diff --git a/eth-rpc/client/ethcallsigs.nim b/eth-rpc/client/ethcallsigs.nim
new file mode 100644
index 0000000..75b6fbd
--- /dev/null
+++ b/eth-rpc/client/ethcallsigs.nim
@@ -0,0 +1,61 @@
+## This module contains signatures for the Ethereum client RPCs.
+import json, stint, ../ ethtypes
+
+proc web3_clientVersion(): string
+proc web3_sha3(): string
+proc net_version(): string
+proc net_peerCount(): int
+proc net_listening(): bool
+proc eth_protocolVersion(): string
+proc eth_syncing(): JsonNode
+proc eth_coinbase(): string
+proc eth_mining(): bool
+proc eth_hashrate(): int
+proc eth_gasPrice(): int64
+proc eth_accounts(): seq[array[20, byte]]
+proc eth_blockNumber(): int
+proc eth_getBalance(data: array[20, byte], quantityTag: string): int
+proc eth_getStorageAt(data: array[20, byte], quantity: int, quantityTag: string): seq[byte]
+proc eth_getTransactionCount(data: array[20, byte], quantityTag: string)
+proc eth_getBlockTransactionCountByHash(data: array[32, byte])
+proc eth_getBlockTransactionCountByNumber(quantityTag: string)
+proc eth_getUncleCountByBlockHash(data: array[32, byte])
+proc eth_getUncleCountByBlockNumber(quantityTag: string)
+proc eth_getCode(data: array[20, byte], quantityTag: string): seq[byte]
+proc eth_sign(data: array[20, byte], message: seq[byte]): seq[byte]
+proc eth_sendTransaction(obj: EthSend): UInt256
+proc eth_sendRawTransaction(data: string, quantityTag: int): UInt256
+proc eth_call(call: EthCall, quantityTag: string): UInt256
+proc eth_estimateGas(call: EthCall, quantityTag: string): UInt256
+proc eth_getBlockByHash(data: array[32, byte], fullTransactions: bool): BlockObject
+proc eth_getBlockByNumber(quantityTag: string, fullTransactions: bool): BlockObject
+proc eth_getTransactionByHash(data: Uint256): TransactionObject
+proc eth_getTransactionByBlockHashAndIndex(data: UInt256, quantity: int): TransactionObject
+proc eth_getTransactionByBlockNumberAndIndex(quantityTag: string, quantity: int): TransactionObject
+proc eth_getTransactionReceipt(data: UInt256): ReceiptObject
+proc eth_getUncleByBlockHashAndIndex(data: UInt256, quantity: int64): BlockObject
+proc eth_getUncleByBlockNumberAndIndex(quantityTag: string, quantity: int64): BlockObject
+proc eth_getCompilers(): seq[string]
+proc eth_compileLLL(): seq[byte]
+proc eth_compileSolidity(): seq[byte]
+proc eth_compileSerpent(): seq[byte]
+proc eth_newFilter(filterOptions: FilterOptions): int
+proc eth_newBlockFilter(): int
+proc eth_newPendingTransactionFilter(): int
+proc eth_uninstallFilter(filterId: int): bool
+proc eth_getFilterChanges(filterId: int): seq[LogObject]
+proc eth_getFilterLogs(filterId: int): seq[LogObject]
+proc eth_getLogs(filterOptions: FilterOptions): seq[LogObject]
+proc eth_getWork(): seq[UInt256]
+proc eth_submitWork(nonce: int64, powHash: Uint256, mixDigest: Uint256): bool
+proc eth_submitHashrate(hashRate: UInt256, id: Uint256): bool
+proc shh_post(): string
+proc shh_version(message: WhisperPost): bool
+proc shh_newIdentity(): array[60, byte]
+proc shh_hasIdentity(identity: array[60, byte]): bool
+proc shh_newGroup(): array[60, byte]
+proc shh_addToGroup(identity: array[60, byte]): bool
+proc shh_newFilter(filterOptions: FilterOptions, to: array[60, byte], topics: seq[UInt256]): int
+proc shh_uninstallFilter(id: int): bool
+proc shh_getFilterChanges(id: int): seq[WhisperMessage]
+proc shh_getMessages(id: int): seq[WhisperMessage]