iHerb is a US-based health and supplements retailer billing in USD. SG users pay an FCY fee on top of the headline rate, so the calculus is different from a local merchant. A high mpd card with a low FCY fee often beats a higher-cashback card with a 3.25% FCY tax.
HSBC
8 mpd (20 RP per S$1) on Eligible Transactions for HSBC Everyday Global accountholders with ≥ S$50K balance (Mar 2026 restoration per Milelion 2026 strategy). Categories and S$1,000 cap mirror hsbc-11-bonus-1; relationship gate enforced by engine filterRatesMapByRelationship — rate is dropped when userProfile.bank_relationships doesn't include 'hsbc_ega_50k'.
Trust
Applies only to ONE category you select (locked per quarter). Requires S$2,000/mo eligible spend to unlock.
15% on user-selected preferred category at S$2,000/month min for 3 consecutive months. Quarterly cap S$250 (~S$83/cycle). Quarterly category lockup. From 1 Mar 2026: $1k/10% tier removed.
DBS
10X DBS Points per S$5 on online spend (local & overseas), capped at first S$1,000/mo of online spend. Covers online merchants — air tickets, hotels, Atome, Kris+, etc. Catalog category list reflects the actual reach so the engine matches direct category queries.
These are the objective top picks. Perqa narrows them to the cards in your wallet and tracks your spend so you always use the right one.
Try Perqa — freeiHerb prices in USD and bills the order through its US merchant account, so every SG card sees the transaction as USD. Even if iHerb offers an SGD-equivalent display price, the underlying authorisation is in USD and triggers your bank's FCY fee.
Trust and UOB EVOL both charge 0% FCY (best in market). ICBC charges 2.5%. Most banks (DBS, UOB, OCBC, Citi, HSBC, AMEX) charge 3.0%–3.25%. StanChart charges 3.5%. The fee is added to the SGD-converted amount before you see it on your statement. Fee-free multi-currency wallets — YouTrip, Wise, Revolut and the UOB FX+ debit card — also avoid it entirely.
For miles: UOB PRVI Miles (2.2 mpd × 0.015 = 3.3% effective) or DBS Altitude (2.2 mpd) both win once the FCY fee is paid. For cashback: Trust Cashback Card (15% on selected category, no FCY fee) wins if you pick the right category. For pure miles maximisation: a 4 mpd FCY card like Citi PremierMiles (4 mpd on selected FCY) can clear 5% effective.