diff --git a/go.mod b/go.mod
index 45e0bbe49..dc262e397 100644
--- a/go.mod
+++ b/go.mod
@@ -12,6 +12,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue v1.13.12
 	github.com/aws/aws-sdk-go-v2/service/secretsmanager v1.28.6
 	github.com/consensys/gnark-crypto v0.12.1
+	github.com/emirpasic/gods v1.18.1
 	github.com/ethereum/go-ethereum v1.14.8
 	github.com/fxamacker/cbor/v2 v2.5.0
 	github.com/gin-contrib/logger v0.2.6
diff --git a/go.sum b/go.sum
index 4762b276f..d3b4dde0b 100644
--- a/go.sum
+++ b/go.sum
@@ -165,6 +165,8 @@ github.com/docker/go-connections v0.5.0/go.mod h1:ov60Kzw0kKElRwhNs9UlUHAE/F9Fe6
 github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
 github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
+github.com/emirpasic/gods v1.18.1 h1:FXtiHYKDGKCW2KzwZKx0iC0PQmdlorYgdFG9jPXJ1Bc=
+github.com/emirpasic/gods v1.18.1/go.mod h1:8tpGGwCnJ5H4r6BWwaV6OrWmMoPhUl5jm/FMNAnJvWQ=
 github.com/ethereum/c-kzg-4844 v1.0.0 h1:0X1LBXxaEtYD9xsyj9B9ctQEZIpnvVDeoBx8aHEwTNA=
 github.com/ethereum/c-kzg-4844 v1.0.0/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
 github.com/ethereum/go-ethereum v1.14.8 h1:NgOWvXS+lauK+zFukEvi85UmmsS/OkV0N23UZ1VTIig=
diff --git a/relay/auth/authenticator.go b/relay/auth/authenticator.go
index 2e89c83d1..c45ee4da4 100644
--- a/relay/auth/authenticator.go
+++ b/relay/auth/authenticator.go
@@ -6,6 +6,8 @@ import (
 	"fmt"
 	pb "github.com/Layr-Labs/eigenda/api/grpc/relay"
 	"github.com/Layr-Labs/eigenda/core"
+	"github.com/emirpasic/gods/queues"
+	"github.com/emirpasic/gods/queues/linkedlistqueue"
 	lru "github.com/hashicorp/golang-lru/v2"
 	"sync"
 	"time"
@@ -38,7 +40,7 @@ type requestAuthenticator struct {
 	authenticatedClients map[string]struct{}
 
 	// authenticationTimeouts is a list of authentications that have been performed, along with their expiration times.
-	authenticationTimeouts []*authenticationTimeout
+	authenticationTimeouts queues.Queue
 
 	// authenticationTimeoutDuration is the duration for which an auth is valid.
 	// If this is zero, then auth saving is disabled, and each request will be authenticated independently.
@@ -67,7 +69,7 @@ func NewRequestAuthenticator(
 	authenticator := &requestAuthenticator{
 		ics:                           ics,
 		authenticatedClients:          make(map[string]struct{}),
-		authenticationTimeouts:        make([]*authenticationTimeout, 0),
+		authenticationTimeouts:        linkedlistqueue.New(),
 		authenticationTimeoutDuration: authenticationTimeoutDuration,
 		keyCache:                      keyCache,
 	}
@@ -170,7 +172,7 @@ func (a *requestAuthenticator) saveAuthenticationResult(now time.Time, origin st
 	defer a.savedAuthLock.Unlock()
 
 	a.authenticatedClients[origin] = struct{}{}
-	a.authenticationTimeouts = append(a.authenticationTimeouts,
+	a.authenticationTimeouts.Enqueue(
 		&authenticationTimeout{
 			origin:     origin,
 			expiration: now.Add(a.authenticationTimeoutDuration),
@@ -195,14 +197,13 @@ func (a *requestAuthenticator) isAuthenticationStillValid(now time.Time, address
 // removeOldAuthentications removes any authentications that have expired.
 // This method is not thread safe and should be called with the savedAuthLock held.
 func (a *requestAuthenticator) removeOldAuthentications(now time.Time) {
-	index := 0
-	for ; index < len(a.authenticationTimeouts); index++ {
-		if a.authenticationTimeouts[index].expiration.After(now) {
+	for a.authenticationTimeouts.Size() > 0 {
+		val, _ := a.authenticationTimeouts.Peek()
+		next := val.(*authenticationTimeout)
+		if next.expiration.After(now) {
 			break
 		}
-		delete(a.authenticatedClients, a.authenticationTimeouts[index].origin)
-	}
-	if index > 0 {
-		a.authenticationTimeouts = a.authenticationTimeouts[index:]
+		delete(a.authenticatedClients, next.origin)
+		a.authenticationTimeouts.Dequeue()
 	}
 }
diff --git a/relay/blob_provider.go b/relay/blob_provider.go
index 9b9863bfd..70cc31066 100644
--- a/relay/blob_provider.go
+++ b/relay/blob_provider.go
@@ -20,7 +20,7 @@ type blobProvider struct {
 	blobStore *blobstore.BlobStore
 
 	// blobCache is an LRU cache of blobs.
-	blobCache cache.CachedAccessor[v2.BlobKey, []byte]
+	blobCache cache.CacheAccessor[v2.BlobKey, []byte]
 
 	// fetchTimeout is the maximum time to wait for a blob fetch operation to complete.
 	fetchTimeout time.Duration
@@ -31,7 +31,7 @@ func newBlobProvider(
 	ctx context.Context,
 	logger logging.Logger,
 	blobStore *blobstore.BlobStore,
-	blobCacheSize int,
+	blobCacheSize uint64,
 	maxIOConcurrency int,
 	fetchTimeout time.Duration) (*blobProvider, error) {
 
@@ -42,15 +42,23 @@ func newBlobProvider(
 		fetchTimeout: fetchTimeout,
 	}
 
-	c, err := cache.NewCachedAccessor[v2.BlobKey, []byte](blobCacheSize, maxIOConcurrency, server.fetchBlob)
+	c := cache.NewFIFOCache[v2.BlobKey, []byte](blobCacheSize, computeBlobCacheWeight)
+
+	cacheAccessor, err := cache.NewCacheAccessor[v2.BlobKey, []byte](c, maxIOConcurrency, server.fetchBlob)
 	if err != nil {
 		return nil, fmt.Errorf("error creating blob cache: %w", err)
 	}
-	server.blobCache = c
+	server.blobCache = cacheAccessor
 
 	return server, nil
 }
 
+// computeChunkCacheWeight computes the 'weight' of the blob for the cache. The weight of a blob
+// is equal to its size, in bytes.
+func computeBlobCacheWeight(_ v2.BlobKey, value []byte) uint64 {
+	return uint64(len(value))
+}
+
 // GetBlob retrieves a blob from the blob store.
 func (s *blobProvider) GetBlob(ctx context.Context, blobKey v2.BlobKey) ([]byte, error) {
 	data, err := s.blobCache.Get(ctx, blobKey)
diff --git a/relay/blob_provider_test.go b/relay/blob_provider_test.go
index 9309461c6..22368a5d5 100644
--- a/relay/blob_provider_test.go
+++ b/relay/blob_provider_test.go
@@ -39,7 +39,7 @@ func TestReadWrite(t *testing.T) {
 		context.Background(),
 		logger,
 		blobStore,
-		10,
+		1024*1024*32,
 		32,
 		10*time.Second)
 	require.NoError(t, err)
@@ -76,7 +76,7 @@ func TestNonExistentBlob(t *testing.T) {
 		context.Background(),
 		logger,
 		blobStore,
-		10,
+		1024*1024*32,
 		32,
 		10*time.Second)
 	require.NoError(t, err)
diff --git a/relay/cache/cache.go b/relay/cache/cache.go
new file mode 100644
index 000000000..1d3c7f1a0
--- /dev/null
+++ b/relay/cache/cache.go
@@ -0,0 +1,25 @@
+package cache
+
+// WeightCalculator is a function that calculates the weight of a key-value pair in a Cache.
+// By default, the weight of a key-value pair is 1. Cache capacity is always specified in terms of
+// the weight of the key-value pairs it can hold, rather than the number of key-value pairs.
+type WeightCalculator[K comparable, V any] func(key K, value V) uint64
+
+// Cache is an interface for a generic cache.
+//
+// Unless otherwise noted, Cache implementations are not required to be thread safe.
+type Cache[K comparable, V any] interface {
+	// Get returns the value associated with the key, and a boolean indicating whether the key was found in the cache.
+	Get(key K) (V, bool)
+
+	// Put adds a key-value pair to the cache. After this operation, values may be dropped if the total weight
+	// exceeds the configured maximum weight. Will ignore the new value if it exceeds the maximum weight
+	// of the cache in and of itself.
+	Put(key K, value V)
+
+	// Size returns the number of key-value pairs in the cache.
+	Size() int
+
+	// Weight returns the total weight of the key-value pairs in the cache.
+	Weight() uint64
+}
diff --git a/relay/cache/cached_accessor.go b/relay/cache/cache_accessor.go
similarity index 81%
rename from relay/cache/cached_accessor.go
rename to relay/cache/cache_accessor.go
index d13122908..a6389538b 100644
--- a/relay/cache/cached_accessor.go
+++ b/relay/cache/cache_accessor.go
@@ -2,21 +2,20 @@ package cache
 
 import (
 	"context"
-	lru "github.com/hashicorp/golang-lru/v2"
 	"golang.org/x/sync/semaphore"
 	"sync"
 )
 
-// CachedAccessor is an interface for accessing a resource that is cached. It assumes that cache misses
+// CacheAccessor is an interface for accessing a resource that is cached. It assumes that cache misses
 // are expensive, and prevents multiple concurrent cache misses for the same key.
-type CachedAccessor[K comparable, V any] interface {
+type CacheAccessor[K comparable, V any] interface {
 	// Get returns the value for the given key. If the value is not in the cache, it will be fetched using the Accessor.
 	// If the context is cancelled, the function may abort early. If multiple goroutines request the same key,
 	// cancellation of one request will not affect the others.
 	Get(ctx context.Context, key K) (V, error)
 }
 
-// Accessor is function capable of fetching a value from a resource. Used by CachedAccessor when there is a cache miss.
+// Accessor is function capable of fetching a value from a resource. Used by CacheAccessor when there is a cache miss.
 type Accessor[K comparable, V any] func(key K) (V, error)
 
 // accessResult is a struct that holds the result of an Accessor call.
@@ -29,23 +28,24 @@ type accessResult[V any] struct {
 	err error
 }
 
-var _ CachedAccessor[string, string] = &cachedAccessor[string, string]{}
+var _ CacheAccessor[string, string] = &cacheAccessor[string, string]{}
 
 // Future work: the cache used in this implementation is suboptimal when storing items that have a large
 // variance in size. The current implementation uses a fixed size cache, which requires the cached to be
 // sized to the largest item that will be stored. This cache should be replaced with an implementation
 // whose size can be specified by memory footprint in bytes.
 
-// cachedAccessor is an implementation of CachedAccessor.
-type cachedAccessor[K comparable, V any] struct {
+// cacheAccessor is an implementation of CacheAccessor.
+type cacheAccessor[K comparable, V any] struct {
+
 	// lookupsInProgress has an entry for each key that is currently being looked up via the accessor. The value
 	// is written into the channel when it is eventually fetched. If a key is requested more than once while a
 	// lookup in progress, the second (and following) requests will wait for the result of the first lookup
 	// to be written into the channel.
 	lookupsInProgress map[K]*accessResult[V]
 
-	// cache is the LRU cache used to store values fetched by the accessor.
-	cache *lru.Cache[K, V]
+	// cache is the underlying cache that this wrapper manages.
+	cache Cache[K, V]
 
 	// concurrencyLimiter is a channel used to limit the number of concurrent lookups that can be in progress.
 	concurrencyLimiter chan struct{}
@@ -57,20 +57,15 @@ type cachedAccessor[K comparable, V any] struct {
 	accessor Accessor[K, V]
 }
 
-// NewCachedAccessor creates a new CachedAccessor. The cacheSize parameter specifies the maximum number of items
+// NewCacheAccessor creates a new CacheAccessor. The cacheSize parameter specifies the maximum number of items
 // that can be stored in the cache. The concurrencyLimit parameter specifies the maximum number of concurrent
 // lookups that can be in progress at any given time. If a greater number of lookups are requested, the excess
 // lookups will block until a lookup completes. If concurrencyLimit is zero, then no limits are imposed. The accessor
 // parameter is the function used to fetch values that are not in the cache.
-func NewCachedAccessor[K comparable, V any](
-	cacheSize int,
+func NewCacheAccessor[K comparable, V any](
+	cache Cache[K, V],
 	concurrencyLimit int,
-	accessor Accessor[K, V]) (CachedAccessor[K, V], error) {
-
-	cache, err := lru.New[K, V](cacheSize)
-	if err != nil {
-		return nil, err
-	}
+	accessor Accessor[K, V]) (CacheAccessor[K, V], error) {
 
 	lookupsInProgress := make(map[K]*accessResult[V])
 
@@ -79,7 +74,7 @@ func NewCachedAccessor[K comparable, V any](
 		concurrencyLimiter = make(chan struct{}, concurrencyLimit)
 	}
 
-	return &cachedAccessor[K, V]{
+	return &cacheAccessor[K, V]{
 		cache:              cache,
 		concurrencyLimiter: concurrencyLimiter,
 		accessor:           accessor,
@@ -95,7 +90,7 @@ func newAccessResult[V any]() *accessResult[V] {
 	return result
 }
 
-func (c *cachedAccessor[K, V]) Get(ctx context.Context, key K) (V, error) {
+func (c *cacheAccessor[K, V]) Get(ctx context.Context, key K) (V, error) {
 	c.cacheLock.Lock()
 
 	// first, attempt to get the value from the cache
@@ -126,7 +121,7 @@ func (c *cachedAccessor[K, V]) Get(ctx context.Context, key K) (V, error) {
 // waitForResult waits for the result of a lookup that was initiated by another requester and returns it
 // when it becomes is available. This method will return quickly if the provided context is cancelled.
 // Doing so does not disrupt the other requesters that are also waiting for this result.
-func (c *cachedAccessor[K, V]) waitForResult(ctx context.Context, result *accessResult[V]) (V, error) {
+func (c *cacheAccessor[K, V]) waitForResult(ctx context.Context, result *accessResult[V]) (V, error) {
 	err := result.sem.Acquire(ctx, 1)
 	if err != nil {
 		var zeroValue V
@@ -139,7 +134,7 @@ func (c *cachedAccessor[K, V]) waitForResult(ctx context.Context, result *access
 
 // fetchResult fetches the value for the given key and returns it. If the context is cancelled before the value
 // is fetched, the function will return early. If the fetch is successful, the value will be added to the cache.
-func (c *cachedAccessor[K, V]) fetchResult(ctx context.Context, key K, result *accessResult[V]) (V, error) {
+func (c *cacheAccessor[K, V]) fetchResult(ctx context.Context, key K, result *accessResult[V]) (V, error) {
 
 	// Perform the work in a background goroutine. This allows us to return early if the context is cancelled
 	// without disrupting the fetch operation that other requesters may be waiting for.
@@ -159,7 +154,7 @@ func (c *cachedAccessor[K, V]) fetchResult(ctx context.Context, key K, result *a
 
 		// Update the cache if the fetch was successful.
 		if err == nil {
-			c.cache.Add(key, value)
+			c.cache.Put(key, value)
 		}
 
 		// Provide the result to all other goroutines that may be waiting for it.
diff --git a/relay/cache/cached_accessor_test.go b/relay/cache/cache_accessor_test.go
similarity index 89%
rename from relay/cache/cached_accessor_test.go
rename to relay/cache/cache_accessor_test.go
index 9048e3d88..0f2ac501d 100644
--- a/relay/cache/cached_accessor_test.go
+++ b/relay/cache/cache_accessor_test.go
@@ -32,8 +32,11 @@ func TestRandomOperationsSingleThread(t *testing.T) {
 		return &str, nil
 	}
 	cacheSize := rand.Intn(dataSize) + 1
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	for i := 0; i < dataSize; i++ {
@@ -80,7 +83,11 @@ func TestCacheMisses(t *testing.T) {
 		return &str, nil
 	}
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	// Get the first cacheSize keys. This should fill the cache.
@@ -143,7 +150,11 @@ func ParallelAccessTest(t *testing.T, sleepEnabled bool) {
 	}
 	cacheSize := rand.Intn(dataSize) + 1
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	// Lock the accessor. This will cause all cache misses to block.
@@ -184,7 +195,7 @@ func ParallelAccessTest(t *testing.T, sleepEnabled bool) {
 	require.Equal(t, uint64(1), cacheMissCount.Load())
 
 	// The internal lookupsInProgress map should no longer contain the key.
-	require.Equal(t, 0, len(ca.(*cachedAccessor[int, *string]).lookupsInProgress))
+	require.Equal(t, 0, len(ca.(*cacheAccessor[int, *string]).lookupsInProgress))
 }
 
 func TestParallelAccess(t *testing.T) {
@@ -212,7 +223,11 @@ func TestParallelAccessWithError(t *testing.T) {
 	}
 	cacheSize := 100
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	// Lock the accessor. This will cause all cache misses to block.
@@ -253,7 +268,7 @@ func TestParallelAccessWithError(t *testing.T) {
 	require.Equal(t, count+1, cacheMissCount.Load())
 
 	// The internal lookupsInProgress map should no longer contain the key.
-	require.Equal(t, 0, len(ca.(*cachedAccessor[int, *string]).lookupsInProgress))
+	require.Equal(t, 0, len(ca.(*cacheAccessor[int, *string]).lookupsInProgress))
 }
 
 func TestConcurrencyLimiter(t *testing.T) {
@@ -284,7 +299,11 @@ func TestConcurrencyLimiter(t *testing.T) {
 	}
 
 	cacheSize := 100
-	ca, err := NewCachedAccessor(cacheSize, maxConcurrency, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, maxConcurrency, accessor)
 	require.NoError(t, err)
 
 	wg := sync.WaitGroup{}
@@ -338,7 +357,11 @@ func TestOriginalRequesterTimesOut(t *testing.T) {
 	}
 	cacheSize := rand.Intn(dataSize) + 1
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	// Lock the accessor. This will cause all cache misses to block.
@@ -397,7 +420,7 @@ func TestOriginalRequesterTimesOut(t *testing.T) {
 	require.Equal(t, uint64(1), cacheMissCount.Load())
 
 	// The internal lookupsInProgress map should no longer contain the key.
-	require.Equal(t, 0, len(ca.(*cachedAccessor[int, *string]).lookupsInProgress))
+	require.Equal(t, 0, len(ca.(*cacheAccessor[int, *string]).lookupsInProgress))
 }
 
 func TestSecondaryRequesterTimesOut(t *testing.T) {
@@ -426,7 +449,11 @@ func TestSecondaryRequesterTimesOut(t *testing.T) {
 	}
 	cacheSize := rand.Intn(dataSize) + 1
 
-	ca, err := NewCachedAccessor(cacheSize, 0, accessor)
+	c := NewFIFOCache[int, *string](uint64(cacheSize), func(key int, value *string) uint64 {
+		return 1
+	})
+
+	ca, err := NewCacheAccessor[int, *string](c, 0, accessor)
 	require.NoError(t, err)
 
 	// Lock the accessor. This will cause all cache misses to block.
@@ -489,5 +516,5 @@ func TestSecondaryRequesterTimesOut(t *testing.T) {
 	require.Equal(t, uint64(1), cacheMissCount.Load())
 
 	// The internal lookupsInProgress map should no longer contain the key.
-	require.Equal(t, 0, len(ca.(*cachedAccessor[int, *string]).lookupsInProgress))
+	require.Equal(t, 0, len(ca.(*cacheAccessor[int, *string]).lookupsInProgress))
 }
diff --git a/relay/cache/fifo-cache.go b/relay/cache/fifo-cache.go
new file mode 100644
index 000000000..1c2e7c6ab
--- /dev/null
+++ b/relay/cache/fifo-cache.go
@@ -0,0 +1,73 @@
+package cache
+
+import (
+	"github.com/emirpasic/gods/queues"
+	"github.com/emirpasic/gods/queues/linkedlistqueue"
+)
+
+var _ Cache[string, string] = &FIFOCache[string, string]{}
+
+// FIFOCache is a cache that evicts the least recently added item when the cache is full. Useful for situations
+// where time of addition is a better predictor of future access than time of most recent access.
+type FIFOCache[K comparable, V any] struct {
+	weightCalculator WeightCalculator[K, V]
+
+	currentWeight   uint64
+	maxWeight       uint64
+	data            map[K]V
+	expirationQueue queues.Queue
+}
+
+// NewFIFOCache creates a new FIFOCache.
+func NewFIFOCache[K comparable, V any](maxWeight uint64, calculator WeightCalculator[K, V]) *FIFOCache[K, V] {
+	return &FIFOCache[K, V]{
+		maxWeight:        maxWeight,
+		data:             make(map[K]V),
+		weightCalculator: calculator,
+		expirationQueue:  linkedlistqueue.New(),
+	}
+}
+
+func (f *FIFOCache[K, V]) Get(key K) (V, bool) {
+	val, ok := f.data[key]
+	return val, ok
+}
+
+func (f *FIFOCache[K, V]) Put(key K, value V) {
+	weight := f.weightCalculator(key, value)
+	if weight > f.maxWeight {
+		// this item won't fit in the cache no matter what we evict
+		return
+	}
+
+	old, ok := f.data[key]
+	f.currentWeight += weight
+	f.data[key] = value
+	if ok {
+		oldWeight := f.weightCalculator(key, old)
+		f.currentWeight -= oldWeight
+	} else {
+		f.expirationQueue.Enqueue(key)
+	}
+
+	if f.currentWeight < f.maxWeight {
+		// no need to evict anything
+		return
+	}
+
+	for f.currentWeight > f.maxWeight {
+		val, _ := f.expirationQueue.Dequeue()
+		keyToEvict := val.(K)
+		weightToEvict := f.weightCalculator(keyToEvict, f.data[keyToEvict])
+		delete(f.data, keyToEvict)
+		f.currentWeight -= weightToEvict
+	}
+}
+
+func (f *FIFOCache[K, V]) Size() int {
+	return len(f.data)
+}
+
+func (f *FIFOCache[K, V]) Weight() uint64 {
+	return f.currentWeight
+}
diff --git a/relay/cache/fifo_cache_test.go b/relay/cache/fifo_cache_test.go
new file mode 100644
index 000000000..da4de5ad1
--- /dev/null
+++ b/relay/cache/fifo_cache_test.go
@@ -0,0 +1,138 @@
+package cache
+
+import (
+	tu "github.com/Layr-Labs/eigenda/common/testutils"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/exp/rand"
+	"testing"
+)
+
+func TestExpirationOrder(t *testing.T) {
+	tu.InitializeRandom()
+
+	maxWeight := uint64(10 + rand.Intn(10))
+	c := NewFIFOCache[int, int](maxWeight, func(key int, value int) uint64 {
+		return 1
+	})
+
+	require.Equal(t, uint64(0), c.Weight())
+	require.Equal(t, 0, c.Size())
+
+	expectedValues := make(map[int]int)
+
+	// Fill up the cache. Everything should have weight 1.
+	for i := 1; i <= int(maxWeight); i++ {
+
+		value := rand.Int()
+		expectedValues[i] = value
+
+		// The value shouldn't be present yet
+		v, ok := c.Get(i)
+		require.False(t, ok)
+		require.Equal(t, 0, v)
+
+		c.Put(i, value)
+
+		require.Equal(t, uint64(i), c.Weight())
+		require.Equal(t, i, c.Size())
+	}
+
+	// Verify that all expected values are present.
+	for k, v := range expectedValues {
+		value, ok := c.Get(k)
+		require.True(t, ok)
+		require.Equal(t, v, value)
+	}
+
+	// Push the old values out of the queue one at a time.
+	for i := 1; i <= int(maxWeight); i++ {
+		value := rand.Int()
+		expectedValues[-i] = value
+		delete(expectedValues, i)
+
+		// The value shouldn't be present yet
+		v, ok := c.Get(-i)
+		require.False(t, ok)
+		require.Equal(t, 0, v)
+
+		c.Put(-i, value)
+
+		require.Equal(t, maxWeight, c.Weight())
+		require.Equal(t, int(maxWeight), c.Size())
+
+		// verify that the purged value is specifically not present
+		_, ok = c.Get(i)
+		require.False(t, ok)
+
+		// verify that only the expected values have been purged. Has the added benefit of randomly
+		// reading all the values in the cache, which for a FIFO cache should not influence the order
+		// that we purge values.
+		for kk, vv := range expectedValues {
+			value, ok = c.Get(kk)
+			require.True(t, ok)
+			require.Equal(t, vv, value)
+		}
+	}
+}
+
+func TestWeightedValues(t *testing.T) {
+	tu.InitializeRandom()
+
+	maxWeight := uint64(100 + rand.Intn(100))
+
+	// For this test, weight is simply the key.
+	weightCalculator := func(key int, value int) uint64 {
+		return uint64(key)
+	}
+
+	c := NewFIFOCache[int, int](maxWeight, weightCalculator)
+
+	expectedValues := make(map[int]int)
+
+	require.Equal(t, uint64(0), c.Weight())
+	require.Equal(t, 0, c.Size())
+
+	highestUndeletedKey := 0
+	expectedWeight := uint64(0)
+	for nextKey := 0; nextKey <= int(maxWeight); nextKey++ {
+		value := rand.Int()
+		c.Put(nextKey, value)
+		expectedValues[nextKey] = value
+		expectedWeight += uint64(nextKey)
+
+		// simulate the expected removal
+		for expectedWeight > maxWeight {
+			delete(expectedValues, highestUndeletedKey)
+			expectedWeight -= uint64(highestUndeletedKey)
+			highestUndeletedKey++
+		}
+
+		require.Equal(t, expectedWeight, c.Weight())
+		require.Equal(t, len(expectedValues), c.Size())
+
+		// Update a random existing key. Shouldn't affect the weight or removal order.
+		for k := range expectedValues {
+			value = rand.Int()
+			c.Put(k, value)
+			expectedValues[k] = value
+			break
+		}
+
+		// verify that all expected values are present
+		for k, v := range expectedValues {
+			var ok bool
+			value, ok = c.Get(k)
+			require.True(t, ok)
+			require.Equal(t, v, value)
+		}
+	}
+
+	// Attempting to insert a value that exceeds the max weight should have no effect.
+	c.Put(int(maxWeight)+1, rand.Int())
+
+	for k, v := range expectedValues {
+		value, ok := c.Get(k)
+		require.True(t, ok)
+		require.Equal(t, v, value)
+	}
+}
diff --git a/relay/chunk_provider.go b/relay/chunk_provider.go
index 48ece7c3c..5bc292673 100644
--- a/relay/chunk_provider.go
+++ b/relay/chunk_provider.go
@@ -20,7 +20,7 @@ type chunkProvider struct {
 
 	// metadataCache is an LRU cache of blob metadata. Each relay is authorized to serve data assigned to one or more
 	// relay IDs. Blobs that do not belong to one of the relay IDs assigned to this server will not be in the cache.
-	frameCache cache.CachedAccessor[blobKeyWithMetadata, []*encoding.Frame]
+	frameCache cache.CacheAccessor[blobKeyWithMetadata, []*encoding.Frame]
 
 	// chunkReader is used to read chunks from the chunk store.
 	chunkReader chunkstore.ChunkReader
@@ -47,7 +47,7 @@ func newChunkProvider(
 	ctx context.Context,
 	logger logging.Logger,
 	chunkReader chunkstore.ChunkReader,
-	cacheSize int,
+	cacheSize uint64,
 	maxIOConcurrency int,
 	proofFetchTimeout time.Duration,
 	coefficientFetchTimeout time.Duration) (*chunkProvider, error) {
@@ -60,14 +60,16 @@ func newChunkProvider(
 		coefficientFetchTimeout: coefficientFetchTimeout,
 	}
 
-	c, err := cache.NewCachedAccessor[blobKeyWithMetadata, []*encoding.Frame](
-		cacheSize,
+	c := cache.NewFIFOCache[blobKeyWithMetadata, []*encoding.Frame](cacheSize, computeFramesCacheWeight)
+
+	cacheAccessor, err := cache.NewCacheAccessor[blobKeyWithMetadata, []*encoding.Frame](
+		c,
 		maxIOConcurrency,
 		server.fetchFrames)
 	if err != nil {
 		return nil, err
 	}
-	server.frameCache = c
+	server.frameCache = cacheAccessor
 
 	return server, nil
 }
@@ -75,6 +77,12 @@ func newChunkProvider(
 // frameMap is a map of blob keys to frames.
 type frameMap map[v2.BlobKey][]*encoding.Frame
 
+// computeFramesCacheWeight computes the 'weight' of the frames for the cache. The weight of a list of frames
+// is equal to the size required to store the data, in bytes.
+func computeFramesCacheWeight(key blobKeyWithMetadata, frames []*encoding.Frame) uint64 {
+	return uint64(len(frames)) * uint64(key.metadata.chunkSizeBytes)
+}
+
 // GetFrames retrieves the frames for a blob.
 func (s *chunkProvider) GetFrames(ctx context.Context, mMap metadataMap) (frameMap, error) {
 
diff --git a/relay/chunk_provider_test.go b/relay/chunk_provider_test.go
index 8615ad7d2..06ec215b8 100644
--- a/relay/chunk_provider_test.go
+++ b/relay/chunk_provider_test.go
@@ -49,7 +49,7 @@ func TestFetchingIndividualBlobs(t *testing.T) {
 		context.Background(),
 		logger,
 		chunkReader,
-		10,
+		1024*1024*32,
 		32,
 		10*time.Second,
 		10*time.Second)
@@ -136,7 +136,7 @@ func TestFetchingBatchedBlobs(t *testing.T) {
 		context.Background(),
 		logger,
 		chunkReader,
-		10,
+		1024*1024*32,
 		32,
 		10*time.Second,
 		10*time.Second)
diff --git a/relay/cmd/config.go b/relay/cmd/config.go
index 154c4c2bd..ff1513d17 100644
--- a/relay/cmd/config.go
+++ b/relay/cmd/config.go
@@ -60,9 +60,9 @@ func NewConfig(ctx *cli.Context) (Config, error) {
 			MaxGRPCMessageSize:     ctx.Int(flags.MaxGRPCMessageSizeFlag.Name),
 			MetadataCacheSize:      ctx.Int(flags.MetadataCacheSizeFlag.Name),
 			MetadataMaxConcurrency: ctx.Int(flags.MetadataMaxConcurrencyFlag.Name),
-			BlobCacheSize:          ctx.Int(flags.BlobCacheSizeFlag.Name),
+			BlobCacheBytes:         ctx.Uint64(flags.BlobCacheBytes.Name),
 			BlobMaxConcurrency:     ctx.Int(flags.BlobMaxConcurrencyFlag.Name),
-			ChunkCacheSize:         ctx.Int(flags.ChunkCacheSizeFlag.Name),
+			ChunkCacheSize:         ctx.Uint64(flags.ChunkCacheSizeFlag.Name),
 			ChunkMaxConcurrency:    ctx.Int(flags.ChunkMaxConcurrencyFlag.Name),
 			RateLimits: limiter.Config{
 				MaxGetBlobOpsPerSecond:          ctx.Float64(flags.MaxGetBlobOpsPerSecondFlag.Name),
diff --git a/relay/cmd/flags/flags.go b/relay/cmd/flags/flags.go
index baed1fbcf..0bb24ce2a 100644
--- a/relay/cmd/flags/flags.go
+++ b/relay/cmd/flags/flags.go
@@ -60,12 +60,12 @@ var (
 		EnvVar:   common.PrefixEnvVar(envVarPrefix, "METADATA_MAX_CONCURRENCY"),
 		Value:    32,
 	}
-	BlobCacheSizeFlag = cli.IntFlag{
-		Name:     common.PrefixFlag(FlagPrefix, "blob-cache-size"),
-		Usage:    "Max number of items in the blob cache",
+	BlobCacheBytes = cli.Uint64Flag{
+		Name:     common.PrefixFlag(FlagPrefix, "blob-cache-bytes"),
+		Usage:    "The size of the blob cache, in bytes.",
 		Required: false,
 		EnvVar:   common.PrefixEnvVar(envVarPrefix, "BLOB_CACHE_SIZE"),
-		Value:    32,
+		Value:    1024 * 1024 * 1024,
 	}
 	BlobMaxConcurrencyFlag = cli.IntFlag{
 		Name:     common.PrefixFlag(FlagPrefix, "blob-max-concurrency"),
@@ -74,12 +74,12 @@ var (
 		EnvVar:   common.PrefixEnvVar(envVarPrefix, "BLOB_MAX_CONCURRENCY"),
 		Value:    32,
 	}
-	ChunkCacheSizeFlag = cli.IntFlag{
+	ChunkCacheSizeFlag = cli.Int64Flag{
 		Name:     common.PrefixFlag(FlagPrefix, "chunk-cache-size"),
-		Usage:    "Max number of items in the chunk cache",
+		Usage:    "Size of the chunk cache, in bytes.",
 		Required: false,
 		EnvVar:   common.PrefixEnvVar(envVarPrefix, "CHUNK_CACHE_SIZE"),
-		Value:    32,
+		Value:    4 * 1024 * 1024 * 1024,
 	}
 	ChunkMaxConcurrencyFlag = cli.IntFlag{
 		Name:     common.PrefixFlag(FlagPrefix, "chunk-max-concurrency"),
@@ -297,7 +297,7 @@ var optionalFlags = []cli.Flag{
 	MaxGRPCMessageSizeFlag,
 	MetadataCacheSizeFlag,
 	MetadataMaxConcurrencyFlag,
-	BlobCacheSizeFlag,
+	BlobCacheBytes,
 	BlobMaxConcurrencyFlag,
 	ChunkCacheSizeFlag,
 	ChunkMaxConcurrencyFlag,
diff --git a/relay/metadata_provider.go b/relay/metadata_provider.go
index 8f3f43ed8..e1f188bb9 100644
--- a/relay/metadata_provider.go
+++ b/relay/metadata_provider.go
@@ -36,7 +36,7 @@ type metadataProvider struct {
 
 	// metadataCache is an LRU cache of blob metadata. Blobs that do not belong to one of the relay shards
 	// assigned to this server will not be in the cache.
-	metadataCache cache.CachedAccessor[v2.BlobKey, *blobMetadata]
+	metadataCache cache.CacheAccessor[v2.BlobKey, *blobMetadata]
 
 	// relayIDSet is the set of relay IDs assigned to this relay. This relay will refuse to serve metadata for blobs
 	// that are not assigned to one of these IDs.
@@ -74,8 +74,13 @@ func newMetadataProvider(
 	}
 	server.blobParamsMap.Store(blobParamsMap)
 
-	metadataCache, err := cache.NewCachedAccessor[v2.BlobKey, *blobMetadata](
-		metadataCacheSize,
+	c := cache.NewFIFOCache[v2.BlobKey, *blobMetadata](uint64(metadataCacheSize),
+		func(key v2.BlobKey, value *blobMetadata) uint64 {
+			return uint64(1)
+		})
+
+	metadataCache, err := cache.NewCacheAccessor[v2.BlobKey, *blobMetadata](
+		c,
 		maxIOConcurrency,
 		server.fetchMetadata)
 	if err != nil {
diff --git a/relay/server.go b/relay/server.go
index 540b46b0b..eb00709e9 100644
--- a/relay/server.go
+++ b/relay/server.go
@@ -78,14 +78,14 @@ type Config struct {
 	// goroutines.
 	MetadataMaxConcurrency int
 
-	// BlobCacheSize is the maximum number of items in the blob cache.
-	BlobCacheSize int
+	// BlobCacheBytes is the maximum size of the blob cache, in bytes.
+	BlobCacheBytes uint64
 
 	// BlobMaxConcurrency puts a limit on the maximum number of concurrent blob fetches actively running on goroutines.
 	BlobMaxConcurrency int
 
-	// ChunkCacheSize is the maximum number of items in the chunk cache.
-	ChunkCacheSize int
+	// ChunkCacheSize is the maximum size of the chunk cache, in bytes.
+	ChunkCacheSize uint64
 
 	// ChunkMaxConcurrency is the size of the work pool for fetching chunks. Note that this does not
 	// impact concurrency utilized by the s3 client to upload/download fragmented files.
@@ -153,7 +153,7 @@ func NewServer(
 		ctx,
 		logger,
 		blobStore,
-		config.BlobCacheSize,
+		config.BlobCacheBytes,
 		config.BlobMaxConcurrency,
 		config.Timeouts.InternalGetBlobTimeout)
 	if err != nil {
diff --git a/relay/server_test.go b/relay/server_test.go
index 3e16c624c..58b889371 100644
--- a/relay/server_test.go
+++ b/relay/server_test.go
@@ -25,9 +25,9 @@ func defaultConfig() *Config {
 		MaxGRPCMessageSize:         1024 * 1024 * 300,
 		MetadataCacheSize:          1024 * 1024,
 		MetadataMaxConcurrency:     32,
-		BlobCacheSize:              32,
+		BlobCacheBytes:             1024 * 1024,
 		BlobMaxConcurrency:         32,
-		ChunkCacheSize:             32,
+		ChunkCacheSize:             1024 * 1024,
 		ChunkMaxConcurrency:        32,
 		MaxKeysPerGetChunksRequest: 1024,
 		RateLimits: limiter.Config{