XBOSS
Korean tax filings, e-invoices, and payroll data from Hometax and NHIS
Connects to Korea's Hometax system for tax certificates, VAT returns, e-invoices, business registration, and payment records. Also integrates with NHIS for social insurance filings. Requires NPKI certificate login. Supports issuing and modifying tax documents with preview-then-confirm workflow.
Try asking Muse: "Show me my VAT return history for the last year and help me apply for a tax payment certificate."
Source: Found in the official MCP Registry (kr.xdata/xdata-mcp) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 34 min ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://api.xdata.kr/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 1523ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 40
hometax__session__loginCall this FIRST before any other tool for this provider. Login to Hometax via NPKI certificate. Returns a session credential.hometax__session__user_infoRetrieve logged-in user info from Hometax.hometax__certificate__listREQUIRES prior hometax__session__login call with same account_link_id. List certificate applications already filed at Hometax (민원증명 발급 목록) with their receipt ids (cvaId, rcatNo). Read-only. Without strt_dt/end_dt only the last 3 days are returned, so an empty result does not meanhometax__certificate__apply__national_tax_paymentREQUIRES prior hometax__session__login call with same account_link_id. Apply for National Tax Payment Certificate from Hometax. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm fhometax__certificate__apply__tax_payment_recordREQUIRES prior hometax__session__login call with same account_link_id. Apply for Tax Payment Record Certificate. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm first to get a phometax__certificate__apply__vat_standardREQUIRES prior hometax__session__login call with same account_link_id. Apply for VAT Standard Certificate. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm first to get a previewhometax__certificate__apply__business_registrationREQUIRES prior hometax__session__login call with same account_link_id. Apply for Business Registration Certificate. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm first to get hometax__certificate__apply__financial_statementREQUIRES prior hometax__session__login call with same account_link_id. Apply for Standard Financial Statement Certificate. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm first hometax__certificate__apply__business_registration_reissueREQUIRES prior hometax__session__login call with same account_link_id. Apply for Business Registration Reissuance. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirm first to get ahometax__etax__invoice__search_summaryREQUIRES prior hometax__session__login call with same account_link_id. Search e-tax invoice summary (totals). Choose ONE date mode: (1) daily: set date_type='01' and start_date+end_date YYYYMMDD. (2) monthly: set date_type='02' and year+month. (3) quarterly: set date_type='03' anhometax__etax__invoice__search_listREQUIRES prior hometax__session__login call with same account_link_id. Search e-tax invoices by date range. Use from_date/to_date (YYYYMMDD or YYYY-MM-DD). prh_sls_cl_cd: '01'=issued(매출), '02'=received(매입). 국세청 rejects long ranges with '6개월이상은 조회할 수 없습니다.' — keep the window underhometax__etax__invoice__search_statisticsREQUIRES prior hometax__session__login call with same account_link_id. Search e-tax invoice monthly statistics. Use wrt_ym_strt/wrt_ym_end in YYYYMM format (e.g. 202507/202509 for July-September 2025).hometax__etax__invoice__search_detailREQUIRES prior hometax__session__login call with same account_link_id. Get detailed information for a specific e-tax invoice by its 승인번호 (etan). Get etan from hometax__etax__invoice__search_list results.hometax__etax__invoice__issueREQUIRES prior hometax__session__login call with same account_link_id. Issue an e-tax invoice to 국세청. IRREVERSIBLE: once issued the buyer is notified and it enters VAT filing; it can only be corrected by issuing a 수정세금계산서. Call without confirm first — you get a preview of exactlyhometax__etax__invoice__modifyREQUIRES prior hometax__session__login call with same account_link_id. Issue a correcting e-tax invoice (수정세금계산서) against an existing one. IRREVERSIBLE, same as issuing: call without confirm first to get a preview, show it to the user, then retry with confirm=true. You MUST ask thometax__tax__business_registration__search_statusREQUIRES prior hometax__session__login call with same account_link_id. Search business registration status by business registration number (사업자등록번호).hometax__tax__business_registration__search_infoREQUIRES prior hometax__session__login call with same account_link_id. Search detailed business registration information.hometax__tax__my_tax_agent__searchREQUIRES prior hometax__session__login call with same account_link_id. Search assigned tax agent information.hometax__tax__return_history__search_vatREQUIRES prior hometax__session__login call with same account_link_id. Search VAT return history. Use rtn_dt_srt/rtn_dt_end (YYYYMMDD). Dates before 2015-02-23 are refused ('2015년 2월 23일 이후 신고내역만 조회 가능합니다.'), and the NTS screen documents a maximum window of one year — split longehometax__tax__payment_due__search_or_payREQUIRES prior hometax__session__login call with same account_link_id. Search tax amounts due by payment deadline (납부할 세액 조회). Read-only: this tool never executes a payment; the 'or_pay' in its name is historical.hometax__tax__electronic_notice__check_statusREQUIRES prior hometax__session__login call with same account_link_id. Check electronic notice reception status.hometax__tax__refund__search_detailREQUIRES prior hometax__session__login call with same account_link_id. Search tax refund details. Use strt_dt/end_dt (YYYYMMDD). The NTS only serves the last 5 years from today.hometax__tax__unclaimed_refund__searchREQUIRES prior hometax__session__login call with same account_link_id. Search unclaimed tax refunds (최근 5년간 미수령 국세환급금). Both txpr_dscm_no and txpr_nm are required by 국세청 — the session TIN does not substitute for them.hometax__tax__notice__search_historyREQUIRES prior hometax__session__login call with same account_link_id. Search tax notice history. Use strt_dt/end_dt (YYYYMMDD). The NTS accepts start dates within the last 10 years.hometax__tax__overdue__search_historyREQUIRES prior hometax__session__login call with same account_link_id. Search overdue tax history (체납 내역). Narrow the period with strt_dt/end_dt; without them the NTS default period applies. Only 3 rows come back per page unless you raise page_size.hometax__tax__payment_statement__searchREQUIRES prior hometax__session__login call with same account_link_id. Search tax payment statement. mate_knd_cd: document type code. sbms_ym_strt/sbms_ym_end: submission year-month YYYYMM.hometax__tax__payment_statement__search_submit_historyREQUIRES prior hometax__session__login call with same account_link_id. Search tax declaration and payment submission history. Use sbms_ym_strt/sbms_ym_end (YYYYMM).hometax__tax__trade_partner__search_listREQUIRES prior hometax__session__login call with same account_link_id. Search list of trade partners (buyers/sellers) from tax records.hometax__tax__credit_card__search_sales_dataREQUIRES prior hometax__session__login call with same account_link_id. Search credit card sales data. Use bsno (business number), stl_yr (year YYYY), qrt_from/qrt_to (quarter 1-4).hometax__cash_receipt__sales__search_historyREQUIRES prior hometax__session__login call with same account_link_id. Search cash receipt sales history. from_date/to_date are required (YYYYMMDD or YYYY-MM-DD). Counts: totalCount (and the same value in pageInfoVO.totalCount) is the record count for this query and is never fewehometax__cash_receipt__sales__search_summaryREQUIRES prior hometax__session__login call with same account_link_id. Search cash receipt sales annual summary. Use cmtt_yr for the target year. Optionally specify qrt (quarter 1-4) for quarterly breakdown.hometax__cash_receipt__purchase__search_historyREQUIRES prior hometax__session__login call with same account_link_id. Search cash receipt purchase history. from_date/to_date are required (YYYYMMDD or YYYY-MM-DD). 국세청 rejects ranges longer than 3 months with '조회기간은 최대 3개월 까지 가능합니다.' — split longer periods into 3-month calls. Chometax__cash_receipt__daily_issue__searchREQUIRES prior hometax__session__login call with same account_link_id. Search cash receipt issuance records for a single day (당일 발급 조회). trs_dt is optional; omitting it means today. The adapter documents this endpoint as same-day only, so other dates are not a supported lookup. Chometax__certificate__apply_with_templateREQUIRES prior hometax__session__login call with same account_link_id. Apply for a certificate with an explicitly chosen template. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call without confirhometax__certificate__list_templatesREQUIRES prior hometax__session__login call with same account_link_id. List the certificate templates that can be applied for (9). The slugs returned here are exactly the values accepted by cert_template; nothing else is.hometax__certificate__apply_autoREQUIRES prior hometax__session__login call with same account_link_id. Apply for a certificate using the logged-in taxpayer's own details. IRREVERSIBLE: this files an application with the NTS and a receipt record (cvaId + rcatNo) is created; there is no cancel action. Call withouhometax__certificate__downloadREQUIRES prior hometax__session__login call with same account_link_id. Download an issued certificate as PDF (returned base64-encoded). Get cva_id/rcat_no from the certificate application result (hometax__certificate__apply_auto or apply_with_template).hometax__etax__business_info__getREQUIRES prior hometax__session__login call with same account_link_id. Get business info for e-tax invoice purposes.hometax__etax__client_info__getREQUIRES prior hometax__session__login call with same account_link_id. Get client/counterparty info for e-tax invoicing.nhis_edi__session__loginCall this FIRST before any other tool for this provider. Login to NHIS EDI via NPKI certificate. Returns API_KEY for chaining.Recent checks
Link
https://api.xdata.kr/mcpQuestions about XBOSS in Muse
How do I connect XBOSS to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use XBOSS to help me. It is a free service with an MCP server at https://api.xdata.kr/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is XBOSS working right now?
At the last check (September 28, 2026, 09:01 UTC) the endpoint was working, answering in 1523ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is XBOSS safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can XBOSS do in Muse?
It exposes 40 tools, including hometax__session__login, hometax__session__user_info, hometax__certificate__list, hometax__certificate__apply__national_tax_payment. For example, you could ask Muse: "Show me my VAT return history for the last year and help me apply for a tax payment certificate."
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