diff --git a/packages/phone-number-privacy/combiner/src/common/crypto-clients/crypto-client.ts b/packages/phone-number-privacy/combiner/src/common/crypto-clients/crypto-client.ts
index 2fd8580420a..c57783a3051 100644
--- a/packages/phone-number-privacy/combiner/src/common/crypto-clients/crypto-client.ts
+++ b/packages/phone-number-privacy/combiner/src/common/crypto-clients/crypto-client.ts
@@ -1,5 +1,6 @@
 import { ErrorMessage, KeyVersionInfo } from '@celo/phone-number-privacy-common'
 import Logger from 'bunyan'
+import { performance } from 'perf_hooks'
 
 export interface ServicePartialSignature {
   url: string
@@ -38,7 +39,17 @@ export abstract class CryptoClient {
         `${ErrorMessage.NOT_ENOUGH_PARTIAL_SIGNATURES} ${this.allSignaturesLength}/${threshold}`
       )
     }
-    return this._combineBlindedSignatureShares(blindedMessage, logger)
+
+    const start = `Start combineBlindedSignatureShares`
+    const end = `End combineBlindedSignatureShares`
+    performance.mark(start)
+
+    const combinedSignature = this._combineBlindedSignatureShares(blindedMessage, logger)
+
+    performance.mark(end)
+    performance.measure('combineBlindedSignatureShares', start, end)
+
+    return combinedSignature
   }
 
   /*
diff --git a/packages/phone-number-privacy/signer/src/pnp/endpoints/sign/action.ts b/packages/phone-number-privacy/signer/src/pnp/endpoints/sign/action.ts
index 19982f13306..4ffe7151d91 100644
--- a/packages/phone-number-privacy/signer/src/pnp/endpoints/sign/action.ts
+++ b/packages/phone-number-privacy/signer/src/pnp/endpoints/sign/action.ts
@@ -11,7 +11,7 @@ import { computeBlindedSignature } from '../../../common/bls/bls-cryptography-cl
 import { REQUESTS_TABLE } from '../../../common/database/models/request'
 import { getRequestExists } from '../../../common/database/wrappers/request'
 import { DefaultKeyName, Key, KeyProvider } from '../../../common/key-management/key-provider-base'
-import { Counters } from '../../../common/metrics'
+import { Counters, Histograms, meter } from '../../../common/metrics'
 import { SignerConfig } from '../../../config'
 import { PnpQuotaService } from '../../services/quota'
 import { PnpSession } from '../../session'
@@ -113,10 +113,14 @@ export class PnpSignAction implements Action<SignMessageRequest> {
         }
 
         try {
-          const signature = await this.sign(
-            session.request.body.blindedQueryPhoneNumber,
-            key,
-            session
+          const signature = await meter(
+            this.sign,
+            [session.request.body.blindedQueryPhoneNumber, key, session],
+            (err: any) => {
+              throw err
+            },
+            Histograms.getBlindedSigInstrumentation,
+            ['sign']
           )
           this.io.sendSuccess(200, session.response, key, signature, quotaStatus, session.errors)
           return