> ## Documentation Index
> Fetch the complete documentation index at: https://circle-devdocs-test-ai-codegen-component.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Release Notes - Developer Services - 2025

> 2025 release notes for Circle's Developer Services platform.

## October 2025

<Update label="2025.10.14">
  #### Documentation additions

  Created the following new topics to support Bridge Kit:

  * [Bridge Kit Overview](/bridge-kit)
  * [Adapter Setups](/bridge-kit/concepts/adapter-setups)
  * [Quickstart: Transfer USDC from Base to Ethereum](/bridge-kit/quickstarts/transfer-usdc-from-base-to-ethereum)
  * [Quickstart: Transfer USDC from Ethereum to Solana](/bridge-kit/quickstarts/transfer-usdc-from-ethereum-to-solana)
  * [Bridge Kit Installation](/bridge-kit/tutorials/installation)
  * [Collect a Transfer Fee](/bridge-kit/tutorials/collect-a-transfer-fee)
  * [Configure Transfer Speed and Max Cost](/bridge-kit/tutorials/configure-transfer-speed)
  * [Estimate Costs Before Transferring](/bridge-kit/tutorials/estimate-costs)
  * [Specify Recipient Address](/bridge-kit/tutorials/specify-recipient-address)
  * [Bridge Kit SDK Reference](/bridge-kit/references/sdk-reference)
  * [Event Handling](/bridge-kit/references/event-handling)
  * [Error Recovery and Troubleshooting](/bridge-kit/references/error-recovery-and-troubleshooting)
</Update>

<Update label="2025.10.08">
  Expanded Gateway support to include HyperEVM, Sei, Sonic, and World Chain

  ## Documentation updates

  Updated the following documentation to reflect Gateway support for HyperEVM, Sei, Sonic, and World Chain:

  * [Gateway Fees](/gateway/references/fees)
  * [Gateway Smart Contract Addresses](/gateway/references/contract-addresses)
  * [Gateway Supported Blockchains](/gateway/references/supported-blockchains)
</Update>

<Update label="2025.08.07">
  #### API updates

  Replaced the transaction state `PENDING_RISK_SCREENING` with `CLEARED`
</Update>

<Update label="2025.08.04">
  #### API additions

  Added `networkFeeRaw` to the response of the following endpoints:

  * [`POST /transactions/contractExecution/estimateFee`](/api-reference/wallets/developer-controlled-wallets/create-transaction-estimate-fee)
  * [`POST /transactions/transfer/estimateFee`](/api-reference/wallets/developer-controlled-wallets/create-transfer-estimate-fee)
  * [`POST /contracts/deploy/estimateFee`](/api-reference/contracts/smart-contract-platform/estimate-contract-deploy)
</Update>

## August 2025

<Update label="2025.08.26">
  #### API updates

  Updated the following Gateway endpoints:

  * Added `expirationBlock` to the
    [`POST /v1/transfer`](/api-reference/gateway/all/create-transfer-attestation)
    response
  * Added `processedHeight` and `burnIntentExpirationHeight` to the
    [`GET /v1/info`](/api-reference/gateway/all/get-gateway-info) response
</Update>

<Update label="2025.08.07">
  #### API updates

  Replaced the transaction state `PENDING_RISK_SCREENING` with `CLEARED`
</Update>

<Update label="2025.08.04">
  #### API additions

  Added `networkFeeRaw` to the response of the following endpoints:

  * [`POST /transactions/contractExecution/estimateFee`](/api-reference/wallets/developer-controlled-wallets/create-transaction-estimate-fee)
  * [`POST /transactions/transfer/estimateFee`](/api-reference/wallets/developer-controlled-wallets/create-transfer-estimate-fee)
  * [`POST /contracts/deploy/estimateFee`](/api-reference/contracts/smart-contract-platform/estimate-contract-deploy)
</Update>

## July 2025

<Update label="2025.07.23">
  Expanded Developer Services support for Avalanche Mainnet and Avalanche Fuji
  Testnet to include smart contract accounts (SCAs), modular wallets, and Gas
  Station sponsorship.

  #### Documentation updates

  Updated the following documentation to reflect Avalanche support:

  * [Account Types](/wallets/account-types)
  * [Blockchain Compatibility for Developer Services APIs](/w3s/blockchain-compatibility-for-circle-apis)
  * [Blockchain Confirmations](/w3s/blockchain-confirmations)
  * [Blockchain Infrastructure](/wallets/blockchain-infrastructure)
  * [Gas Fees](/wallets/gas-fees)
  * [Gas Station](/wallets/gas-station)
  * [Gas Station Contract Addresses](/wallets/gas-station/contract-addresses)
  * [Gas Station Policy Management](/wallets/gas-station/policy-management)
  * [Modular Wallets Quickstart](/wallets/modular/create-a-wallet-and-send-gasless-txn)
  * [Modular Wallets Web SDK](/wallets/modular/web-sdk)
  * [Modular Wallets iOS SDK](/wallets/modular/ios-sdk)
  * [Modular Wallets Android SDK](/wallets/modular/android-sdk)
  * [Send a Gasless Transaction](/wallets/quickstarts/send-a-gasless-transaction)
  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)

  #### API updates

  Added enum values `AVAX`, `AVAX-FUJI` to the `blockchain` request field for the
  following Circle Contracts APIs:

  * `POST /contracts/deploy`
  * `POST /contracts/deploy/estimateFee`
  * `POST /contracts/import`
  * `POST /contracts/query`
  * `POST /templates/{id}/deploy`
  * `POST /templates/{id}/deploy/estimateFee`
</Update>

<Update label="2025.07.22">
  Launched Circle Gateway on testnet.

  #### Documentation additions

  Created the following new topics to support Circle Gateway:

  * [Gateway Overview](/gateway)
  * [Gateway Technical Guide](/gateway/concepts/technical-guide)
  * [Quickstart: Create and Transfer a Unified USDC Balance](/gateway/quickstarts/unified-balance)
  * [Gateway Supported Blockchains](/gateway/references/supported-blockchains)
  * [Gateway Contract Addresses](/gateway/references/contract-addresses)
  * [Gateway Contract Interfaces and Events](/gateway/references/contract-interfaces-and-events)
  * [Gateway Fees](/gateway/references/fees)

  #### API additions

  Added the following endpoints to support Circle Gateway:

  * [`POST /v1/balances`](/api-reference/gateway/all/get-token-balances)
  * [`GET /v1/info`](/api-reference/gateway/all/get-gateway-info)
  * [`POST /v1/transfer`](/api-reference/gateway/all/create-transfer-attestation)
</Update>

<Update label="2025.07.11">
  Added an optional `delayReason` field to CCTP transfer status responses to
  provide context for delayed transfers.

  #### API updates

  The `delayReason` field is now returned in the following CCTP Iris endpoints:

  * `GET /v2/messages` - Get messages and attestations
</Update>

<Update label="2025.07.08">
  Added support for the `order` request parameter (`ASC` or `DESC`) to enable
  sorting by `createDate` for improved client-side data handling.

  #### API updates

  The `order` parameter is now supported in the following endpoints:

  * `GET /v1/w3s/walletSets` - Get all wallet sets (developer-controlled)
  * `GET /v1/w3s/transactions` - List transactions (user/developer-controlled)
  * `GET /v1/w3s/wallets` - List wallets (user/developer-controlled)
  * `GET /v1/w3s/users` - List users (user-controlled)
</Update>

## June 2025

<Update label="2025.06.25">
  Launched Developer Services support for Aptos Mainnet and Testnet.

  #### Documentation updates

  Updated the following documentation to reflect Aptos support:

  * [Account Types](/wallets/account-types)
  * [Blockchain Infrastructure](/wallets/blockchain-infrastructure)
  * [Blockchain Compatibility for Developer Services APIs](/w3s/blockchain-compatibility-for-circle-apis)
  * [Blockchain Confirmations](/w3s/blockchain-confirmations)
  * [Gas Fees](/wallets/gas-fees)
  * [Gas Station](/wallets/gas-station)
  * [Gas Station Contract Addresses](/wallets/gas-station/contract-addresses)
  * [Gas Station Policy Management](/wallets/gas-station/policy-management)
  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)
  * [Testnet Faucets](/w3s/developer-console-faucet)
  * [Receive an Inbound Transfer (User-Controlled Wallets)](/wallets/user-controlled/receive-inbound-transfer)
  * [Receive an Inbound Transfer (Developer-Controlled Wallets)](/wallets/dev-controlled/receive-an-inbound-transfer)
  * [Send a Gasless Transaction](/wallets/quickstarts/send-a-gasless-transaction)

  #### API updates

  Added enum values `APTOS`, `APTOS-TESTNET` to the `blockchain` request field for
  the following APIs:

  * `POST /developer/wallets`
  * `POST /user/wallets`
  * `GET /wallets`
  * `GET /transactions`
  * `POST /transactions/transfer`
  * `POST /transactions/transfer/estimateFee`
  * `POST /transactions/validateAddress`
  * `POST /user/initialize`
</Update>

<Update label="2025.06.17">
  Added programmatic gas price optimization to modular wallets web SDK.

  #### Documentation updates

  Updated the following documentation to reflect programmatic gas price
  optimization support in modular wallets web SDK:

  * [Modular Wallets Web SDK](/wallets/modular/web-sdk):
    * Added `GetUserOperationGasPriceReturnType` interface.
    * Added `GetUserOperationGasPriceRpcSchema` type.
    * Added `getUserOperationGasPrice` function.
</Update>

<Update label="2025.06.13">
  Removed Compliance Engine's **Travel Rule** from the developer documentation as
  it's been deprecated.
</Update>

## May 2025

<Update label="2025.05.15">
  Added support for Avalanche and Unichain to Paymaster v0.8.

  #### Documentation updates

  Updated the following documentation to reflect Avalanche and Unichain support in
  Paymaster v0.8:

  * [Paymaster Overview](/paymaster)
  * [Paymaster Addresses and Events](/paymaster/addresses-and-events)
</Update>

<Update label="2025.05.07">
  Added Paymaster v0.8 documentation.

  #### Documentation updates

  Updated the following pages to reflect support for EntryPoint v0.8 of the
  ERC-4337 contract in Paymaster:

  * [Paymaster Overview](/paymaster)
  * [Quickstart: Build a Wallet to Pay Gas Fees with USDC](/paymaster/pay-gas-fees-usdc)
  * [Paymaster Addresses and Events](/paymaster/addresses-and-events)
</Update>

## April 2025

<Update label="2025.04.17">
  Added passkey recovery support to modular wallets web SDK.

  #### Documentation additions

  Added the following documentation to support passkey recovery using the modular
  wallets web SDK:

  * [How To Set Up Passkey Recovery](/wallets/modular/recover-passkey).

  #### Documentation updates

  Updated the following documentation to support passkey recovery in modular
  wallets:

  * [Modular Wallets Web SDK](/wallets/modular/web-sdk):
    * Added `estimateExecuteRecoveryGas` function.
    * Added `estimateRegisterRecoveryAddressGas` function.
    * Added `executeRecovery` function.
    * Added `recoveryActions` function.
    * Added `registerRecoveryAddress` function.
  * [Modular Wallets Passkey](/wallets/modular/passkeys)
</Update>

<Update label="2025.04.11">
  #### Documentation updates

  Updated the following documentation to reflect the removed API and the new
  **[Derive a Wallet API](/api-reference/wallets/developer-controlled-wallets/derive-wallet)**
  endpoint:

  * [Programmable Wallet API Rate Limits](/wallets/api-rate-limits)

  #### API updates

  * Removed API for products that never officially launched. The following APIs
    were removed:

    * **Backfill a Wallet API**: `PUT /developer/wallets/:id/backfill`

  * Added content schema, description, and the X-Request-Id header to the **201**
    response for the following APIs:

    * [`POST /v1/w3s/user/initialize`](/api-reference/wallets/user-controlled-wallets/create-user-with-pin-challenge)
    * [`POST /v1/w3s/user/pin`](/api-reference/wallets/user-controlled-wallets/create-user-pin-challenge)
    * [`PUT /v1/w3s/user/pin`](/api-reference/wallets/user-controlled-wallets/update-user-pin-challenge)
    * [`POST /v1/w3s/user/pin/restore`](/api-reference/wallets/user-controlled-wallets/create-user-pin-restore-challenge)
    * [`POST /v1/w3s/user/wallets`](/api-reference/wallets/user-controlled-wallets/create-user-wallet)
    * [`POST /v1/w3s/user/transactions/{id}/accelerate`](/api-reference/wallets/user-controlled-wallets/create-user-transaction-accelerate-challenge)
    * [`POST /v1/w3s/user/transactions/{id}/cancel`](/api-reference/wallets/user-controlled-wallets/create-user-transaction-cancel-challenge)
    * [`POST /v1/w3s/user/transactions/walletUpgrade`](/api-reference/wallets/user-controlled-wallets/create-user-transaction-wallet-upgrade-challenge)

  #### API additions

  * Added the new
    **[Derive a Wallet API](/api-reference/wallets/developer-controlled-wallets/derive-wallet)**:
    `PUT /developer/wallets/:id/blockchains/:blockchain`
</Update>

<Update label="2025.04.08">
  * Launched Developer Services, including Circle Contracts, on Optimism (OP) and
    Base (BASE) blockchains.
  * Added modular wallets and Circle Contracts support on Unichain (UNI)
    blockchain.
  * Added a new tutorial in modular wallets to showcase how to add Externally
    Owned Account (EOA) signers for Circle Smart Accounts.

  #### Documentation additions

  Added the following documents:

  * [Dynamic Integration Tutorial](/wallets/modular/dynamic-integration)

  #### Documentation updates

  Added Optimism (OP) and Base (BASE) blockchains to tables of support:

  * [Account Types](/wallets/account-types)
  * [Blockchain Compatibility for Developer Services APIs](/w3s/blockchain-compatibility-for-circle-apis)
  * [Blockchain Confirmations](/w3s/blockchain-confirmations)
  * [Gas Fees](/wallets/gas-fees)
  * [Gas Station](/wallets/gas-station)
  * [Gas Station Contract Addresses](/wallets/gas-station/contract-addresses)
  * [Gas Station Policy Management](/wallets/gas-station/policy-management)
  * [Modular Wallets Android SDK](/wallets/modular/android-sdk)
  * [Modular Wallets iOS SDK](/wallets/modular/ios-sdk)
  * [Modular Wallets Quickstart](/wallets/modular/create-a-wallet-and-send-gasless-txn)
  * [Receive an Inbound Transfer (User-Controlled Wallets)](/wallets/user-controlled/receive-inbound-transfer)
  * [Receive an Inbound Transfer (Developer-Controlled Wallets)](/wallets/dev-controlled/receive-an-inbound-transfer)
  * [Send a Gasless Transaction](/wallets/quickstarts/send-a-gasless-transaction)
  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)
  * [Testnet Faucets](/w3s/developer-console-faucet)

  #### API additions

  * Added enum values `BASE`, `BASE-SEPOLIA`, `OP`, `OP-SEPOLIA` to the
    `blockchain` request field for the following APIs:

    * `POST /developer/wallets`
    * `POST /user/wallets`
    * `GET /wallets`
    * `GET /transactions`
    * `POST /transactions/contractExecution/estimateFee`
    * `POST /transactions/transfer`
    * `POST /transactions/transfer/estimateFee`
    * `POST /transactions/validateAddress`
    * `POST /user/initialize`
    * `GET /config/entity/monitoredTokens`
    * `GET /contracts`
    * `POST /contracts/deploy`
    * `POST /contracts/deploy/estimateFee`
    * `POST /contracts/import`
    * `POST /contracts/query`
    * `POST /templates/{id}/deploy`
    * `POST /templates/{id}/deploy/estimateFee`
    * `GET /contracts/monitors`
    * `POST /contracts/monitors`
    * `GET /contracts/events`

  * Added enum values `UNI` and `UNI-SEPOLIA` to the `blockchain` request field
    for the following APIs:

    * `GET /contracts`
    * `POST /contracts/deploy`
    * `POST /contracts/deploy/estimateFee`
    * `POST /contracts/import`
    * `POST /contracts/query`
    * `POST /templates/{id}/deploy`
    * `POST /templates/{id}/deploy/estimateFee`
    * `GET /contracts/monitors`
    * `POST /contracts/monitors`
    * `GET /contracts/events`
</Update>

## March 2025

<Update label="2025.03.31">
  Launched the SDK Explorer for Developer Services server-side SDKs.

  #### Documentation additions

  Added the following pages for the SDK Explorer:

  * [SDK Explorer Overview](/sdk-explorer)
  * [Getting Started with Developer-Controlled Wallets - Node.js](/sdk-explorer/developer-controlled-wallets/Node.js/getting-started)
  * [Getting Started with Developer-Controlled Wallets - Python](/sdk-explorer/developer-controlled-wallets/Python/getting-started)
  * [Getting Started with User-Controlled Wallets - Node.js](/sdk-explorer/user-controlled-wallets/Node.js/getting-started)
  * [Getting Started with User-Controlled Wallets - Python](/sdk-explorer/user-controlled-wallets/Python/getting-started)
  * [Getting Started with Contracts - Node.js](/sdk-explorer/smart-contract-platform/Node.js/getting-started)
  * [Getting Started with Contracts - Python](/sdk-explorer/smart-contract-platform/Python/getting-started)
</Update>

<Update label="2025.03.27">
  The following Circle Product Lines have been renamed:

  | Previous Product Line name | New Product Line name |
  | -------------------------- | --------------------- |
  | Web3 Services              | Developer Services    |

  The following Circle Products have been renamed:

  | Previous Product name         | New Product name |
  | ----------------------------- | ---------------- |
  | Programmable Wallets          | Circle Wallets   |
  | Smart Contract Platform (SCP) | Circle Contracts |

  These name changes are part of a broader effort to simplify and align our
  product naming, creating a more unified developer experience across the Circle
  platform.
</Update>

<Update label="2025.03.24">
  #### Documentation updates

  Updated the following document to reflect the new **Backfill a wallet** API
  endpoint:

  * [Programmable Wallet API Rate Limits](/wallets/api-rate-limits)

  #### API additions

  Added new API endpoints:

  * [`GET /v1/w3s/developer/wallets/balances`](/api-reference/wallets/developer-controlled-wallets/get-wallets-with-balances)
  * [`PUT /v1/w3s/developer/wallets/{id}/backfill`](/api-reference/wallets/developer-controlled-wallets/backfill-wallet)
</Update>

<Update label="2025.03.21">
  Removed USDC Access from the developer documentation as it's no longer available
  for new users.
</Update>

## February 2025

<Update label="2025.02.22">
  #### API updates

  * Updated description for the following APIs:

    * `POST /developer/sign/message`
    * `POST /developer/sign/typeData`
    * `POST /user/sign/message`
    * `POST /user/sign/typeData`

  #### API additions

  * Added example for `Address` and `ContractAddress`
</Update>

<Update label="2025.02.21">
  #### API updates

  * Updated `abiFunctionSignature` to be optional for the
    `POST /transactions/contractExecution/estimateFee` API.
</Update>

<Update label="2025.02.19">
  #### API additions

  * Added enum values `UNI` and `UNI-SEPOLIA` to the `chain` request field for the
    following API:

    * `POST /compliance/screening/addresses`
</Update>

<Update label="2025.02.12">
  Added EIP-1193 example for modular wallets

  #### Documentation additions

  Added a code example for EIP-1193:

  * [Key Features](/wallets/modular/key-features)
</Update>

<Update label="2025.02.11">
  Launched Web3 Services on Unichain mainnet

  #### Documentation updates

  Added Unichain mainnets to tables of support:

  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)
  * [Blockchain Compatibility for Web3 Services APIs](/w3s/blockchain-compatibility-for-circle-apis)
  * [Blockchain Confirmations](/w3s/blockchain-confirmations)
  * [Gas Fees](/wallets/gas-fees)
  * [Gas Station Contract Addresses](/wallets/gas-station/contract-addresses)
  * [Gas Station](/wallets/gas-station)
</Update>

## January 2025

<Update label="2025.01.30">
  Added information on batching user-ops with the Circle API.

  #### Documentation updates

  Updated information on batch operations:

  * [Account Types](/wallets/account-types)
  * [Batch Operations](/wallets/batch-operations)
</Update>

<Update label="2025.01.29">
  #### API additions

  * Added enum value `UNI` to the `blockchain` request field for the following
    APIs:

    * `POST /developer/wallets`
    * `POST /user/wallets`
    * `GET /wallets`
    * `GET /transactions`
    * `POST /transactions/validateAddress`
    * `POST /user/initialize`
    * `GET /config/entity/monitoredTokens`
    * `POST /developer/transactions/transfer`
    * `POST /transactions/transfer/estimateFee`
    * `POST /user/transactions/transfer`
    * `POST /user/transactions/transfer/estimateFee`
</Update>

<Update label="2025.01.25">
  Launched user-controlled wallets signing on EVM chains.

  #### Documentation updates

  Added information for signing transactions with user-controlled wallets:

  * [Confirmation UIs](/wallets/user-controlled/confirmation-uis)
  * [Signing APIs](/wallets/signing-apis)
  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)
</Update>

<Update label="2025.01.24">
  #### API updates

  * Updated the description of error code `155236`: The provided fee in request is
    invalid.
</Update>

<Update label="2025.01.17">
  Launched modular wallets.

  #### Documentation additions

  Added modular wallets content to the Wallets section of the Developer Services
  pillar:

  * [Modular Wallets Quickstart](/wallets/modular/create-a-wallet-and-send-gasless-txn)
  * [Modular Wallets SDKs](/sdk-explorer#client-side-sdks)
  * [Modular Wallets Sample App](/sample-projects)

  #### API additions

  Added modular wallets endpoints:

  * `GET buidl/transfers`
  * `GET buidl/userOps`
  * `GET buidl/wallets/balances`
  * `GET buidl/wallets/nfts`
</Update>

<Update label="2025.01.14">
  Launched Web3 Services on Unichain testnet.

  #### Documentation updates

  Added Unichain testnet to tables of support:

  * [Supported Blockchains and Currencies](/w3s/supported-blockchains-and-currencies)
  * [Blockchain Compatibility for Web3 Services APIs](/w3s/blockchain-compatibility-for-circle-apis)
  * [Blockchain Confirmations](/w3s/blockchain-confirmations)
  * [Gas Fees](/wallets/gas-fees)
  * [Gas Station Contract Addresses](/wallets/gas-station/contract-addresses)
  * [Gas Station](/wallets/gas-station)
</Update>