diff --git a/test/integration/control.js b/test/integration/control.js
index 5e4fd98..e6ce678 100644
--- a/test/integration/control.js
+++ b/test/integration/control.js
@@ -8,6 +8,10 @@ const BCHJS = require("../../src/bch-js")
 const bchjs = new BCHJS()
 
 describe(`#control`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#getNetworkInfo`, () => {
     it("should get info on the full node", async () => {
       const result = await bchjs.Control.getNetworkInfo()
@@ -17,3 +21,7 @@ describe(`#control`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/electrumx.js b/test/integration/electrumx.js
index 1c706c5..38dc38d 100644
--- a/test/integration/electrumx.js
+++ b/test/integration/electrumx.js
@@ -7,7 +7,13 @@ const bchjs = new BCHJS()
 
 describe(`#ElectrumX`, () => {
   let sandbox
-  beforeEach(() => (sandbox = sinon.createSandbox()))
+
+  beforeEach(async () => {
+    sandbox = sinon.createSandbox()
+
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   afterEach(() => sandbox.restore())
 
   describe(`#utxo`, () => {
@@ -354,3 +360,7 @@ describe(`#ElectrumX`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/encryption.js b/test/integration/encryption.js
index edf1747..8ab9d64 100644
--- a/test/integration/encryption.js
+++ b/test/integration/encryption.js
@@ -4,6 +4,10 @@ const BCHJS = require("../../src/bch-js")
 const bchjs = new BCHJS()
 
 describe("#Encryption", () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe("#getPubKey", () => {
     it("should get a public key", async () => {
       const addr = "bitcoincash:qpf8jv9hmqcda0502gjp7nm3g24y5h5s4unutghsxq"
@@ -29,3 +33,7 @@ describe("#Encryption", () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/ninsight.js b/test/integration/ninsight.js
index b90213b..ce3842a 100644
--- a/test/integration/ninsight.js
+++ b/test/integration/ninsight.js
@@ -7,7 +7,13 @@ const bchjs = new BCHJS({ ninsightURL: "https://rest.bitcoin.com/v2" })
 
 describe(`#Ninsight`, () => {
   let sandbox
-  beforeEach(() => (sandbox = sinon.createSandbox()))
+
+  beforeEach(async () => {
+    sandbox = sinon.createSandbox()
+
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   afterEach(() => sandbox.restore())
 
   describe(`#utxo`, () => {
@@ -55,3 +61,7 @@ describe(`#Ninsight`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/openbazaar.js b/test/integration/openbazaar.js
index 1bd149d..f888b0b 100644
--- a/test/integration/openbazaar.js
+++ b/test/integration/openbazaar.js
@@ -8,6 +8,10 @@ const BCHJS = require("../../src/bch-js")
 const bchjs = new BCHJS()
 
 describe(`#OpenBazaar`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#Balance`, () => {
     it(`should GET balance for a single address`, async () => {
       const addr = "bitcoincash:qqh793x9au6ehvh7r2zflzguanlme760wuzehgzjh9"
@@ -79,3 +83,7 @@ describe(`#OpenBazaar`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/price.js b/test/integration/price.js
index 579d65f..1648405 100644
--- a/test/integration/price.js
+++ b/test/integration/price.js
@@ -3,6 +3,10 @@ const BCHJS = require("../../src/bch-js")
 const bchjs = new BCHJS()
 
 describe("#price", () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe("#current", () => {
     describe("#single currency", () => {
       it("should get current price for single currency", async () => {
@@ -31,3 +35,7 @@ describe("#price", () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/rawtransaction.js b/test/integration/rawtransaction.js
index b6b4038..4be5bcf 100644
--- a/test/integration/rawtransaction.js
+++ b/test/integration/rawtransaction.js
@@ -19,6 +19,10 @@ util.inspect.defaultOptions = {
 }
 
 describe("#rawtransaction", () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe("#decodeRawTransaction", () => {
     it("should decode tx for a single hex", async () => {
       const hex =
@@ -279,3 +283,7 @@ describe("#rawtransaction", () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/slp.js b/test/integration/slp.js
index cab94d3..9d39392 100644
--- a/test/integration/slp.js
+++ b/test/integration/slp.js
@@ -24,7 +24,7 @@ describe(`#SLP`, () => {
 
   beforeEach(async () => {
     // Introduce a delay so that the BVT doesn't trip the rate limits.
-    await sleep(1000)
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
 
     bchjs = new BCHJS()
   })
diff --git a/test/integration/test-free-tier-bchn.sh b/test/integration/test-free-tier-bchn.sh
index 2a5faea..f0a1cb9 100755
--- a/test/integration/test-free-tier-bchn.sh
+++ b/test/integration/test-free-tier-bchn.sh
@@ -2,6 +2,7 @@
 
 export RESTURL=https://bchn-free-main.fullstack.cash/v3/
 #export RESTURL=http://localhost:3000/v3/
+export IS_USING_FREE_TIER=true
 
 cd test/integration/bchn/
 mocha --timeout 30000 blockchain.js control.js electrumx.js ninsight.js openbazaar.js price.js rawtransaction.js slp.js util.js
diff --git a/test/integration/testnet/blockbook.js b/test/integration/testnet/blockbook.js
index d286f6e..18d7c31 100644
--- a/test/integration/testnet/blockbook.js
+++ b/test/integration/testnet/blockbook.js
@@ -26,6 +26,10 @@ util.inspect.defaultOptions = {
 }
 
 describe(`#Blockbook`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#Balance`, () => {
     it(`should GET balance for a single address`, async () => {
       const addr = "bchtest:qrvn2n228aa39xupcw9jw0d3fj8axxky656e4j62z2"
@@ -165,7 +169,7 @@ describe(`#Blockbook`, () => {
         for (let i = 0; i < 25; i++)
           addr.push("bchtest:qrvn2n228aa39xupcw9jw0d3fj8axxky656e4j62z2")
 
-        const result = await bchjs.Blockbook.utxo(addr)
+        await bchjs.Blockbook.utxo(addr)
         //console.log(`result: ${util.inspect(result)}`)
 
         assert.equal(true, false, "Unexpected result!")
@@ -176,3 +180,7 @@ describe(`#Blockbook`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/blockchain.js b/test/integration/testnet/blockchain.js
index 961f252..3d777f8 100644
--- a/test/integration/testnet/blockchain.js
+++ b/test/integration/testnet/blockchain.js
@@ -12,7 +12,7 @@ const assert = chai.assert
 
 const RESTURL = process.env.RESTURL
   ? process.env.RESTURL
-  : `https://tapi.fullstack.cash/v3/`
+  : "https://tapi.fullstack.cash/v3/"
 // if (process.env.RESTURL) RESTURL = process.env.RESTURL
 
 const BCHJS = require("../../../src/bch-js")
@@ -27,11 +27,15 @@ util.inspect.defaultOptions = {
   depth: 3
 }
 
-describe(`#blockchain`, () => {
-  describe(`#getBestBlockHash`, () => {
-    it(`should GET best block hash`, async () => {
+describe("#blockchain", () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
+  describe("#getBestBlockHash", () => {
+    it("should GET best block hash", async () => {
       const result = await bchjs.Blockchain.getBestBlockHash()
-      //console.log(`result: ${util.inspect(result)}`)
+      // console.log(`result: ${util.inspect(result)}`)
 
       assert.isString(result)
       assert.equal(result.length, 64, "Specific hash length")
@@ -39,7 +43,7 @@ describe(`#blockchain`, () => {
   })
 
   describe("#getBlockHeader", () => {
-    it(`should GET block header for a single hash`, async () => {
+    it("should GET block header for a single hash", async () => {
       const hash =
         "000000000000c57178ace90210289e6b5383134c5b5306e1cdd8395176e10aaf"
 
@@ -64,7 +68,7 @@ describe(`#blockchain`, () => {
       ])
     })
 
-    it(`should GET block headers for an array of hashes`, async () => {
+    it("should GET block headers for an array of hashes", async () => {
       const hash = [
         "000000000000c57178ace90210289e6b5383134c5b5306e1cdd8395176e10aaf",
         "00000000000b7db4cbae48d852fcbef32f728014582094ad613fe12af6600ff2"
@@ -92,21 +96,7 @@ describe(`#blockchain`, () => {
       ])
     })
 
-    it(`should throw an error for improper input`, async () => {
-      try {
-        const hash = 12345
-
-        await bchjs.Blockchain.getBlockHeader(hash)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        assert.include(
-          err.message,
-          `Input hash must be a string or array of strings`
-        )
-      }
-    })
-
-    it(`should throw error on array size rate limit`, async () => {
+    it("should throw error on array size rate limit", async () => {
       try {
         const data = []
         for (let i = 0; i < 25; i++) {
@@ -115,7 +105,7 @@ describe(`#blockchain`, () => {
           )
         }
 
-        const result = await bchjs.Blockchain.getBlockHeader(data)
+        await bchjs.Blockchain.getBlockHeader(data)
 
         // console.log(`result: ${util.inspect(result)}`)
         assert.equal(true, false, "Unexpected result!")
@@ -178,7 +168,7 @@ describe(`#blockchain`, () => {
     })
     */
 
-    it(`should throw an error if txid is not in mempool`, async () => {
+    it("should throw an error if txid is not in mempool", async () => {
       try {
         const txid =
           "1f121fb6a33f48cd426dde06aa20ce589dd97becabb835a8d33071cbf40c7d04"
@@ -187,39 +177,25 @@ describe(`#blockchain`, () => {
 
         assert.equal(true, false, "Unexpected result!")
       } catch (err) {
-        //console.log(`err: ${util.inspect(err)}`)
+        // console.log(`err: ${util.inspect(err)}`)
         assert.hasAnyKeys(err, ["error"])
-        assert.include(err.error, `Transaction not in mempool`)
-      }
-    })
-
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const txid = 12345
-
-        await bchjs.Blockchain.getMempoolEntry(txid)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings`
-        )
+        assert.include(err.error, "Transaction not in mempool")
       }
     })
   })
 
-  describe(`#getTxOutProof`, () => {
-    it(`should get single tx out proof`, async () => {
+  describe("#getTxOutProof", () => {
+    it("should get single tx out proof", async () => {
       const txid =
         "1f121fb6a33f48cd426dde06aa20ce589dd97becabb835a8d33071cbf40c7d04"
 
       const result = await bchjs.Blockchain.getTxOutProof(txid)
-      //console.log(`result: ${JSON.stringify(result, null, 2)}`)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
 
       assert.isString(result)
     })
 
-    it(`should get an array of tx out proofs`, async () => {
+    it("should get an array of tx out proofs", async () => {
       const txid = [
         "1f121fb6a33f48cd426dde06aa20ce589dd97becabb835a8d33071cbf40c7d04",
         "fc4f696c0ebb3d0994b3975f57d85be75ef752b9fd52c17e361ec3be2fa3e752"
@@ -231,27 +207,13 @@ describe(`#blockchain`, () => {
       assert.isArray(result)
       assert.isString(result[0])
     })
-
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const txid = 12345
-
-        await bchjs.Blockchain.getTxOutProof(txid)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings`
-        )
-      }
-    })
   })
 
-  describe(`#verifyTxOutProof`, () => {
+  describe("#verifyTxOutProof", () => {
     const mockTxOutProof =
       "00000020ac86ce8f2bda235c0dc135d18f6a777c44b121e8f41db8a51ca65000000000000cd4de3c49337712f3a1092c47c3bf73ec2f9b1cfd289ee991ede0b6eab4df229d5b8c5dffff001d82ce005b0700000003ec55d9142eac2c1d2229e5af24898b2590c111b62e2787fa1998d3d713fd432fd557124ed758fa156a6cdc6d317d5575aec2b86dfb159c62ecb4743f28bef1cb52e7a32fbec31e367ec152fdb952f75ee75bd8575f97b394093dbb0e6c694ffc0135"
 
-    it(`should verify a single proof`, async () => {
+    it("should verify a single proof", async () => {
       const result = await bchjs.Blockchain.verifyTxOutProof(mockTxOutProof)
       // console.log(`result: ${JSON.stringify(result, null, 2)}`)
 
@@ -263,10 +225,10 @@ describe(`#blockchain`, () => {
       )
     })
 
-    it(`should verify an array of proofs`, async () => {
+    it("should verify an array of proofs", async () => {
       const proofs = [mockTxOutProof, mockTxOutProof]
       const result = await bchjs.Blockchain.verifyTxOutProof(proofs)
-      //console.log(`result: ${JSON.stringify(result, null, 2)}`)
+      // console.log(`result: ${JSON.stringify(result, null, 2)}`)
 
       assert.isArray(result)
       assert.isString(result[0])
@@ -276,21 +238,7 @@ describe(`#blockchain`, () => {
       )
     })
 
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const txid = 12345
-
-        await bchjs.Blockchain.verifyTxOutProof(txid)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings`
-        )
-      }
-    })
-
-    it(`should throw error on array size rate limit`, async () => {
+    it("should throw error on array size rate limit", async () => {
       try {
         const data = []
         for (let i = 0; i < 25; i++) data.push(mockTxOutProof)
@@ -306,3 +254,7 @@ describe(`#blockchain`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/control.js b/test/integration/testnet/control.js
index e1e36e9..863cafd 100644
--- a/test/integration/testnet/control.js
+++ b/test/integration/testnet/control.js
@@ -13,6 +13,10 @@ const BCHJS = require("../../../src/bch-js")
 const bchjs = new BCHJS({ restURL: RESTURL, apiToken: process.env.BCHJSTOKEN })
 
 describe(`#control`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#getNetworkInfo`, () => {
     it("should get info on the full node", async () => {
       const result = await bchjs.Control.getNetworkInfo()
@@ -22,3 +26,7 @@ describe(`#control`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/electrumx.js b/test/integration/testnet/electrumx.js
index 7886803..c880ab4 100644
--- a/test/integration/testnet/electrumx.js
+++ b/test/integration/testnet/electrumx.js
@@ -11,7 +11,13 @@ const bchjs = new BCHJS({ restURL: RESTURL, apiToken: process.env.BCHJSTOKEN })
 
 describe(`#ElectrumX`, () => {
   let sandbox
-  beforeEach(() => (sandbox = sinon.createSandbox()))
+
+  beforeEach(async () => {
+    sandbox = sinon.createSandbox()
+
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   afterEach(() => sandbox.restore())
 
   describe(`#utxo`, () => {
@@ -358,3 +364,7 @@ describe(`#ElectrumX`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/ninsight.js b/test/integration/testnet/ninsight.js
index 7f913fc..fe1351e 100644
--- a/test/integration/testnet/ninsight.js
+++ b/test/integration/testnet/ninsight.js
@@ -7,7 +7,13 @@ const bchjs = new BCHJS({ ninsightURL: "https://trest.bitcoin.com/v2" })
 
 describe(`#Ninsight`, () => {
   let sandbox
-  beforeEach(() => (sandbox = sinon.createSandbox()))
+
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+
+    sandbox = sinon.createSandbox()
+  })
+
   afterEach(() => sandbox.restore())
 
   describe(`#utxo`, () => {
@@ -63,3 +69,7 @@ describe(`#Ninsight`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/openbazaar.js b/test/integration/testnet/openbazaar.js
deleted file mode 100644
index 9d02775..0000000
--- a/test/integration/testnet/openbazaar.js
+++ /dev/null
@@ -1,124 +0,0 @@
-/*
-  tests for OpenBazaar library.
-*/
-
-// Force testnet call to OB1 servers.
-process.env.NETWORK = "testnet"
-
-const chai = require("chai")
-const assert = chai.assert
-
-const RESTURL = process.env.RESTURL
-  ? process.env.RESTURL
-  : `https://tapi.fullstack.cash/v3/`
-
-const BCHJS = require("../../../src/bch-js")
-const bchjs = new BCHJS({ restURL: RESTURL, apiToken: process.env.BCHJSTOKEN })
-
-describe(`#OpenBazaar`, () => {
-  describe(`#Balance`, () => {
-    // it(`should GET balance for a single address`, async () => {
-    //   const addr = "bchtest:qrvn2n228aa39xupcw9jw0d3fj8axxky656e4j62z2"
-    //
-    //   const result = await bchjs.OpenBazaar.balance(addr)
-    //   // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-    //
-    //   assert.hasAllKeys(result, [
-    //     "page",
-    //     "totalPages",
-    //     "itemsOnPage",
-    //     "addrStr",
-    //     "balance",
-    //     "totalReceived",
-    //     "totalSent",
-    //     "unconfirmedBalance",
-    //     "unconfirmedTxApperances",
-    //     "txApperances",
-    //     "transactions"
-    //   ])
-    //   assert.isArray(result.transactions)
-    // })
-
-    it(`should throw an error for improper input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.OpenBazaar.balance(addr)
-        // assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(err.message, `Input address must be a string`)
-      }
-    })
-  })
-
-  describe(`#utxo`, () => {
-    // it(`should GET utxos for a single address`, async () => {
-    //   const addr = "bchtest:qrvn2n228aa39xupcw9jw0d3fj8axxky656e4j62z2"
-    //
-    //   const result = await bchjs.OpenBazaar.utxo(addr)
-    //   // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-    //
-    //   assert.isArray(result)
-    //   assert.hasAllKeys(result[0], [
-    //     "txid",
-    //     "vout",
-    //     "amount",
-    //     "height",
-    //     "confirmations",
-    //     "satoshis"
-    //   ])
-    // })
-
-    it(`should throw an error for improper input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.OpenBazaar.utxo(addr)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(err.message, `Input address must be a string`)
-      }
-    })
-  })
-
-  describe(`#tx`, () => {
-    it(`should throw an error for improper input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.OpenBazaar.tx(addr)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(err.message, `Input txid must be a string`)
-      }
-    })
-
-    // it(`should GET transactions for a single address`, async () => {
-    //   const addr =
-    //     "ed4692f50a4553527dd26cd8674ca06a0ab2d366f3135ca3668310467ead3cbf"
-    //
-    //   const result = await bchjs.OpenBazaar.tx(addr)
-    //   // console.log(`result: ${JSON.stringify(result, null, 2)}`)
-    //
-    //   assert.hasAnyKeys(result, [
-    //     "txid",
-    //     "version",
-    //     "vin",
-    //     "vout",
-    //     "blockhash",
-    //     "blockheight",
-    //     "confirmations",
-    //     "blocktime",
-    //     "valueOut",
-    //     "valueIn",
-    //     "fees",
-    //     "hex"
-    //   ])
-    //   assert.isArray(result.vin)
-    //   assert.isArray(result.vout)
-    // })
-  })
-})
diff --git a/test/integration/testnet/rawtransaction.js b/test/integration/testnet/rawtransaction.js
index 4207d72..d2fa1fb 100644
--- a/test/integration/testnet/rawtransaction.js
+++ b/test/integration/testnet/rawtransaction.js
@@ -26,6 +26,10 @@ util.inspect.defaultOptions = {
 }
 
 describe("#rawtransaction", () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe("#decodeRawTransaction", () => {
     it("should decode tx for a single hex", async () => {
       const hex =
@@ -70,21 +74,6 @@ describe("#rawtransaction", () => {
       assert.isArray(result[0].vout)
     })
 
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.RawTransactions.decodeRawTransaction(addr)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings.`
-        )
-      }
-    })
-
     it(`should throw error on array size rate limit`, async () => {
       try {
         const data = []
@@ -239,22 +228,6 @@ describe("#rawtransaction", () => {
       const result = await bchjs.RawTransactions.decodeScript(hexes)
       console.log(`result ${JSON.stringify(result, null, 2)}`)
     })
-*/
-    /*
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.RawTransactions.decodeRawTransaction(addr)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings.`
-        )
-      }
-    })
 */
   })
 
@@ -299,21 +272,6 @@ describe("#rawtransaction", () => {
       }
     })
 
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const addr = 12345
-
-        await bchjs.RawTransactions.sendRawTransaction(addr)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(
-          err.message,
-          `Input hex must be a string or array of strings`
-        )
-      }
-    })
-
     it(`should throw error on array size rate limit`, async () => {
       try {
         const dataMock =
@@ -332,3 +290,7 @@ describe("#rawtransaction", () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/testnet/slp.js b/test/integration/testnet/slp.js
index 15e1c86..5ceb546 100644
--- a/test/integration/testnet/slp.js
+++ b/test/integration/testnet/slp.js
@@ -25,7 +25,7 @@ util.inspect.defaultOptions = {
 describe(`#SLP`, () => {
   beforeEach(async () => {
     // Introduce a delay so that the BVT doesn't trip the rate limits.
-    await sleep(1000)
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
   })
 
   describe("#util", () => {
@@ -73,22 +73,6 @@ describe(`#SLP`, () => {
   })
 
   describe("#balancesForAddress", () => {
-    it(`should throw an error if input is not a string or array of strings`, async () => {
-      try {
-        const address = 1234
-
-        await bchjs.SLP.Utils.balancesForAddress(address)
-
-        assert.equal(true, false, "Uh oh. Code path should not end here.")
-      } catch (err) {
-        //console.log(`Error: `, err)
-        assert.include(
-          err.message,
-          `Input address must be a string or array of strings`
-        )
-      }
-    })
-
     it(`should fetch all balances for address: slptest:qz0kc67pm4emjyr3gaaa2wstdaykg9m4yqwlzpj3w9`, async () => {
       // Mock the call to rest.bitcoin.com
       if (process.env.TEST === "unit") {
diff --git a/test/integration/testnet/test-free-tier.sh b/test/integration/testnet/test-free-tier.sh
index 623f10f..dd12f28 100755
--- a/test/integration/testnet/test-free-tier.sh
+++ b/test/integration/testnet/test-free-tier.sh
@@ -2,8 +2,8 @@
 
 export RESTURL=https://free-test.fullstack.cash/v3/
 export NETWORK=testnet
-#export RESTURL=http://localhost:3000/v3/
+export IS_USING_FREE_TIER=true
 
 cd test/integration/testnet/
-mocha --timeout 30000 blockchain.js control.js electrumx.js openbazaar.js rawtransaction.js slp.js util.js
+mocha --timeout 30000 blockchain.js control.js electrumx.js rawtransaction.js slp.js util.js
 #mocha --timeout 30000 blockchain.js
diff --git a/test/integration/testnet/util.js b/test/integration/testnet/util.js
index e3096e9..f30f076 100644
--- a/test/integration/testnet/util.js
+++ b/test/integration/testnet/util.js
@@ -24,6 +24,10 @@ util.inspect.defaultOptions = {
 }
 
 describe(`#util`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#validateAddress`, () => {
     it(`should return false for testnet addr on mainnet`, async () => {
       const address = `bitcoincash:qp4k8fjtgunhdr7yq30ha4peu`
@@ -82,21 +86,6 @@ describe(`#util`, () => {
       ])
     })
 
-    it(`should throw an error for improper single input`, async () => {
-      try {
-        const address = 15432
-
-        await bchjs.Util.validateAddress(address)
-        assert.equal(true, false, "Unexpected result!")
-      } catch (err) {
-        //console.log(`err: `, err)
-        assert.include(
-          err.message,
-          `Input must be a string or array of strings.`
-        )
-      }
-    })
-
     it(`should throw error on array size rate limit`, async () => {
       try {
         const dataMock = `bchtest:pq6k9969f6v6sg7a75jkru4n7wn9sknv5cztcp0dnh`
@@ -114,3 +103,7 @@ describe(`#util`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}
diff --git a/test/integration/util.js b/test/integration/util.js
index 35831a8..90dc34e 100644
--- a/test/integration/util.js
+++ b/test/integration/util.js
@@ -17,6 +17,10 @@ util.inspect.defaultOptions = {
 }
 
 describe(`#util`, () => {
+  beforeEach(async () => {
+    if (process.env.IS_USING_FREE_TIER) await sleep(1000)
+  })
+
   describe(`#validateAddress`, () => {
     it(`should return false for testnet addr on mainnet`, async () => {
       const address = `bchtest:qqqk4y6lsl5da64sg5qc3xezmplyu5kmpyz2ysaa5y`
@@ -92,3 +96,7 @@ describe(`#util`, () => {
     })
   })
 })
+
+function sleep(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms))
+}