# Introduction *CONFIDENTIAL: Please do not distribute this documentation externally without prior Anchorage Digital approval.* The Anchorage Digital REST API v2.0 provides a set of operations and resources that allow Anchorage Digital clients and partners to: - Programmatically transfer funds from an Anchorage Digital vault or wallet without human intervention - Create and list deposit addresses in a vault - Read and monitor vault balances - Query transaction history including deposits - Request quotes from and execute trades with the Anchorage Digital trading desk Want help or to share your opinion on how this API works for you? Please contact api@anchorage.com. # Authentication and Security The Anchorage Digital API performs authentication and authorization via a combination of: * An API key, which is a bearer token * A permission group signed by the user's organization, which is linked to the API key * An Ed25519 Signature, which comes from a user-generated key and is required for certain requests ## Permission Groups A permission group acts as a set of rules for how an organization and its resources can be accessed. Permission groups are created independently of API keys, and new permission groups must be created prior to making an API key. Each permission group has a name, a description and a set of permissions which can be applied to your organization's vaults. Updating, creating and deleting permissions groups require a quorum of approvals. After creation, a permission group can be freely assigned to an unlimited number of API keys. Each API key inherits its permissions from the associated permission group. When the permission group is updated, all API keys associated with it will inherit the updated permission set. If a permission group is deleted, all associated API keys will no longer work. Each organization is created with a default permission group that allows read-only access. This permission group may be modified or deleted at any time, and no API keys are created by default with this permission group. ### Permissions Possible vault permissions include the following:

Read vault activity (READ)	See an overview of your vault(s) and wallets. Read vault details, balances, asset types, transaction history and deposit addresses.
Create address (CREATE_DEPOSIT_ADDRESS)	Receive deposits in the vault from external sources. Create and read deposit addresses.
Transfer funds (TRANSFER)	This permission is configurable to enable an API key endowed with this permission to either 1) Transfer funds to any Anchorage Digital institutional account, including those outside of your organization or 2) Transfer funds to any blockchain address not custodied by Anchorage Digital that has gone through quorum approval.
Propose and accept settlements (PROPOSE_ACCEPT_SETTLEMENTS)	This is an Atlas specific permission for initiating settlements.
Authorize settlements (AUTHORIZE_SETTLEMENTS)	This is an Atlas specific permission for authorizing settlements after they've been proposed or accepted.

There are also special vault permissions for enabled by Anchorage Digital on a per-organization basis: Additionally, there are global permissions which apply to the entire organization:

Initiate withdrawals (INITIATE_WITHDRAWAL)	Initiate withdrawals to external destinations. All withdrawals require quorum approval through the Anchorage Digital mobile app.
Execute trades (TRADE)	Request for quotes (RFQ) from the Anchorage Digital trading desk. Create and accept quotes. Read data of trades and settlements created by this key.
Read trade activity (READ_TRADE)	Read trade activity and trade settlements data of your organization.
Read lending activity (LENDER_READ)	Read lending activity of your organization.
Read facility data (FACILITY_ONLY)	Read lending facility data.
Read deposit attribution activity (READ_DEPOSIT_ATTRIBUTION)	Read deposit attribution activity of your organization.
Manage deposit attributions (DEPOSIT_ATTRIBUTION)	Read deposit attribution activity of your organization. Perform deposit attributions.
Initiate Staking and Unstaking (STAKE)	Initiate staking or unstaking operation. All operations require quorum approval through the Anchorage Digital mobile app.

### Example Workflow - Allow transfers from specific vaults To create an API key with the ability to transfer funds from an Anchorage Digital vaults or wallet, a permission group must first be created with the **Transfer funds** permission for the desired source vaults. Creating this permission group requires a quorum of approvals on the Anchorage Digital iOS app. Once the creation is confirmed, any number of API keys may be created with this permission group in the Anchorage Digital Web Dashboard under the API 2.0 section. To add additional permissions to the API key, update the associated permission group through the Anchorage Digital Web Dashboard. To revoke any permissions, the individual API key may be revoked, or the permission group may be updated or deleted to remove Transfer access. ## API Keys All API requests must be made over HTTPS and must include authentication using the following scheme. ### Generating an API Key In order to make a valid API request, you must first create an API key. API keys can be created and managed in the Anchorage Digital Web Dashboard under the [API 2.0 tab](https://anchoragelogin.com/api). When you create an API key, there are 3 pieces of information you will need to remember: - API access key - Ed25519 public key (optional for read-only requests) - Ed25519 private/signing key (optional for read-only requests) You must generate an Ed25519 signing key pair and save the public portion in the Anchorage Digital Web Dashboard when creating the API access key. The signing key pair is used for added security with sensitive requests. Please note, Anchorage Digital cannot recover your API access key or private signing key if you forget them. You may generate a new access key and signing key at any time if you lose access. ### API Key Permissions Each API key is associated with a permission group. This permission group specifies the permitted actions for all associated API keys. Read more about permission groups [here](#section/Authentication-and-Security/Permission-Groups). ### Creating a request All requests must include the `Api-Access-Key` header, which contains your API access key as a string. Endpoints that require a signature must include the `Api-Signature` and `Api-Timestamp` headers. Read more about signatures [here](#section/Authentication-and-Security/Signatures). All request bodies must be valid JSON and have the content type `application/json`. ## Request Signatures Certain endpoints require an Ed25519 signature to be provided alongside the API key. These endpoints will specify the `Api-Signature` and `Api-Timestamp` headers as additional parameters. Signatures are optional unless explicitly required, but are encouraged for all requests. If a signature is provided, it will be verified. ### Signing Keys A signing key pair is generated by the user and the corresponding public key must be provided when creating an API key. When creating an API key, you will be prompted to provide an Ed25519 public key. You must use the associated Ed25519 signing key (private key) when creating signatures for requests from this API key. Please note that signing keys (Ed25519 private keys) should be stored securely by the user. The signing key should only be used to derive request signatures and should never be sent in a request. Anchorage Digital will never request you share your private key. ### Generating a Signing Key The user must securely generate an Ed25519 key pair on their own hardware and retain both the public and private portions. The Anchorage Digital API accepts a 64-character (32 bytes) hex-encoded Ed25519 public key when creating an API access key. #### Code sample (Python) *Generate a new signing key pair* ```python # https://pypi.org/project/PyNaCl/ import nacl import nacl.signing import secrets seed = secrets.token_bytes(32) # Generate a new random signing key signing_key = nacl.signing.SigningKey(seed) # Obtain the hex-encoded signing key print('Signing key:') print(signing_key.encode().hex()) # Obtain the hex-encoded verify key for the given signing key # Use this in the Anchorage Digital Web Dashboard when creating an API key print('Public key:') print(signing_key.verify_key.encode().hex()) ``` ### Signing a Request To sign a request, generate a request signature using the Ed25519 private (signing) key and provide it alongside the request in the `Api-Signature` header. To create a request signature, first concatenate the `timestamp`, `method`, `request path`, and `body` into a string. Then, create a signature of this message using the Ed25519 private key and hex-encode the output. Use this value as the `Api-Signature` header and use the `timestamp` value as the `Api-Timestamp` header. - The `method` is an uppercase HTTP method (ex. `GET`, `POST`, `DELETE`) - The `request path` should contain all query parameters (ex. `/v2/transfers?foo=bar&baz=bang`) - The `body` is a stringified HTTP request body - The `body` should be omitted if the request does not contain a body (ex. a `GET` or `DELETE` request) - The `timestamp` is the same as the `Api-Timestamp` header - The `timestamp` is a number of seconds since the Unix Epoch in UTC, and must be within one minute of the API service's time when the request is received ### Reference signature To verify your signature generation code is correct, generate a signature for the following request and timestamp using the provided signing key. If the generated signature matches the signature below, your signature generation code is correct.

Timestamp	1577880000
HTTP Method (Uppercase)	POST
HTTP Path + query	/v2/transfers?foo=bar&baz=bang
HTTP Body	{"source": {"id": "1c920f4241b78a1d483a29f3c24b6c4c", "type": "VAULT"}, "assetType": "ETH", "destination": {"id": "55e89d4a644d736b01533a2ea9b32a20", "type": "VAULT"}, "amount": "1000.00000000"}
Signing Key (Ed25519 Private Key Seed)	0101010101010101010101010101010101010101010101010101010101010101
Public Key	8a88e3dd7409f195fd52db2d3cba5d72ca6709bf1d94121bf3748801b40f6f5c
Signature	4bf42054bf7db1f8a2a2bc83d2a108502ee7a9d2ac7a2738adc2f932922446786fb9be1bd1eb475023296c6cba4ddbe28b04baca4b7521b1f1840a4ffd2b4d0d

## Reference clients ### Python (with `requests` library) *Authorize and sign requests* ```python # https://pypi.org/project/PyNaCl/ from nacl import signing import time import requests class AnchorageAuth(requests.auth.AuthBase): ACCESS_KEY_HEADER = "Api-Access-Key" SIGNATURE_HEADER = "Api-Signature" TIMESTAMP_HEADER = "Api-Timestamp" access_key: str signing_key: signing.SigningKey def __init__(self, access_key: str, signing_key_seed: bytes): self.access_key = access_key self.signing_key = signing.SigningKey(signing_key_seed) def __call__(self, r: requests.PreparedRequest): r.headers[self.ACCESS_KEY_HEADER] = self.access_key timestamp = str(int(time.time())) method = r.method.upper() if r.method else "GET" body: bytes = bytes() if r.body and isinstance(r.body, bytes): body = r.body elif r.body and isinstance(r.body, str): body = bytearray(r.body, "utf-8") message = b"".join( [bytearray(timestamp, "utf-8"), bytearray(method, "utf-8"), bytearray(r.path_url, "utf-8"), body] ) signature = self.signing_key.sign(message).signature.hex() r.headers[self.SIGNATURE_HEADER] = signature r.headers[self.TIMESTAMP_HEADER] = timestamp return r # load secrets # Use the API key generated in the Anchorage Digital Web Dashboard access_key = ... # Use the Ed25519 signing private key signing_key_str = ... # load the raw string signing_key = bytes(bytearray.fromhex(signing_key_str)) data = {} anchorage_auth = AnchorageAuth(access_key, signing_key) r = requests.post("https://api.anchorage.com/v2/transfers", data=data, auth=anchorage_auth) ``` ### Ruby - Reproduce reference signature ```ruby require "ed25519" require "net/http" require "time" def hex_to_bin(s) [s].pack('H*') end def bin_to_hex(s) s.unpack('H*').first end private_key_seed_hex = '0101010101010101010101010101010101010101010101010101010101010101' public_key_hex = '8a88e3dd7409f195fd52db2d3cba5d72ca6709bf1d94121bf3748801b40f6f5c' key_pair_hex = private_key_seed_hex + public_key_hex key_pair = hex_to_bin(key_pair_hex) signing_key = Ed25519::SigningKey.from_keypair(key_pair) timestamp = '1577880000' # Time.now.to_i.to_s req = Net::HTTP::Post.new('/v2/transfers?foo=bar&baz=bang') req.body = '{"source": {"id": "1c920f4241b78a1d483a29f3c24b6c4c", "type": "VAULT"}, "assetType": "ETH", "destination": {"id": "55e89d4a644d736b01533a2ea9b32a20", "type": VAULT"}, "amount": "1000.00000000"}' signature = signing_key.sign(timestamp + req.method + req.path + req.body) req['Api-Access-Key'] = 'YOUR_ACCESS_KEY' req['Api-Timestamp'] = timestamp req['Api-Signature'] = bin_to_hex(signature) puts bin_to_hex(signature) ``` # Errors The Anchorage Digital API returns standard HTTP error codes for each API request.

Response Code	Description
200 OK	The request was successful.
400 Bad Request	The request was improperly formed and could not be understood by the server, often due to invalid syntax, insufficient funds, or a missing required parameter.
401 Unauthorized	The request was missing a valid API key.
403 Forbidden	The provided API key does not have permission to perform the requested action.
404 Not Found	The requested resource does not exist.
409 Conflict	The requested resource cannot proceed with the requested action because it is not in the required state.
429 Too Many Requests	Too many requests have been sent in a given amount of time.
500 Internal Server Error 502 Bad Gateway 503 Service Unavailable 504 Gateway Timeout	Something went wrong on Anchorage’s side. We have been alerted and are working on it.

In addition to returning HTTP error codes for failed requests, the Anchorage Digital API includes a readable error message describing what went wrong in the response body. # Idempotency Certain endpoints support idempotent requests so that a given request can be safely retried without performing the same operation twice. For example, if a request to transfer funds does not respond due to network issues, you can retry the request using the same idempotent ID to ensure that only one transfer is created. Endpoints that support idempotent requests have an optional `idempotentId` field that can be included in the body of the `POST` request. Provide a unique string using your method of choice (such as a v4 UUID). If a request is valid, Anchorage Digital will save the request indefinitely. If a subsequent request is received with the same `idempotentId` we will return the previously saved response for that `idempotentId`. # Rate Limits Keys provisioned by an Organization share one common rate limit. API requests are limited to 20 requests per second per Organization, allowing for bursts of up to 100 requests within a single second. # Pagination Cursor pagination is used for REST endpoints which return multiple data points. Pagination allows for fetching data after the current page and specifying how many records to return. The `next` cursor is available in responses with the `page` attribute. Requests should use the `next` cursor URL to query subsequent data. Query parameter `afterId` specifies the last record previously retrieved. Some endpoints instead use the `endDate` parameter to specify the end date and older for records to retrieve. Query parameter `limit` specifies the maximum number of records in a response. ## Parameters

Parameter	Description
afterId	Request page after (older than) this pagination id.
endDate	Request records older than this date (YYYY-MM-DD format). Used for /trading/trades and /trading/settlements resources.
limit	Maximum number of results requested. Default usually 25, but varies depending on resource.

## Example `GET /v2/transfers?afterId=1968b94b09b8a1a8a381775d1f04978c424d891d50e517774bf984297985b471&limit=100` ## Next cursor The `next` cursor is a URL which references the last record in a set of records. When queried, the `next` cursor URL will return subsequent records, but otherwise using the same query parameters.

200A list of requested transactions

400Bad Request

401Unauthenticated

403Forbidden

429Too Many Requests

500Internal Server Error