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Helius

Helius Solana RPC

Solana JSON-RPC and WebSocket endpoints with enhanced WebSockets, archival data, and staked connections.

Documentation Provider Profile APIs.io AsyncAPI GitHub

Helius Solana RPC is one of 20 APIs that Helius publishes on the APIs.io network, described by an AsyncAPI event-driven specification.

Tagged areas include JSON-RPC, Solana, and WebSocket. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

This event API exposes 20 operations across 10 channels, and defines 62 schemas. It is described by AsyncAPI 2.6.0, at version 2026-05-29.

The API connects through 5 servers: mainnet.helius-rpc.com/?api-key={apiKey} (wss), devnet.helius-rpc.com/?api-key={apiKey} (wss), beta.helius-rpc.com/?api-key={apiKey} (wss), atlas-mainnet.helius-rpc.com/?api-key={apiKey} (wss), mainnet.helius-rpc.com/?api-key={apiKey} (wss).

20 operations 10 channels 62 schemas

Metadata

The identity and technical contract details declared by the specification.

Specification
AsyncAPI 2.6.0
API Version
2026-05-29
Base URL
https://mainnet.helius-rpc.com/?api-key={apiKey}
Contact
Helius Developer Support
License
Proprietary (Helius Terms)
Resource Areas
1

Channels & Operations 20

Across 10 channels, the API surfaces 20 operations. Each is listed below with its action, channel, parameters, and response codes.

Channels 20
SUB
accountSubscribe
Account change notifications.
accountNotification body
PUB
accountSubscribe
Open an accountSubscribe subscription.
accountSubscribe body
SUB
blockSubscribe
Block notifications.
blockNotification body
PUB
blockSubscribe
Open a blockSubscribe subscription.
blockSubscribe body
SUB
logsSubscribe
Log notifications.
logsNotification body
PUB
logsSubscribe
Open a logsSubscribe subscription.
logsSubscribe body
SUB
programSubscribe
Program account notifications.
programNotification body
PUB
programSubscribe
Open a programSubscribe subscription.
programSubscribe body
SUB
signatureSubscribe
Signature confirmation notifications.
signatureNotification body
PUB
signatureSubscribe
Open a signatureSubscribe subscription.
signatureSubscribe body
SUB
slotSubscribe
Slot notifications.
slotNotification body
PUB
slotSubscribe
Open a slotSubscribe subscription.
slotSubscribe body
SUB
slotsUpdatesSubscribe
Slot update notifications.
slotsUpdatesNotification body
PUB
slotsUpdatesSubscribe
Open a slotsUpdatesSubscribe subscription.
slotsUpdatesSubscribe body
SUB
voteSubscribe
Vote notifications.
voteNotification body
PUB
voteSubscribe
Open a voteSubscribe subscription.
voteSubscribe body
SUB
rootSubscribe
Root slot notifications.
rootNotification body
PUB
rootSubscribe
Open a rootSubscribe subscription.
rootSubscribe body
SUB
transactionSubscribe
Filtered transaction notifications.
transactionNotification body
PUB
transactionSubscribe
Open a transactionSubscribe subscription.
transactionSubscribe body

Messages & Schemas 62

The contract defines 62 schemas that model the data carried by its messages. The most detailed are AccountInfo (6 properties), TransactionSubscribeFilter (6 properties), TransactionSubscribeOptions (5 properties), JsonRpcRequestBase (4 properties). Each schema is shown below with its type and property counts.

AccountSubscribeRequest
message
JSON-RPC request opening an accountSubscribe subscription.
AccountUnsubscribeRequest
message
BlockSubscribeRequest
message
BlockUnsubscribeRequest
message
LogsSubscribeRequest
message
LogsUnsubscribeRequest
message
ProgramSubscribeRequest
message
ProgramUnsubscribeRequest
message
SignatureSubscribeRequest
message
SignatureUnsubscribeRequest
message
SlotSubscribeRequest
message
SlotUnsubscribeRequest
message
SlotsUpdatesSubscribeRequest
message
SlotsUpdatesUnsubscribeRequest
message
VoteSubscribeRequest
message
VoteUnsubscribeRequest
message
RootSubscribeRequest
message
RootUnsubscribeRequest
message
TransactionSubscribeRequest
message
Helius enhanced subscription opening a filtered transaction stream.
TransactionUnsubscribeRequest
message
JsonRpcResponse
message
Response to a subscribe / unsubscribe request — carries the subscription id (subscribe) or a boolean (unsubscribe).
AccountNotification
message
BlockNotification
message
LogsNotification
message
ProgramNotification
message
SignatureNotification
message
SlotNotification
message
SlotsUpdatesNotification
message
VoteNotification
message
RootNotification
message
TransactionNotification
message
Helius enhanced transactionNotification payload.
JsonRpcRequestBase
object
4 properties 3 required
JsonRpcResponse
object
4 properties 2 required
JsonRpcError
object
3 properties 2 required
JsonRpcNotificationBase
object
3 properties 3 required
Commitment
string
Encoding
string
Context
object
2 properties 1 required
AccountInfo
object
6 properties 4 required
UnsubscribeRequestPayload
object
AccountSubscribeRequestPayload
object
AccountNotificationPayload
object
BlockSubscribeRequestPayload
object
BlockNotificationPayload
object
LogsSubscribeRequestPayload
object
LogsNotificationPayload
object
ProgramSubscribeRequestPayload
object
ProgramNotificationPayload
object
SignatureSubscribeRequestPayload
object
SignatureNotificationPayload
object
SlotSubscribeRequestPayload
object
SlotNotificationPayload
object
SlotsUpdatesSubscribeRequestPayload
object
SlotsUpdatesNotificationPayload
object
VoteSubscribeRequestPayload
object
VoteNotificationPayload
object
RootSubscribeRequestPayload
object
RootNotificationPayload
object
TransactionSubscribeFilter
object
Filter controlling which transactions trigger transactionNotification. All fields optional; combine for precise matching. Account lists support up to 50,000 ad…
6 properties
TransactionSubscribeOptions
object
Optional shaping of the notification payload.
5 properties
TransactionSubscribeRequestPayload
object
TransactionNotificationPayload
object

Specification

The full machine-readable AsyncAPI contract behind this narrative.

Source

helius-asyncapi.yml Raw ↑

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#JSON-RPC#Solana#WebSocket
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API Details
ID
helius:rpc
Base URL
https://mainnet.helius-rpc.com/?api-key={apiKey}
Docs
https://www.helius.dev/docs/rpc
Provider
Helius
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