diff --git a/pkg/detectors/mercadopago/mercadopago.go b/pkg/detectors/mercadopago/mercadopago.go
new file mode 100644
index 000000000000..f67090f4e6dc
--- /dev/null
+++ b/pkg/detectors/mercadopago/mercadopago.go
@@ -0,0 +1,104 @@
+package mercadopago
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	regexp "github.com/wasilibs/go-re2"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detectorspb"
+)
+
+type Scanner struct {
+	client *http.Client
+}
+
+const verifyURL = "https://api.mercadopago.com/v1/payments/search?sort=date_created&criteria=desc&range=date_created&begin_date=NOW-1DAYS&end_date=NOW"
+
+var (
+	// Ensure the Scanner satisfies the interface at compile time.
+	_ detectors.Detector = (*Scanner)(nil)
+
+	defaultClient = common.SaneHttpClient()
+
+	// MercadoPago access token format: APP_USR-{16digits}-{6digits}-{32hex}__LA_LD__-{digits}
+	keyPat = regexp.MustCompile(`\b(APP_USR-\d{16}-\d{6}-[a-f0-9]{32}__[A-Z]{2}_[A-Z]{2}__-\d+)\b`)
+)
+
+// Keywords are used for efficiently pre-filtering chunks.
+// Use identifiers in the secret preferably, or the provider name.
+func (s Scanner) Keywords() []string {
+	return []string{"APP_USR-"}
+}
+
+func (s Scanner) getClient() *http.Client {
+	if s.client != nil {
+		return s.client
+	}
+	return defaultClient
+}
+
+// FromData will find and optionally verify MercadoPago secrets in a given set of bytes.
+func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
+	dataStr := string(data)
+
+	matches := keyPat.FindAllStringSubmatch(dataStr, -1)
+
+	for _, match := range matches {
+		resMatch := strings.TrimSpace(match[1])
+
+		s1 := detectors.Result{
+			DetectorType: detectorspb.DetectorType_MercadoPago,
+			Raw:          []byte(resMatch),
+		}
+
+		if verify {
+			client := s.getClient()
+			isVerified, verificationErr := verifyMercadoPago(ctx, client, resMatch)
+			s1.Verified = isVerified
+			s1.SetVerificationError(verificationErr, resMatch)
+		}
+
+		results = append(results, s1)
+	}
+
+	return results, nil
+}
+
+func verifyMercadoPago(ctx context.Context, client *http.Client, token string) (bool, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, verifyURL, nil)
+	if err != nil {
+		return false, err
+	}
+	req.Header.Add("Authorization", "Bearer "+token)
+	res, err := client.Do(req)
+	if err != nil {
+		return false, err
+	}
+	defer func() {
+		_, _ = io.Copy(io.Discard, res.Body)
+		res.Body.Close()
+	}()
+
+	switch res.StatusCode {
+	case http.StatusOK:
+		return true, nil
+	case http.StatusUnauthorized, http.StatusForbidden:
+		return false, nil
+	default:
+		return false, fmt.Errorf("unexpected HTTP response status %d", res.StatusCode)
+	}
+}
+
+func (s Scanner) Type() detectorspb.DetectorType {
+	return detectorspb.DetectorType_MercadoPago
+}
+
+func (s Scanner) Description() string {
+	return "MercadoPago is a leading payment processing platform in Latin America. MercadoPago access tokens can be used to process payments, view transaction history, and manage merchant accounts."
+}
diff --git a/pkg/detectors/mercadopago/mercadopago_test.go b/pkg/detectors/mercadopago/mercadopago_test.go
new file mode 100644
index 000000000000..81d0a857f299
--- /dev/null
+++ b/pkg/detectors/mercadopago/mercadopago_test.go
@@ -0,0 +1,83 @@
+package mercadopago
+
+import (
+	"context"
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	"github.com/stretchr/testify/require"
+
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/engine/ahocorasick"
+)
+
+func TestMercadoPago_Pattern(t *testing.T) {
+	d := Scanner{}
+	ahoCorasickCore := ahocorasick.NewAhoCorasickCore([]detectors.Detector{d})
+
+	tests := []struct {
+		name  string
+		input string
+		want  []string
+	}{
+		{
+			name:  "valid pattern - access token",
+			input: "mercadopago_token = APP_USR-1234567890123456-010122-a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6__LA_LD__-987654321",
+			want:  []string{"APP_USR-1234567890123456-010122-a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6__LA_LD__-987654321"},
+		},
+		{
+			name:  "valid pattern - in env file",
+			input: "MERCADO_PAGO_ACCESS_TOKEN=APP_USR-6329847201583746-031522-f0e1d2c3b4a5968778695a4b3c2d1e0f__LA_LD__-123456789",
+			want:  []string{"APP_USR-6329847201583746-031522-f0e1d2c3b4a5968778695a4b3c2d1e0f__LA_LD__-123456789"},
+		},
+		{
+			name:  "invalid pattern - public key format",
+			input: "APP_USR-12345678-1234-1234-1234-123456789abc",
+			want:  nil,
+		},
+		{
+			name:  "invalid pattern - no prefix",
+			input: "some_random_token_value_that_does_not_match",
+			want:  nil,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			matchedDetectors := ahoCorasickCore.FindDetectorMatches([]byte(test.input))
+			if len(matchedDetectors) == 0 {
+				if len(test.want) == 0 {
+					return
+				}
+				t.Errorf("test %q failed: expected keywords %v to be found in the input", test.name, d.Keywords())
+				return
+			}
+
+			results, err := d.FromData(context.Background(), false, []byte(test.input))
+			require.NoError(t, err)
+
+			if len(results) != len(test.want) {
+				t.Errorf("mismatch in result count: expected %d, got %d", len(test.want), len(results))
+				return
+			}
+
+			actual := make(map[string]struct{}, len(results))
+			for _, r := range results {
+				if len(r.RawV2) > 0 {
+					actual[string(r.RawV2)] = struct{}{}
+				} else {
+					actual[string(r.Raw)] = struct{}{}
+				}
+			}
+
+			expected := make(map[string]struct{}, len(test.want))
+			for _, v := range test.want {
+				expected[v] = struct{}{}
+			}
+
+			if diff := cmp.Diff(expected, actual); diff != "" {
+				t.Errorf("%s diff: (-want +got)\n%s", test.name, diff)
+			}
+		})
+	}
+}
diff --git a/pkg/engine/defaults/defaults.go b/pkg/engine/defaults/defaults.go
index fee8a40f19e9..2ff555525c48 100644
--- a/pkg/engine/defaults/defaults.go
+++ b/pkg/engine/defaults/defaults.go
@@ -464,6 +464,7 @@ import (
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/mediastack"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/meistertask"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/meraki"
+	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/mercadopago"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/mesibo"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/messagebird"
 	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors/metaapi"
@@ -1344,6 +1345,7 @@ func buildDetectorList() []detectors.Detector {
 		&mediastack.Scanner{},
 		&meistertask.Scanner{},
 		&meraki.Scanner{},
+		&mercadopago.Scanner{},
 		&mesibo.Scanner{},
 		&messagebird.Scanner{},
 		&metaapi.Scanner{},
diff --git a/proto/detectors.proto b/proto/detectors.proto
index e85ef9ac92bf..a592a99e7ead 100644
--- a/proto/detectors.proto
+++ b/proto/detectors.proto
@@ -1052,6 +1052,7 @@ enum DetectorType {
   OpenAIAdmin = 1040;
   GoogleGeminiAPIKey = 1041;
   ArtifactoryReferenceToken = 1042;
+  MercadoPago = 1043;
 }
 
 message Result {