diff --git a/graph-gateway/src/chains/ethereum.rs b/graph-gateway/src/chains/ethereum.rs
index 5ff16ed1..f237d7d8 100644
--- a/graph-gateway/src/chains/ethereum.rs
+++ b/graph-gateway/src/chains/ethereum.rs
@@ -23,7 +23,7 @@ impl super::Client for Client {
     type Config = config::Chain;
 
     fn chain_name(config: &Self::Config) -> &str {
-        &config.name
+        &config.names[0]
     }
 
     fn poll_interval() -> Duration {
@@ -34,7 +34,7 @@ impl super::Client for Client {
         chain: config::Chain,
         notify: mpsc::UnboundedSender<ClientMsg>,
     ) -> mpsc::UnboundedSender<UnresolvedBlock> {
-        let _trace = tracing::info_span!("Ethereum Client Actor", chain = %chain.name).entered();
+        let _trace = tracing::info_span!("ethereum_client", chain = %chain.names[0]).entered();
         let (unresolved_tx, mut unresolved_rx) = mpsc::unbounded_channel();
         let mut client = Self {
             chain,
@@ -66,7 +66,7 @@ impl super::Client for Client {
 impl Client {
     async fn spawn_block_fetch(&mut self, unresolved: Option<UnresolvedBlock>) {
         let client = self.http_client.clone();
-        let chain = self.chain.name.clone();
+        let chain = self.chain.names[0].clone();
         let rpc = self.chain.rpc.clone();
         let notify = self.notify.clone();
         tokio::spawn(async move {
diff --git a/graph-gateway/src/client_query.rs b/graph-gateway/src/client_query.rs
index 4a37e908..8320c438 100644
--- a/graph-gateway/src/client_query.rs
+++ b/graph-gateway/src/client_query.rs
@@ -97,7 +97,7 @@ pub struct Context {
     pub budgeter: &'static Budgeter,
     pub indexer_selection_retry_limit: usize,
     pub l2_gateway: Option<Url>,
-    pub block_caches: &'static HashMap<String, BlockCache>,
+    pub block_caches: &'static HashMap<String, &'static BlockCache>,
     pub network: GraphNetwork,
     pub indexing_statuses: Eventual<Ptr<HashMap<Indexing, IndexingStatus>>>,
     pub attestation_domain: &'static Eip712Domain,
@@ -444,10 +444,9 @@ async fn handle_client_query_inner(
         })
         .collect();
 
-    let block_cache = ctx
+    let block_cache = *ctx
         .block_caches
         .get(&subgraph_chain)
-        .cloned()
         .ok_or_else(|| Error::SubgraphChainNotSupported(subgraph_chain))?;
 
     let block_constraints = block_constraints(&context)
@@ -612,7 +611,7 @@ async fn handle_client_query_inner(
             };
 
             let latest_query_block = pick_latest_query_block(
-                &block_cache,
+                block_cache,
                 latest_block.number.saturating_sub(selection.blocks_behind),
                 blocks_per_minute,
             )
@@ -642,7 +641,7 @@ async fn handle_client_query_inner(
                 &latest_block,
                 &latest_query_block,
                 &utility_params.requirements,
-                &block_cache,
+                block_cache,
                 &selection,
             )
             .await;
@@ -819,8 +818,7 @@ async fn handle_indexer_query_inner(
         }
     }
 
-    // Return early if we aren't expecting an attestation.
-    if !ctx.deployment.manifest.features.is_empty() {
+    if !ctx.deployment.expect_attestation {
         return Ok(response.payload);
     }
 
diff --git a/graph-gateway/src/config.rs b/graph-gateway/src/config.rs
index 2b54767f..73cfb87e 100644
--- a/graph-gateway/src/config.rs
+++ b/graph-gateway/src/config.rs
@@ -19,6 +19,9 @@ pub struct Config {
     /// Respect the payment state of API keys (disable for testnets)
     pub api_key_payment_required: bool,
     pub attestations: AttestationConfig,
+    /// Block oracle subgraph URL
+    #[serde_as(as = "DisplayFromStr")]
+    pub block_oracle_subgraph: Url,
     pub chains: Vec<Chain>,
     /// Ethereum RPC provider, or fixed exchange rate for testing
     pub exchange_rate_provider: ExchangeRateProvider,
@@ -86,7 +89,10 @@ pub struct AttestationConfig {
 #[serde_as]
 #[derive(Clone, Debug, Deserialize)]
 pub struct Chain {
-    pub name: String,
+    /// CAIP-2 ID used to identify chains in the block oracle.
+    pub caip2_id: String,
+    /// The first name is used in logs, the others are aliases also supported in subgraph manifests.
+    pub names: Vec<String>,
     #[serde_as(as = "DisplayFromStr")]
     pub rpc: Url,
 }
diff --git a/graph-gateway/src/lib.rs b/graph-gateway/src/lib.rs
index 5a7162f8..06982a52 100644
--- a/graph-gateway/src/lib.rs
+++ b/graph-gateway/src/lib.rs
@@ -1,7 +1,11 @@
-use std::iter;
+use std::{iter, time::Duration};
 
 use axum::Json;
+use eventuals::{Eventual, EventualExt as _, Ptr};
 use reqwest::header::{self, HeaderMap, HeaderName, HeaderValue};
+use serde::Deserialize;
+use thegraph::client as subgraph_client;
+use tokio::sync::Mutex;
 
 pub mod auth;
 pub mod block_constraints;
@@ -42,3 +46,32 @@ where
     );
     (headers, Json(payload))
 }
+
+pub fn spawn_poller<T>(
+    client: subgraph_client::Client,
+    query: String,
+    label: &'static str,
+    interval: Duration,
+) -> Eventual<Ptr<Vec<T>>>
+where
+    T: for<'de> Deserialize<'de> + Send + 'static,
+    Ptr<Vec<T>>: Send,
+{
+    let (writer, reader) = Eventual::new();
+    let state: &'static Mutex<_> = Box::leak(Box::new(Mutex::new((writer, client))));
+    eventuals::timer(interval)
+        .pipe_async(move |_| {
+            let query = query.clone();
+            async move {
+                let mut guard = state.lock().await;
+                match guard.1.paginated_query::<T>(query).await {
+                    Ok(response) => guard.0.write(Ptr::new(response)),
+                    Err(subgraph_poll_err) => {
+                        tracing::error!(label, %subgraph_poll_err);
+                    }
+                };
+            }
+        })
+        .forever();
+    reader
+}
diff --git a/graph-gateway/src/main.rs b/graph-gateway/src/main.rs
index ebd0aa15..5f652162 100644
--- a/graph-gateway/src/main.rs
+++ b/graph-gateway/src/main.rs
@@ -18,6 +18,7 @@ use axum::{
     routing, Router, Server,
 };
 use eventuals::{Eventual, EventualExt as _, Ptr};
+use graph_gateway::topology::block_oracle_chains;
 use graph_subscriptions::subscription_tier::SubscriptionTiers;
 use prometheus::{self, Encoder as _};
 use secp256k1::SecretKey;
@@ -101,22 +102,29 @@ async fn main() {
         .filter(|_| !config.geoip_blocked_countries.is_empty())
         .map(|db| GeoIP::new(db, config.geoip_blocked_countries).unwrap());
 
-    let block_caches = config
-        .chains
-        .into_iter()
-        .map(|chain| {
-            let network = chain.name.clone();
-            let cache = BlockCache::new::<ethereum::Client>(chain);
-            (network, cache)
-        })
-        .collect::<HashMap<String, BlockCache>>();
-    let block_caches: &'static HashMap<String, BlockCache> = Box::leak(Box::new(block_caches));
-
     let http_client = reqwest::Client::builder()
         .timeout(Duration::from_secs(20))
         .build()
         .unwrap();
 
+    let block_oracle_chains = block_oracle_chains(
+        subgraph_client::Client::new(http_client.clone(), config.block_oracle_subgraph),
+        &config.chains,
+    )
+    .await;
+
+    let block_caches: HashMap<String, &'static BlockCache> = config
+        .chains
+        .into_iter()
+        .flat_map(|chain| {
+            let cache: &'static BlockCache =
+                Box::leak(Box::new(BlockCache::new::<ethereum::Client>(chain.clone())));
+            chain.names.into_iter().map(move |alias| (alias, cache))
+        })
+        .collect();
+    let block_caches: &'static HashMap<String, &'static BlockCache> =
+        Box::leak(Box::new(block_caches));
+
     let grt_per_usd: Eventual<GRT> = match config.exchange_rate_provider {
         ExchangeRateProvider::Fixed(grt_per_usd) => Eventual::from_value(GRT(grt_per_usd)),
         ExchangeRateProvider::Rpc(url) => exchange_rate::grt_per_usd(url).await.unwrap(),
@@ -148,7 +156,8 @@ async fn main() {
         )));
 
     let ipfs = ipfs::Client::new(http_client.clone(), config.ipfs, 50);
-    let network = GraphNetwork::new(network_subgraph_data.subgraphs, ipfs).await;
+    let network =
+        GraphNetwork::new(network_subgraph_data.subgraphs, block_oracle_chains, ipfs).await;
 
     // Indexer blocklist
     // Periodically check the defective POIs list against the network indexers and update the
diff --git a/graph-gateway/src/topology.rs b/graph-gateway/src/topology.rs
index d484a528..5c683011 100644
--- a/graph-gateway/src/topology.rs
+++ b/graph-gateway/src/topology.rs
@@ -1,18 +1,21 @@
-use std::collections::{BTreeSet, HashMap};
+use std::collections::{BTreeSet, HashMap, HashSet};
 use std::sync::Arc;
+use std::time::Duration;
 
 use alloy_primitives::Address;
 use anyhow::anyhow;
 use eventuals::{Eventual, EventualExt, Ptr};
 use futures::future::join_all;
+use indoc::indoc;
 use itertools::Itertools;
 use prelude::GRT;
 use serde::Deserialize;
+use thegraph::client as subgraph_client;
 use thegraph::types::{DeploymentId, SubgraphId};
 use tokio::sync::RwLock;
 use toolshed::url::Url;
 
-use crate::{ipfs, network_subgraph};
+use crate::{config, ipfs, network_subgraph, spawn_poller};
 
 /// Representation of the graph network being used to serve queries
 #[derive(Clone)]
@@ -38,6 +41,7 @@ pub struct Subgraph {
 pub struct Deployment {
     pub id: DeploymentId,
     pub manifest: Arc<Manifest>,
+    pub expect_attestation: bool,
     /// An indexer may have multiple active allocations on a deployment. We collapse them into a single logical
     /// allocation using the largest allocation ID and sum of the allocated tokens.
     pub indexers: Vec<Arc<Indexer>>,
@@ -85,6 +89,7 @@ pub struct Manifest {
 impl GraphNetwork {
     pub async fn new(
         subgraphs: Eventual<Ptr<Vec<network_subgraph::Subgraph>>>,
+        block_oracle_chains: Eventual<Ptr<HashSet<String>>>,
         ipfs: Arc<ipfs::Client>,
     ) -> Self {
         let cache: &'static RwLock<IpfsCache> = Box::leak(Box::new(RwLock::new(IpfsCache {
@@ -94,8 +99,9 @@ impl GraphNetwork {
 
         // Create a lookup table for subgraphs, keyed by their ID.
         // Invalid URL indexers are filtered out. See: 7f2f89aa-24c9-460b-ab1e-fc94697c4f4
-        let subgraphs = subgraphs.map(move |subgraphs| async move {
-            Ptr::new(Self::subgraphs(&subgraphs, cache).await)
+        let subgraphs = subgraphs.map(move |subgraphs| {
+            let block_oracle_chains = block_oracle_chains.clone();
+            async move { Ptr::new(Self::subgraphs(&subgraphs, cache, block_oracle_chains).await) }
         });
 
         // Create a lookup table for deployments, keyed by their ID (which is also their IPFS hash).
@@ -134,19 +140,20 @@ impl GraphNetwork {
     async fn subgraphs(
         subgraphs: &[network_subgraph::Subgraph],
         cache: &'static RwLock<IpfsCache>,
+        block_oracle_chains: Eventual<Ptr<HashSet<String>>>,
     ) -> HashMap<SubgraphId, Subgraph> {
+        let block_oracle_chains: &HashSet<String> =
+            &block_oracle_chains.value_immediate().unwrap_or_default();
         join_all(subgraphs.iter().map(|subgraph| async move {
             let id = subgraph.id;
-            let deployments = join_all(
-                subgraph
-                    .versions
-                    .iter()
-                    .map(|version| Self::deployment(subgraphs, version, cache)),
-            )
-            .await
-            .into_iter()
-            .flatten()
-            .collect();
+            let deployments =
+                join_all(subgraph.versions.iter().map(|version| {
+                    Self::deployment(subgraphs, version, cache, block_oracle_chains)
+                }))
+                .await
+                .into_iter()
+                .flatten()
+                .collect();
             let subgraph = Subgraph {
                 deployments,
                 id,
@@ -163,6 +170,7 @@ impl GraphNetwork {
         subgraphs: &[network_subgraph::Subgraph],
         version: &network_subgraph::SubgraphVersion,
         cache: &'static RwLock<IpfsCache>,
+        block_oracle_chains: &HashSet<String>,
     ) -> Option<Arc<Deployment>> {
         let id = version.subgraph_deployment.id;
         let manifest = IpfsCache::manifest(cache, &version.subgraph_deployment.id).await?;
@@ -215,9 +223,13 @@ impl GraphNetwork {
         let transferred_to_l2 = version.subgraph_deployment.transferred_to_l2
             && version.subgraph_deployment.allocations.is_empty();
 
+        let expect_attestation =
+            manifest.features.is_empty() && block_oracle_chains.contains(&manifest.network);
+
         Some(Arc::new(Deployment {
             id,
             manifest,
+            expect_attestation,
             subgraphs,
             indexers,
             transferred_to_l2,
@@ -299,3 +311,48 @@ impl IpfsCache {
         })
     }
 }
+
+/// Returns the set of CAIP-2 IDs supported by the Block Oracle.
+pub async fn block_oracle_chains(
+    subgraph: subgraph_client::Client,
+    chains: &[config::Chain],
+) -> Eventual<Ptr<HashSet<String>>> {
+    let query = indoc! {"
+        networks(
+            block: $block
+            orderBy: id
+            orderDirection: asc
+            first: $first
+            where: {
+                id_gt: $last
+            }
+        ) {
+            id
+        }
+    "};
+    #[derive(Clone, Deserialize)]
+    struct Network {
+        id: String,
+    }
+    let chains: &'static HashMap<String, HashSet<String>> = Box::leak(Box::new(
+        chains
+            .iter()
+            .map(|c| (c.caip2_id.to_string(), HashSet::from_iter(c.names.clone())))
+            .collect::<HashMap<_, _>>(),
+    ));
+    let reader = spawn_poller::<Network>(
+        subgraph,
+        query.into(),
+        "block_oracle",
+        Duration::from_secs(120),
+    )
+    .map(move |networks| async move {
+        networks
+            .iter()
+            .flat_map(|n| chains.get(&n.id).cloned().unwrap_or_default())
+            .collect::<HashSet<String>>()
+            .into()
+    });
+    reader.value().await.unwrap();
+    reader
+}