscribe	10
net_listening	5
erigon_issuance	24
eth_getBalance	19
trace_callMany	75
eth_blockNumber	5
eth_estimateGas	75
eth_unsubscribe	10
eth_getStorageAt	17
eth_getFilterLogs	75
trace_transaction	26
eth_getBlockByHash	21
eth_newBlockFilter	20
web3_clientVersion	5
eth_uninstallFilter	10
erigon_getLogsByHash	24
eth_getBlockByNumber	16
eth_getBlockReceipts	500
eth_getFilterChanges	20
trace_rawTransaction	75
erigon_getHeaderByHash	24
eth_sendRawTransaction	200
eth_getTransactionCount	26
parity_getBlockReceipts	500
trace_replayTransaction	2800
alchemy_getTokenBalances	26
alchemy_getTokenMetadata	16
erigon_getHeaderByNumber	24
eth_getTransactionByHash	17
alchemy_getAssetTransfers	150
alchemy_getTokenAllowance	19
eth_getTransactionReceipt	15
eth_sendPrivateTransaction	250
eth_cancelPrivateTransaction	250
trace_replayBlockTransactions	2800
alchemy_getTransactionReceipts	250
eth_newPendingTransactionFilter	20
eth_getBlockTransactionCountByHash	20
eth_getBlockTransactionCountByNumber	20
eth_getTransactionByBlockHashAndIndex	15
eth_getTransactionByBlockNumberAndIndex	15

Ethereum only

Method	CUs
eth_protocolVersion	5
eth_createAccessList	10
eth_feeHistory	10
eth_maxPriorityFeePerGas	10
eth_getUncleByBlockHashAndIndex	15
eth_getUncleByBlockNumberAndIndex	15
eth_getUncleCountByBlockHash	15
eth_getUncleCountByBlockNumber	15

Polygon API

Method	CUs
bor_getAuthor	15
bor_getCurrentProposer	15
bor_getCurrentValidators	15
bor_getRootHash	15
bor_getSignersAtHash	15
eth_getTransactionReceiptsByBlock	250

Transaction Simulation

All simulations have a fixed price of 2000 CU.

How Do We Charge CUs Monthly?

We count all requests received from every single account. Each payment plan has its limitations. Regardless of their number, we charge you with calculating the whole number of CUs for all apps.

Websocket Subscription

RPC Fast API charges the subscription by bandwidth, 0,04 CU for every byte.

What Happens After Running Out the Monthly Quota?

After you spend all CUs in your subscription, the request will fail and return an HTTPS 429 error with an error code -32005.

{"error":"invalid or empty api key"}