diff --git a/cmd/main.go b/cmd/main.go
index f8f5c7a..a2a3927 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -9,17 +9,15 @@ import (
 	"time"
 
 	"github.com/dappnode/validator-tracker/internal/adapters/beacon"
+	"github.com/dappnode/validator-tracker/internal/adapters/brain"
 	"github.com/dappnode/validator-tracker/internal/adapters/dappmanager"
 	"github.com/dappnode/validator-tracker/internal/adapters/notifier"
-	"github.com/dappnode/validator-tracker/internal/adapters/web3signer"
 	"github.com/dappnode/validator-tracker/internal/application/domain"
 	"github.com/dappnode/validator-tracker/internal/application/services"
 	"github.com/dappnode/validator-tracker/internal/config"
 	"github.com/dappnode/validator-tracker/internal/logger"
 )
 
-//TODO: Implement dev mode with commands example
-
 func main() {
 	// Load config
 	cfg := config.LoadConfig()
@@ -35,7 +33,7 @@ func main() {
 		cfg.Network,
 		cfg.SignerDnpName,
 	)
-	web3Signer := web3signer.NewWeb3SignerAdapter(cfg.Web3SignerEndpoint)
+	brain := brain.NewBrainAdapter(cfg.BrainUrl)
 	// TODO: do not err
 	beacon, err := beacon.NewBeaconAdapter(cfg.BeaconEndpoint)
 	if err != nil {
@@ -50,7 +48,7 @@ func main() {
 	// Start the duties checker service in a goroutine
 	dutiesChecker := &services.DutiesChecker{
 		Beacon:          beacon,
-		Signer:          web3Signer,
+		Brain:           brain,
 		Notifier:        notifier,
 		Dappmanager:     dappmanager,
 		PollInterval:    1 * time.Minute,
diff --git a/internal/adapters/brain/brain.go b/internal/adapters/brain/brain.go
new file mode 100644
index 0000000..e2facbe
--- /dev/null
+++ b/internal/adapters/brain/brain.go
@@ -0,0 +1,82 @@
+package brain
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/dappnode/validator-tracker/internal/application/ports"
+)
+
+// This adapter is required to be used due to the web3signer blocklisting any host requesting its API that is not whitelisted.
+// See https://github.com/dappnode/DAppNodePackage-web3signer-generic/blob/e50e36e6fe213f274cceefc2a089552fa6042be4/services/web3signer/entrypoint.sh#L41C28-L41C42
+
+type BrainAdapter struct {
+	BaseURL string
+	client  *http.Client
+}
+
+type brainValidatorsResponse map[string][]string
+
+func NewBrainAdapter(baseURL string) ports.BrainAdapter {
+	// Always append :5000 if not present
+	u, err := url.Parse(baseURL)
+	if err == nil && u.Port() == "" {
+		if u.Scheme == "" {
+			baseURL = fmt.Sprintf("%s:5000", baseURL)
+		} else {
+			u.Host = fmt.Sprintf("%s:5000", u.Host)
+			baseURL = u.String()
+		}
+	} else if err != nil && !strings.HasSuffix(baseURL, ":5000") {
+		baseURL = fmt.Sprintf("%s:5000", baseURL)
+	}
+	return &BrainAdapter{
+		BaseURL: baseURL,
+		client:  &http.Client{Timeout: 3 * time.Second},
+	}
+}
+
+// GetValidatorPubkeys queries /api/v0/brain/validators?format=pubkey and merges all arrays in the response
+func (b *BrainAdapter) GetValidatorPubkeys() ([]string, error) {
+	endpoint := fmt.Sprintf("%s/api/v0/brain/validators", b.BaseURL)
+
+	u, err := url.Parse(endpoint)
+	if err != nil {
+		return nil, fmt.Errorf("invalid brain endpoint: %w", err)
+	}
+	q := u.Query()
+	q.Set("format", "pubkey")
+	u.RawQuery = q.Encode()
+
+	req, err := http.NewRequest("GET", u.String(), nil)
+	if err != nil {
+		return nil, fmt.Errorf("creating brain request: %w", err)
+	}
+
+	resp, err := b.client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("error sending brain request: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("unexpected brain status %d: %s", resp.StatusCode, string(body))
+	}
+
+	var result brainValidatorsResponse
+	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("error decoding brain response: %w", err)
+	}
+
+	var pubkeys []string
+	for _, arr := range result {
+		pubkeys = append(pubkeys, arr...)
+	}
+	return pubkeys, nil
+}
diff --git a/internal/adapters/web3signer/web3signer.go b/internal/adapters/web3signer/web3signer.go
deleted file mode 100644
index 1e300ad..0000000
--- a/internal/adapters/web3signer/web3signer.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package web3signer
-
-import (
-	"encoding/json"
-	"fmt"
-	"io"
-	"net/http"
-	"time"
-
-	"github.com/dappnode/validator-tracker/internal/application/ports"
-)
-
-// Web3SignerAdapter implements ports.Web3SignerAdapter
-type Web3SignerAdapter struct {
-	Endpoint string
-}
-
-// KeystoreResponse models the expected JSON from /eth/v1/keystores
-type KeystoreResponse struct {
-	Data []struct {
-		ValidatingPubkey string `json:"validating_pubkey"`
-	} `json:"data"`
-}
-
-func NewWeb3SignerAdapter(endpoint string) ports.Web3SignerAdapter {
-	return &Web3SignerAdapter{Endpoint: endpoint}
-}
-
-func (w *Web3SignerAdapter) GetValidatorPubkeys() ([]string, error) {
-	url := fmt.Sprintf("%s/eth/v1/keystores", w.Endpoint)
-	client := &http.Client{Timeout: 30 * time.Second}
-
-	req, err := http.NewRequest("GET", url, nil)
-	if err != nil {
-		return nil, fmt.Errorf("creating Web3Signer request: %w", err)
-	}
-
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("error sending Web3Signer request: %w", err)
-	}
-	defer resp.Body.Close()
-
-	if resp.StatusCode != http.StatusOK {
-		body, _ := io.ReadAll(resp.Body)
-		return nil, fmt.Errorf("unexpected Web3Signer status %d: %s", resp.StatusCode, string(body))
-	}
-
-	var keystoreResp KeystoreResponse
-	if err := json.NewDecoder(resp.Body).Decode(&keystoreResp); err != nil {
-		return nil, fmt.Errorf("error decoding Web3Signer response: %w", err)
-	}
-
-	pubkeys := make([]string, 0, len(keystoreResp.Data))
-	for _, item := range keystoreResp.Data {
-		pubkeys = append(pubkeys, item.ValidatingPubkey)
-	}
-	return pubkeys, nil
-}
diff --git a/internal/application/ports/brain.go b/internal/application/ports/brain.go
new file mode 100644
index 0000000..374a7a3
--- /dev/null
+++ b/internal/application/ports/brain.go
@@ -0,0 +1,6 @@
+package ports
+
+// BrainAdapter exposes the same method as Web3SignerAdapter for validator pubkeys
+type BrainAdapter interface {
+	GetValidatorPubkeys() ([]string, error)
+}
diff --git a/internal/application/ports/web3signer.go b/internal/application/ports/web3signer.go
deleted file mode 100644
index dfa1822..0000000
--- a/internal/application/ports/web3signer.go
+++ /dev/null
@@ -1,5 +0,0 @@
-package ports
-
-type Web3SignerAdapter interface {
-	GetValidatorPubkeys() ([]string, error)
-}
diff --git a/internal/application/services/dutieschecker_service.go b/internal/application/services/dutieschecker_service.go
index d236067..e403f9b 100644
--- a/internal/application/services/dutieschecker_service.go
+++ b/internal/application/services/dutieschecker_service.go
@@ -11,7 +11,7 @@ import (
 
 type DutiesChecker struct {
 	Beacon      ports.BeaconChainAdapter
-	Signer      ports.Web3SignerAdapter
+	Brain       ports.BrainAdapter
 	Notifier    ports.NotifierPort
 	Dappmanager ports.DappManagerPort
 
@@ -59,9 +59,9 @@ func (a *DutiesChecker) performChecks(ctx context.Context, justifiedEpoch domain
 		logger.Warn("Error fetching notifications enabled, notification will not be sent: %v", err)
 	}
 
-	pubkeys, err := a.Signer.GetValidatorPubkeys()
+	pubkeys, err := a.Brain.GetValidatorPubkeys()
 	if err != nil {
-		logger.Error("Error fetching pubkeys from web3signer: %v", err)
+		logger.Error("Error fetching pubkeys from brain: %v", err)
 		return err
 	}
 
diff --git a/internal/config/config_loader.go b/internal/config/config_loader.go
index ae7c395..880f7f9 100644
--- a/internal/config/config_loader.go
+++ b/internal/config/config_loader.go
@@ -30,7 +30,7 @@ func LoadConfig() Config {
 	web3SignerEndpoint := fmt.Sprintf("http://web3signer.%s.dncore.dappnode:9000", network)
 	dappmanagerEndpoint := "http://dappmanager.dappnode"
 	notifierEndpoint := "http://notifier.dappnode:8080"
-	brainEndpoint := fmt.Sprintf("http://brain.web3signer-%s.dappnode:5000", network)
+	brainEndpoint := fmt.Sprintf("http://brain.web3signer-%s.dappnode", network)
 
 	// Allow override via environment variables
 	if envBeacon := os.Getenv("BEACON_ENDPOINT"); envBeacon != "" {
@@ -58,7 +58,7 @@ func LoadConfig() Config {
 	var dnpName string
 	if network == "mainnet" {
 		dnpName = "web3signer.dnp.dappnode.eth"
-		brainEndpoint = "http://brain.web3signer.dnp.dappnode.eth:8080"
+		brainEndpoint = "http://brain.web3signer.dappnode"
 	} else {
 		dnpName = fmt.Sprintf("web3signer-%s.dnp.dappnode.eth", network)
 	}