diff --git a/README.md b/README.md
index ee0ae1f9..ca8aafb9 100644
--- a/README.md
+++ b/README.md
@@ -99,6 +99,13 @@ Copy the ULID key (or UUID key) out of the above command, and put it into the fo
 web3_proxy_cli --db-url ... change_user_tier_by_key "$RPC_ULID_KEY_FROM_PREV_COMMAND" "Unlimited"
 ```
 
+### Health compass
+
+Health check 3 servers and error if the first one doesn't match the others.
+
+```
+web3_proxy_cli https://eth.llamarpc.com/ https://rpc.ankr.com/eth https://cloudflare-eth.com
+```
 
 ## Database entities
 
diff --git a/web3_proxy/src/bin/web3_proxy_cli/cost_calculator.rs b/web3_proxy/src/bin/web3_proxy_cli/cost_calculator.rs
new file mode 100644
index 00000000..f2e6af2c
--- /dev/null
+++ b/web3_proxy/src/bin/web3_proxy_cli/cost_calculator.rs
@@ -0,0 +1,238 @@
+use std::str::FromStr;
+
+// select all requests for a timeline. sum bandwidth and request count. give `cost / byte` and `cost / request`.
+use anyhow::Context;
+use argh::FromArgs;
+use entities::{rpc_accounting, rpc_key, user};
+use ethers::types::Address;
+use log::{debug, info};
+use migration::{
+    sea_orm::{
+        self,
+        prelude::{DateTimeUtc, Decimal},
+        ColumnTrait, DatabaseConnection, EntityTrait, FromQueryResult, QueryFilter, QuerySelect,
+    },
+    Condition,
+};
+
+#[derive(Debug, PartialEq, Eq)]
+pub enum TimeFrame {
+    Day,
+    Month,
+}
+
+impl TimeFrame {
+    pub fn as_seconds(&self) -> u64 {
+        match self {
+            Self::Day => 86_400,
+            Self::Month => 2_628_000,
+        }
+    }
+}
+
+impl FromStr for TimeFrame {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> anyhow::Result<Self> {
+        match s.to_lowercase().as_ref() {
+            "day" => Ok(Self::Day),
+            "month" => Ok(Self::Month),
+            _ => Err(anyhow::anyhow!("Invalid string. Should be day or month.")),
+        }
+    }
+}
+
+/// calculate costs
+#[derive(FromArgs, PartialEq, Debug, Eq)]
+#[argh(subcommand, name = "cost_calculator")]
+pub struct CostCalculatorCommand {
+    /// dollar cost of running web3-proxy
+    #[argh(positional)]
+    cost: Decimal,
+
+    #[argh(positional)]
+    cost_timeframe: TimeFrame,
+
+    /// the address of the user to check. If none, check all.
+    /// TODO: allow checking a single key
+    #[argh(option)]
+    address: Option<String>,
+
+    /// the chain id to check. If none, check all.
+    #[argh(option)]
+    chain_id: Option<u64>,
+    // TODO: start and end dates?
+}
+
+impl CostCalculatorCommand {
+    pub async fn main(self, db_conn: &DatabaseConnection) -> anyhow::Result<()> {
+        #[derive(Debug, FromQueryResult)]
+        struct SelectResult {
+            pub total_frontend_requests: Decimal,
+            pub total_backend_retries: Decimal,
+            pub total_cache_misses: Decimal,
+            pub total_cache_hits: Decimal,
+            pub total_response_bytes: Decimal,
+            pub total_error_responses: Decimal,
+            pub total_response_millis: Decimal,
+            pub first_period_datetime: DateTimeUtc,
+            pub last_period_datetime: DateTimeUtc,
+        }
+
+        let q = rpc_accounting::Entity::find()
+            .select_only()
+            .column_as(
+                rpc_accounting::Column::FrontendRequests.sum(),
+                "total_frontend_requests",
+            )
+            .column_as(
+                rpc_accounting::Column::BackendRequests.sum(),
+                "total_backend_retries",
+            )
+            .column_as(
+                rpc_accounting::Column::CacheMisses.sum(),
+                "total_cache_misses",
+            )
+            .column_as(rpc_accounting::Column::CacheHits.sum(), "total_cache_hits")
+            .column_as(
+                rpc_accounting::Column::SumResponseBytes.sum(),
+                "total_response_bytes",
+            )
+            .column_as(
+                // TODO: can we sum bools like this?
+                rpc_accounting::Column::ErrorResponse.sum(),
+                "total_error_responses",
+            )
+            .column_as(
+                rpc_accounting::Column::SumResponseMillis.sum(),
+                "total_response_millis",
+            )
+            .column_as(
+                rpc_accounting::Column::PeriodDatetime.min(),
+                "first_period_datetime",
+            )
+            .column_as(
+                rpc_accounting::Column::PeriodDatetime.max(),
+                "last_period_datetime",
+            );
+
+        let mut condition = Condition::all();
+
+        // TODO: do this with add_option? try operator is harder to use then
+        if let Some(address) = self.address {
+            let address: Vec<u8> = address.parse::<Address>()?.to_fixed_bytes().into();
+
+            // TODO: find_with_related
+            let u = user::Entity::find()
+                .filter(user::Column::Address.eq(address))
+                .one(db_conn)
+                .await?
+                .context("no user found")?;
+
+            // TODO: select_only
+            let u_keys = rpc_key::Entity::find()
+                .filter(rpc_key::Column::UserId.eq(u.id))
+                .all(db_conn)
+                .await?;
+
+            if u_keys.is_empty() {
+                return Err(anyhow::anyhow!("no user keys"));
+            }
+
+            let u_key_ids: Vec<_> = u_keys.iter().map(|x| x.id).collect();
+
+            condition = condition.add(rpc_accounting::Column::RpcKeyId.is_in(u_key_ids));
+        }
+
+        let q = q.filter(condition);
+
+        // TODO: make this work without into_json. i think we need to make a struct
+        let query_response = q
+            .into_model::<SelectResult>()
+            .one(db_conn)
+            .await?
+            .context("no query result")?;
+
+        info!("query_response: {:#?}", query_response);
+
+        // todo!("calculate cost/frontend request, cost/response_byte, calculate with a discount for cache hits");
+
+        let cost_seconds: Decimal = self.cost_timeframe.as_seconds().into();
+
+        debug!("cost_seconds: {}", cost_seconds);
+
+        let query_seconds: Decimal = query_response
+            .last_period_datetime
+            .signed_duration_since(query_response.first_period_datetime)
+            .num_seconds()
+            .into();
+        info!("query seconds: {}", query_seconds);
+
+        let x = costs(
+            query_response.total_frontend_requests,
+            query_seconds,
+            cost_seconds,
+            self.cost,
+        );
+        info!("${} = frontend request cost", x);
+
+        let x = costs(
+            query_response.total_frontend_requests - query_response.total_error_responses,
+            query_seconds,
+            cost_seconds,
+            self.cost,
+        );
+        info!("${} = frontend request cost excluding errors", x);
+
+        let x = costs(
+            query_response.total_frontend_requests
+                - query_response.total_error_responses
+                - query_response.total_cache_hits,
+            query_seconds,
+            cost_seconds,
+            self.cost,
+        );
+        info!(
+            "${} = frontend request cost excluding errors and cache hits",
+            x
+        );
+
+        let x = costs(
+            query_response.total_frontend_requests
+                - query_response.total_error_responses
+                - (query_response.total_cache_hits / Decimal::from(2)),
+            query_seconds,
+            cost_seconds,
+            self.cost,
+        );
+        info!(
+            "${} = frontend request cost excluding errors and half cache hits",
+            x
+        );
+
+        let x = costs(
+            query_response.total_response_bytes,
+            query_seconds,
+            cost_seconds,
+            self.cost,
+        );
+        info!("${} = response byte cost", x);
+
+        // TODO: another script that takes these numbers and applies to a single user?
+
+        Ok(())
+    }
+}
+
+fn costs(
+    query_total: Decimal,
+    query_seconds: Decimal,
+    cost_seconds: Decimal,
+    cost: Decimal,
+) -> Decimal {
+    let requests_per_second = query_total / query_seconds;
+    let requests_per_cost_timeframe = requests_per_second * cost_seconds;
+    let request_cost_per_query = cost / requests_per_cost_timeframe;
+
+    request_cost_per_query.round_dp(9)
+}
diff --git a/web3_proxy/src/bin/web3_proxy_cli/delete_user.rs b/web3_proxy/src/bin/web3_proxy_cli/delete_user.rs
new file mode 100644
index 00000000..f157b5f0
--- /dev/null
+++ b/web3_proxy/src/bin/web3_proxy_cli/delete_user.rs
@@ -0,0 +1 @@
+//! delete user. don't delete rpc_accounting because we need that for our own accounting. have a "deleted" user that takes them over
diff --git a/web3_proxy/src/bin/web3_proxy_cli/list_recent_users.rs b/web3_proxy/src/bin/web3_proxy_cli/list_recent_users.rs
new file mode 100644
index 00000000..cb0a7020
--- /dev/null
+++ b/web3_proxy/src/bin/web3_proxy_cli/list_recent_users.rs
@@ -0,0 +1 @@
+//! List users that have recently made a request
diff --git a/web3_proxy/src/bin/web3_proxy_cli/main.rs b/web3_proxy/src/bin/web3_proxy_cli/main.rs
index a3a89dea..07696398 100644
--- a/web3_proxy/src/bin/web3_proxy_cli/main.rs
+++ b/web3_proxy/src/bin/web3_proxy_cli/main.rs
@@ -3,6 +3,7 @@ mod change_user_address_by_key;
 mod change_user_tier;
 mod change_user_tier_by_key;
 mod check_config;
+mod cost_calculator;
 mod create_user;
 mod drop_migration_lock;
 mod health_compass;
@@ -43,6 +44,7 @@ enum SubCommand {
     ChangeUserAddressByKey(change_user_address_by_key::ChangeUserAddressByKeyCommand),
     ChangeUserTier(change_user_tier::ChangeUserTierCommand),
     ChangeUserTierByKey(change_user_tier_by_key::ChangeUserTierByKeyCommand),
+    CostCalculatorCommand(cost_calculator::CostCalculatorCommand),
     CheckConfig(check_config::CheckConfigSubCommand),
     CreateUser(create_user::CreateUserSubCommand),
     DropMigrationLock(drop_migration_lock::DropMigrationLockSubCommand),
@@ -110,6 +112,11 @@ async fn main() -> anyhow::Result<()> {
 
             x.main(&db_conn).await
         }
+        SubCommand::CostCalculatorCommand(x) => {
+            let db_conn = get_db(cli_config.db_url, 1, 1).await?;
+
+            x.main(&db_conn).await
+        }
         SubCommand::DropMigrationLock(x) => {
             // very intentionally, do NOT run migrations here
             let db_conn = get_db(cli_config.db_url, 1, 1).await?;
diff --git a/web3_proxy/src/bin/web3_proxy_cli/stat_age.rs b/web3_proxy/src/bin/web3_proxy_cli/stat_age.rs
new file mode 100644
index 00000000..7f5e9757
--- /dev/null
+++ b/web3_proxy/src/bin/web3_proxy_cli/stat_age.rs
@@ -0,0 +1 @@
+//! show how old the most recently saved stat is
diff --git a/web3_proxy/src/user_queries.rs b/web3_proxy/src/user_queries.rs
index f7bc896b..03c6e660 100644
--- a/web3_proxy/src/user_queries.rs
+++ b/web3_proxy/src/user_queries.rs
@@ -240,6 +240,7 @@ pub async fn query_user_stats<'a>(
             "total_response_millis",
         );
 
+    // TODO: make this and q mutable and clean up the code below. no need for more `let q`
     let condition = Condition::all();
 
     let q = if let StatResponse::Detailed = stat_response_type {