diff --git a/.circleci/config.yml b/.circleci/config.yml
index b35f4b5c62..b382caed2d 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1,4 +1,38 @@
-version: 2
+version: 2.1
+commands:
+  setup-sccache:
+    steps:
+      - run:
+          name: Setup sccache
+          command: |
+            # This configures Rust to use sccache.
+            echo 'export "RUSTC_WRAPPER"="/usr/local/cargo/bin/sccache"' >> $BASH_ENV
+            # This is the maximum space sccache cache will use on disk.
+            echo 'export "SCCACHE_CACHE_SIZE"="2G"' >> $BASH_ENV
+            /usr/local/cargo/bin/sccache --version
+  restore-sccache-cache:
+    steps:
+      - restore_cache:
+          name: Restore sccache cache
+          key: sccache-cache-stable-{{ arch }}-{{ .Environment.CIRCLE_JOB }}
+      - run:
+          name: Show cache size
+          command: /usr/local/cargo/bin/sccache -s
+  save-sccache-cache:
+    steps:
+      - run:
+          name: Show cache size
+          command: /usr/local/cargo/bin/sccache -s
+      - save_cache:
+          name: Save sccache cache
+          # We use {{ epoch }} to always upload a fresh cache:
+          # Of course, restore_cache will not find this exact key,
+          # but it will fall back to the closest key (aka the most recent).
+          # See https://discuss.circleci.com/t/add-mechanism-to-update-existing-cache-key/9014/13
+          key: sccache-cache-stable-{{ arch }}-{{ .Environment.CIRCLE_JOB }}-{{ epoch }}
+          paths:
+            - "/usr/local/cargo"
+            - "~/.cache/sccache"
 jobs:
   lint:
     docker:
@@ -70,19 +104,15 @@ jobs:
     environment:
       - VERBOSE: "1"
       - RUSTFLAGS: -D warnings
-      - RUSTC_WRAPPER: /usr/local/cargo/bin/sccache
     steps:
       - checkout
-      - run:
-          name: Store rust version in an environment var for cache key
-          command: rustc --version > rust.version
-      - restore_cache:
-          keys:
-            - v7-release-cache-{{ checksum "./rust.version" }}-{{ checksum "./Cargo.lock" }}
+      - setup-sccache
+      - restore-sccache-cache
       - run:
           name: Build ci-runtime
           command: cargo build --locked --release --features ci-runtime
           no_output_timeout: 30m
+      - save-sccache-cache
       - run:
           name: Create assets directory for releases
           command: mkdir ./assets
@@ -296,6 +326,42 @@ jobs:
           key: v7-coverage-cache-{{ checksum "./rust.version" }}-{{ checksum "./Cargo.lock" }}
           paths:
             - "/usr/local/cargo"
+  rust-integration-test:
+    docker:
+      - image: polymeshassociation/rust:debian-nightly-2022-11-02
+    resource_class: medium+
+    environment:
+      - VERBOSE: "1"
+      - RUSTFLAGS: -D warnings
+    steps:
+      - checkout
+      - setup-sccache
+      - restore-sccache-cache
+      - attach_workspace:
+          at: ./target/release
+      - run:
+          name: run Polymesh ci-runtime dev chain node for integration tests
+          command: >-
+            ./target/release/ci-runtime-polymesh --bob --chain dev
+              --no-prometheus --no-telemetry --tmp
+              --wasm-execution compiled
+              --pool-limit 100000
+          background: true
+      - run:
+          name: Build nonce server and tests.
+          command: cargo build --bins --tests
+          working_directory: ./integration
+      - run:
+          name: Run background nonce server.
+          command: cargo run --locked
+          working_directory: ./integration
+          background: true
+      - run:
+          name: Run polymesh-api integration tests.
+          command: cargo test --locked
+          working_directory: ./integration
+          no_output_timeout: 30m
+      - save-sccache-cache
   integration-test:
     docker:
       - image: node:16-bullseye
@@ -532,6 +598,9 @@ workflows:
       - build-arm64
       - benchmark-build
       - coverage
+      - rust-integration-test:
+          requires:
+            - build-ci
       - integration-test:
           requires:
             - build-ci
diff --git a/Cargo.toml b/Cargo.toml
index ccda7a6cd5..3d4d287ab0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -159,6 +159,7 @@ members = [
 ]
 exclude = [
     "contracts",
+    "integration"
 ]
 
 [dependencies]
diff --git a/integration/Cargo.lock b/integration/Cargo.lock
new file mode 100644
index 0000000000..8e9e91036e
--- /dev/null
+++ b/integration/Cargo.lock
@@ -0,0 +1,4196 @@
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+
+serde = { version = "1.0.171", features = ["derive"] }
+
+# For simple-nonce server
+actix-web = { version = "4", optional = true }
+ureq = "2"
diff --git a/integration/src/account.rs b/integration/src/account.rs
new file mode 100644
index 0000000000..240920ea83
--- /dev/null
+++ b/integration/src/account.rs
@@ -0,0 +1,89 @@
+use std::sync::Arc;
+
+use sp_core::Pair;
+use sp_keyring::{ed25519, sr25519};
+use sp_runtime::MultiSignature;
+
+use polymesh_api::client::{AccountId, PairSigner, Result, Signer};
+
+use crate::User;
+
+/// AccountSigner is wrapper for signing keys (sr25519, ed25519, etc...).
+#[derive(Clone)]
+pub struct AccountSigner {
+    signer: Arc<dyn Signer + Send + Sync>,
+    account: AccountId,
+}
+
+impl AccountSigner {
+    pub fn new<P: Pair>(pair: P) -> Self
+    where
+        MultiSignature: From<<P as Pair>::Signature>,
+        AccountId: From<<P as Pair>::Public>,
+    {
+        let signer = PairSigner::new(pair);
+        let account = signer.account();
+        Self {
+            signer: Arc::new(signer),
+            account,
+        }
+    }
+
+    pub fn alice() -> Self {
+        Self::new(sr25519::Keyring::Alice.pair())
+    }
+
+    pub fn bob() -> Self {
+        Self::new(sr25519::Keyring::Bob.pair())
+    }
+
+    /// Generate signing key pair from string `s`.
+    pub fn from_string(s: &str) -> Result<Self> {
+        Ok(Self::new(sr25519::sr25519::Pair::from_string(s, None)?))
+    }
+}
+
+impl From<AccountSigner> for User {
+    fn from(signer: AccountSigner) -> User {
+        User { signer, did: None }
+    }
+}
+
+impl From<sr25519::Keyring> for AccountSigner {
+    fn from(key: sr25519::Keyring) -> Self {
+        Self::new(key.pair())
+    }
+}
+
+impl From<ed25519::Keyring> for AccountSigner {
+    fn from(key: ed25519::Keyring) -> Self {
+        Self::new(key.pair())
+    }
+}
+
+#[async_trait::async_trait]
+impl Signer for AccountSigner {
+    fn account(&self) -> AccountId {
+        self.account.clone()
+    }
+
+    fn nonce(&self) -> Option<u32> {
+        let account = self.account.to_hex();
+        ureq::get(&format!(
+            "http://127.0.0.1:8080/account/{}/get_nonce",
+            account
+        ))
+        .call()
+        .expect("get_nonce request")
+        .into_string()
+        .expect("response as string")
+        .parse::<u32>()
+        .ok()
+    }
+
+    fn set_nonce(&mut self, _nonce: u32) {}
+
+    async fn sign(&self, msg: &[u8]) -> polymesh_api::client::Result<MultiSignature> {
+        Ok(self.signer.sign(msg).await?)
+    }
+}
diff --git a/integration/src/bin/simple-nonce-server.rs b/integration/src/bin/simple-nonce-server.rs
new file mode 100644
index 0000000000..0eca50b2c9
--- /dev/null
+++ b/integration/src/bin/simple-nonce-server.rs
@@ -0,0 +1,114 @@
+use std::collections::HashMap;
+use std::sync::Mutex;
+
+use thiserror::Error;
+
+use actix_web::{
+    error,
+    http::{header::ContentType, StatusCode},
+    HttpResponse,
+};
+use actix_web::{get, web, App, HttpServer};
+
+use polymesh_api::client::{AccountId, ChainApi};
+use polymesh_api::Api;
+
+use integration::*;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Polymesh API error: {0}")]
+    PolymeshApiError(polymesh_api::client::Error),
+}
+
+impl From<polymesh_api::client::Error> for Error {
+    fn from(e: polymesh_api::client::Error) -> Self {
+        Self::PolymeshApiError(e)
+    }
+}
+
+impl error::ResponseError for Error {
+    fn error_response(&self) -> HttpResponse {
+        HttpResponse::build(self.status_code())
+            .insert_header(ContentType::html())
+            .body(self.to_string())
+    }
+
+    fn status_code(&self) -> StatusCode {
+        match *self {
+            Error::PolymeshApiError(_) => StatusCode::BAD_GATEWAY,
+        }
+    }
+}
+
+type Result<T, E = Error> = std::result::Result<T, E>;
+
+struct Backend {
+    client: Api,
+    accounts: HashMap<AccountId, u32>,
+}
+
+impl Backend {
+    async fn new() -> Result<Self> {
+        Ok(Self {
+            client: client_api().await?,
+            accounts: Default::default(),
+        })
+    }
+
+    async fn get_nonce(&mut self, account: AccountId) -> Result<u32> {
+        use std::collections::hash_map::Entry;
+        match self.accounts.entry(account) {
+            Entry::Occupied(mut entry) => {
+                let nonce = entry.get_mut();
+                let last = *nonce;
+                *nonce += 1;
+                return Ok(last);
+            }
+            Entry::Vacant(entry) => {
+                let nonce = self.client.get_nonce(account).await?;
+                entry.insert(nonce + 1);
+                Ok(nonce)
+            }
+        }
+    }
+}
+
+struct AppState {
+    backend: Mutex<Backend>,
+}
+
+impl AppState {
+    async fn new() -> Result<Self> {
+        Ok(Self {
+            backend: Mutex::new(Backend::new().await?),
+        })
+    }
+}
+
+#[get("/account/0x{id}/get_nonce")]
+async fn account_get_nonce(
+    data: web::Data<AppState>,
+    path: web::Path<AccountId>,
+) -> Result<String> {
+    let account_id = path.into_inner();
+    let mut backend = data.backend.lock().unwrap();
+
+    let nonce = backend.get_nonce(account_id).await?;
+
+    Ok(format!("{nonce}"))
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    let state = web::Data::new(AppState::new().await.expect("app backend"));
+
+    HttpServer::new(move || {
+        App::new()
+            .app_data(state.clone())
+            .service(account_get_nonce)
+    })
+    .bind(("127.0.0.1", 8080))?
+    .run()
+    .await
+}
diff --git a/integration/src/lib.rs b/integration/src/lib.rs
new file mode 100644
index 0000000000..656d08d02a
--- /dev/null
+++ b/integration/src/lib.rs
@@ -0,0 +1,238 @@
+use std::collections::HashMap;
+
+use polymesh_api::client::{Result, Signer};
+use polymesh_api_client_extras::*;
+pub use polymesh_api::{
+    client::{AccountId, IdentityId},
+    polymesh::types::{
+        polymesh_primitives::secondary_key::{KeyRecord, Permissions, SecondaryKey},
+        runtime::{events::*, RuntimeEvent},
+    },
+    Api,
+};
+
+mod account;
+pub use account::*;
+
+pub async fn client_api() -> Result<Api> {
+    // TODO: use env to get URL.
+    Ok(Api::new("ws://localhost:9944").await?)
+}
+
+#[derive(Clone)]
+pub struct User {
+    pub signer: AccountSigner,
+    pub did: Option<IdentityId>,
+}
+
+#[async_trait::async_trait]
+impl Signer for User {
+    fn account(&self) -> AccountId {
+        self.signer.account()
+    }
+
+    fn nonce(&self) -> Option<u32> {
+        self.signer.nonce()
+    }
+
+    fn set_nonce(&mut self, nonce: u32) {
+        self.signer.set_nonce(nonce)
+    }
+
+    async fn sign(&self, msg: &[u8]) -> polymesh_api::client::Result<sp_runtime::MultiSignature> {
+        Ok(self.signer.sign(msg).await?)
+    }
+}
+
+impl User {
+    pub fn new(signer: AccountSigner) -> Self {
+        Self { signer, did: None }
+    }
+
+    pub fn account(&self) -> AccountId {
+        self.signer.account()
+    }
+}
+
+pub const ONE_POLYX: u128 = 1_000_000;
+
+pub struct PolymeshTester {
+    pub api: Api,
+    seed: String,
+    init_polyx: u128,
+    cdd: AccountSigner,
+    users: HashMap<String, User>,
+}
+
+impl PolymeshTester {
+    pub async fn new() -> Result<Self> {
+        let api = client_api().await?;
+        // Generate a seed based on current timestamp.
+        // We use a 'seed' to allow running tests in parallel.
+        let ts = std::time::SystemTime::now()
+            .duration_since(std::time::UNIX_EPOCH)
+            .expect("now later then epoch")
+            .as_nanos();
+        Ok(Self {
+            api,
+            init_polyx: 10_000 * ONE_POLYX,
+            seed: format!("{}", ts),
+            cdd: AccountSigner::alice(),
+            users: Default::default(),
+        })
+    }
+
+    /// Set how much POLYX to fund each user.
+    pub fn set_init_polyx(&mut self, val: u128) {
+        self.init_polyx = val * ONE_POLYX;
+    }
+
+    fn set_user_did(&mut self, name: &str, did: IdentityId) {
+        if let Some(user) = self.users.get_mut(name) {
+            user.did = Some(did);
+        }
+    }
+
+    fn get_user(&mut self, name: &str) -> Result<User> {
+        use std::collections::hash_map::Entry;
+        match self.users.entry(name.to_string()) {
+            Entry::Occupied(entry) => Ok(entry.get().clone()),
+            Entry::Vacant(entry) => {
+                let signer =
+                    AccountSigner::from_string(&format!("//{}_{}", self.seed, entry.key()))?;
+                let user = User::new(signer);
+                Ok(entry.insert(user).clone())
+            }
+        }
+    }
+
+    /// Get the user if they exist, or create a new one.  Make sure the user
+    /// has an identity.
+    pub async fn user(&mut self, name: &str) -> Result<User> {
+        let mut user = self.get_user(name)?;
+        if user.did.is_none() {
+            let did = self.register_and_fund(user.account()).await?;
+            user.did = Some(did);
+            self.set_user_did(name, did);
+        }
+        Ok(user)
+    }
+
+    async fn load_dids(&mut self, users: &mut [User]) -> Result<()> {
+        for user in users {
+            // Skip users that have an identity.
+            if user.did.is_some() {
+                continue;
+            }
+            // Try getting the user's identity from the chain.
+            user.did = self.get_did(user.account()).await?;
+        }
+        Ok(())
+    }
+
+    /// Get the users if they exist, or create them.  Make sure the users
+    /// have identities.
+    pub async fn users(&mut self, names: &[&str]) -> Result<Vec<User>> {
+        let mut users = Vec::with_capacity(names.len());
+        for name in names {
+            // Get or create user.
+            users.push(self.get_user(name)?);
+        }
+        self.load_dids(users.as_mut_slice()).await?;
+        // Calls for registering users and funding them.
+        let mut calls = Vec::new();
+        // Add calls to register users missing identities.
+        let mut need_dids = Vec::new();
+        for (idx, user) in users.iter().enumerate() {
+            if user.did.is_some() {
+                continue;
+            }
+            need_dids.push(idx);
+            // User needs an identity.
+            calls.push(
+                self.api
+                    .call()
+                    .identity()
+                    .cdd_register_did_with_cdd(user.account(), vec![], None)?
+                    .into(),
+            );
+        }
+        // Add calls to fund the users.
+        for user in &users {
+            // Transfer some funds to the user.
+            calls.push(
+                self.api
+                    .call()
+                    .balances()
+                    .transfer(user.account().into(), self.init_polyx)?
+                    .into(),
+            );
+        }
+        // Execute batch.
+        let mut res = self
+            .api
+            .call()
+            .utility()
+            .batch(calls)?
+            .execute(&mut self.cdd)
+            .await?;
+        // Get new identities from batch events.
+        let ids = get_created_ids(&mut res).await?;
+        for idx in need_dids {
+            let name = names[idx];
+            match &ids[idx] {
+                CreatedIds::IdentityCreated(did) => {
+                    users[idx].did = Some(*did);
+                    self.set_user_did(name, *did);
+                }
+                id => {
+                    panic!("Unexpected id: {id:?}");
+                }
+            }
+        }
+        Ok(users)
+    }
+
+    pub async fn key_records(&self, account: AccountId) -> Result<Option<KeyRecord<AccountId>>> {
+        self.api.query().identity().key_records(account).await
+    }
+
+    pub async fn get_did(&self, account: AccountId) -> Result<Option<IdentityId>> {
+        let did = match self.key_records(account).await? {
+            Some(KeyRecord::PrimaryKey(did)) => Some(did),
+            Some(KeyRecord::SecondaryKey(did, _)) => Some(did),
+            _ => None,
+        };
+        Ok(did)
+    }
+
+    pub async fn register_and_fund(&mut self, account: AccountId) -> Result<IdentityId> {
+        let did = match self.get_did(account).await? {
+            Some(did) => did,
+            None => {
+                // `account` is not linked to an identity.
+                // Create a new identity with `account` as the primary key.
+                let mut res = self
+                    .api
+                    .call()
+                    .utility()
+                    .batch(vec![
+                        self.api
+                            .call()
+                            .identity()
+                            .cdd_register_did_with_cdd(account, vec![], None)?
+                            .into(),
+                        self.api
+                            .call()
+                            .balances()
+                            .transfer(account.into(), self.init_polyx)?
+                            .into(),
+                    ])?
+                    .execute(&mut self.cdd)
+                    .await?;
+                get_identity_id(&mut res).await?.unwrap()
+            }
+        };
+        Ok(did)
+    }
+}
diff --git a/integration/tests/create_venue.rs b/integration/tests/create_venue.rs
new file mode 100644
index 0000000000..acfea4ed0e
--- /dev/null
+++ b/integration/tests/create_venue.rs
@@ -0,0 +1,29 @@
+use anyhow::Result;
+
+use integration::*;
+use polymesh_api::types::polymesh_primitives::settlement::{VenueDetails, VenueType};
+use polymesh_api_client_extras::*;
+
+#[tokio::test]
+async fn create_venue() -> Result<()> {
+    let mut tester = PolymeshTester::new().await?;
+    let mut users = tester.users(&["CreateVenueUser1"]).await?;
+
+    let mut res1 = tester
+        .api
+        .call()
+        .settlement()
+        .create_venue(VenueDetails(b"Test1".to_vec()), vec![], VenueType::Other)?
+        .submit_and_watch(&mut users[0])
+        .await?;
+    let mut res2 = tester
+        .api
+        .call()
+        .settlement()
+        .create_venue(VenueDetails(b"Test2".to_vec()), vec![], VenueType::Other)?
+        .submit_and_watch(&mut users[0])
+        .await?;
+    println!("venue1 = {:?}", get_venue_id(&mut res1).await?);
+    println!("venue2 = {:?}", get_venue_id(&mut res2).await?);
+    Ok(())
+}
diff --git a/integration/tests/simple_transfer.rs b/integration/tests/simple_transfer.rs
new file mode 100644
index 0000000000..3e8771966b
--- /dev/null
+++ b/integration/tests/simple_transfer.rs
@@ -0,0 +1,20 @@
+use anyhow::Result;
+
+use integration::*;
+
+#[tokio::test]
+async fn simple_polyx_transfer() -> Result<()> {
+    let mut tester = PolymeshTester::new().await?;
+    let mut users = tester.users(&["User1", "User2"]).await?;
+
+    let mut res = tester
+        .api
+        .call()
+        .balances()
+        .transfer(users[1].account().into(), 13 * ONE_POLYX)?
+        .execute(&mut users[0])
+        .await?;
+    let events = res.events().await?;
+    println!("call1 events = {:#?}", events);
+    Ok(())
+}