Geyser gRPC (ThorStreamer, Yellowstone)

What it is

Streaming API that delivers parsed transactions and account updates via gRPC after slots are processed by a validator.

Latency

~100-200ms — Data is available after the validator processes the slot but before network-wide confirmation.

Data format

Structured protobuf messages containing:

• Parsed transactions with instructions

• Account updates with before/after states

• Slot notifications

• Block metadata

Pros

• Parsed, ready-to-use data

• Reliable TCP delivery (no packet loss)

• Filter by program, account, or transaction type

• Easier to integrate than shreds

Cons

• Slower than ShredStream

• Requires gRPC client implementation

• Limited historical replay

• Still requires dedicated infrastructure

Best for

• Trading bots

• Real-time indexers

• DeFi applications

• Account monitoring

Example use case

A trading bot subscribes to a specific DEX program, receives parsed swap instructions, and updates internal price feeds in real-time.