> For the complete documentation index, see [llms.txt](https://docs.triton.one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.triton.one/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls.md).

# Unary calls

One-shot Dragon's Mouth gRPC calls: getLatestBlockhash, getBlockHeight, getSlot, isBlockhashValid, getVersion, ping, and subscribeReplayInfo.

## Chain position and blockhash

| Method                                                                                                             | What it returns                                                    |
| ------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------ |
| [`getLatestBlockhash`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/getlatestblockhash.md) | The latest blockhash and `lastValidBlockHeight`.                   |
| [`getBlockHeight`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/getblockheight.md)         | The current block height.                                          |
| [`getSlot`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/getslot.md)                       | The current slot.                                                  |
| [`isBlockhashValid`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/isblockhashvalid.md)     | Whether the server holds a recent blockhash at a commitment level. |

## Service and connection

| Method                                                                                                               | What it returns                                        |
| -------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------ |
| [`getVersion`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/getversion.md)                   | The Yellowstone gRPC service version.                  |
| [`ping`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/ping.md)                               | The `count` you sent.                                  |
| [`subscribeReplayInfo`](/solana/rpc-methods/real-time-streaming/yellowstone-grpc/unary-calls/subscribereplayinfo.md) | The first slot available for replay on a subscription. |

***

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