​
Unary Methods

These are simple request/response gRPC methods (not streaming).

​
SubscribeReplayInfo

Returns information about the earliest slot available for replay subscriptions. Parameters: None (empty request message)
​
first_available
uint64
The first slot available for replay (optional — may be absent if replay is not supported).
const response = await client.subscribeReplayInfo();
console.log("First available slot:", response.firstAvailable);

​
Ping

Health check that echoes back a count value.
​
count
int32
required
A counter value to echo back.
​
count
int32
The echoed counter value.
const response = await client.ping(1);
console.log("Pong:", response);

​
GetLatestBlockhash

Returns the latest blockhash and last valid block height.
​
commitment
CommitmentLevel
Commitment level: PROCESSED, CONFIRMED, or FINALIZED.
​
slot
uint64
Slot of the blockhash.
​
blockhash
string
Latest blockhash.
​
last_valid_block_height
uint64
Last block height at which the blockhash is valid.
const response = await client.getLatestBlockhash(CommitmentLevel.CONFIRMED);
console.log(`Blockhash: ${response.blockhash}`);
console.log(`Valid until block: ${response.lastValidBlockHeight}`);

​
GetBlockHeight

Returns the current block height.
​
commitment
CommitmentLevel
Commitment level.
​
block_height
uint64
Current block height.
const response = await client.getBlockHeight(CommitmentLevel.CONFIRMED);
console.log(`Block height: ${response}`);

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GetSlot

Returns the current slot.
​
commitment
CommitmentLevel
Commitment level.
​
slot
uint64
Current slot number.
const response = await client.getSlot(CommitmentLevel.CONFIRMED);
console.log(`Current slot: ${response}`);

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IsBlockhashValid

Checks whether a given blockhash is still valid.
​
blockhash
string
required
The blockhash to validate.
​
commitment
CommitmentLevel
Commitment level.
​
slot
uint64
Slot at which validity was checked.
​
valid
bool
true if the blockhash is still valid.
const response = await client.isBlockhashValid("YOUR_BLOCKHASH");
console.log(`Valid: ${response.valid}, Slot: ${response.slot}`);

​
GetVersion

Returns the Yellowstone gRPC server version. Parameters: None
​
version
string
Server version string.
const response = await client.getVersion();
console.log(`Version: ${response}`);