userFRM · userFRM · May 6, 2026 · May 6, 2026 · May 6, 2026 · May 6, 2026
diff --git a/.gitattributes b/.gitattributes
@@ -2,14 +2,6 @@
 # `generate_sdk_surfaces --check` doesn't false-positive on Windows.
 ffi/src/endpoint_request_options.rs  text eol=lf linguist-generated=true
 ffi/src/endpoint_with_options.rs     text eol=lf linguist-generated=true
-sdks/go/endpoint_options.go          text eol=lf linguist-generated=true
-sdks/go/endpoint_request_options.h.inc text eol=lf linguist-generated=true
-sdks/go/endpoint_with_options.h.inc  text eol=lf linguist-generated=true
-sdks/go/fpss_methods.go              text eol=lf linguist-generated=true
-sdks/go/historical.go                text eol=lf linguist-generated=true
-sdks/go/tick_converters.go           text eol=lf linguist-generated=true
-sdks/go/tick_structs.go              text eol=lf linguist-generated=true
-sdks/go/utilities.go                 text eol=lf linguist-generated=true
 sdks/cpp/include/endpoint_options.hpp.inc    text eol=lf linguist-generated=true
 sdks/cpp/include/endpoint_request_options.h.inc text eol=lf linguist-generated=true
 sdks/cpp/include/endpoint_with_options.h.inc text eol=lf linguist-generated=true
@@ -20,7 +12,6 @@ sdks/cpp/src/fpss.cpp.inc            text eol=lf linguist-generated=true
 sdks/cpp/src/historical.cpp.inc      text eol=lf linguist-generated=true
 sdks/cpp/src/lifecycle.cpp.inc       text eol=lf linguist-generated=true
 sdks/cpp/src/utilities.cpp.inc       text eol=lf linguist-generated=true
-sdks/go/validate.go                  text eol=lf linguist-generated=true
 sdks/python/src/historical_methods.rs text eol=lf linguist-generated=true
 sdks/python/src/streaming_methods.rs text eol=lf linguist-generated=true
 scripts/validate_python.py           text eol=lf linguist-generated=true
@@ -36,7 +27,6 @@ sdks/typescript/src/streaming_methods.rs text eol=lf linguist-generated=true
 sdks/typescript/src/tick_classes.rs  text eol=lf linguist-generated=true
 sdks/typescript/src/fpss_event_classes.rs text eol=lf linguist-generated=true
 sdks/typescript/src/buffered_event.rs text eol=lf linguist-generated=true
-sdks/go/fpss_event_structs.go        text eol=lf linguist-generated=true
 sdks/cpp/include/fpss_event_structs.h.inc text eol=lf linguist-generated=true
 
 # Generated validator surfaces that were missed from the original list.

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
@@ -45,10 +45,3 @@ updates:
       patch-minor:
         update-types: ["patch", "minor"]
 
-  - package-ecosystem: "gomod"
-    directory: "/sdks/go"
-    schedule:
-      interval: "weekly"
-    groups:
-      go-patch-minor:
-        update-types: ["patch", "minor"]
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -77,9 +77,6 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           components: clippy
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.23"
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
@@ -123,9 +120,6 @@ jobs:
             ffi_artifact: ffi-windows-msvc-x86_64
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.23"
       - uses: actions/download-artifact@v8
         with:
           name: ${{ matrix.ffi_artifact }}
@@ -137,19 +131,6 @@ jobs:
           path: target/x86_64-pc-windows-gnu/release/
       - run: cmake -S sdks/cpp -B build/cpp
       - run: cmake --build build/cpp --config Release --target thetadatadx_cpp
-      - shell: bash
-        working-directory: sdks/go
-        run: |
-          set -euo pipefail
-          if [ "${{ runner.os }}" = "Linux" ]; then
-            export LD_LIBRARY_PATH="${{ github.workspace }}/target/release"
-          elif [ "${{ runner.os }}" = "macOS" ]; then
-            export DYLD_LIBRARY_PATH="${{ github.workspace }}/target/release"
-          else
-            export PATH="${{ github.workspace }}/target/x86_64-pc-windows-gnu/release:$PATH"
-            export CGO_LDFLAGS="-L${{ github.workspace }}/target/x86_64-pc-windows-gnu/release"
-          fi
-          go test ./...
 
   build-ffi:
     name: Build FFI (${{ matrix.os }})

diff --git a/.github/workflows/live.yml b/.github/workflows/live.yml
@@ -56,9 +56,6 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.23"
       - name: Materialize creds.txt
         shell: python
         env:
@@ -92,16 +89,6 @@ jobs:
         env:
           LD_LIBRARY_PATH: ${{ github.workspace }}/target/release
         run: ./build/cpp/thetadatadx_fpss_smoke creds.txt
-      - shell: bash
-        env:
-          LD_LIBRARY_PATH: ${{ github.workspace }}/target/release
-          CGO_LDFLAGS: -L${{ github.workspace }}/target/release
-        run: cd sdks/go && go run ./cmd/live_smoke ../../creds.txt
-      - shell: bash
-        env:
-          LD_LIBRARY_PATH: ${{ github.workspace }}/target/release
-          CGO_LDFLAGS: -L${{ github.workspace }}/target/release
-        run: cd sdks/go && go run ./cmd/fpss_smoke ../../creds.txt
       - name: FLATFILES synthetic golden (decoder)
         # Runs against a hand-built blob in the repo; no live wire. This
         # is the always-on regression gate for the FIT decoder + CSV
@@ -138,9 +125,6 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.23"
       - name: Materialize creds.txt
         shell: python
         env:
@@ -168,11 +152,6 @@ jobs:
         env:
           LD_LIBRARY_PATH: ${{ github.workspace }}/target/release
         run: ./build/cpp/thetadatadx_validate creds.txt
-      - shell: bash
-        env:
-          LD_LIBRARY_PATH: ${{ github.workspace }}/target/release
-          CGO_LDFLAGS: -L${{ github.workspace }}/target/release
-        run: cd sdks/go && go run ./cmd/validate ../../creds.txt
   release-validation:
     name: Full Release Validation
     needs: endpoint-validation
@@ -182,9 +161,6 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-rust-deps
-      - uses: actions/setup-go@v6
-        with:
-          go-version: "1.23"
       - uses: actions/setup-python@v6
         with:
           python-version: "3.12"

diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -7,6 +7,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [8.0.29] - 2026-05-06
+
+### Removed
+
+- **Go SDK.** The cgo bridge between Rust's C ABI and Go's runtime
+  carries per-call overhead that masks the upstream throughput this
+  SDK is engineered for. Users who need Go bindings can build their
+  own cgo wrapper against the unchanged C ABI in `crates/ffi/` —
+  header at `sdks/cpp/include/thetadx.h`, all FFI types and free fns
+  exported as `tdx_*` symbols.
+
+  Closes #481.
+
 ## [8.0.28] - 2026-05-06
 
 ### Breaking

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -18,7 +18,6 @@ for the FLATFILES coverage matrix.
 - **Python 3.9+** - for the Python SDK
 - **maturin** - for building the PyO3 Python bindings (`pip install "maturin>=1.9.4,<2.0"`)
 - **Node.js 18+** - for the TypeScript/Node.js SDK
-- **Go 1.21+** - for the Go SDK
 
 Note: `protoc` is required even if you're not modifying `.proto` files, because `build.rs` compiles protos during `cargo build`.
 
@@ -64,7 +63,6 @@ cargo test --manifest-path tools/cli/Cargo.toml
 # 6. Language SDK smoke checks (if modified)
 cargo check --manifest-path sdks/python/Cargo.toml
 (cd sdks/typescript && npm run build)
-(cd sdks/go && LD_LIBRARY_PATH=../../target/release go test ./...)
 c++ -std=c++17 -fsyntax-only -I sdks/cpp/include sdks/cpp/src/thetadx.cpp
 cmake -S sdks/cpp -B build/cpp
 cmake --build build/cpp --target thetadatadx_cpp
@@ -114,7 +112,6 @@ We follow [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/)
 | `ffi` | `ffi/` |
 | `python` | `sdks/python/` |
 | `typescript` | `sdks/typescript/` |
-| `go` | `sdks/go/` |
 | `cpp` | `sdks/cpp/` |
 | `cli` | `tools/cli/` |
 | `mcp` | `tools/mcp/` |

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/README.md b/README.md
@@ -1,6 +1,6 @@
 # ThetaDataDx
 
-Rust SDK for ThetaData market data — single Rust core, five language surfaces (Rust, Python, TypeScript, Go, C++).
+Rust SDK for ThetaData market data — single Rust core, four language surfaces (Rust, Python, TypeScript, C++).
 
 [![build](https://github.com/userFRM/ThetaDataDx/actions/workflows/ci.yml/badge.svg)](https://github.com/userFRM/ThetaDataDx/actions/workflows/ci.yml)
 [![license](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](./LICENSE)
@@ -10,18 +10,18 @@ Rust SDK for ThetaData market data — single Rust core, five language surfaces
 [![Docs](https://img.shields.io/docsrs/thetadatadx)](https://docs.rs/thetadatadx)
 [![Discord](https://img.shields.io/badge/Discord-community-5865F2.svg?logo=discord&logoColor=white)](https://discord.thetadata.us/)
 
-`thetadatadx` is a native Rust SDK for [ThetaData](https://thetadata.us) market data. It connects directly to ThetaData's three public surfaces — MDDS (historical request/response over gRPC), FPSS (real-time streaming over TCP), and FLATFILES (whole-universe daily blobs over the legacy MDDS port) — decodes ticks in-process, and exposes a typed API across Rust, Python, TypeScript, Go, and C++ from a single Rust core. No JVM, no subprocess, no IPC serialization.
+`thetadatadx` is a native Rust SDK for [ThetaData](https://thetadata.us) market data. It connects directly to ThetaData's three public surfaces — MDDS (historical request/response over gRPC), FPSS (real-time streaming over TCP), and FLATFILES (whole-universe daily blobs over the legacy MDDS port) — decodes ticks in-process, and exposes a typed API across Rust, Python, TypeScript, and C++ from a single Rust core. No JVM, no subprocess, no IPC serialization. Go consumers can build a thin cgo wrapper against the unchanged C ABI in [`ffi/`](ffi/) — header at [`sdks/cpp/include/thetadx.h`](sdks/cpp/include/thetadx.h), all FFI types and free fns exported as `tdx_*` symbols.
 
 > [!IMPORTANT]
 > A valid [ThetaData](https://thetadata.us) subscription is required. The SDK authenticates against ThetaData's Nexus API using your account credentials.
 
 ## Highlights
 
-- **Typed everywhere.** 61 ThetaData endpoints exposed as typed methods across all five SDKs; no raw JSON or protobuf on the public surface.
+- **Typed everywhere.** 61 ThetaData endpoints exposed as typed methods across all four SDKs; no raw JSON or protobuf on the public surface.
 - **Arrow-backed DataFrames.** Python `to_arrow()` / `to_pandas()` / `to_polars()` pipe through shared Arrow buffers.
 - **SPKI-pinned FPSS TLS.** Public-key pinning on the FPSS streaming handshake.
 - **FIT decoder + SPSC ring buffer** on the FPSS path. Decode cost is measured in the benchmarks under `crates/thetadatadx/benches/`.
-- **Shared FFI layer.** Go, C++, and Node.js go through the same `extern "C"` layer; the Python wheel uses PyO3 ABI3 directly.
+- **Shared FFI layer.** C++ and Node.js go through the same `extern "C"` layer; the Python wheel uses PyO3 ABI3 directly. The C ABI is also the supported integration path for any third-party Go/C/other-language consumer that wants to roll their own wrapper.
 - **Covers all three public surfaces.** MDDS gRPC endpoints, FPSS wire format with reconnect semantics, and the FLATFILES daily-blob protocol — every transport speaks directly to ThetaData's production servers from a single client. See the [parity checklist](docs/java-parity-checklist.md) and the [vendor flat-file reference](https://http-docs.thetadata.us/operations/get-v2-flat-file-getting-started.html).
 - **FLATFILES daily blobs.** Pull whole-universe `(sec_type, req_type, date)` blobs over the legacy MDDS port; decode to vendor-byte CSV, JSONL, or a typed `Vec<FlatFileRow>` in memory. Cross-language coverage is tracked under the binding issues; the Rust core is shipped today.
 
@@ -100,32 +100,6 @@ for (const t of tdx.stockHistoryEOD('AAPL', '20240101', '20240301')) {
 }
 ```
 
-### Go
-
-```sh
-go get github.com/userFRM/ThetaDataDx/sdks/go
-```
-
-```go
-package main
-
-import (
-    "fmt"
-    thetadata "github.com/userFRM/ThetaDataDx/sdks/go"
-)
-
-func main() {
-    tdx, err := thetadata.ConnectFromFile("creds.txt", thetadata.Production())
-    if err != nil { panic(err) }
-    defer tdx.Close()
-    ticks, _ := tdx.StockHistoryEod("AAPL", "20240101", "20240301")
-    for _, t := range ticks {
-        fmt.Printf("%d: O=%.2f H=%.2f L=%.2f C=%.2f V=%d\n",
-            t.Date, t.Open, t.High, t.Low, t.Close, t.Volume)
-    }
-}
-```
-
 ### C++
 
 ```cpp
@@ -202,7 +176,6 @@ flowchart TB
 
     core -->|PyO3 / maturin| python["Python SDK<br/>(pyo3 · Arrow)"]
     ffi -->|napi-rs| ts["TypeScript SDK<br/>(N-API · BigInt)"]
-    ffi -->|cgo| go["Go SDK"]
     ffi -->|extern C| cpp["C++ SDK<br/>(RAII header-only)"]
     core -->|tonic| rust["Rust consumer<br/>(direct crate)"]
 
@@ -211,17 +184,16 @@ flowchart TB
     classDef sdkStyle fill:#14532d,stroke:#052e16,color:#fff
     class thetadatadx,tdbe coreStyle
     class ffi ffiStyle
-    class python,ts,go,cpp,rust sdkStyle
+    class python,ts,cpp,rust sdkStyle
 ```
 
 | Layer | Crate / package | Purpose |
 |-------|-----------------|---------|
 | Encoding / types | [`crates/tdbe`](crates/tdbe/) | Tick structs, FIT/FIE codecs, Greeks, Price |
 | Core SDK | [`crates/thetadatadx`](crates/thetadatadx/) | MDDS gRPC client, FPSS streaming, auth |
-| C FFI | [`ffi/`](ffi/) | Stable `extern "C"` layer consumed by Go, C++, Node.js |
+| C FFI | [`ffi/`](ffi/) | Stable `extern "C"` layer consumed by C++, Node.js, and any third-party C/Go consumer |
 | Python | [`sdks/python`](sdks/python/) | PyO3 / maturin wheel with Arrow DataFrame adapter |
 | TypeScript | [`sdks/typescript`](sdks/typescript/) | napi-rs prebuilt binary |
-| Go | [`sdks/go`](sdks/go/) | CGo bindings over the FFI layer |
 | C++ | [`sdks/cpp`](sdks/cpp/) | RAII header-only wrapper |
 | CLI | [`tools/cli`](tools/cli/) | `tdx` CLI — every generated historical endpoint from the command line |
 | MCP | [`tools/mcp`](tools/mcp/) | MCP server - gives clients access to every generated historical endpoint plus offline tools over JSON-RPC |

diff --git a/ROADMAP.md b/ROADMAP.md
@@ -142,7 +142,6 @@ Server retention window: 7 calendar days. Older history: contact ThetaData sales
 | REST/WS server (`tools/server`) | Pending | #432 |
 | Python (`sdks/python`) | Pending | #435 |
 | TypeScript (`sdks/typescript`) | Pending | #436 |
-| Go (`sdks/go`) | Pending | #437 |
 | C++ (`sdks/cpp`) | Pending | #438 |
 | `sdk_surface.toml` declarative spec | Pending | #439 |
 
@@ -169,11 +168,10 @@ Server retention window: 7 calendar days. Older history: contact ThetaData sales
 
 ### Cross-language parity for `utils`
 
-The Rust SDK exposes `thetadatadx::utils::{conditions, exchange, sequences}` for post-processing tick records. The Python, TypeScript, Go, and C++ SDKs do **not** currently expose any of these helpers. Tracked in issue #424.
+The Rust SDK exposes `thetadatadx::utils::{conditions, exchange, sequences}` for post-processing tick records. The Python, TypeScript, and C++ SDKs do **not** currently expose any of these helpers. Tracked in issue #424.
 
 - [ ] **Python** — bind `thetadatadx.utils.{conditions, exchange, sequences}` via PyO3.
 - [ ] **TypeScript** — bind via napi-rs under the same `utils.*` namespace.
-- [ ] **Go** — flat helper functions `thetadatadx.UtilsConditionName(code)`, etc.
 - [ ] **C++** — header at `sdks/cpp/include/thetadx_utils.h` with `extern "C"` bindings plus thin C++ wrappers.
 
 ### MDDS endpoint coverage on subscription-tier-blocked rows
@@ -193,7 +191,7 @@ The 7 SKIP rows in the MDDS validator are subscription-blocked on the current te
 
 ### Cross-SDK parity validation
 
-- [ ] Run the validator matrix through the Python, TypeScript, Go, and C++ SDKs and compare row-for-row against the Rust artifact. Locks in the contract that all four bindings return identical data for every endpoint.
+- [ ] Run the validator matrix through the Python, TypeScript, and C++ SDKs and compare row-for-row against the Rust artifact. Locks in the contract that all three bindings return identical data for every endpoint.
 
 ### Upstream features
 

diff --git a/crates/thetadatadx/Cargo.toml b/crates/thetadatadx/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "thetadatadx"
-version = "8.0.28"
+version = "8.0.29"
 edition.workspace = true
 rust-version.workspace = true
 authors.workspace = true