Keep Permit2 actions off the SDK root entry

The Permit2 actions and EIP-712 helpers import viem, which the root entry
point must not load at runtime. Their runtime exports move to
radius-sdk/client alongside the balance and ERC-20 actions; the root keeps
only the types. Add the changeset.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

Author: kylecrawshaw

.changeset/sdk-permit2.md

@@ -0,0 +1,5 @@
+---
+"radius-sdk": minor
+---
+
+Add Permit2 interactions covering both SignatureTransfer (with optional witness) and AllowanceTransfer: `approvePermit2`, `signPermit2Transfer`, `permit2TransferFrom`, `signPermit2Allowance`, `permit2Permit`, `permit2AllowanceTransferFrom`, the `permit2Actions()` client extension and the EIP-712 helpers, exported from `radius-sdk/client`.

packages/sdk/README.md

@@ -160,10 +160,10 @@ asset next to `send`.
 
 Actions for the canonical [Permit2](https://github.com/Uniswap/permit2) contract (`PERMIT2_ADDRESS`,
 the same on every Radius network), covering both of its flows. `permit2Actions()` is a client
-extension; each action is also exported on its own.
+extension; each action is also exported on its own. All of them come from `radius-sdk/client`.
 
 ```ts
-import { permit2Actions } from 'radius-sdk';
+import { permit2Actions } from 'radius-sdk/client';
 const owner = createWalletClient({ account, chain: radiusTestnet.chain, transport: http() }).extend(permit2Actions());
 const spender = createWalletClient({ account: spenderAccount, chain: radiusTestnet.chain, transport: http() }).extend(permit2Actions());
 
@@ -193,7 +193,7 @@ Nonces: SignatureTransfer nonces are random 256-bit values (`randomPermit2Nonce(
 AllowanceTransfer nonces are sequential per (owner, token, spender) and read from Permit2 when
 omitted. Deadlines default to 600 s, the same cap the x402 client applies. The EIP-712 domain,
 type sets (`PERMIT_TRANSFER_FROM_TYPES`, `PERMIT_SINGLE_TYPES`), `permit2WitnessTypeString` and
-`permit2WitnessHash` are exported for anyone assembling calls by hand; the witness type string is
+`permit2WitnessHash` are exported from `radius-sdk/client` for anyone assembling calls by hand; the witness type string is
 derived with EIP-712's ordering rule and checked against the x402 layout in the tests.
 
 ## Balances: native RUSD vs stablecoins

packages/sdk/examples/agent-buyer/permit2-pull.mjs

@@ -7,7 +7,8 @@
 //   SBC via Turnstile). The collector pays gas for the pull, so it needs a little SBC too.
 import { createWalletClient, http } from 'viem';
 import { privateKeyToAccount } from 'viem/accounts';
-import { SBC, erc20Actions, formatTokenAmount, permit2Actions, radiusActions, radiusTestnet } from 'radius-sdk';
+import { erc20Actions, formatTokenAmount, permit2Actions, radiusActions } from 'radius-sdk/client';
+import { SBC, radiusTestnet } from 'radius-sdk';
 
 const amount = process.argv[2] ?? '0.001';
 const payer = createWalletClient({ account: privateKeyToAccount(process.env.RADIUS_PRIVATE_KEY), chain: radiusTestnet.chain, transport: http() })

packages/sdk/src/client/index.ts

@@ -599,8 +599,48 @@ export type {
   GetTransfersParameters,
   WatchTransfersParameters,
 } from '../erc20.js';
-export { permit2Actions, getPermit2Approval, getPermit2Allowance, isPermit2NonceUsed, approvePermit2, signPermit2Transfer, signPermit2Allowance, permit2TransferFrom, permit2Permit, permit2AllowanceTransferFrom } from '../permit2.js';
-export type { Permit2Actions, Permit2Witness, SignedPermit2Transfer, SignedPermit2Allowance, Permit2Allowance } from '../permit2.js';
+export {
+  permit2Actions,
+  getPermit2Approval,
+  getPermit2Allowance,
+  isPermit2NonceUsed,
+  approvePermit2,
+  signPermit2Transfer,
+  signPermit2Allowance,
+  permit2TransferFrom,
+  permit2Permit,
+  permit2AllowanceTransferFrom,
+  permit2Domain,
+  permit2WitnessTypeString,
+  permit2WitnessHash,
+  permitWitnessTransferFromTypes,
+  encodeTypedDataType,
+  randomPermit2Nonce,
+  PERMIT2_ABI,
+  PERMIT_TRANSFER_FROM_TYPES,
+  PERMIT_SINGLE_TYPES,
+  TOKEN_PERMISSIONS_TYPE,
+  PERMIT2_DEFAULT_DEADLINE_SECONDS,
+} from '../permit2.js';
+export type {
+  Permit2Actions,
+  Permit2ActionsConfig,
+  Permit2Witness,
+  PermitTransferFrom,
+  PermitSingle,
+  SignedPermit2Transfer,
+  SignedPermit2Allowance,
+  Permit2Allowance,
+  GetPermit2ApprovalParameters,
+  GetPermit2AllowanceParameters,
+  IsPermit2NonceUsedParameters,
+  ApprovePermit2Parameters,
+  SignPermit2TransferParameters,
+  SignPermit2AllowanceParameters,
+  Permit2TransferFromParameters,
+  Permit2PermitParameters,
+  Permit2AllowanceTransferFromParameters,
+} from '../permit2.js';
 export { getPaymentReceipt, decodePaymentReceipt, parseUptoSettlementAmount } from '../receipt.js';
 export type { PaymentReceipt } from '../receipt.js';
 export { RadiusPaymentError } from '../errors.js';

packages/sdk/src/index.ts

@@ -54,29 +54,7 @@ export type {
   GetTransfersParameters,
   WatchTransfersParameters,
 } from './erc20.js';
-export {
-  permit2Actions,
-  getPermit2Approval,
-  getPermit2Allowance,
-  isPermit2NonceUsed,
-  approvePermit2,
-  signPermit2Transfer,
-  signPermit2Allowance,
-  permit2TransferFrom,
-  permit2Permit,
-  permit2AllowanceTransferFrom,
-  permit2Domain,
-  permit2WitnessTypeString,
-  permit2WitnessHash,
-  permitWitnessTransferFromTypes,
-  encodeTypedDataType,
-  randomPermit2Nonce,
-  PERMIT2_ABI,
-  PERMIT_TRANSFER_FROM_TYPES,
-  PERMIT_SINGLE_TYPES,
-  TOKEN_PERMISSIONS_TYPE,
-  PERMIT2_DEFAULT_DEADLINE_SECONDS,
-} from './permit2.js';
+// Permit2 actions and EIP-712 helpers load viem too; their runtime exports live on `radius-sdk/client`.
 export type {
   Permit2Actions,
   Permit2ActionsConfig,