Sales tax infrastructure for collectibles & high-value goods

Collect the right tax on every card, coin, and ounce.

Aurex calculates, collects, and files sales tax for trading cards, rare coins, and collectibles — with bullion exemptions, grading thresholds, and purity rules built in for every state. One API call at checkout. Zero spreadsheets.

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Tax calculationLive

Charizard VMAX (PSA 10)

Taxable · 8.25% Dallas, TX combined rate

$41.25

1 oz Gold American Eagle

TX bullion exemption · Tex. Tax Code §151.336

Exempt

Card sleeves & toploaders (25-pack)

Taxable · supplies

$1.98
Sales tax$43.23
Nexus alert — Texas

82% of $100,000 threshold

Classified: Graded trading card

AX-COL-CARD-GRD-PSA · 98% confidence

Built for the products generic tax engines get wrong

Pokémon & trading cardsRare & graded coinsSports memorabiliaGold & silver bullionFine artJewelry & watchesCurrency & banknotesGemstonesAntiquesPokémon & trading cardsRare & graded coinsSports memorabiliaGold & silver bullionFine artJewelry & watchesCurrency & banknotesGemstonesAntiques
Platform

Calculation to filing, one system.

Real-time calculation

The right rate, with the law attached.

POST a cart and a destination; get back per-line tax in milliseconds. Aurex resolves the full jurisdiction stack — state, county, city, district — and applies grading-tier, dollar-threshold, and bullion-purity exemptions automatically. Every result carries the statute behind it.

  • Integer-cent precision — never floats
  • Grading-tier & purity exemptions
  • Statute citations on every line
POST /v1/calculations
{
  "destination": { "city": "Dallas", "state": "TX" },
  "line_items": [
    { "sku": "CHZ-VMAX-PSA10" }
  ]
}

200 OK
{
  "tax_cents": 412500,
  "tax_code": "COL_CARD_GRADED",
  "rate": "0.0825"
}
Compliance

Every state. Every exemption. Cited.

Grading tiers, transaction-value thresholds, bullion purity floors, collectible carve-outs — the rules generic tax engines miss are the core of Aurex. Our tax content is hand-curated, backed by statute citations, and versioned so every past calculation stays auditable.

50 states + DC

Full coverage of every US taxing jurisdiction, down to district level.

24 SST member states

One Streamlined Sales Tax registration covers all member states.

A citation on every rule

Each taxability rule links to the statute or bulletin behind it.

Append-only history

Rules are versioned, never rewritten — past calculations stay defensible.

AK
ME
VT
NH
WA
ID
MT
ND
MN
IL
WI
MI
NY
RI
MA
OR
NV
WY
SD
IA
IN
OH
PA
NJ
CT
CA
UT
CO
NE
MO
KY
WV
VA
MD
DE
AZ
NM
KS
AR
TN
NC
SC
DC
OK
LA
MS
AL
GA
HI
TX
FL
Curated coverage
SST member state
No state sales tax
Built for audits

Boring where it counts.

Integer cents, always

Money is integer cents and rates are fixed-precision decimals. No float ever touches a tax amount.

An immutable ledger

Transactions are append-only. Corrections are new records, so your audit trail is complete by construction.

Conservative by default

If a state isn't curated or an address won't resolve, Aurex errors loudly. We never silently return $0 tax.

Idempotent API

Retry any request safely. Idempotency keys are honored on every write.

Sandbox mode

Test keys, test transactions, full parity. Build and verify before a single real order.

Audit-ready exports

Jurisdiction-level breakdowns, filing worksheets, and full transaction history — one click.

Integrations

Aurex works where you sell.

Drop-in plugins for the major commerce platforms, and a clean REST API for everything else. Connect your store, sync your catalog, and start collecting correctly at checkout.

WooCommerce
Shopify
BigCommerce
Adobe Commerce
Squarespace
Wix
PrestaShop
Ecwid

REST API

Stripe-grade ergonomics: predictable resources, verbose errors, test mode.

POST /v1/calculations

Selling somewhere else? We build integrations alongside our merchants — tell us what you run.

Support

Talk to people who know collectibles.

Specialists, not scripts

Our team lives in the tax law of trading cards, rare coins, and collectibles. Ask why a graded card is taxable in one state and exempt next door — you'll get the statute, not a shrug.

White-glove onboarding

We map your catalog, confirm your nexus footprint, and watch your first live calculations with you. Most merchants are collecting correctly within a week.

Stop guessing at checkout.

Get a demo and see your own products priced, classified, and taxed — correctly — in every state.

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