North American government reference data: tax rates, VAT, minimum wage, holidays, FX and settlement cycles.
Connects to official government data for USA, Canada and 8 other North American countries. Muse can look up current tax brackets, VAT rates, minimum wages, public holidays, working-day counts, employment costs and settlement dates for financial and payroll compliance.
Try asking Muse: "Check if a salary offer meets the minimum wage requirement in Quebec."
Source: Found in the official MCP Registry (dev.usaref/reference-data) · First listed September 24, 2026
Each bar is one check, every 15 minutes. Green means it answered. Last checked 5 h ago.
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.
musedirectory.ai is not part of Meta. More about how Muse handles your information
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://usaref.dev/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
usaref reference-data is a remote MCP server, so any assistant that can add a custom connector by link can use it. Same link, same tools.
In ChatGPT, open Settings, then Connectors (called Apps & Connectors on some accounts).
Under Advanced settings, switch on Developer mode. That is what lets you add a connector by link.
Choose Create, give it a name, paste the link as the MCP server URL, and save. If it needs a sign-in, ChatGPT asks for it here.
Start a chat, open the tools menu, pick the connector, and ask. ChatGPT asks before it runs a tool the first time.
Custom connectors need a paid ChatGPT plan, and on Team, Enterprise and Edu accounts only an admin can add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in ChatGPT
In Claude, open Settings, then Connectors.
Choose Add custom connector, give it a name, and paste the link.
If it needs a sign-in, Claude sends you to it. Then turn the connector on in a chat from the tools menu and ask.
Custom connectors are available on paid Claude plans; on Team and Enterprise accounts an admin may need to add them. Our "Working" label means the server answered us; it cannot tell whether your plan lets you add it. All connectors that work in Claude
https://usaref.dev/mcpResponse time at the last check: 892ms. Worked in 98.2% of checks over 30 days.
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.
list_seriesFREE. Catalog of all usaref reference-data series: supported countries, series ids, descriptions, freshness metadata and per-series URLs. Call this first to discover what data exists. Paid answer tools accept receipt=true (included in the answer price, no extra USDC) and, on a paget_public_holidaysFREE. Official public-holiday calendar for a supported country, including gazetted movable holidays, with the official government source cited. Some countries also carry sub-national calendars (e.g. the German Laender): the `subdivisions` field lists them, and passing `subdivisioget_public_holidays_worldwideFREE with any API key, including the free key by email (https://usaref.dev/free-key). Same as get_public_holidays, but for every country across all seven brands, not only North American. Unmetered: never counts against the key's allowance. Pass api_key, or send the key as the X-Aget_key_balanceFREE. Remaining allowance for an API key (free, card or metered): plan, quota, used, remaining, reset date and what the key covers. Never metered. Pass api_key, or send the key as the X-API-Key header on /mcp.is_business_dayFREE, unmetered. Is this date a business day in this country? Returns is_business_day, the reason (weekend, public_holiday, makeup_workday…), the holiday names, and the next and previous business day. Uses the country's national public-holiday calendar and its statutory weekend radd_business_daysFREE, unmetered. The date n business days after (or, for negative n, before) a start date. The start date is day 0 and never counted; n = 0 returns the date itself if it is a business day, otherwise the next one. Lists every non-business day skipped and why. Uses the country's nabusiness_days_betweenFREE, unmetered. Business days between two dates. business_days counts (from, to] and is negative when to is before from, so add_business_days(from, business_days) lands on to whenever to is a business day; business_days_inclusive counts both ends. Also returns weekend days and tget_seriesPAID ($0.003). Current value of a reference series — e.g. series=policy-rate, vat, minimum-wage. Every value carries its official source citation, effective date, last-confirmed date and staleness flag. Pass api_key if you have one (instant card checkout at /pricing); otherwise tget_series_historyPAID ($0.003). Historical values of a reference series with effective date ranges, optionally filtered by from/to (YYYY-MM-DD). Pass api_key if you have one (instant card checkout at /pricing); otherwise the response explains how to pay via x402. Every US series is free to try. Aget_filing_deadlinesPAID ($0.003, same as any series). Recurring statutory tax deadlines for a country — VAT/GST returns and payments, PAYE/payroll withholding remittances, corporate income tax returns and provisional/instalment payments — as RULES, each cited to the official source with the verbaticheck_minimum_wagePAID ($0.02). Compliance verdict: is a salary at, above or below the country's statutory minimum wage? Returns verdict, margin, the statutory floor and the legal instrument it rests on. Honest statuses when no enforceable floor exists or the period doesn't match the floor's periocompute_vatPAID ($0.01). VAT breakdown for an amount: net, tax and gross using the country's current statutory rate, including per-levy components where the rate is composite (e.g. Ghana VAT + NHIL + GETFund). mode=add treats the amount as net; mode=extract backs VAT out of a gross amount. count_working_daysPAID ($0.002). Working days in a date range for a country: weekends (Egypt's Fri–Sat handled) and statutory public holidays applied, with the holidays hit by name and the next working day after the range. Range max 366 days. Pass api_key if you have one (instant card checkout at settlement_datePAID ($0.02). Settlement/value date: the date n business days after a trade date, computed on the INTERSECTION of the calendars you name, with a per-day trail showing every skipped day and why, on which calendar. Supply business_days for a cycle you are trading under, or market +compute_income_taxPAID ($0.02). Statutory income tax on a TAXABLE-income figure using the country's verified marginal bracket schedule, with full per-bracket workings, effective rate and marginal rate. You pass the amount in local currency. IMPORTANT: this is tax on taxable income, NOT net take-hocompute_statutory_interestPAID ($0.02). Simple statutory interest on a principal at the cited statutory-interest series rate: Actual/365 simple, principal × (rate/100) × (days/365). Pass days, or from and to as YYYY-MM-DD (from inclusive, to exclusive). If both are sent and disagree, the call is refused fcompute_employment_costPAID ($0.05). Cost to employ: prices every statutory contribution on both the employee and employer sides for a gross salary, returning line-by-line amounts with instrument citations and an explicit refused list for schemes that could not be priced (unknown, not zero). Does NOT ccost_hirePAID ($0.50). Cost this hire: one cited dossier for a salary - wage-floor verdict, employer and employee contributions (or PAYE net pay for NG/KE), employer cost, optional income tax on taxable_income and first working day on or after start_date. Countries here: CA, MX, US. Anythcharge_salePAID ($0.50). Charge this sale: should this invoice carry VAT, which country's and how much - place of supply under the EU, UK and South Africa rules, net/VAT/gross, registration threshold, rule cited. Omit buyer_country for single-country rate maths. Anything we cannot answer incharge_sale_certifiedPAID ($0.75). The charge_sale dossier plus an Ed25519-signed certified extract of the governing VAT rate, for a filing. Refused free when the governing source cannot be certified right now. Anything we cannot answer in full is refused free (coverage_gap, no_charge). Shares the 3 invoice_payablePAID ($0.40). Is this invoice overdue, by how many days, and how much statutory late-payment interest is owed (Actual/365 simple, rate and workings cited). Late-payment regime: none here; statutory interest only: BS, CA, CR, HN, MX, PA, SV, US. Send due_date, or invoice_date withinvoice_checkPAID ($0.60). Check an invoice in one call: is the VAT right (place of supply, rate, expected amount vs vat_charged), is it overdue and how much statutory late interest is owed, and do seller/buyer tax IDs pass the official format check. Seller countries here: BS, CA, CR, HN, MX,evidence_packPAID ($0.25). Country evidence pack: the full cited country brief plus up to 3 Ed25519-signed certified extracts (default the first certifiable of vat, policy-rate, minimum-wage). Named series must all be certifiable. Anything we cannot answer in full is refused free (coverage_gahire_comparePAID ($0.75 for 2 countries, $1.00 for 3-5). Employer cost, employer and employee contributions, on-cost percent and wage-floor verdict side by side and ranked, every figure cited. Countries (any brand): AE, AU, CA, DE, ES, GB, IT, MX, PL, US. Gross is in each country's own currenext_filingsPAID ($0.35). Upcoming VAT, PAYE and corporate-tax due dates in a window (default the next 90 days), rolled for weekends and national public holidays, each rule cited. Countries with verified rules here: CA, DO, US. Anything we cannot answer in full is refused free (coverage_gap,verify_answer_receiptFREE. Verify an answer receipt (kind answer_receipt) with the Ed25519 public key only. Pass the receipt object or its canonical JSON, signature_value when the signature is not inside the receipt, and public_key_pem to verify offline. If public_key_pem is omitted, the tool may GETget_snapshotPAID ($0.02). Snapshot of every series for every country in one call. Pass api_key if you have one (instant card checkout at /pricing); otherwise the response explains how to pay via x402. Every US series is free to try. After a 200, bind get_changes (free poll) or register_alertget_country_briefPAID ($0.01). Country brief: every reference series we hold for one country (policy rate, VAT/GST, CPI, taxes, minimum wage, holidays...) in one call, each with value, unit, effective and last-confirmed dates, official source and confidence label. Cheaper than buying the series ocompare_seriesPAID ($0.02). One series (e.g. vat, policy-rate, minimum-wage, corporate-tax) across up to 10 countries of this brand in one call; each row carries its own source, dates and labels, and countries without the series are listed under missing. Malformed requests are refused free. Pavalidate_tax_idPAID ($0.003). Offline format and check-digit validation of a business tax ID or VAT number for one country of this brand: valid/invalid, normalised form, id type, check level (checksum only where the authority publishes the algorithm) and why it failed, with official sources. Doget_changesFREE unmetered change + freshness feed. After any paid series or answer call, call this before you assume the cached value is still the law. Returns every series whose current value took effect on or after `since` (default last 30 days), newest first, each with last_confirmed andget_calendarFREE, unmetered. GET /v1/calendar for this brand's continent. Optional country (ISO 3166-1 alpha-2) and series. Derives reverify_by from last_confirmed + update_cycle_days (the same window that sets stale) and, only when current.effective_to is a non-empty string, next_effective_register_alertBind a webhook so the next gazette does not silently stale a value you already paid for. REGISTERING IS FREE. Register: $0 · Delivery after trial: $0.05. First 3 deliveries are free; later deliveries are $0.05 and refunded if the webhook fails to send. HMAC-SHA256 signed. Two wathttps://usaref.dev/mcpNot in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use usaref reference-data to help me. It is a free service with an MCP server at https://usaref.dev/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.
At the last check (November 13, 2026, 09:30 UTC) the endpoint was working, answering in 892ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
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.
It exposes 33 tools, including list_series, get_public_holidays, get_public_holidays_worldwide, get_key_balance. For example, you could ask Muse: "Check if a salary offer meets the minimum wage requirement in Quebec."
This listing was added from public sources (Found in the official MCP Registry (dev.usaref/reference-data)). If you build usaref reference-data, claim it to correct the details and get your badge.
Paste this on your site or README. It always shows the latest check.
<a href="https://musedirectory.ai/connector/usaref-reference-data"><img src="https://musedirectory.ai/badge/usaref-reference-data.svg" alt="usaref reference-data on musedirectory.ai" width="236" height="40"></a>