> ## Documentation Index > Fetch the complete documentation index at: https://docs.bolta.io/llms.txt > Use this file to discover all available pages before exploring further. # Inquire Bank Account Holder > Look up the account holder name for one account with a bank code and an account number. This API requires no issuer registration, no certificate, and no client reference id. For a virtual account with a fixed deposit amount, set `amount` to that amount. To look up several accounts at once, use the bulk inquiry API. [Bank account holder guide](/en/docs/api-introduction/bank-account-holder) ## OpenAPI ````yaml /openapi.en.yaml post /v1/bankAccountHolders:inquire openapi: 3.1.0 info: title: Bolta API description: > The Bolta e-tax invoice API. [API Overview](/en/docs/api-introduction/overview) | [Authentication guide](/en/docs/api-introduction/authentication) | [Use cases](/en/docs/api-introduction/usecase-b2b) version: 1.0.0 servers: - url: https://xapi.bolta.io description: Bolta API server security: - basicAuth: [] tags: - name: Tax Invoice Issuance description: > Issue and amend e-tax invoices. [Calculating the issuance amount](/en/docs/api-introduction/issuance-guide) | [Amendment types](/en/docs/api-introduction/amendment-guide) - name: Tax Invoice Retrieval description: > Retrieve e-tax invoice results and request processing status, and download the PDF of an issued tax invoice. [Tax invoice PDF guide](/en/docs/api-introduction/tax-invoice-pdf) - name: Reverse Issuance description: > Request and manage reverse issuance of e-tax invoices. [Email-approval reverse issuance](/en/docs/api-introduction/usecase-reverse-email) | [Simple-approval reverse issuance](/en/docs/api-introduction/usecase-reverse-simple) - name: Cash Receipt description: > Issue, cancel, and check the status of cash receipts. [Cash receipt guide](/en/docs/api-introduction/cash-receipt-guide) | [Cash receipt webhooks](/en/docs/api-introduction/webhook-cash-receipt) - name: Business Registration Status description: > Check the registration status and tax type of a business registration number. Look up one number or up to 100 numbers at once. This API requires no issuer registration and no certificate. [Business registration status guide](/en/docs/api-introduction/business-registration-status) - name: Revenue and Expense description: > Retrieve the revenue and expense tax invoices of your own business in Bolta in the order they changed, and request a collection. Responses include documents issued through Bolta and documents collected from Hometax. You need a Standard plan or higher, and the calls deduct no points. Connect Hometax in the Bolta dashboard first. [Revenue and expense guide](/en/docs/api-introduction/revenue-expense) - name: Bank Account Transactions description: > Retrieve the bank accounts and transactions connected to your own business in Bolta, and request a sync. You need a Standard plan or higher, and the calls deduct no points. Connect bank accounts in the Bolta dashboard first. [Bank account transactions guide](/en/docs/api-introduction/bank-account-transactions) - name: Bank Account Holder description: > Look up account holder names with a bank code and an account number. One path takes a single account and the other takes up to 100 accounts at once. Each account that returns a holder name deducts 50 points. [Bank account holder guide](/en/docs/api-introduction/bank-account-holder) - name: Document Issuance description: > Issue National Tax Service certificates from Hometax or a certified copy of corporate registry, and download the original PDF. Hometax documents are issued only for the business that owns the API key, and you must register a joint certificate in the Bolta dashboard. A corporate registry is issued for the corporation in `corporationNumber` and needs no joint certificate. Supported corporation types are stock company, limited company, general partnership company, limited partnership company, limited liability company, incorporated association, incorporated foundation, medical corporation, cooperative (including social cooperative), and other corporate entity (such as a patent corporation). Each document deducts 500 points for Hometax documents, 1,000 points for a corporate registry view copy, and 1,500 points for a submission copy. [Document issuance guide](/en/docs/api-introduction/document-issuance) - name: Issuer description: > Register and manage businesses that act as tax invoice issuers. Certificate requirements depend on the issuance type. [Glossary](/en/docs/api-introduction/glossary) | [Delegated issuance](/en/docs/api-introduction/usecase-delegated) | [Brokered Tax Invoice Issuance](/en/docs/api-introduction/usecase-brokered) - name: Certificate description: > Register and manage issuer certificates. [Certificate registration](/en/docs/api-introduction/certificate-registration) paths: /v1/bankAccountHolders:inquire: post: tags: - Bank Account Holder summary: Inquire Bank Account Holder description: > Look up the account holder name for one account with a bank code and an account number. This API requires no issuer registration, no certificate, and no client reference id. For a virtual account with a fixed deposit amount, set `amount` to that amount. To look up several accounts at once, use the bulk inquiry API. [Bank account holder guide](/en/docs/api-introduction/bank-account-holder) requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/BankAccountHolderInquiry' examples: Without hyphens: x-parity-id: plain summary: Account number without hyphens value: bankCode: '088' accountNumber: '1000000001' With hyphens: x-parity-id: hyphenated summary: Account number with hyphens value: bankCode: '088' accountNumber: 100-0000-001 Fixed-amount virtual account: x-parity-id: amount-verified summary: Send the deposit amount together value: bankCode: '089' accountNumber: '1000000004' amount: 20000 responses: '200': description: Lookup succeeded content: application/json: schema: $ref: '#/components/schemas/BankAccountHolderResponse' examples: Individual account: x-parity-id: individual summary: Individual holder value: bankCode: '088' accountNumber: '1000000001' holderName: 홍길동 Corporate account: x-parity-id: corporate summary: Corporate holder value: bankCode: '088' accountNumber: '1000000002' holderName: (주)볼타 headers: {} '400': description: > The bank could not verify the account, or the request is invalid. Use the response `code` to tell the causes apart. `ACCOUNT_NOT_VERIFIED`: The bank did not verify the account. `ACCOUNT_NOT_AVAILABLE`: The virtual account cannot accept deposits. `AMOUNT_REQUIRED`: The virtual account has a fixed deposit amount. Set `amount` and look it up again. `AMOUNT_MISMATCH`: The `amount` you sent differs from the amount fixed on the virtual account. `AMOUNT_VERIFICATION_UNAVAILABLE`: Bolta cannot look up this fixed-amount virtual account right now. `UNSUPPORTED_BANK`: The bank code does not support account holder lookup. `INVALID_REQUEST`: The request format is wrong, or a test key requested an account outside the fixed list. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '401': description: API key authentication failed. The response has no body. '402': description: >- The point balance is insufficient. The response `code` is `PAYMENT_REQUIRED`. Top up in the developer center. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '403': description: >- You do not have access to the requested resource. The response `code` is `FORBIDDEN`. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '409': description: >- Counting the points that in-flight requests hold, the balance is insufficient. The response `code` is `POINT_RESERVED_BY_IN_FLIGHT_REQUESTS`. Top up, or request again after the in-flight requests finish. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '429': description: >- You reached the daily lookup limit. The response `code` is `RATE_LIMITED`. Try again after `Retry-After`. headers: Retry-After: description: Seconds until you can retry schema: type: integer content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '500': description: >- Internal server error. The response `code` is `INTERNAL_SERVER_ERROR`. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' '503': description: > Bolta cannot look up the account holder right now. Use the response `code` to tell the causes apart. `BANK_UNAVAILABLE`: Bank maintenance or a connection error. Try again shortly. `LOOKUP_UNAVAILABLE`: Bolta cannot evaluate the lookup protection limit. `SERVICE_UNAVAILABLE`: A temporary internal API communication error. content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' deprecated: false components: schemas: BankAccountHolderInquiry: type: object description: An account to look up properties: bankCode: type: string pattern: ^\d{3}$ description: >- Three-digit KFTC standard bank code. See the [bank account holder guide](/en/docs/api-introduction/bank-account-holder) for supported banks. examples: - '088' accountNumber: type: string pattern: ^-*(?:\d-*){6,20}$ description: >- Account number. Hyphens are allowed. Without hyphens it must be 6 to 20 digits. examples: - '1000000001' amount: type: integer format: int64 minimum: 1 description: >- Deposit amount in KRW for a fixed-amount virtual account. Leave it empty for a regular account. required: - bankCode - accountNumber BankAccountHolderResponse: type: object description: Single account holder lookup result properties: bankCode: type: string description: The bank code you sent accountNumber: type: string description: Account number with hyphens removed holderName: type: string description: Account holder name required: - bankCode - accountNumber - holderName ErrorResponse: type: object description: The error response returned when an API request fails properties: code: type: string description: Error type identifier message: type: string description: Error description traceId: type: string description: Request trace identifier required: - code - message - traceId securitySchemes: basicAuth: type: http scheme: basic description: >- Append a colon to your API key, Base64-encode it, and put it in the header. Enter the API key as the username and leave the password empty. ````