diff --git a/packages/amino/src/index.ts b/packages/amino/src/index.ts
index 340fd598..7c576317 100644
--- a/packages/amino/src/index.ts
+++ b/packages/amino/src/index.ts
@@ -20,3 +20,4 @@ export {
 } from "./pubkeys";
 export { createMultisigThresholdPubkey } from "./multisig";
 export { decodeSignature, encodeSecp256k1Signature, StdSignature } from "./signature";
+export { AccountData, Algo, AminoMsg, AminoSignResponse, OfflineAminoSigner, StdSignDoc } from "./signer";
diff --git a/packages/amino/src/signer.ts b/packages/amino/src/signer.ts
new file mode 100644
index 00000000..fcfce60c
--- /dev/null
+++ b/packages/amino/src/signer.ts
@@ -0,0 +1,67 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+import { StdSignature } from "./signature";
+
+export interface AminoMsg {
+  readonly type: string;
+  readonly value: any;
+}
+
+interface Coin {
+  readonly denom: string;
+  readonly amount: string;
+}
+
+interface StdFee {
+  readonly amount: readonly Coin[];
+  readonly gas: string;
+}
+
+/**
+ * The document to be signed
+ *
+ * @see https://docs.cosmos.network/master/modules/auth/03_types.html#stdsigndoc
+ */
+export interface StdSignDoc {
+  readonly chain_id: string;
+  readonly account_number: string;
+  readonly sequence: string;
+  readonly fee: StdFee;
+  readonly msgs: readonly AminoMsg[];
+  readonly memo: string;
+}
+
+export type Algo = "secp256k1" | "ed25519" | "sr25519";
+
+export interface AccountData {
+  /** A printable address (typically bech32 encoded) */
+  readonly address: string;
+  readonly algo: Algo;
+  readonly pubkey: Uint8Array;
+}
+
+export interface AminoSignResponse {
+  /**
+   * The sign doc that was signed.
+   * This may be different from the input signDoc when the signer modifies it as part of the signing process.
+   */
+  readonly signed: StdSignDoc;
+  readonly signature: StdSignature;
+}
+
+export interface OfflineAminoSigner {
+  /**
+   * Get AccountData array from wallet. Rejects if not enabled.
+   */
+  readonly getAccounts: () => Promise<readonly AccountData[]>;
+
+  /**
+   * Request signature from whichever key corresponds to provided bech32-encoded address. Rejects if not enabled.
+   *
+   * The signer implementation may offer the user the ability to override parts of the signDoc. It must
+   * return the doc that was signed in the response.
+   *
+   * @param signerAddress The address of the account that should sign the transaction
+   * @param signDoc The content that should be signed
+   */
+  readonly signAmino: (signerAddress: string, signDoc: StdSignDoc) => Promise<AminoSignResponse>;
+}