diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 1067f0e6..2f3468a3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -7,6 +7,27 @@ on:
     branches: [main]
 
 jobs:
+  format_and_lint_interface:
+    name: Format & Lint Interface
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          clippy: true
+          rustfmt: true
+          cargo-cache-key: cargo-interface-lint
+          cargo-cache-fallback-key: cargo-interface
+
+      - name: Format
+        run: pnpm interface:format
+
+      - name: Lint
+        run: pnpm interface:lint
+
   format_and_lint_programs:
     name: Format & Lint Programs
     runs-on: ubuntu-latest
@@ -81,26 +102,6 @@ jobs:
       - name: Run cargo-audit
         run: pnpm rust:audit
 
-  semver_rust:
-    name: Check semver Rust
-    runs-on: ubuntu-latest
-    steps:
-      - name: Git Checkout
-        uses: actions/checkout@v4
-
-      - name: Setup Environment
-        uses: ./.github/actions/setup
-        with:
-          cargo-cache-key: cargo-semver
-
-      - name: Install cargo-audit
-        uses: taiki-e/install-action@v2
-        with:
-          tool: cargo-semver-checks
-
-      - name: Run semver checks
-        run: pnpm rust:semver
-
   spellcheck_rust:
     name: Spellcheck Rust
     runs-on: ubuntu-latest
@@ -138,6 +139,9 @@ jobs:
       - name: Build Programs
         run: pnpm programs:build
 
+      - name: Build p-memo
+        run: pnpm p-memo:build
+
       - name: Upload Program Builds
         uses: actions/upload-artifact@v4
         with:
@@ -151,6 +155,23 @@ jobs:
           path: ./**/*.so
           key: ${{ runner.os }}-builds-${{ github.sha }}
 
+  test_interface:
+    name: Test Interface
+    runs-on: ubuntu-latest
+    needs: format_and_lint_interface
+    steps:
+      - name: Git Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Environment
+        uses: ./.github/actions/setup
+        with:
+          cargo-cache-key: cargo-interface-tests
+          cargo-cache-fallback-key: cargo-interface
+
+      - name: Test
+        run: pnpm interface:test
+
   test_programs:
     name: Test Programs
     runs-on: ubuntu-latest
@@ -169,6 +190,9 @@ jobs:
       - name: Test Programs
         run: pnpm programs:test
 
+      - name: Test p-memo
+        run: pnpm p-memo:test
+
   generate_clients:
     name: Check Client Generation
     runs-on: ubuntu-latest
diff --git a/Cargo.lock b/Cargo.lock
index dd6f9293..5b593f7f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -7094,6 +7094,7 @@ dependencies = [
  "solana-program-test",
  "solana-pubkey",
  "solana-sdk",
+ "spl-memo-interface",
 ]
 
 [[package]]
@@ -7117,6 +7118,14 @@ dependencies = [
  "thiserror 2.0.12",
 ]
 
+[[package]]
+name = "spl-memo-interface"
+version = "1.0.0"
+dependencies = [
+ "solana-instruction",
+ "solana-pubkey",
+]
+
 [[package]]
 name = "stable_deref_trait"
 version = "1.2.0"
diff --git a/Cargo.toml b/Cargo.toml
index 68a9f707..dbca3d21 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [workspace]
 resolver = "2"
-members = ["clients/rust", "p-memo", "program"]
+members = ["clients/rust", "interface", "p-memo", "program"]
 
 [workspace.metadata.cli]
 solana = "2.3.4"
diff --git a/interface/Cargo.toml b/interface/Cargo.toml
new file mode 100644
index 00000000..7192e59d
--- /dev/null
+++ b/interface/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "spl-memo-interface"
+version = "1.0.0"
+description = "Solana Program Library Memo Interface"
+authors = ["Solana Labs Maintainers <maintainers@solanalabs.com>"]
+repository = "https://github.com/solana-labs/solana-program-library"
+license = "Apache-2.0"
+edition = "2021"
+
+[dependencies]
+solana-instruction = "2.2.1"
+solana-pubkey = "2.2.1"
+
+[lib]
+crate-type = ["lib"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
diff --git a/interface/src/instruction.rs b/interface/src/instruction.rs
new file mode 100644
index 00000000..079bd0ba
--- /dev/null
+++ b/interface/src/instruction.rs
@@ -0,0 +1,37 @@
+use {
+    solana_instruction::{AccountMeta, Instruction},
+    solana_pubkey::Pubkey,
+};
+
+/// Build a memo instruction, possibly signed
+///
+/// Accounts expected by this instruction:
+///
+///   0. `..0+N` `[signer]` Expected signers; if zero provided, instruction will
+///      be processed as a normal, unsigned spl-memo
+pub fn build_memo(program_id: &Pubkey, memo: &[u8], signer_pubkeys: &[&Pubkey]) -> Instruction {
+    Instruction {
+        program_id: *program_id,
+        accounts: signer_pubkeys
+            .iter()
+            .map(|&pubkey| AccountMeta::new_readonly(*pubkey, true))
+            .collect(),
+        data: memo.to_vec(),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_build_memo() {
+        let program_id = Pubkey::new_unique();
+        let signer_pubkey = Pubkey::new_unique();
+        let memo = "🐆".as_bytes();
+        let instruction = build_memo(&program_id, memo, &[&signer_pubkey]);
+        assert_eq!(memo, instruction.data);
+        assert_eq!(instruction.accounts.len(), 1);
+        assert_eq!(instruction.accounts[0].pubkey, signer_pubkey);
+    }
+}
diff --git a/interface/src/lib.rs b/interface/src/lib.rs
new file mode 100644
index 00000000..349116df
--- /dev/null
+++ b/interface/src/lib.rs
@@ -0,0 +1,17 @@
+#![deny(missing_docs)]
+
+//! An interface for programs that accept a string of encoded characters and
+//! verifies that it parses, while verifying and logging signers.
+
+/// Instruction type
+pub mod instruction;
+
+/// Legacy symbols from Memo version 1
+pub mod v1 {
+    solana_pubkey::declare_id!("Memo1UhkJRfHyvLMcVucJwxXeuD728EqVDDwQDxFMNo");
+}
+
+/// Symbols from Memo version 3
+pub mod v3 {
+    solana_pubkey::declare_id!("MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr");
+}
diff --git a/package.json b/package.json
index c7bbfc19..d2967eb6 100644
--- a/package.json
+++ b/package.json
@@ -1,10 +1,15 @@
 {
   "private": true,
   "scripts": {
-    "programs:build": "zx ./scripts/program/build.mjs",
-    "programs:test": "zx ./scripts/program/test.mjs",
-    "programs:format": "zx ./scripts/program/format.mjs",
-    "programs:lint": "zx ./scripts/program/lint.mjs",
+    "interface:test": "zx ./scripts/rust/test.mjs interface",
+    "interface:format": "zx ./scripts/rust/format.mjs interface",
+    "interface:lint": "zx ./scripts/rust/lint.mjs interface",
+    "programs:build": "zx ./scripts/rust/build-sbf.mjs program",
+    "programs:test": "zx ./scripts/rust/test-sbf.mjs program",
+    "programs:format": "zx ./scripts/rust/format.mjs program",
+    "programs:lint": "zx ./scripts/rust/lint.mjs program",
+    "p-memo:build": "zx ./scripts/rust/build-sbf.mjs p-memo",
+    "p-memo:test": "zx ./scripts/rust/test-sbf.mjs p-memo",
     "solana:check": "zx ./scripts/check-solana-version.mjs",
     "solana:link": "zx ./scripts/link-solana-version.mjs",
     "generate": "pnpm generate:clients",
@@ -22,7 +27,7 @@
     "clients:rust:test": "zx ./scripts/client/test-rust.mjs",
     "template:upgrade": "zx ./scripts/upgrade-template.mjs",
     "rust:spellcheck": "cargo spellcheck --code 1",
-    "rust:audit": "zx ./scripts/audit-rust.mjs",
+    "rust:audit": "zx ./scripts/rust/audit.mjs",
     "rust:semver": "cargo semver-checks"
   },
   "devDependencies": {
diff --git a/program/Cargo.toml b/program/Cargo.toml
index aa5f107c..a5cbc8bb 100644
--- a/program/Cargo.toml
+++ b/program/Cargo.toml
@@ -18,6 +18,7 @@ solana-msg = "2.2.1"
 solana-program-entrypoint = "2.3.0"
 solana-program-error = "2.2.2"
 solana-pubkey = "2.2.1"
+spl-memo-interface = { path = "../interface", version = "1.0.0" }
 
 [dev-dependencies]
 solana-program-test = "2.3.6"
diff --git a/program/src/lib.rs b/program/src/lib.rs
index 02df4b69..af1f1b87 100644
--- a/program/src/lib.rs
+++ b/program/src/lib.rs
@@ -12,18 +12,12 @@ pub mod processor;
 pub use {
     solana_account_info, solana_instruction, solana_msg, solana_program_entrypoint,
     solana_program_error, solana_pubkey,
+    spl_memo_interface::{
+        v1,
+        v3::{check_id, id, ID},
+    },
 };
-use {
-    solana_instruction::{AccountMeta, Instruction},
-    solana_pubkey::Pubkey,
-};
-
-/// Legacy symbols from Memo version 1
-pub mod v1 {
-    solana_pubkey::declare_id!("Memo1UhkJRfHyvLMcVucJwxXeuD728EqVDDwQDxFMNo");
-}
-
-solana_pubkey::declare_id!("MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr");
+use {solana_instruction::Instruction, solana_pubkey::Pubkey};
 
 /// Build a memo instruction, possibly signed
 ///
@@ -32,27 +26,5 @@ solana_pubkey::declare_id!("MemoSq4gqABAXKb96qnH8TysNcWxMyWCqXgDLGmfcHr");
 ///   0. `..0+N` `[signer]` Expected signers; if zero provided, instruction will
 ///      be processed as a normal, unsigned spl-memo
 pub fn build_memo(memo: &[u8], signer_pubkeys: &[&Pubkey]) -> Instruction {
-    Instruction {
-        program_id: id(),
-        accounts: signer_pubkeys
-            .iter()
-            .map(|&pubkey| AccountMeta::new_readonly(*pubkey, true))
-            .collect(),
-        data: memo.to_vec(),
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_build_memo() {
-        let signer_pubkey = Pubkey::new_unique();
-        let memo = "🐆".as_bytes();
-        let instruction = build_memo(memo, &[&signer_pubkey]);
-        assert_eq!(memo, instruction.data);
-        assert_eq!(instruction.accounts.len(), 1);
-        assert_eq!(instruction.accounts[0].pubkey, signer_pubkey);
-    }
+    spl_memo_interface::instruction::build_memo(&id(), memo, signer_pubkeys)
 }
diff --git a/scripts/program/build.mjs b/scripts/program/build.mjs
deleted file mode 100644
index 7a079660..00000000
--- a/scripts/program/build.mjs
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/usr/bin/env zx
-import 'zx/globals';
-import {
-  cliArguments,
-  getProgramFolders,
-  workingDirectory,
-} from '../utils.mjs';
-
-// Build the programs.
-for (const folder of getProgramFolders()) {
-  const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
-  await $`cargo-build-sbf --manifest-path ${manifestPath} ${cliArguments()}`;
-}
diff --git a/scripts/program/format.mjs b/scripts/program/format.mjs
deleted file mode 100644
index c73ddd41..00000000
--- a/scripts/program/format.mjs
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/usr/bin/env zx
-import 'zx/globals';
-import {
-  cliArguments,
-  getProgramFolders,
-  getToolchainArgument,
-  partitionArguments,
-  popArgument,
-  workingDirectory,
-} from '../utils.mjs';
-
-// Configure additional arguments here, e.g.:
-// ['--arg1', '--arg2', ...cliArguments()]
-const formatArgs = cliArguments();
-
-const fix = popArgument(formatArgs, '--fix');
-const [cargoArgs, fmtArgs] = partitionArguments(formatArgs, '--');
-const toolchain = getToolchainArgument('format');
-
-// Format the programs.
-for (const folder of getProgramFolders()) {
-  const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
-
-  if (fix) {
-    await $`cargo ${toolchain} fmt --manifest-path ${manifestPath} ${cargoArgs} -- ${fmtArgs}`;
-  } else {
-    await $`cargo ${toolchain} fmt --manifest-path ${manifestPath} ${cargoArgs} -- --check ${fmtArgs}`;
-  }
-}
diff --git a/scripts/program/test.mjs b/scripts/program/test.mjs
deleted file mode 100644
index fe85dc6e..00000000
--- a/scripts/program/test.mjs
+++ /dev/null
@@ -1,20 +0,0 @@
-#!/usr/bin/env zx
-import 'zx/globals';
-import {
-  cliArguments,
-  getProgramFolders,
-  workingDirectory,
-} from '../utils.mjs';
-
-const hasSolfmt = await which('solfmt', { nothrow: true });
-
-// Test the programs.
-for (const folder of getProgramFolders()) {
-  const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
-
-  if (hasSolfmt) {
-    await $`RUST_LOG=error cargo test-sbf --manifest-path ${manifestPath} ${cliArguments()} 2>&1 | solfmt`;
-  } else {
-    await $`RUST_LOG=error cargo test-sbf --manifest-path ${manifestPath} ${cliArguments()}`;
-  }
-}
diff --git a/scripts/audit-rust.mjs b/scripts/rust/audit.mjs
similarity index 100%
rename from scripts/audit-rust.mjs
rename to scripts/rust/audit.mjs
diff --git a/scripts/rust/build-sbf.mjs b/scripts/rust/build-sbf.mjs
new file mode 100644
index 00000000..64a80d34
--- /dev/null
+++ b/scripts/rust/build-sbf.mjs
@@ -0,0 +1,10 @@
+#!/usr/bin/env zx
+import 'zx/globals';
+import {
+  cliArguments,
+  workingDirectory,
+} from '../utils.mjs';
+
+const [folder, ...args] = cliArguments();
+const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
+await $`cargo-build-sbf --manifest-path ${manifestPath} ${args}`;
diff --git a/scripts/rust/format.mjs b/scripts/rust/format.mjs
new file mode 100644
index 00000000..68dc98ca
--- /dev/null
+++ b/scripts/rust/format.mjs
@@ -0,0 +1,23 @@
+#!/usr/bin/env zx
+import 'zx/globals';
+import {
+  cliArguments,
+  getToolchainArgument,
+  partitionArguments,
+  popArgument,
+  workingDirectory,
+} from '../utils.mjs';
+
+const [folder, ...formatArgs] = cliArguments();
+
+const fix = popArgument(formatArgs, '--fix');
+const [cargoArgs, fmtArgs] = partitionArguments(formatArgs, '--');
+const toolchain = getToolchainArgument('format');
+
+const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
+
+if (fix) {
+  await $`cargo ${toolchain} fmt --manifest-path ${manifestPath} ${cargoArgs} -- ${fmtArgs}`;
+} else {
+  await $`cargo ${toolchain} fmt --manifest-path ${manifestPath} ${cargoArgs} -- --check ${fmtArgs}`;
+}
diff --git a/scripts/program/lint.mjs b/scripts/rust/lint.mjs
similarity index 52%
rename from scripts/program/lint.mjs
rename to scripts/rust/lint.mjs
index e4314314..66777eb6 100644
--- a/scripts/program/lint.mjs
+++ b/scripts/rust/lint.mjs
@@ -2,12 +2,13 @@
 import 'zx/globals';
 import {
   cliArguments,
-  getProgramFolders,
   getToolchainArgument,
   popArgument,
   workingDirectory,
 } from '../utils.mjs';
 
+const [folder, ...args] = cliArguments();
+
 // Configure arguments here.
 const lintArgs = [
   '-Zunstable-options',
@@ -16,19 +17,16 @@ const lintArgs = [
   '--',
   '--deny=warnings',
   '--deny=clippy::arithmetic_side_effects',
-  ...cliArguments(),
+  ...args,
 ];
 
 const fix = popArgument(lintArgs, '--fix');
 const toolchain = getToolchainArgument('lint');
 
-// Lint the programs using clippy.
-for (const folder of getProgramFolders()) {
-  const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
+const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
 
-  if (fix) {
-    await $`cargo ${toolchain} clippy --manifest-path ${manifestPath} --fix ${lintArgs}`;
-  } else {
-    await $`cargo ${toolchain} clippy --manifest-path ${manifestPath} ${lintArgs}`;
-  }
+if (fix) {
+  await $`cargo ${toolchain} clippy --manifest-path ${manifestPath} --fix ${lintArgs}`;
+} else {
+  await $`cargo ${toolchain} clippy --manifest-path ${manifestPath} ${lintArgs}`;
 }
diff --git a/scripts/rust/test-sbf.mjs b/scripts/rust/test-sbf.mjs
new file mode 100644
index 00000000..971448c6
--- /dev/null
+++ b/scripts/rust/test-sbf.mjs
@@ -0,0 +1,11 @@
+#!/usr/bin/env zx
+import 'zx/globals';
+import {
+  cliArguments,
+  workingDirectory,
+} from '../utils.mjs';
+
+const [folder, ...args] = cliArguments();
+const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
+
+await $`RUST_LOG=error cargo test-sbf --manifest-path ${manifestPath} ${args}`;
diff --git a/scripts/rust/test.mjs b/scripts/rust/test.mjs
new file mode 100644
index 00000000..5b44fb41
--- /dev/null
+++ b/scripts/rust/test.mjs
@@ -0,0 +1,12 @@
+#!/usr/bin/env zx
+import 'zx/globals';
+import {
+  cliArguments,
+  workingDirectory,
+} from '../utils.mjs';
+
+const [folder, ...args] = cliArguments();
+const sbfOutDir = path.join(workingDirectory, 'target', 'deploy');
+const manifestPath = path.join(workingDirectory, folder, 'Cargo.toml');
+
+await $`RUST_LOG=error SBF_OUT_DIR=${sbfOutDir} cargo test --manifest-path ${manifestPath} ${args}`;