₿ Blockchain & Crypto Tutorials
x402 Polygon Tutorial: Build a USDC-Paid API With HTTP 402
Learn how to build a USDC-paid Polygon API with x402, handle HTTP 402 payments, and understand when agent payment channels make sense.
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₿ Blockchain & Crypto Tutorials
Learn blockchain and cryptocurrency through practical tutorials, step-by-step guides, wallet setup, trading concepts, DeFi, Web3, security, and crypto tools.
₿ Blockchain & Crypto Tutorials
How to Build a Solana V1 Transaction With Solana Kit
Solana V1 transactions are live on mainnet with a 4,096-byte limit. Learn how to build V1 transactions, update RPC reads, and handle the new...
₿ Blockchain & Crypto Tutorials
How to Verify a Crypto Smart Contract Before Funding It
Learn how to verify a crypto smart contract before funding it, from compiling source yourself to checking deployed bytecode, privileges, add...
₿ Blockchain & Crypto Tutorials
How to Swap on Arc With Uniswap: A Step-by-Step Guide
Learn how to swap tokens on Arc using Uniswap, including wallet setup, USDC gas requirements, token checks, quote review, approvals, slippag...
₿ Blockchain & Crypto Tutorials
How to Test Ethereum Glamsterdam Devnet Fixtures
Learn how to test Ethereum Glamsterdam execution fixtures, compare client behavior, diagnose failures, and prepare applications for the upco...
₿ Blockchain & Crypto Tutorials
How to Use Trezor Clear Signing for Safer DeFi Transactions
Learn how Trezor Clear Signing uses ERC-7730 to show supported DeFi transaction details on the hardware wallet, and how to verify transactio...
₿ Blockchain & Crypto Tutorials
How to Migrate CCTP V1 to V2 Before December 2026
Circle is phasing out CCTP V1 in favor of V2. This practical migration guide covers contract changes, fees, Fast Transfer, API updates, atte...
₿ Blockchain & Crypto Tutorials
How to Test Ethereum EIP-8141 Frame Transactions
Learn how to evaluate Ethereum EIP-8141 Frame Transactions using the specification, official test fixtures, devnet evidence, cross-client ch...
₿ Blockchain & Crypto Tutorials
How to Audit an Elements Sidechain After the Liquid Bug
Learn how to audit an Elements-based sidechain after the Liquid Network incident, verify the range-proof cache fix, compare node builds, and...
₿ Blockchain & Crypto Tutorials
How to Reclaim Excess SOL After Solana’s Rent Reduction
Solana’s rent reduction can leave token accounts and mints with excess SOL. Learn how to identify eligible accounts, reclaim lamports safely...