# Token Primer > Crypto concepts, practical guides and explainers. Canonical: https://tokenprimer.com/ ## education news - [Guide: Read an address label without treating it as an endorsement](https://tokenprimer.com/news/f3934e98-3e6c-49a4-9685-f7b46ac041e2) — 2026-10-15T18:45:19.024Z A Kleros Scout example keeps chain and contract identity, registry state and relay provenance separate from claims about safety. [Read as Markdown](https://tokenprimer.com/news/f3934e98-3e6c-49a4-9685-f7b46ac041e2/index.md) - [x402 Explained: What an Agent Needs to Pay for an API Call](https://tokenprimer.com/news/e0c363ea-7a53-495e-bd9c-73876c037961) — 2026-10-07T13:57:49.568Z A practical guide to payment requirements, wallet authorization and spending limits, with AirnodeHub’s current free access and documented V1 payment flow kept distinct. [Read as Markdown](https://tokenprimer.com/news/e0c363ea-7a53-495e-bd9c-73876c037961/index.md) - [FinCEN withdraws wallet and mixing proposals: what the decision changes](https://tokenprimer.com/news/4fbb5063-9cad-4b39-9cda-06a1a9ef7b94) — 2026-10-05T18:33:55.888Z The October 5 action ends two proposed rulemaking measures without announcing a general exemption from financial crime controls. [Read as Markdown](https://tokenprimer.com/news/4fbb5063-9cad-4b39-9cda-06a1a9ef7b94/index.md) - [Coin Metrics rebuilds ETH flows: why historical exchange charts can change](https://tokenprimer.com/news/fc644aa6-d516-405d-91f9-9a985883cbe9) — 2026-10-05T00:35:30.771Z An October 1 recalculation highlights the difference between revised historical exchange data and information available when a trading decision was made. [Read as Markdown](https://tokenprimer.com/news/fc644aa6-d516-405d-91f9-9a985883cbe9/index.md) - [AirnodeHub test cuts a signed market response from 1,244 to 352 bytes](https://tokenprimer.com/news/69415bee-fdb6-43f5-9555-27d4ed5c0223) — 2026-10-04T15:11:54.276Z An October 4 live comparison shows how selecting two fields reduces response size while preserving request binding, with clear limits on what the signature proves. [Read as Markdown](https://tokenprimer.com/news/69415bee-fdb6-43f5-9555-27d4ed5c0223/index.md) - [SEC clears 3x Bitcoin and Ether listings: what the daily target means](https://tokenprimer.com/news/9b8eb4dc-f877-4259-9146-1b27b0bdf8be) — 2026-10-03T12:34:27.068Z The October 2 exchange rule approval covers daily leveraged products, whose longer-term returns can diverge sharply from a simple three-times calculation. [Read as Markdown](https://tokenprimer.com/news/9b8eb4dc-f877-4259-9146-1b27b0bdf8be/index.md) - [BitMart's proposed recovery tokens are not immediate repayments](https://tokenprimer.com/news/2f333d51-c3ac-4bc7-bcd2-6cb5206c1f7d) — 2026-10-02T00:33:19.892Z The initial restructuring proposal separates available-asset distributions from claims on future recoveries, with court approval still ahead. [Read as Markdown](https://tokenprimer.com/news/2f333d51-c3ac-4bc7-bcd2-6cb5206c1f7d/index.md) - [DogeOS public testnet: what Dogecoin app builders can test now](https://tokenprimer.com/news/46c2df22-d4d8-41d2-be35-6ff4e92d04d5) — 2026-10-01T12:30:15.576Z The new EVM-compatible environment opens development access, while application availability and a mainnet launch remain separate milestones. [Read as Markdown](https://tokenprimer.com/news/46c2df22-d4d8-41d2-be35-6ff4e92d04d5/index.md) - [What the Federal Reserve stablecoin proposals would require](https://tokenprimer.com/news/57543fa9-5adf-4568-99fc-80a4af7dda00) — 2026-09-25T14:51:27.782Z The proposals cover full reserve backing, capital and risk controls, reserve custody and the application process for supervised banks that want to issue payment stablecoins. [Read as Markdown](https://tokenprimer.com/news/57543fa9-5adf-4568-99fc-80a4af7dda00/index.md) - [What XRP Ledger permission delegation changes if the amendment activates](https://tokenprimer.com/news/c7e1b3c2-93f9-40d7-b162-d530389e4f9a) — 2026-09-24T15:53:54.725Z The amendment lets an account grant another account a limited set of transaction permissions. It replaces an earlier version disabled after a critical bug. [Read as Markdown](https://tokenprimer.com/news/c7e1b3c2-93f9-40d7-b162-d530389e4f9a/index.md) - [What the draft ERC-8419 KYA framework is trying to verify about agents](https://tokenprimer.com/news/f8d9c00d-da8d-48a1-a8f1-3da824559eed) — 2026-09-21T02:48:29.208Z A new Ethereum Magicians draft describes a registry for trust conclusions about agents, with optional zero-knowledge proofs and ERC-8004 integration. [Read as Markdown](https://tokenprimer.com/news/f8d9c00d-da8d-48a1-a8f1-3da824559eed/index.md) - [What a verifiably random game proves, and what players still need to check](https://tokenprimer.com/news/6b2d0cc1-17e5-4bba-89eb-451c7ef2cf6b) — 2026-09-18T12:30:03.844Z A random-looking result and a verifiable result are different things. A VRF produces an output with a cryptographic proof tied to its input and public key, allowing a verifier to check the calculation rather than simply accept a server's claim. [Read as Markdown](https://tokenprimer.com/news/6b2d0cc1-17e5-4bba-89eb-451c7ef2cf6b/index.md) - [PYUSDx and PYUSD are different tokens: who issues each, and what backs them?](https://tokenprimer.com/news/b1217211-70f4-4e08-a4cf-9e7f4be5f757) — 2026-09-17T16:32:21.044Z M0’s platform lets businesses build PYUSD-backed tokens, with issuance handled by MoonPay Digital Assets. [Read as Markdown](https://tokenprimer.com/news/b1217211-70f4-4e08-a4cf-9e7f4be5f757/index.md) - [Digital euro merchant applications open: what the 2027 pilot will test](https://tokenprimer.com/news/5c4be770-bf26-45f4-adc3-b6142c2c32f0) — 2026-09-17T12:25:53.826Z The ECB is recruiting online merchants for a controlled trial, with applications due October 27. [Read as Markdown](https://tokenprimer.com/news/5c4be770-bf26-45f4-adc3-b6142c2c32f0/index.md) - [Arc uses USDC for fees: what Circle’s ARC token mint does and does not mean](https://tokenprimer.com/news/9cae8ec7-8a25-4609-8dfa-4bc4984ba022) — 2026-09-17T02:38:11.737Z The mainnet launch, transaction-fee asset and potential future network token are three different developments. [Read as Markdown](https://tokenprimer.com/news/9cae8ec7-8a25-4609-8dfa-4bc4984ba022/index.md) - [What MetaMask Added Protection checks, and why it costs extra gas](https://tokenprimer.com/news/ab5ddcef-44d0-4bc9-b64f-ba3dd4a44048) — 2026-09-14T21:09:09.410Z MetaMask's onchain checks can reject execution that differs from its preview. Supported smart accounts still pay gas, including when a transaction reverts. [Read as Markdown](https://tokenprimer.com/news/ab5ddcef-44d0-4bc9-b64f-ba3dd4a44048/index.md) - [What can you build with AirnodeHub's 35 API listings?](https://tokenprimer.com/news/61737a8b-dac3-4325-ba8e-c9e20c3dd0ea) — 2026-09-14T11:47:23.533Z Five practical ways to use API3's 35 AirnodeHub listings, covering crypto markets, wallets, economic data, natural events and transport. [Read as Markdown](https://tokenprimer.com/news/61737a8b-dac3-4325-ba8e-c9e20c3dd0ea/index.md) - [API3 staking guide: governance rights, reward targets and APR](https://tokenprimer.com/news/4298df46-d20b-46d1-9ca6-d797a3f1afb3) — 2026-09-11T02:22:03.889Z API3 holders can read staking rewards and governance proposals more clearly by separating participation targets, annual reward rates and token unlock schedules. [Read as Markdown](https://tokenprimer.com/news/4298df46-d20b-46d1-9ca6-d797a3f1afb3/index.md) - [How gas sponsorship lets an Ethereum wallet cover your transaction fees](https://tokenprimer.com/news/41ad29ad-dc73-4341-87eb-2252a2dea49f) — 2026-09-08T05:34:09.828Z Paymasters can fund a transaction while the user pays through a different arrangement. Here is what that changes for a wallet, and where EIP-8141 fits. [Read as Markdown](https://tokenprimer.com/news/41ad29ad-dc73-4341-87eb-2252a2dea49f/index.md) ## Follow and explore - [Topic archives](https://tokenprimer.com/topics) - [RSS feed](https://tokenprimer.com/rss.xml) - [Reading guide](https://tokenprimer.com/llms.txt)