> ## Documentation Index > Fetch the complete documentation index at: https://docs.archer.exchange/llms.txt > Use this file to discover all available pages before exploring further. # Get an ArcherAccount by address > The ArcherAccount at this PDA, or `null` (HTTP 200) if none exists there. ## OpenAPI ````yaml /openapi.json get /v1/account/{address} openapi: 3.0.3 info: description: >- REST API for the Archer Exchange — a high-performance Solana-based order book exchange. All monetary values (prices, sizes, fees) are returned as decimal strings for precision. ### Rate Limiting All endpoints are rate-limited via a token-bucket algorithm. When the limit is exceeded, the API returns `429 Too Many Requests`. ### Error Format All errors follow a consistent JSON format: ```json { "error": "ERROR_CODE", "message": "Human-readable description" } ``` ### Handling errors Every error falls into one of five actions. REST errors come back as `{"error": CODE, "message"}`. A transaction that fails on-chain reports `{"InstructionError": [index, {"Custom": code}]}`; codes are the `errors` list of the program IDL (`archer-sdk/idl/archer_v1.json`). When a build endpoint's preflight catches an on-chain error first, it returns `400 INVALID_PARAMS` with the reason in `message`. | Action | REST | On-chain (code) | |---|---|---| | **Retry as is**, with backoff | `RATE_LIMITED` (429), `SERVICE_UNAVAILABLE` (503), `INTERNAL_ERROR` (500); relay `OVERLOADED`, `PREFLIGHT_UNAVAILABLE`. Keep backing off on 429: 50 of them within a minute from one IP returns `BANNED` (403) for 10 minutes | none | | **Refetch, rebuild, retry**: the book or registry changed under you | | `LevelSizeMismatch` (527), `StaleSequenceNumber` (509), `SequenceNumberTooFarAhead` (522), `RegistryBooksMismatch` (525), `IncompleteMakerBooks` (513), `NoMatchingLiquidity` (507); relay status `expired` (re-sign with a fresh blockhash) | | **Reprice** | `CROSSES_SPREAD`, `SLIPPAGE_EXCEEDED` | `PostOnlyWouldCross` (524), `CrossingOrderLevels` (505), `InvalidPrice` (503), `SlippageToleranceExceeded` (703) | | **Resize** | `INSUFFICIENT_LIQUIDITY` (the body's `availableSize` is what fits) | `MakerBookSideFull` (528: cancel a level first), `InvalidSizeAtLevel` (506), `InsufficientBalance` (402) and SPL Token `1` (fund the account or shrink), `ZeroSwapAmount` (702) | | **Stop**: fix the request or the setup; retrying cannot help | `INVALID_PARAMS`, `MISSING_API_KEY` / `INVALID_API_KEY` (401), `FORBIDDEN`, `NOT_FOUND`, `MARKET_NOT_FOUND`, `METHOD_NOT_ALLOWED`; `MARKET_PAUSED` / `MARKET_FROZEN` until the market resumes | `UnauthorizedArcherAccountDelegate` (1001), `BuilderFeeExceedsAccountCap` (1003), `UnauthorizedMaker` (502), `MakerNotRegistered` (512), `PostOnlyRequiresLimitOrderBook` (526), `MarketNotActive` (107), `MarketFrozen` (114); any 200–399 code (wrong account wiring, a bug to report) | title: Archer Exchange API version: 1.0.0 servers: - description: Production url: https://api.archer.exchange - description: Staging url: https://api-staging.archer.exchange - description: Local url: http://localhost:8080 security: - apiKey: [] tags: - description: Discover and inspect available trading markets name: Markets - description: Token metadata for every mint Archer lists name: Tokens - description: Get price quotes before placing an order name: Quote - description: Build unsigned Solana transactions for swaps name: Orders - description: Build unsigned Solana transactions for limit orders name: Limit Orders - description: >- ArcherAccount — a wallet's delegated trading identity. Collateral sits in token accounts owned by the account PDA; an authorized delegate can trade and quote as the account but never withdraw. name: Account - description: Read a maker book — balances and resting levels — by PDA or by owner name: Maker Books - description: Deposit / withdraw / close — fund movement for a maker book name: Maker Funds - description: Public protocol-wide aggregate statistics name: Stats - description: >- Submit signed Solana transactions and let Archer land them. Hosted at `https://send.archer.exchange`, separate from the REST API, using the same API key. name: Transaction Relay paths: /v1/account/{address}: get: tags: - Account summary: Get an ArcherAccount by address description: >- The ArcherAccount at this PDA, or `null` (HTTP 200) if none exists there. operationId: getArcherAccountByAddress parameters: - in: path name: address required: true schema: type: string responses: '200': content: application/json: schema: allOf: - $ref: '#/components/schemas/ArcherAccountResponse' nullable: true description: The account, or `null` if it has not been created. '400': $ref: '#/components/responses/InvalidParams' '429': $ref: '#/components/responses/RateLimited' '500': $ref: '#/components/responses/InternalError' components: schemas: ArcherAccountResponse: properties: address: description: The ArcherAccount PDA. type: string delegate: description: The authorized delegate, or `null`. nullable: true type: string lamports: description: Lamports held by the account PDA (rent plus any SOL deposited). format: int64 type: integer maxBuilderFeePpm: description: Builder-fee ceiling for swaps funded by this account, ppm. type: integer owner: example: GLKCuotKSjPtQhxHmf6q8GUkw6tUZnzs8W5vEbxdaBdK type: string platform: enum: - self - treadfi type: string tokens: description: >- Every token the account holds. This is the balance a delegate funds books and swaps from, so it decides whether an order is affordable before it is built. Zero balances are omitted; the list is empty if the balance lookup was unavailable. items: $ref: '#/components/schemas/ArcherAccountTokenBalance' type: array required: - address - owner - platform - delegate - maxBuilderFeePpm - lamports - tokens type: object ArcherAccountTokenBalance: description: One token balance held by an ArcherAccount. properties: amount: description: Balance in the mint's units, decimal string. type: string atoms: description: Balance in the mint's smallest unit. type: string decimals: format: int32 type: integer mint: description: Mint address. type: string symbol: description: Symbol, when the mint is in the token registry. nullable: true type: string tokenAccount: description: The token account holding it. type: string required: - mint - amount - atoms - decimals - tokenAccount type: object ErrorResponse: properties: error: description: Machine-readable error code. enum: - INVALID_PARAMS - MARKET_NOT_FOUND - MARKET_PAUSED - INSUFFICIENT_LIQUIDITY - SLIPPAGE_EXCEEDED - NOT_FOUND - FORBIDDEN - RATE_LIMITED - INTERNAL_ERROR - SERVICE_UNAVAILABLE - MARKET_FROZEN - CROSSES_SPREAD - MISSING_API_KEY - INVALID_API_KEY - BANNED - METHOD_NOT_ALLOWED type: string message: description: Human-readable error description. type: string required: - error - message type: object responses: InvalidParams: content: application/json: example: error: INVALID_PARAMS message: 'Invalid market address: xyz' schema: $ref: '#/components/schemas/ErrorResponse' description: Invalid request parameters. RateLimited: content: application/json: example: error: RATE_LIMITED message: Too many requests. Please slow down. schema: $ref: '#/components/schemas/ErrorResponse' description: Too many requests. InternalError: content: application/json: example: error: INTERNAL_ERROR message: 'Internal error: ...' schema: $ref: '#/components/schemas/ErrorResponse' description: Internal server error. securitySchemes: apiKey: in: header name: X-API-Key type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.