diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c16c3e5ce..4c344c141c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,7 +4,7 @@
 - Add support for `api.rpc.engine.*` for manual seal support
 - Expand `.toHuman` on `ExtrinsicEra`, `SubmittableResult` & `Vote`
 - Remove `GenericDigestItem`, the `DigestItem` is now a type interface via `@polkadot/types/interfaces`
-- Move `H160`, `H256` & `H512` to interfaces in `@polkadot/types/interfaces`
+- Move `Fixed64`, `H160`, `H256` & `H512` to interfaces in `@polkadot/types/interfaces`
 - Align construction of unknown types via `registry.get` e.g. in Events, warn on detection, throw on use
 - Expose static `.with` on `UInt`, `Int` & `U8aFixed` classes with optional type name override
 - `UInt` & `Int` now does source bitLength checks upon construction
diff --git a/packages/typegen/src/generate/tsDef.ts b/packages/typegen/src/generate/tsDef.ts
index 8644a1e914..6a8cee04b2 100644
--- a/packages/typegen/src/generate/tsDef.ts
+++ b/packages/typegen/src/generate/tsDef.ts
@@ -66,6 +66,12 @@ function tsEnum (definitions: object, { name: enumName, sub }: TypeDef, imports:
   return exportInterface(enumName, 'Enum', keys.join(''));
 }
 
+function tsInt (definitions: object, def: TypeDef, imports: TypeImports, type: 'Int' | 'UInt' = 'Int'): string {
+  setImports(definitions, imports, [type]);
+
+  return exportInterface(def.name, type);
+}
+
 /** @internal */
 function tsResultGetter (definitions: object, resultName = '', getter: 'Ok' | 'Error', def: TypeDef, imports: TypeImports): string {
   const { info, type } = def;
@@ -124,9 +130,7 @@ function tsStruct (definitions: object, { name: structName, sub }: TypeDef, impo
 
 /** @internal */
 function tsUInt (definitions: object, def: TypeDef, imports: TypeImports): string {
-  setImports(definitions, imports, ['UInt']);
-
-  return exportInterface(def.name, 'UInt');
+  return tsInt(definitions, def, imports, 'UInt');
 }
 
 /** @internal */
@@ -154,6 +158,7 @@ function generateInterfaces (definitions: object, { types }: { types: Record<str
     [TypeDefInfo.BTreeSet]: tsBTreeSet,
     [TypeDefInfo.Compact]: tsCompact,
     [TypeDefInfo.Enum]: tsEnum,
+    [TypeDefInfo.Int]: tsInt,
     [TypeDefInfo.Linkage]: errorUnhandled,
     [TypeDefInfo.Null]: errorUnhandled,
     [TypeDefInfo.Option]: tsOption,
diff --git a/packages/types/src/codec/AbstractInt.ts b/packages/types/src/codec/AbstractInt.ts
index ee1e097df1..3ebbe90780 100644
--- a/packages/types/src/codec/AbstractInt.ts
+++ b/packages/types/src/codec/AbstractInt.ts
@@ -29,15 +29,15 @@ export default abstract class AbstractInt extends BN implements Codec {
 
   private _isHexJson: boolean;
 
-  private _isNegative: boolean;
+  private _isSigned: boolean;
 
-  protected constructor (registry: Registry, isNegative: boolean, value: AnyNumber = 0, bitLength: UIntBitLength = DEFAULT_UINT_BITS, isHexJson = true) {
-    super(AbstractInt.decodeAbstracInt(value, bitLength, isNegative));
+  protected constructor (registry: Registry, isSigned: boolean, value: AnyNumber = 0, bitLength: UIntBitLength = DEFAULT_UINT_BITS, isHexJson = true) {
+    super(AbstractInt.decodeAbstracInt(value, bitLength, isSigned));
 
     this.registry = registry;
     this._bitLength = bitLength;
     this._isHexJson = isHexJson;
-    this._isNegative = isNegative;
+    this._isSigned = isSigned;
 
     assert(super.bitLength() <= bitLength, `${this.toRawType()}: Input too large. Found input with ${super.bitLength()} bits, expected ${bitLength}`);
   }
@@ -93,6 +93,13 @@ export default abstract class AbstractInt extends BN implements Codec {
     return this.isZero();
   }
 
+  /**
+   * @description Checks if the value is an unsigned type
+   */
+  public get isUnsigned (): boolean {
+    return !this._isSigned;
+  }
+
   /**
    * @description Returns the number of bits in the value
    */
@@ -109,7 +116,7 @@ export default abstract class AbstractInt extends BN implements Codec {
     // number and BN inputs (no `.eqn` needed) - numbers will be converted
     return super.eq(
       isHex(other)
-        ? hexToBn(other.toString(), { isLe: false, isNegative: this._isNegative })
+        ? hexToBn(other.toString(), { isLe: false, isNegative: this._isSigned })
         : bnToBn(other)
     );
   }
diff --git a/packages/types/src/codec/index.ts b/packages/types/src/codec/index.ts
index d3fe62ecf5..28b9bb8ff9 100644
--- a/packages/types/src/codec/index.ts
+++ b/packages/types/src/codec/index.ts
@@ -22,6 +22,7 @@ export { default as Tuple } from './Tuple';
 export { default as Vec } from './Vec';
 
 // Convenience base classes, used as "anything of this type" bases
+export { default as Int } from './Int';
 export { default as Raw } from './Raw';
 export { default as UInt } from './UInt';
 export { default as U8aFixed } from './U8aFixed';
diff --git a/packages/types/src/codec/utils/encodeTypes.ts b/packages/types/src/codec/utils/encodeTypes.ts
index df306f9ad3..d626a77c6e 100644
--- a/packages/types/src/codec/utils/encodeTypes.ts
+++ b/packages/types/src/codec/utils/encodeTypes.ts
@@ -103,12 +103,12 @@ function encodeTuple (typeDef: Pick<TypeDef, any>): string {
   })`;
 }
 
-function encodeUInt (typeDef: Pick<TypeDef, any>): string {
+function encodeUInt (typeDef: Pick<TypeDef, any>, type: 'Int' | 'UInt'): string {
   assert(typeDef.ext, 'Unable to encode VecFixed type');
 
   const { length } = typeDef.ext as TypeDefExtUInt;
 
-  return `UInt<${length}>`;
+  return `${type}<${length}>`;
 }
 
 function encodeVecFixed (typeDef: Pick<TypeDef, any>): string {
@@ -126,6 +126,7 @@ const encoders: Record<TypeDefInfo, (typeDef: TypeDef) => string> = {
   [TypeDefInfo.BTreeSet]: (typeDef: TypeDef): string => encodeWithParams(typeDef, 'BTreeSet'),
   [TypeDefInfo.Compact]: (typeDef: TypeDef): string => encodeWithParams(typeDef, 'Compact'),
   [TypeDefInfo.Enum]: (typeDef: TypeDef): string => encodeEnum(typeDef),
+  [TypeDefInfo.Int]: (typeDef: TypeDef): string => encodeUInt(typeDef, 'Int'),
   [TypeDefInfo.Linkage]: (typeDef: TypeDef): string => encodeWithParams(typeDef, 'Linkage'),
   // eslint-disable-next-line @typescript-eslint/no-unused-vars
   [TypeDefInfo.Null]: (typeDef: TypeDef): string => 'Null',
@@ -135,7 +136,7 @@ const encoders: Record<TypeDefInfo, (typeDef: TypeDef) => string> = {
   [TypeDefInfo.Set]: (typeDef: TypeDef): string => typeDef.type,
   [TypeDefInfo.Struct]: (typeDef: TypeDef): string => encodeStruct(typeDef),
   [TypeDefInfo.Tuple]: (typeDef: TypeDef): string => encodeTuple(typeDef),
-  [TypeDefInfo.UInt]: (typeDef: TypeDef): string => encodeUInt(typeDef),
+  [TypeDefInfo.UInt]: (typeDef: TypeDef): string => encodeUInt(typeDef, 'UInt'),
   [TypeDefInfo.Vec]: (typeDef: TypeDef): string => encodeWithParams(typeDef, 'Vec'),
   [TypeDefInfo.VecFixed]: (typeDef: TypeDef): string => encodeVecFixed(typeDef)
 };
diff --git a/packages/types/src/create/createClass.ts b/packages/types/src/create/createClass.ts
index 8b8c0a2eb3..ffbd001513 100644
--- a/packages/types/src/create/createClass.ts
+++ b/packages/types/src/create/createClass.ts
@@ -11,6 +11,7 @@ import BTreeMap from '../codec/BTreeMap';
 import BTreeSet from '../codec/BTreeSet';
 import Compact from '../codec/Compact';
 import Enum from '../codec/Enum';
+import Int from '../codec/Int';
 import Option from '../codec/Option';
 import Result from '../codec/Result';
 import CodecSet from '../codec/Set';
@@ -76,6 +77,14 @@ function getTypeClassArray (value: TypeDef): (InterfaceTypes)[] {
   );
 }
 
+function createInt (value: TypeDef, Clazz: typeof Int | typeof UInt): Constructor {
+  assert(value.ext, `Expected bitLength information for ${Clazz.constructor.name}<bitLength>`);
+
+  const ext = value.ext as TypeDefExtUInt;
+
+  return Clazz.with(ext.length, ext.typeName);
+}
+
 const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => Constructor> = {
   [TypeDefInfo.BTreeMap]: (registry: Registry, value: TypeDef): Constructor => {
     const [keyType, valueType] = getTypeClassArray(value);
@@ -90,6 +99,8 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
 
   [TypeDefInfo.Enum]: (registry: Registry, value: TypeDef): Constructor => Enum.with(getTypeClassMap(value)),
 
+  [TypeDefInfo.Int]: (registry: Registry, value: TypeDef): Constructor => createInt(value, Int),
+
   // We have circular deps between Linkage & Struct
   [TypeDefInfo.Linkage]: (registry: Registry, value: TypeDef): Constructor => {
     const type = `Option<${getSubType(value)}>`;
@@ -133,13 +144,7 @@ const infoMapping: Record<TypeDefInfo, (registry: Registry, value: TypeDef) => C
 
   [TypeDefInfo.Tuple]: (registry: Registry, value: TypeDef): Constructor => Tuple.with(getTypeClassArray(value)),
 
-  [TypeDefInfo.UInt]: (registry: Registry, value: TypeDef): Constructor => {
-    assert(value.ext, 'Expected bitLength information for UInt<bitLength>');
-
-    const ext = value.ext as TypeDefExtUInt;
-
-    return UInt.with(ext.length, ext.typeName);
-  },
+  [TypeDefInfo.UInt]: (registry: Registry, value: TypeDef): Constructor => createInt(value, UInt),
 
   [TypeDefInfo.Vec]: (registry: Registry, value: TypeDef): Constructor => {
     const subType = getSubType(value);
diff --git a/packages/types/src/create/createType.spec.ts b/packages/types/src/create/createType.spec.ts
index b5e992f013..a20a1dc785 100644
--- a/packages/types/src/create/createType.spec.ts
+++ b/packages/types/src/create/createType.spec.ts
@@ -2,6 +2,7 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
+import Int from '../codec/Int';
 import CodecSet from '../codec/Set';
 import { createClass, createType, createTypeUnsafe, ClassOf, TypeRegistry } from '.';
 
@@ -10,13 +11,22 @@ describe('createType', (): void => {
 
   it('allows creation of a H256 (with proper toRawType)', (): void => {
     expect(
-      createTypeUnsafe(registry, 'H256').toRawType()
+      createType(registry, 'H256').toRawType()
     ).toEqual('H256');
     expect(
-      createTypeUnsafe(registry, 'Hash').toRawType()
+      createType(registry, 'Hash').toRawType()
     ).toEqual('H256');
   });
 
+  it('allows creation of a Fixed64 (with proper toRawType & instance)', (): void => {
+    const f64 = createType(registry, 'Fixed64');
+
+    expect(f64.toRawType()).toEqual('Fixed64');
+    expect(f64.bitLength()).toEqual(64);
+    expect(f64.isUnsigned).toBe(false);
+    expect(f64 instanceof Int).toBe(true);
+  });
+
   it('allows creation of a Struct', (): void => {
     const raw = '{"balance":"Balance","index":"u32"}';
     const struct = createTypeUnsafe(registry, raw, [{
diff --git a/packages/types/src/create/getTypeDef.ts b/packages/types/src/create/getTypeDef.ts
index 5fce6cf5e4..8848b604ee 100644
--- a/packages/types/src/create/getTypeDef.ts
+++ b/packages/types/src/create/getTypeDef.ts
@@ -90,20 +90,24 @@ function _decodeTuple (value: TypeDef, _: string, subType: string): TypeDef {
   return value;
 }
 
-// decode a fixed vector, e.g. [u8;32]
+// decode a Int/UInt<bitLength[, name]>
 // eslint-disable-next-line @typescript-eslint/no-unused-vars
-function _decodeUInt (value: TypeDef, type: string, _: string): TypeDef {
-  const _bitLength = type.substr(5, type.length - 6);
-  const length = parseInt(_bitLength.trim(), 10);
+function _decodeInt (value: TypeDef, type: string, _: string, clazz: 'Int' | 'UInt' = 'Int'): TypeDef {
+  const [strLength, typeName] = type.substr(clazz.length + 1, type.length - clazz.length - 1 - 1).split(',');
+  const length = parseInt(strLength.trim(), 10);
 
   // as a first round, only u8 via u8aFixed, we can add more support
-  assert(length <= 8192 && (length % 8) === 0, `${type}: Only support for UInt<bitLength>, where length <= 8192 and a power of 8`);
+  assert(length <= 8192 && (length % 8) === 0, `${type}: Only support for ${clazz}<bitLength>, where length <= 8192 and a power of 8, found ${length}`);
 
-  value.ext = { length } as TypeDefExtUInt;
+  value.ext = { length, typeName } as TypeDefExtUInt;
 
   return value;
 }
 
+function _decodeUInt (value: TypeDef, type: string, subType: string): TypeDef {
+  return _decodeInt(value, type, subType, 'UInt');
+}
+
 function hasWrapper (type: string, [start, end]: [string, string, TypeDefInfo, any?]): boolean {
   if (type.substr(0, start.length) !== start) {
     return false;
@@ -120,6 +124,7 @@ const nestedExtraction: [string, string, TypeDefInfo, (value: TypeDef, type: str
   ['(', ')', TypeDefInfo.Tuple, _decodeTuple],
   // the inner for these are the same as tuple, multiple values
   ['BTreeMap<', '>', TypeDefInfo.BTreeMap, _decodeTuple],
+  ['Int<', '>', TypeDefInfo.Int, _decodeInt],
   ['Result<', '>', TypeDefInfo.Result, _decodeTuple],
   ['UInt<', '>', TypeDefInfo.UInt, _decodeUInt]
 ];
diff --git a/packages/types/src/create/sanitize.ts b/packages/types/src/create/sanitize.ts
index 0ee323a780..eda010f2d4 100644
--- a/packages/types/src/create/sanitize.ts
+++ b/packages/types/src/create/sanitize.ts
@@ -5,7 +5,7 @@
 
 type Mapper = (value: string) => string;
 
-const ALLOWED_BOXES = ['BTreeMap', 'BTreeSet', 'Compact', 'Linkage', 'Result', 'Option', 'UInt', 'Vec'];
+const ALLOWED_BOXES = ['BTreeMap', 'BTreeSet', 'Compact', 'Int', 'Linkage', 'Result', 'Option', 'UInt', 'Vec'];
 const BOX_PRECEDING = ['<', '(', '[', '"', ',', ' ']; // start of vec, tuple, fixed array, part of struct def or in tuple
 
 const mappings: Mapper[] = [
diff --git a/packages/types/src/create/types.ts b/packages/types/src/create/types.ts
index dc2ac49808..4e3104a4df 100644
--- a/packages/types/src/create/types.ts
+++ b/packages/types/src/create/types.ts
@@ -26,6 +26,7 @@ export enum TypeDefInfo {
   Tuple,
   Vec,
   VecFixed,
+  Int,
   UInt,
   // anything not fully supported (keep this as the last entry)
   Null
diff --git a/packages/types/src/interfaceRegistry.ts b/packages/types/src/interfaceRegistry.ts
index 5f41d56037..7c790cc1a0 100644
--- a/packages/types/src/interfaceRegistry.ts
+++ b/packages/types/src/interfaceRegistry.ts
@@ -2,8 +2,8 @@
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
 import { Compact, Option, Raw, Vec } from '@polkadot/types/codec';
-import { BitVec, Bytes, Data, Fixed64, IdentityFields, Null, StorageData, StorageKey, Text, Type, U256, Unconstructable, bool, i128, i16, i256, i32, i64, i8, u128, u16, u256, u32, u64, u8, usize } from '@polkadot/types/primitive';
-import { AccountId, AccountIdOf, AccountIndex, Address, AssetId, Balance, BalanceOf, Block, BlockNumber, Call, ChangesTrieConfiguration, Consensus, ConsensusEngineId, Digest, DigestItem, DispatchClass, DispatchInfo, DispatchInfoTo190, EcdsaSignature, Ed25519Signature, Extrinsic, ExtrinsicEra, ExtrinsicPayload, ExtrinsicPayloadUnknown, ExtrinsicPayloadV1, ExtrinsicPayloadV2, ExtrinsicPayloadV3, ExtrinsicPayloadV4, ExtrinsicSignatureV1, ExtrinsicSignatureV2, ExtrinsicSignatureV3, ExtrinsicSignatureV4, ExtrinsicUnknown, ExtrinsicV1, ExtrinsicV2, ExtrinsicV3, ExtrinsicV4, H160, H256, H512, Hash, Header, ImmortalEra, Index, Justification, KeyTypeId, KeyValue, LockIdentifier, LookupSource, LookupTarget, Moment, MortalEra, MultiSignature, Origin, Perbill, Percent, Permill, Perquintill, Phantom, PhantomData, PreRuntime, Seal, SealV0, Signature, SignedBlock, SignerPayload, Sr25519Signature, ValidatorId, Weight, WeightMultiplier } from '@polkadot/types/interfaces/runtime';
+import { BitVec, Bytes, Data, IdentityFields, Null, StorageData, StorageKey, Text, Type, U256, Unconstructable, bool, i128, i16, i256, i32, i64, i8, u128, u16, u256, u32, u64, u8, usize } from '@polkadot/types/primitive';
+import { AccountId, AccountIdOf, AccountIndex, Address, AssetId, Balance, BalanceOf, Block, BlockNumber, Call, ChangesTrieConfiguration, Consensus, ConsensusEngineId, Digest, DigestItem, DispatchClass, DispatchInfo, DispatchInfoTo190, EcdsaSignature, Ed25519Signature, Extrinsic, ExtrinsicEra, ExtrinsicPayload, ExtrinsicPayloadUnknown, ExtrinsicPayloadV1, ExtrinsicPayloadV2, ExtrinsicPayloadV3, ExtrinsicPayloadV4, ExtrinsicSignatureV1, ExtrinsicSignatureV2, ExtrinsicSignatureV3, ExtrinsicSignatureV4, ExtrinsicUnknown, ExtrinsicV1, ExtrinsicV2, ExtrinsicV3, ExtrinsicV4, Fixed64, H160, H256, H512, Hash, Header, ImmortalEra, Index, Justification, KeyTypeId, KeyValue, LockIdentifier, LookupSource, LookupTarget, Moment, MortalEra, MultiSignature, Origin, Perbill, Percent, Permill, Perquintill, Phantom, PhantomData, PreRuntime, Seal, SealV0, Signature, SignedBlock, SignerPayload, Sr25519Signature, ValidatorId, Weight, WeightMultiplier } from '@polkadot/types/interfaces/runtime';
 import { InclusionHeight, Uncle, UncleEntryItem } from '@polkadot/types/interfaces/authorship';
 import { RawAuraPreDigest } from '@polkadot/types/interfaces/aura';
 import { BabeAuthorityWeight, BabeBlockWeight, BabeWeight, MaybeVrf, RawBabePreDigest, RawBabePreDigestCompat, RawBabePreDigestPrimary, RawBabePreDigestPrimaryTo159, RawBabePreDigestSecondary, RawBabePreDigestSecondaryTo159, RawBabePreDigestTo159, SlotNumber, VrfData, VrfProof } from '@polkadot/types/interfaces/babe';
@@ -64,9 +64,6 @@ export interface InterfaceRegistry {
   i64: i64;
   'Option<i64>': Option<i64>;
   'Vec<i64>': Vec<i64>;
-  Fixed64: Fixed64;
-  'Option<Fixed64>': Option<Fixed64>;
-  'Vec<Fixed64>': Vec<Fixed64>;
   i128: i128;
   'Option<i128>': Option<i128>;
   'Vec<i128>': Vec<i128>;
@@ -231,6 +228,9 @@ export interface InterfaceRegistry {
   DispatchInfoTo190: DispatchInfoTo190;
   'Option<DispatchInfoTo190>': Option<DispatchInfoTo190>;
   'Vec<DispatchInfoTo190>': Vec<DispatchInfoTo190>;
+  Fixed64: Fixed64;
+  'Option<Fixed64>': Option<Fixed64>;
+  'Vec<Fixed64>': Vec<Fixed64>;
   H160: H160;
   'Option<H160>': Option<H160>;
   'Vec<H160>': Vec<H160>;
diff --git a/packages/types/src/interfaces/runtime/definitions.ts b/packages/types/src/interfaces/runtime/definitions.ts
index 839ce89285..cc438c0d22 100644
--- a/packages/types/src/interfaces/runtime/definitions.ts
+++ b/packages/types/src/interfaces/runtime/definitions.ts
@@ -65,6 +65,7 @@ export default {
       weight: 'Weight',
       class: 'DispatchClass'
     },
+    Fixed64: 'Int<64, Fixed64>',
     H160: '[u8; 20; H160]',
     H256: '[u8; 32; H256]',
     H512: '[u8; 64; H512]',
diff --git a/packages/types/src/interfaces/runtime/types.ts b/packages/types/src/interfaces/runtime/types.ts
index 98cd0911f3..1a8cc26077 100644
--- a/packages/types/src/interfaces/runtime/types.ts
+++ b/packages/types/src/interfaces/runtime/types.ts
@@ -2,10 +2,10 @@
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
 import { ITuple } from '@polkadot/types/types';
-import { Compact, Enum, Struct, U8aFixed, Vec } from '@polkadot/types/codec';
+import { Compact, Enum, Int, Struct, U8aFixed, Vec } from '@polkadot/types/codec';
 import { GenericExtrinsic, GenericExtrinsicEra, GenericExtrinsicPayload, GenericExtrinsicPayloadUnknown, GenericExtrinsicPayloadV1, GenericExtrinsicPayloadV2, GenericExtrinsicPayloadV3, GenericExtrinsicPayloadV4, GenericExtrinsicSignatureV1, GenericExtrinsicSignatureV2, GenericExtrinsicSignatureV3, GenericExtrinsicSignatureV4, GenericExtrinsicUnknown, GenericExtrinsicV1, GenericExtrinsicV2, GenericExtrinsicV3, GenericExtrinsicV4, GenericImmortalEra, GenericMortalEra, GenericSignerPayload } from '@polkadot/types/extrinsic';
 import { GenericAccountId, GenericAccountIndex, GenericAddress, GenericBlock, GenericCall, GenericConsensusEngineId, GenericDigest, GenericOrigin } from '@polkadot/types/generic';
-import { Bytes, Fixed64, Null, StorageData, StorageKey, bool, u128, u32, u64, u8 } from '@polkadot/types/primitive';
+import { Bytes, Null, StorageData, StorageKey, bool, u128, u32, u64, u8 } from '@polkadot/types/primitive';
 import { AuthorityId } from '@polkadot/types/interfaces/consensus';
 
 /** @name AccountId */
@@ -147,6 +147,9 @@ export interface ExtrinsicV3 extends GenericExtrinsicV3 {}
 /** @name ExtrinsicV4 */
 export interface ExtrinsicV4 extends GenericExtrinsicV4 {}
 
+/** @name Fixed64 */
+export interface Fixed64 extends Int {}
+
 /** @name H160 */
 export interface H160 extends U8aFixed {}
 
diff --git a/packages/types/src/interfaces/txpayment/types.ts b/packages/types/src/interfaces/txpayment/types.ts
index 257d8e0418..4feea636dd 100644
--- a/packages/types/src/interfaces/txpayment/types.ts
+++ b/packages/types/src/interfaces/txpayment/types.ts
@@ -1,7 +1,7 @@
 // Auto-generated via `yarn polkadot-types-from-defs`, do not edit
 /* eslint-disable @typescript-eslint/no-empty-interface */
 
-import { Fixed64 } from '@polkadot/types/primitive';
+import { Fixed64 } from '@polkadot/types/interfaces/runtime';
 
 /** @name Multiplier */
 export interface Multiplier extends Fixed64 {}
diff --git a/packages/types/src/primitive/I64Fixed.ts b/packages/types/src/primitive/I64Fixed.ts
deleted file mode 100644
index 078cd83f7d..0000000000
--- a/packages/types/src/primitive/I64Fixed.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2017-2020 @polkadot/types authors & contributors
-// This software may be modified and distributed under the terms
-// of the Apache-2.0 license. See the LICENSE file for details.
-
-import I64 from './I64';
-
-/**
- * @name I64Fixed
- * @description
- * A 64-bit signed integer (Fixed64 in Rust)
- */
-export default class I64Fixed extends I64 {
-}
diff --git a/packages/types/src/primitive/index.ts b/packages/types/src/primitive/index.ts
index 254cc3260d..8ab3c73b38 100644
--- a/packages/types/src/primitive/index.ts
+++ b/packages/types/src/primitive/index.ts
@@ -17,7 +17,6 @@ export { default as i8 } from './I8';
 export { default as i16 } from './I16';
 export { default as i32 } from './I32';
 export { default as i64 } from './I64';
-export { default as Fixed64 } from './I64Fixed';
 export { default as i128 } from './I128';
 export { default as i256 } from './I256';
 export { default as Null } from './Null';