DPT Pay vs KAST vs RedotPay: Crypto Card Fees Compared

Quick Verdict

What is a crypto U card?

A crypto U card (short for USDT card or stablecoin card) is a virtual or physical card funded by cryptocurrency — typically USDT or USDC — that works anywhere Visa or Mastercard is accepted. As crypto payments go mainstream, U-card providers have multiplied, each with different fee models, BIN regions, and benefits. For the basics of how these cards work, see What is a crypto card? This guide compares the fee structures of three prominent providers in 2026: DPT Pay, KAST, and RedotPay.

Fee comparison: DPT Pay vs KAST vs RedotPay

^† DPT Pay’s small-transaction fee (normally $0.10 on transactions of $25 USD or less) is currently waived as a limited-time promotion and may resume; confirm current pricing at DPT Pay’s fee schedule. Card issuance fees (DPT Pay: $10 virtual / $50 physical) vary by provider and card type and are not reflected in the ongoing-fee table above; check each provider’s current card pricing. Competitor fee data sourced from each provider’s official help center, last verified May 2026 — subject to change without notice; verify current rates at each provider’s official website before deciding.

Card BIN region: why it matters

The card BIN (Bank Identification Number) determines how merchants and payment processors classify your card. US-based BINs generally offer stronger compatibility with USD-denominated platforms — including AI tool subscriptions, SaaS products, and digital wallets — due to currency alignment and broad merchant acceptance.

• DPT Pay issues cards through US-based providers, a natural advantage for USD-denominated online services.
• KAST offers both US and Hong Kong BINs, assigned via routing rules, for cross-region flexibility.
• RedotPay routes cards through Singapore and Hong Kong BINs, which may suit Asia-Pacific merchants but can see more friction with some US platforms.

Annual account fee

• DPT Pay and RedotPay: $0 annual account fee.
• KAST: $0 to $10,000 per year depending on account tier (as of May 2026, per KAST’s official help center). Entry-level accounts may be free; premium tiers carry significant annual fees. Confirm your applicable tier before committing.

Transaction fee

• DPT Pay: 0% — no fee on any transaction.
• KAST: 0% — no fee on any transaction.
• RedotPay: 1% — charged on every transaction. For a hypothetical $1,000/month of spending, that is about $10/month, or roughly $120/year.

Small transaction fee

Small-transaction fees apply to micro-payments — common for subscriptions, in-app purchases, and tipping.

• DPT Pay: a $0.10 fee normally applies to transactions of $25 USD or less, but it is currently waived until further notice as a limited-time promotion. Because the waiver is temporary and may resume, confirm the current rate on the fee schedule before relying on it.
• KAST: $0 for USD transactions; $0.10 for non-USD transactions under $25 (as of May 2026, per KAST’s help center).
• RedotPay: first 5 small transactions per card per month are waived; $0.20 for each additional one (RedotPay defines a “small transaction” as ≤ $1.00 USD, as of May 2026, per its help center).

Foreign exchange (FX) fee

The FX fee applies when you spend in a currency different from your card’s base currency — relevant for travelers and international shoppers.

USD transactions: DPT Pay, KAST, and RedotPay all charge 0%. For RedotPay specifically: it previously offered both USD and HKD cards depending on your region, device, and other eligibility criteria; as of January 21, 2026, all new cards are issued as USD cards by default. Verify your card currency at signup.

Non-USD transactions (e.g. EUR, GBP, SGD, JPY) are where the differences show:

• DPT Pay: 0%–2% — the effective rate depends on the transaction currency and amount, so the floor is lower but the rate varies.
• KAST: 0.5%–1.75% — a narrower, potentially more predictable range.
• RedotPay: 1.2% — a flat rate, higher than DPT Pay’s floor but more consistent than a variable range.

If you spend across multiple currencies, compare the specific rate for your most-used currency pair across all three before deciding.

Declined transaction fee

• DPT Pay: first 3 declined transactions per card per month are free; $0.50 for each decline after that.
• KAST: $0.50 per declined transaction; its published help-center policy (as of May 2026) does not list a free-decline tier.
• RedotPay: first 3 declined transactions per card per month are free; $0.50 for each decline after that.

Card cancellation fee

• DPT Pay: free.
• KAST: free.
• RedotPay: $2.00 per card — worth factoring in if you hold or close multiple cards.

Card validity period

• DPT Pay: 6-year validity on most cards — the longest and most consistent term among the three.
• KAST: 3–6 years, depending on the card provider assigned at issuance.
• RedotPay: 3 or 5 years, also variable.

Which crypto card is right for you?

There is no single “best” card — the right choice depends on your usage. For how DPT compares against the broader field, see the best crypto cards compared.

Choose DPT Pay if you want zero transaction fees, make frequent small transactions in any currency, prefer a consistent 6-year validity, and prioritise US-BIN compatibility for AI tools, SaaS subscriptions, and ad placements.

Choose KAST if you need flexibility between US and HK BIN assignment, spend primarily in USD, and are comfortable reviewing tier-based annual fees before signing up.

Choose RedotPay if you operate primarily in Asia-Pacific where SG/HK BINs may help, have predictable low-frequency spending that absorbs the 1% transaction fee, and prefer a flat known FX rate (1.2%) over a variable range.

Frequently Asked Questions

Which crypto card has the lowest fees for frequent spenders?

DPT Pay charges 0% per transaction with no annual fee, making it the lowest total-cost option for high-frequency use. RedotPay’s 1% transaction fee adds up at volume — roughly $120/year on $1,000/month of spending.

Are crypto U cards safe to use?

Reputable providers implement standard financial security practices. Use cards from licensed and regulated providers, and enable transaction notifications. Always review each provider’s regulatory status and custody arrangements.

Can I use these cards for ChatGPT, Netflix, or SaaS subscriptions?

Yes — all three support online payments where Visa or Mastercard is accepted. US-BIN cards (like DPT Pay) often see higher acceptance for US-based subscription services.

What stablecoins can fund these cards?

Most U-card providers accept USDT and USDC as primary funding assets. Check each provider’s app for the full list of supported assets.