diff --git a/.gitignore b/.gitignore
index 7672b7d..a9717f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,5 +18,6 @@ debian-packaging/*
 export-go-db/export-go-db
 import-rust-db/target
 /target
+reaction-plugin/target
 /local
 .ccls-cache
diff --git a/reaction-plugin/Cargo.lock b/reaction-plugin/Cargo.lock
new file mode 100644
index 0000000..a4701f3
--- /dev/null
+++ b/reaction-plugin/Cargo.lock
@@ -0,0 +1,319 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "cfg-if"
+version = "1.0.3"
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+checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9"
+
+[[package]]
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+checksum = "877a4ace8713b0bcf2a4e7eec82529c029f1d0619886d18145fea96c3ffe5c0f"
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
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+ "hashbrown",
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+ "cfg-if",
+ "windows-link",
+]
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+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
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+[[package]]
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+ "ppv-lite86",
+ "rand_core",
+]
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+[[package]]
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+dependencies = [
+ "getrandom",
+]
+
+[[package]]
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+version = "0.1.0"
+dependencies = [
+ "stabby",
+]
+
+[[package]]
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+]
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+[[package]]
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+[[package]]
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+ "syn 2.0.106",
+]
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+dependencies = [
+ "libloading",
+ "rustversion",
+ "stabby-abi",
+]
+
+[[package]]
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+dependencies = [
+ "rustc_version",
+ "rustversion",
+ "sha2-const-stable",
+ "stabby-macros",
+]
+
+[[package]]
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+checksum = "a768b1e51e4dbfa4fa52ae5c01241c0a41e2938fdffbb84add0c8238092f9091"
+dependencies = [
+ "proc-macro-crate",
+ "proc-macro2",
+ "quote",
+ "rand",
+ "syn 1.0.109",
+]
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+ "quote",
+ "unicode-ident",
+]
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+ "unicode-ident",
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+ "toml_datetime",
+ "toml_parser",
+ "winnow",
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+dependencies = [
+ "memchr",
+]
+
+[[package]]
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+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
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+checksum = "88d2b8d9c68ad2b9e4340d7832716a4d21a22a1154777ad56ea55c51a9cf3831"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.106",
+]
diff --git a/reaction-plugin/Cargo.toml b/reaction-plugin/Cargo.toml
new file mode 100644
index 0000000..c015504
--- /dev/null
+++ b/reaction-plugin/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "reaction-plugin"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+stabby = { version = "72.1.1", features = ["libloading"] }
diff --git a/reaction-plugin/src/lib.rs b/reaction-plugin/src/lib.rs
new file mode 100644
index 0000000..93ec74d
--- /dev/null
+++ b/reaction-plugin/src/lib.rs
@@ -0,0 +1,84 @@
+/// This crate permits to define a stable ABI between reaction's core and plugins.
+///
+/// It uses [`stabby`], that rewrites essential std types as stable repr("C") types,
+/// and permits to check a lof of safeness related issues at compile time and at runtime, when
+/// loading a library.
+///
+/// To implement a plugin, one has to provide an implementation of [`PluginInfo`], that provides
+/// the entrypoint for a plugin.
+/// It permits to define 0 to n (stream, filter, action) custom types.
+use stabby::{
+    boxed::Box, future::DynFuture, option::Option, result::Result, string::String, vec::Vec,
+};
+
+mod value;
+pub use value::Value;
+
+/// This is the only trait that **must** be implemented by a plugin.
+/// It provides lists of stream, filter and action types implemented by a dynamic plugin.
+#[stabby::stabby(checked)]
+pub trait PluginInfo {
+    /// Return all stream types that should be made available to reaction users
+    extern "C" fn stream_impls(&self) -> Vec<String>;
+    /// Return one instance of a given type.
+    extern "C" fn stream_impl(
+        &mut self,
+        stream_name: String,
+        stream_type: String,
+        config: Value,
+    ) -> Result<BoxedStreamImpl, PluginError>;
+
+    /// Return all filter types that should be made available to reaction users
+    extern "C" fn filter_impls(&self) -> Vec<String>;
+    /// Return one instance of a given type.
+    extern "C" fn filter_impl(
+        &mut self,
+        stream_name: String,
+        filter_name: String,
+        filter_type: String,
+        config: Value,
+    ) -> Result<BoxedFilterImpl, PluginError>;
+
+    /// Return all action types that should be made available to reaction users
+    extern "C" fn action_impls(&self) -> Vec<String>;
+    /// Return one instance of a given type.
+    extern "C" fn action_impl(
+        &mut self,
+        stream_name: String,
+        filter_name: String,
+        action_name: String,
+        action_type: String,
+        config: Value,
+    ) -> Result<BoxedActionImpl, PluginError>;
+
+    /// Notify the plugin that setup is finished, permitting a last occasion to report an error
+    /// (For example if a stream wants a companion action but it hasn't been initialized)
+    extern "C" fn finish_setup(&mut self) -> Result<(), String>;
+}
+
+pub enum PluginError {
+    InexistantType,
+    InitialisationError(String),
+}
+
+type BoxedStreamImpl = stabby::dynptr!(Box<dyn StreamImpl>);
+type BoxedFilterImpl = stabby::dynptr!(Box<dyn FilterImpl>);
+type BoxedActionImpl = stabby::dynptr!(Box<dyn ActionImpl>);
+
+#[stabby::stabby(checked)]
+pub trait StreamImpl {
+    extern "C" fn next<'a>(&'a mut self) -> DynFuture<'a, Result<Option<Vec<u8>>, String>>;
+    extern "C" fn close<'a>(&'a mut self) -> DynFuture<'a, Result<(), String>>;
+}
+
+#[stabby::stabby(checked)]
+pub trait FilterImpl {
+    extern "C" fn matches(&mut self, line: String) -> bool;
+    extern "C" fn close(&mut self) -> Result<(), String>;
+}
+
+#[stabby::stabby(checked)]
+pub trait ActionImpl {
+    extern "C" fn next<'a>(&'a mut self) -> DynFuture<'a, Result<Option<Vec<u8>>, String>>;
+    extern "C" fn close<'a>(&'a mut self) -> DynFuture<'a, Result<(), String>>;
+}
diff --git a/reaction-plugin/src/value.rs b/reaction-plugin/src/value.rs
new file mode 100644
index 0000000..34322b0
--- /dev/null
+++ b/reaction-plugin/src/value.rs
@@ -0,0 +1,14 @@
+use stabby::{string::String, tuple::Tuple2, vec::Vec};
+
+/// Represents a configuration value.
+/// This is not meant as an efficient type, but as a very flexible one.
+#[stabby::stabby]
+pub enum Value {
+    Null,
+    Bool(bool),
+    Integer(i64),
+    Float(f64),
+    String(String),
+    Array(Vec<Value>),
+    Object(Vec<Tuple2<String, Value>>),
+}