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MEXC Exchange/Learn/Sarah Chen
Sarah Chen

Sarah Chen

Nationality: Australia Bio: Sarah Chen specializes in DeFi protocols, smart contracts, and Layer-2 solutions. Based in Melbourne, she brings technical expertise and clear communication to complex blockchain topics. She holds a Bachelor's degree in Computer Science from the University of Melbourne and worked as a blockchain developer for three years before transitioning to technical writing. Her hands-on experience with Ethereum, Solana, and other platforms allows her to explain intricate concepts in accessible language. Since joining MEXC Learn in 2022, Sarah has focused on making blockchain technology understandable for all users, covering topics from DeFi yield farming to zero-knowledge proofs. Areas of Expertise: - DeFi Protocols - Smart Contract Analysis - Layer-2 Solutions - Blockchain Infrastructure - Protocol Security

Recent Articles

KuCoin Fees 2026: Is Your Altcoin Trade Paying 0.30% Instead of the Advertised 0.10%?

KuCoin Fees 2026: Is Your Altcoin Trade Paying 0.30% Instead of the Advertised 0.10%?

KuCoin charges 0.10% maker and 0.10% taker on Spot Class A pairs at VIP 0, 0.20% on Class B and 0.30% on Class C, with futures at 0.02% maker and 0.06% taker. Paying fees in KCS takes 20% off spot,

2026-09-11

KuCoin KYC Requirements 2026: What Can You Still Do Unverified, and Where Can You Not Verify at All?

KuCoin KYC Requirements 2026: What Can You Still Do Unverified, and Where Can You Not Verify at All?

KuCoin announced mandatory verification for new accounts from 15 July 2023 and dates its enhanced document and face checks to 31 August 2023 on the current verification page, and the process asks for

2026-09-11

KuCoin Withdrawal Limit 2026: Your Ceiling Is Not a Number, It Is Your VIP Level

KuCoin Withdrawal Limit 2026: Your Ceiling Is Not a Number, It Is Your VIP Level

A verified individual KuCoin account has a 24 hour crypto withdrawal ceiling set by VIP level, starting at 1,000,000 USDT at VIP 0 and reaching 60,000,000 USDT at VIP 12. Unverified accounts have no

2026-09-11

Merck's KEYTRUDA Patent Cliff Explained: What 2028 Could Mean for MRK and MRKON

Merck's KEYTRUDA Patent Cliff Explained: What 2028 Could Mean for MRK and MRKON

Summary KEYTRUDA is Merck's most important drug franchise and one of the world's largest pharmaceutical products. Merck's 2025 Form 10-K lists 2028 as the U.S. compound-patent expiration for

2026-09-11

Merck and Moderna's Cancer Vaccine Explained: What the Phase 3 Breakthrough Means for MRKON

Merck and Moderna's Cancer Vaccine Explained: What the Phase 3 Breakthrough Means for MRKON

Summary Merck and Moderna announced a major Phase 3 clinical milestone on August 19, 2026. The INTerpath-001 trial evaluating intismeran autogene plus KEYTRUDA in patients with completely resected

2026-09-11

Kraken Fees Explained (2026): The 9 July 2026 Tier Change That Doubled Kraken Entry Taker Rate to 0.80%

Kraken Fees Explained (2026): The 9 July 2026 Tier Change That Doubled Kraken Entry Taker Rate to 0.80%

Kraken charges 1% plus a spread on Instant Buy, 1.5% on custom orders, 0.40% maker and 0.80% taker at Tier 1 on Kraken Pro spot, 0.02% maker and 0.05% taker on futures, and a fixed per-asset fee on

2026-09-10

Kraken KYC Explained (2026): Why Do Guides Still List Four Tiers When Kraken Page Now Shows Two Paths?

Kraken KYC Explained (2026): Why Do Guides Still List Four Tiers When Kraken Page Now Shows Two Paths?

Kraken requires identity verification before you can deposit, trade or withdraw, and a verified personal account needs a government-issued ID plus a proof of address dated within three months, with

2026-09-10

OKX Fees Explained (2026): Which of OKX Three Fee Schedules Is Your Account Secretly On?

OKX Fees Explained (2026): Which of OKX Three Fee Schedules Is Your Account Secretly On?

OKX charges Regular-tier accounts on its global schedule 0.08% maker and 0.10% taker on spot and 0.02% maker and 0.05% taker on futures, while EEA accounts without a derivatives account and all US

2026-09-10

Crypto.com Fees Explained 2026: Why Does the Same $1,000 Buy Cost $8.00 in the App and $5.00 on the Exchange?

Crypto.com Fees Explained 2026: Why Does the Same $1,000 Buy Cost $8.00 in the App and $5.00 on the Exchange?

Crypto.com runs two separate price lists. The App charges 0.80% on a cash-to-crypto purchase and up to 4% on a card buy. The Exchange charges 0.250% maker and 0.500% taker at its entry tier. Same

2026-09-10

Crypto.com Identity Verification 2026: Why Does Approval Take Up to 3 Business Days and Unlock Limits Nobody Publishes?

Crypto.com Identity Verification 2026: Why Does Approval Take Up to 3 Business Days and Unlock Limits Nobody Publishes?

Crypto.com identity verification needs your full legal name, a government-issued ID and a selfie, submitted only through the Crypto.com App. Review normally takes a few hours to a couple of business

2026-09-10

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