Market Daily: UK crypto rules, higher rates and Arc’s launch

Crypto users have three different kinds of change to separate today: clearer guidance on future UK regulation, a US interest-rate increase that has already happened, and a new blockchain moving into public use. None means the same thing as an investment opportunity. Here is what changed, who it affects and what to watch next.

The FCA has defined more of the UK regulatory boundary

The Financial Conduct Authority published final guidance on 16 September explaining when cryptoasset activities may require its authorisation under the forthcoming regime. The covered activities include operating trading platforms, dealing in cryptoassets, safeguarding customers’ assets, arranging staking and issuing qualifying stablecoins. A stablecoin is a cryptoasset designed to maintain a steadier value by reference to an asset such as a national currency.

The FCA says applications for authorisation open on 30 September 2026, while the regime comes into force on 25 October 2027. Its policy statement says existing registrations and permissions will not convert automatically.

For readers, this does not itself change the tax treatment or legal status of their holdings. It is an important step towards determining which businesses must be authorised and which services fall inside the regime. The FCA also plans an October consultation on targeted changes concerning areas including qualifying stablecoins, decentralised protocols and some safeguarding arrangements.

Custody deserves particular attention. The FCA Handbook says a service presented as self-custody may still fall within safeguarding regulation under the new regime if the provider retains a way to transfer the customer’s cryptoassets. Readers comparing wallets should therefore look beyond the product label and establish who can actually control transfers. Anyone moving assets between services can use Cristoniq’s step-by-step crypto transfer checks to reduce avoidable address and network errors.

Circle says its Arc blockchain is now live

Circle announced the public mainnet launch of Arc on 16 September. A mainnet is the live version of a blockchain where real assets and transactions can be used, rather than a test environment.

According to Circle’s launch announcement, Arc uses USDC for transaction fees and launched with more than 100 applications and more than 100 institutional and ecosystem builders. USDC is a stablecoin intended to track the US dollar. Circle presents the network as infrastructure for uses including payments, foreign-exchange settlement, tokenised assets and transactions initiated by software agents.

The distinction between launch and adoption matters. Circle’s release supports the claim that the public network has launched and records its launch-day participation claims. It does not independently demonstrate sustained usage, security under prolonged public demand or investment value. Circle also says network-wide confidential transactions remain in development, so that feature should not be treated as completed.

The practical development is that businesses and developers can now use the public mainnet rather than relying on a launch announcement alone. Readers should watch for verifiable transaction activity, service availability and independent evidence that announced integrations are being used.

A US crypto tax bill has cleared a committee, not Congress

The US House Ways and Means Committee approved the Digital Asset Tax Certainty Act by 38 votes to five on 16 September. The committee says the bill would address reporting for small transactions, mining and staking income, how traders value their holdings for tax, and rules designed to prevent tax avoidance.

This is a proposal advancing through the US legislative process, not enacted law. It does not change UK tax guidance. Its significance is that detailed questions about crypto use, staking and reporting have entered formal legislative consideration, but the text may change or fail to become law.

The Fed raises rates: why crypto readers should care

The US Federal Reserve raised its target interest-rate range by a quarter percentage point to 3.75% to 4% on 16 September. Its official statement says inflation remains elevated.

This matters beyond US banks. The Fed influences borrowing costs and the returns available from cash-like assets. Higher rates can make speculative investments less attractive by comparison, but the effect on crypto is not automatic: expectations and other developments also matter. A rate increase is a change in the backdrop, not a reliable instruction to buy or sell.

In this morning’s five-asset snapshot, all five were higher over the preceding 24 hours, with Chainlink and Solana showing the largest percentage gains. That sample is not the whole market, and it does not establish what caused those moves. The useful next check is whether the direction persists, rather than treating one observation as a settled trend.

Dated developments to watch

• 30 September 2026: the FCA authorisation window is scheduled to open. Watch for practical application guidance and announcements from firms serving UK customers.
• October 2026: the FCA plans a targeted consultation covering matters including qualifying stablecoins, decentralised protocols and certain safeguarding arrangements.
• After the 16 September launch: assess Arc through observable network activity and functioning integrations, not launch-day participation claims alone.
• Next US legislative step: watch whether the Digital Asset Tax Certainty Act advances beyond committee and whether its provisions change. Committee approval is not enactment.
• 17 September: watch how US bond yields, the dollar and crypto prices respond after the Fed decision. Compare subsequent observations with this dated snapshot; do not assume a single shared cause.

This briefing is educational market context, not personalised financial, tax or investment advice. Check current official guidance and your provider’s instructions before acting.