Ssend211h ago · 5 min readHow to invoice in EUR or SEK and get paid in EURC to your own walletDisclosure: this is written by the team behind send21. You have a client in another country who is happy to pay in stablecoins. You invoice in EUR or SEK, because that is what your books are kept in. send21.hashnode.dev
Ssend211h ago · 6 min readWhat should an AI agent do when it hits its budget?Give an agent a budget and sooner or later it reaches the edge of it. A research agent has spent 4.20 of its 5.00 USD cap, and the next step (one more paid API call, a dataset, a GPU minute) costs 1.5send21.hashnode.dev
Ssend211h ago · 8 min readLet your agent get paid without holding keysSooner or later an agent you build has to deal with money. A booking agent hits a deposit. A freelancing assistant needs to send an invoice. A support bot has to collect a fee before it ships a replacsend21.hashnode.dev
Ssend211h ago · 7 min readAddress poisoning: the copy-paste habit that cost one trader 49,999,950 USDTBy send21 (send21.io) Many crypto theft stories involve a hacked exchange or a leaked seed phrase. Address poisoning needs neither. No key is stolen and no code is exploited. The victim signs a perfecsend21.hashnode.dev
Ssend211h ago · 9 min readLet an AI agent create crypto pay links over MCP (without handing it your keys)Agents are good at preparing payments and bad places to keep money. This tutorial shows a split that works: your AI agent creates a crypto pay link over the Model Context Protocol (MCP), the payer paysend21.hashnode.dev
BBN App Guide13h ago · 3 min readHow to Check a Binance Android APK Before You Install It (2026 Checklist)Personal notes, not an official Binance page. Always follow Binance's official terms of service and the laws where you live. Sideloading an APK is normal when Google Play isn't an option on your phonebnappguide.hashnode.dev
WWalletverse2d ago · 12 min readWhat Happens Behind the Scenes When You Send Crypto?Discover what happens when you send cryptocurrency, from preparing and signing a transaction to network validation, blockchain confirmations, and the moment funds appear in the recipient's wallet. Thiwalletverseblog.hashnode.dev
CCallBrief2d ago · 2 min readCheck any token's risk on Base with one HTTP call (free demo)Before you touch a token, you want the same facts a scanner gives you: liquidity, holder concentration and contract red flags. token-risk returns all of it in one call, and the demo endpoint lets you callbrief.hashnode.dev
MMolly Sohaney3d ago · 11 min readCTF Writeup: Severed Symmetry | Crypto | CSS CTF 2026: Return of NexusDescription As the Kuiper Belt Relay reboots, your terminal intercepts an encrypted archive belonging to the Ætheric Order. Its contents survived The Severance, but the private key did not; only the mollysohaney.hashnode.dev
MMolly Sohaney3d ago · 8 min readCTF Writeup: Chrono II | Crypto | CSS CTF 2026: Return of NexusDescription We have again intercepted their talk and the cipher text, but this time it seems like its always changing. Help us! "The Time is ticking, it will never stop, no one will ever decrypt itmollysohaney.hashnode.dev
