diff --git a/packages/transaction-request-intent/src/lib/decoders/decode.ts b/packages/transaction-request-intent/src/lib/decoders/decode.ts
index fd465047e..9fce92817 100644
--- a/packages/transaction-request-intent/src/lib/decoders/decode.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/decode.ts
@@ -156,7 +156,7 @@ const decode = ({ input, config = defaultConfig }: { input: DecodeInput; config?
         payload: input.raw.rawData
       }
     default:
-      throw new Error('Invalid input type')
+      throw new DecoderError({ message: 'Invalid input type', status: 400 })
   }
 }
 
diff --git a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/ApproveAllowanceDecoder.ts b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/ApproveAllowanceDecoder.ts
index 482b0454e..aa58dd9fe 100644
--- a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/ApproveAllowanceDecoder.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/ApproveAllowanceDecoder.ts
@@ -1,4 +1,5 @@
 import { ContractCallInput, Intents } from '../../../domain'
+import { DecoderError } from '../../../error'
 import { ApproveAllowanceParams } from '../../../extraction/types'
 import { ApproveTokenAllowance } from '../../../intent.types'
 import { MethodsMapping } from '../../../supported-methods'
@@ -13,12 +14,12 @@ export const decodeApproveTokenAllowance = (
   const { from, to, chainId, data, methodId } = input
 
   if (!isSupportedMethodId(methodId)) {
-    throw new Error('Unsupported methodId')
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
   }
 
   const params = extract(supportedMethods, data, methodId) as ApproveAllowanceParams
   if (!params) {
-    throw new Error('Params do not match ERC20 transfer methodId')
+    throw new DecoderError({ message: 'Params do not match ERC20 transfer methodId', status: 400 })
   }
 
   const { amount, spender } = params
diff --git a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc1155TransferDecoder.ts b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc1155TransferDecoder.ts
index b9f0f06ec..847ec34a7 100644
--- a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc1155TransferDecoder.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc1155TransferDecoder.ts
@@ -1,6 +1,7 @@
 import { AssetType, Hex, toAccountId, toAssetId } from '@narval/authz-shared'
 import { Address } from 'viem'
 import { ContractCallInput, Intents } from '../../../domain'
+import { DecoderError } from '../../../error'
 import { Erc1155SafeTransferFromParams, SafeBatchTransferFromParams } from '../../../extraction/types'
 import { ERC1155Transfer, TransferErc1155 } from '../../../intent.types'
 import { MethodsMapping, SupportedMethodId } from '../../../supported-methods'
@@ -10,7 +11,7 @@ import { extract } from '../../utils'
 export const decodeERC1155Transfer = (input: ContractCallInput, supportedMethods: MethodsMapping): TransferErc1155 => {
   const { to: contract, from, data, chainId, methodId } = input
   if (!isSupportedMethodId(methodId)) {
-    throw new Error('Unsupported methodId')
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
   }
 
   const params = extract(supportedMethods, data, methodId)
@@ -31,8 +32,7 @@ export const decodeERC1155Transfer = (input: ContractCallInput, supportedMethods
 
     return constructTransferErc1155Intent({ to, from, contract, transfers, chainId })
   }
-
-  throw new Error('Params do not match ERC1155 transfer methodId')
+  throw new DecoderError({ message: 'Params do not match ERC1155 transfer methodId', status: 400 })
 }
 
 function createERC1155Transfer({
diff --git a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc20TransferDecoder.ts b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc20TransferDecoder.ts
index 5d341f643..9abb345d6 100644
--- a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc20TransferDecoder.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc20TransferDecoder.ts
@@ -1,4 +1,5 @@
 import { ContractCallInput, Intents } from '../../../domain'
+import { DecoderError } from '../../../error'
 import { TransferParams } from '../../../extraction/types'
 import { TransferErc20 } from '../../../intent.types'
 import { MethodsMapping } from '../../../supported-methods'
@@ -9,7 +10,7 @@ import { extract } from '../../utils'
 export const decodeErc20Transfer = (input: ContractCallInput, supportedMethods: MethodsMapping): TransferErc20 => {
   const { from, to, chainId, data, methodId } = input
   if (!isSupportedMethodId(methodId)) {
-    throw new Error('Unsupported methodId')
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
   }
 
   const params = extract(supportedMethods, data, methodId) as TransferParams
diff --git a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc721TransferDecoder.ts b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc721TransferDecoder.ts
index fb1f62ed9..fa43c756b 100644
--- a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc721TransferDecoder.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/Erc721TransferDecoder.ts
@@ -1,5 +1,6 @@
 import { AssetType } from '@narval/authz-shared'
 import { ContractCallInput, Intents } from '../../../domain'
+import { DecoderError } from '../../../error'
 import { Erc721SafeTransferFromParams } from '../../../extraction/types'
 import { TransferErc721 } from '../../../intent.types'
 import { MethodsMapping } from '../../../supported-methods'
@@ -10,7 +11,7 @@ import { extract } from '../../utils'
 export const decodeErc721Transfer = (input: ContractCallInput, supportedMethods: MethodsMapping): TransferErc721 => {
   const { to: contract, from, chainId, data, methodId } = input
   if (!isSupportedMethodId(methodId)) {
-    throw new Error('Unsupported methodId')
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
   }
 
   const params = extract(supportedMethods, data, methodId) as Erc721SafeTransferFromParams
diff --git a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/UserOperationDecoder.ts b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/UserOperationDecoder.ts
index e44419050..eecdd6e39 100644
--- a/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/UserOperationDecoder.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/transaction/interaction/UserOperationDecoder.ts
@@ -1,6 +1,7 @@
 import { Address } from '@narval/authz-shared'
 import { Hex, toHex } from 'viem'
 import { ContractCallInput, InputType, Intents } from '../../../domain'
+import { DecoderError } from '../../../error'
 import { ExecuteAndRevertParams, ExecuteParams, HandleOpsParams } from '../../../extraction/types'
 import { Intent, UserOperation } from '../../../intent.types'
 import { MethodsMapping, SupportedMethodId } from '../../../supported-methods'
@@ -69,7 +70,7 @@ const decodeExecuteAndRevert = (
 export const decodeUserOperation = (input: ContractCallInput, supportedMethods: MethodsMapping): UserOperation => {
   const { from, chainId, data, to, methodId } = input
   if (!isSupportedMethodId(methodId)) {
-    throw new Error('Unsupported methodId')
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
   }
 
   const params = extract(supportedMethods, data, methodId) as HandleOpsParams
diff --git a/packages/transaction-request-intent/src/lib/decoders/utils.ts b/packages/transaction-request-intent/src/lib/decoders/utils.ts
index 3350914f6..200cb7eff 100644
--- a/packages/transaction-request-intent/src/lib/decoders/utils.ts
+++ b/packages/transaction-request-intent/src/lib/decoders/utils.ts
@@ -1,10 +1,13 @@
 import { Hex, decodeAbiParameters } from 'viem'
+import { DecoderError } from '../error'
 import { ExtractedParams } from '../extraction/types'
 import { MethodsMapping, SupportedMethodId } from '../supported-methods'
 
 export const getMethod = (supportedMethods: MethodsMapping, methodId: SupportedMethodId) => {
   const method = supportedMethods[methodId]
-  if (!method) throw new Error('Unsupported methodId')
+  if (!method) {
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
+  }
   return method
 }
 
@@ -14,6 +17,6 @@ export const extract = (supportedMethods: MethodsMapping, data: Hex, methodId: S
     const params = decodeAbiParameters(method.abi, data)
     return method.transformer(params)
   } catch (error) {
-    throw new Error(`Failed to decode abi parameters: ${error}`)
+    throw new DecoderError({ message: 'Failed to decode abi parameters', status: 400, context: { error } })
   }
 }
diff --git a/packages/transaction-request-intent/src/lib/extraction/transformers.ts b/packages/transaction-request-intent/src/lib/extraction/transformers.ts
index c5c647858..9ba089c13 100644
--- a/packages/transaction-request-intent/src/lib/extraction/transformers.ts
+++ b/packages/transaction-request-intent/src/lib/extraction/transformers.ts
@@ -1,3 +1,4 @@
+import { DecoderError } from '../error'
 import { assertAddress, assertArray, assertBigInt, assertHexString, assertLowerHexString } from '../typeguards'
 import {
   ApproveAllowanceParams,
@@ -83,7 +84,7 @@ export const ExecuteAndRevertParamsTransform = (params: unknown[]): ExecuteAndRe
 
 export const transformUserOperation = (op: unknown[]): UserOp => {
   if (typeof op !== 'object' || op === null) {
-    throw new Error('UserOperation is not an object')
+    throw new DecoderError({ message: 'UserOperation is not an object', status: 400 })
   }
 
   return {
@@ -103,7 +104,7 @@ export const transformUserOperation = (op: unknown[]): UserOp => {
 
 export const HandleOpsParamsTransform = (params: unknown[]): HandleOpsParams => {
   if (!Array.isArray(params[0]) || typeof params[1] !== 'string') {
-    throw new Error('Invalid input format')
+    throw new DecoderError({ message: 'Invalid input format', status: 400 })
   }
   return {
     userOps: params[0].map(transformUserOperation),
diff --git a/packages/transaction-request-intent/src/lib/typeguards.ts b/packages/transaction-request-intent/src/lib/typeguards.ts
index 412e38460..bc1b28752 100644
--- a/packages/transaction-request-intent/src/lib/typeguards.ts
+++ b/packages/transaction-request-intent/src/lib/typeguards.ts
@@ -2,6 +2,7 @@ import { Address, AssetType, Hex } from '@narval/authz-shared'
 // eslint-disable-next-line no-restricted-imports
 import { isAddress } from 'viem'
 import { AssetTypeAndUnknown, Misc, Permit2Message, PermitMessage } from './domain'
+import { DecoderError } from './error'
 import { SupportedMethodId } from './supported-methods'
 
 export const isString = (value: unknown): value is string => {
@@ -16,7 +17,7 @@ export const assertBigInt = (value: unknown): bigint => {
   if (isBigInt(value)) {
     return value
   }
-  throw new Error('Value is not a bigint')
+  throw new DecoderError({ message: 'Value is not a bigint', status: 400 })
 }
 
 export function isHexString(value: unknown): value is Hex {
@@ -27,7 +28,7 @@ export const assertHexString = (value: unknown): Hex => {
   if (isHexString(value)) {
     return value
   }
-  throw new Error('Value is not a hex string')
+  throw new DecoderError({ message: 'Value is not a hex string', status: 400 })
 }
 
 export const assertLowerHexString = (value: unknown): Hex => {
@@ -38,7 +39,7 @@ export function assertString(value: unknown): string {
   if (isString(value)) {
     return value
   }
-  throw new Error('Value is not a string')
+  throw new DecoderError({ message: 'Value is not a string', status: 400 })
 }
 
 // Checks if a value is a number
@@ -50,7 +51,7 @@ export const assertNumber = (value: unknown): number => {
   if (isNumber(value)) {
     return value
   }
-  throw new Error('Value is not a number')
+  throw new DecoderError({ message: 'Value is not a number', status: 400 })
 }
 
 // Checks if a value is a boolean
@@ -62,7 +63,7 @@ export const assertBoolean = (value: unknown): boolean => {
   if (isBoolean(value)) {
     return value
   }
-  throw new Error('Value is not a boolean')
+  throw new DecoderError({ message: 'Value is not a boolean', status: 400 })
 }
 
 // Checks if a value is an array
@@ -76,7 +77,7 @@ export const isSupportedMethodId = (value: Hex): value is SupportedMethodId => {
 
 export const assertAddress = (value: unknown): Address => {
   if (!isString(value) || !isAddress(value)) {
-    throw new Error('Value is not an address')
+    throw new DecoderError({ message: 'Value is not an address', status: 400 })
   }
   return value.toLowerCase() as Address
 }
@@ -92,7 +93,7 @@ export const isAssetType = (value: unknown): value is AssetTypeAndUnknown => {
 
 export const assertArray = <T>(value: unknown, type: AssertType): T[] => {
   if (!Array.isArray(value)) {
-    throw new Error('Value is not an array')
+    throw new DecoderError({ message: 'Value is not an array', status: 400 })
   }
   switch (type) {
     case 'string': {
diff --git a/packages/transaction-request-intent/src/lib/utils.ts b/packages/transaction-request-intent/src/lib/utils.ts
index 1e7cd1bd6..8f714942e 100644
--- a/packages/transaction-request-intent/src/lib/utils.ts
+++ b/packages/transaction-request-intent/src/lib/utils.ts
@@ -63,7 +63,7 @@ export const buildContractRegistryEntry = ({
 }): { [key: AccountId]: AssetTypeAndUnknown } => {
   const registry: { [key: AccountId]: AssetTypeAndUnknown } = {}
   if (!isAddress(contractAddress) || !isAssetType(assetType)) {
-    throw new Error('Invalid contract registry entry')
+    throw new DecoderError({ message: 'Invalid contract registry entry', status: 400 })
   }
   const key = buildContractKey(chainId, contractAddress as Address)
   registry[key] = assetType
@@ -79,7 +79,11 @@ export const buildContractRegistry = (input: ContractRegistryInput): ContractReg
     }
     if (isString(contract)) {
       if (!isAccountId(contract)) {
-        throw new Error(`Contract registry key is not a valid Caip10: ${contract}`)
+        throw new DecoderError({
+          message: 'Contract registry key is not a valid Caip10',
+          status: 400,
+          context: { contract, input }
+        })
       }
       registry.set(contract.toLowerCase(), information)
     } else {
@@ -99,10 +103,18 @@ export const buildContractKey = (
 export const checkContractRegistry = (registry: Record<string, string>) => {
   Object.keys(registry).forEach((key) => {
     if (!isAccountId(key)) {
-      throw new Error(`Invalid contract registry key: ${key}: ${registry[key]}`)
+      throw new DecoderError({
+        message: 'Invalid contract registry key',
+        status: 400,
+        context: { key, value: registry[key] }
+      })
     }
     if (!isAssetType(registry[key])) {
-      throw new Error(`Invalid contract registry value: ${key}: ${registry[key]}`)
+      throw new DecoderError({
+        message: 'Invalid contract registry value',
+        status: 400,
+        context: { key, value: registry[key] }
+      })
     }
   })
   return true
@@ -122,7 +134,9 @@ export const contractTypeLookup = (
 }
 
 export const buildTransactionKey = (txRequest: TransactionRequest): TransactionKey => {
-  if (!txRequest.nonce) throw new Error('nonce needed to build transaction key')
+  if (!txRequest.nonce) {
+    throw new DecoderError({ message: 'nonce needed to build transaction key', status: 400 })
+  }
   const account = toAccountId({
     chainId: txRequest.chainId,
     address: txRequest.from,
@@ -152,7 +166,7 @@ export const decodeTypedData = (typedData: TypedData): SignTypedData => ({
 
 export const decodeMessage = (message: MessageInput): SignMessage => {
   if (!message.payload.startsWith(presignMessagePrefix)) {
-    throw new Error('Invalid message prefix')
+    throw new DecoderError({ message: 'Invalid message prefix', status: 400 })
   }
   return {
     type: Intents.SIGN_MESSAGE,
@@ -316,6 +330,8 @@ export const nativeCaip19 = (chainId: number): AssetId => {
 
 export const getMethod = (methodId: SupportedMethodId, supportedMethods: MethodsMapping) => {
   const method = supportedMethods[methodId]
-  if (!method) throw new Error('Unsupported methodId')
+  if (!method) {
+    throw new DecoderError({ message: 'Unsupported methodId', status: 400 })
+  }
   return method
 }