This is the weekly roundup for Sep 14–20, 2026.
The week's defining fact is the reversal of last week's anomaly: the buyer count that collapsed to 41,959 returned to 114,977, and the two comparison bases that had diverged by 42% closed to 5.3%. Sales still fell 15.28% to $37.54M. The 12 stories below also include the week's two largest policy events — the CLARITY Act's Senate failure and the SEC's five-year exemption for tokenised securities — alongside Circle's Arc launch and S&P Global's agreement to buy OpenZeppelin.
The Stories
NFT sales fall 15.28% to $37.54M — as buyer addresses jump 174%
Summary. Global organic NFT sales fell 15.28% to $37.54M in the seven days to Sep 19, per CryptoSlam, from a prior week the capture puts at about $44.31M. Buyer addresses rose 174.04% to 114,977 and seller addresses rose 151.72% to 108,037 — the reverse of last week, when the buyer count collapsed 84.67% to 41,959. Transactions fell 9.08% to 808,432. Ethereum led the chains at $15.32M (down 2.66%) with buyer addresses up 63.82% to 13,546, and Base was the only top-five network to grow, up 4.06% to $2.16M.
Commentary. A collapse to 41,959 and a rebound to 114,977 in consecutive weeks is the strongest evidence yet that the buyer series moves with address attribution as much as with behaviour — which is why the site flagged it as unresolved rather than describing 230,000 wallets leaving.
Source: Bitcoins News ↗
Alchemix V3 Transmuter #219 tops the week at $770,985
Summary. The week's largest NFT sale was Alchemix V3 Transmuter #219 at $770,985, per CryptoSlam's Sep 19 capture. The collection ranked third by weekly volume at $1.83M, up 622.03% — almost all of it from eight transactions involving four buyer and three seller addresses. Courtyard (Polygon) again led collections at $6.30M across 123,504 transactions, with 18,459 buyers and 14,921 sellers. Argonauts (Ethereum) was second at $2.74M, down 36.91% on 1,204 transactions.
Commentary. Eight transactions producing a top-three collection ranking is the same concentration pattern the site has flagged for three weeks: the ranking says where the money was, not how many people spent it.
Source: FinWire ↗
Bitcoin back above $80,000 as total crypto market cap adds 5.2%
Summary. Bitcoin traded near $81,072 on Sep 19, up 5.9% over 24 hours and back above $80,000 for the first time since Sep 4; Ethereum was near $2,609, up 6.7%. Total crypto market capitalisation reached about $2.86 trillion, up 5.2%, with the fear-and-greed index at 71, in greed territory, per CoinGecko data cited by Coin Gabbar. The advance followed the SEC's five-year exemption for tokenised securities on Sep 17 and the CFTC sending its own crypto rulemaking to the White House.
Commentary. NFT sales fell over the same window. Floors and volumes failing to follow a crypto rebound is now a four-week pattern rather than a one-week anomaly.
Source: Coin Gabbar ↗
Ethereum's Glamsterdam upgrade clears a testnet rehearsal toward 200M gas
Summary. Ethereum's Glamsterdam upgrade cleared a rehearsal on Sep 17, with the test network raising its per-block limit of work toward 200 million gas, and developers confirmed dates on Sep 18 ahead of a proposed Oct 6 public test. The upgrade targets a more than threefold increase in the gas limit alongside other capacity changes. Client teams also warned that free test ether could let fake builders outbid rivals and withhold transaction payloads, and received about half the usual review time before the Sepolia fork. No mainnet date has been fixed.
Commentary. Capacity does not lift floors on its own, but it changes the cost arithmetic behind every on-chain settlement — a fee story that NFT marketplaces price into their own cuts.
Source: CoinDesk ↗
SEC grants a five-year exemption for trading tokenised securities
Summary. The SEC issued a five-year 'Innovation Exemption' allowing platforms and liquidity providers to trade blockchain-based tokenised NMS securities without registering as exchanges or dealers. Platforms must notify issuers before listing a tokenised version of their shares and must not list if the issuer objects, and synthetic tokens offering derivative exposure to equities are prohibited. Tokenised shares must carry the same rights as the underlying stock, including voting and dividends. The relief arrived two days after the CLARITY Act failed its Senate procedural vote.
Commentary. This is the substantive US development of the week. A five-year window for tokenised equities puts more demand on the same settlement rails NFT markets already use.
Source: U.S. SEC ↗
S&P Global agrees to acquire OpenZeppelin
Summary. S&P Global announced on Sep 17 an agreement to acquire OpenZeppelin, the smart-contract security firm whose open-source Contracts libraries underpin more than $37 trillion in value transferred, including most large stablecoins and tokenised funds. OpenZeppelin has run more than 900 security engagements and reports more than 10,000 vulnerabilities surfaced before production. Financial terms were not disclosed and S&P Global said the deal will not materially affect its results; OpenZeppelin keeps its name and its chief executive, Demian Brener, reporting to the president of S&P Global Ratings. The deal follows S&P Global's Sep 14 investment in the data firm Kaiko as part of a Series B extension to $110M.
Commentary. A credit-ratings agency buying the standard smart-contract library is a clearer commitment of institutional capital than any single NFT fundraise this year.
Source: S&P Global ↗
Rice Robotics and Pudgy Penguins launch a companion robot
Summary. Robotics firm Rice Robotics partnered with Pudgy Penguins to launch a companion robot called Pengu Minibot, which the companies describe as supporting mobility and interaction and bringing the penguin IP into a physical product. The launch extends a licensing strategy that has already put Pudgy Penguins toys on Walmart and Target shelves and turned the collection's brand reach into its main commercial argument. Neither company disclosed pricing, unit volumes or a shipping date in the announcement as reported.
Commentary. The Pudgy Penguins floor fell 6.29% in the week the brand announced a hardware product — licensing reach and secondary-market floors are separate businesses, and only one of them is on-chain.
Source: PANews ↗
Circle launches Arc, a USDC-gas layer 1, with 100+ institutions on day one
Summary. Circle turned on its Arc blockchain on Sep 16, an EVM-compatible layer 1 that settles transaction fees in USDC rather than a separate gas token and targets sub-second finality. More than 100 banks, exchanges and crypto service providers joined on the first day, including BlackRock, Visa and OpenSea, and Circle positioned the network for programmable money and agent-driven payments as well as institutional settlement. Reported first-day activity was dominated by memecoins rather than institutional volume.
Commentary. A marketplace in a stablecoin-first chain's founding cohort is the more interesting line: settlement rails, not minting, are where marketplace economics are moving.
Source: Circle ↗
CLARITY Act fails its Senate procedural vote, 49–50
Summary. The Digital Asset Market Clarity Act failed a Senate cloture vote on Sep 15 by 49–50, short of the 60 required to advance, after 17 state attorneys general urged rejection and negotiators could not bridge differences over ethics provisions and the bill's DeFi and credit-union clauses. CoinDesk reported the failure essentially ends market-structure legislation in the Senate for 2026. The CFTC responded by sending a rulemaking package on crypto asset transactions and markets to the White House for review, together with a no-action position for software developers.
Commentary. The US rulebook is now being written by agencies rather than Congress, which makes the SEC's exemption route the one that actually changes what platforms can list.
Source: CoinDesk ↗
OpenSea and MetaMask keep their tokens undated
Summary. OpenSea's SEA token remains postponed with no revised launch date, six months after chief executive Devin Finzer cited challenging market conditions in March 2026; the capture notes the NFT market's total capitalisation fell from about $3.2B in mid-January to roughly $1.62B at the time of that announcement. Consensys has linked a MetaMask token to its own decentralisation plans while delaying its IPO to at least autumn 2026, with JPMorgan and Goldman Sachs as underwriters, and has not resolved the MASK ticker conflict with Mask Network. Both platforms have restructured reward programmes while the launches stay on hold.
Commentary. Two of the largest consumer venues in NFT history are running loyalty programmes without a token — and the longer the delay, the more the rewards programme becomes the product.
Source: Coin Alert News ↗
OpenSea brings Solana NFT trading back to OS2
Summary. OpenSea has activated full Solana NFT trading on its OS2 platform, ending a four-year absence and making Solana the first non-EVM network integrated for collectibles, alongside support for more than 25 chains. The rollout includes day-one support for Mad Lads, Claynosaurz, Collector Crypt, BoDoggos and Phygitals, at a standardised 1.0% platform fee on secondary sales and 0.85% on fungible swaps. OpenSea announced the integration on Aug 31 and trading was reported fully operational in early September. Solana's NFT sales were $1.89M in the week to Sep 19, down 11.08%, on 25,301 buyer addresses.
Commentary. Solana buyer addresses rose 164.90% while its sales fell — the marketplace effect is showing up in participation before it shows up in value.
Source: Bitcoins News ↗
Stable.com adds Polygon for direct-to-bank stablecoin transfers
Summary. Polygon said on Sep 17 that Stable.com had added the network for direct-to-bank stablecoin transfers, the latest integration in what Polygon calls its Open Money Stack. The addition follows the network's 'One API for Any Payment' positioning in September and earlier integrations including Revolut's EURR euro stablecoin and participation in the Bank of England's Digital Pound Lab phase 2. Polygon's organic NFT sales were $7.09M in the week to Sep 19, against $18.07M of wash volume.
Commentary. Payments are the part of Polygon's activity that is not wash-traded, which is why its organic and combined NFT figures diverge so sharply.
Source: Polygon ↗
What We Are Watching
- Whether buyer addresses hold above 100,000 — one week back in six figures against one week at 41,959 leaves the address series itself the open question.
- Whether the two comparison bases keep converging — the gap narrowed from 42% to 5.3%; a third narrow print would settle the series' window problem.
- Whether BAYC's floor gain extends — it was the only one of five to rise, +0.91%, on 48.94% less volume.
- Whether Polygon's wash ratio keeps climbing from 2.55× after snapping back above 2.5×.
- Whether Solana posts a third growth week now that OS2 is live, or participation keeps rising while value falls.
- Whether the SEC's tokenised-equity exemption pulls settlement volume onto the chains NFT markets already use.
Frequently Asked Questions
Did NFT sales fall 15.3% or 19.8% this week?
Both figures describe the same $37.54M. The 15.28% decline is measured against the roughly $44.31M prior-week base the Sep 19 capture cites; the 19.75% decline measures the same figure against the $46.78M recorded in our Sep 12 capture. CryptoSlam does not publish the span behind its comparison, so both are shown.
How can buyer addresses more than double in one week?
The count went from 41,959 to 114,977. The two captures' address changes now reconcile almost exactly (+174.02% on our base against +174.04% as reported), which points to attribution rather than 73,000 new wallets arriving. Two consecutive weeks at opposite extremes is a property of the metric, and we treat it as one.
Which chain had the most NFT sales?
Ethereum, at $15.32M — 40.8% of global organic volume — followed by Polygon at $7.09M, Bitcoin at $4.33M, BNB Chain at $2.58M, Base at $2.16M and Solana at $1.89M. Base was the only one of the six to grow, up 4.06%.
Does wash trading change the chain ranking?
It changes what the ranking means. Polygon's $7.09M organic came alongside $18.07M of wash volume, a 2.55× ratio, and Base's $4.80M of wash again exceeded its $2.16M organic total. Ethereum's wash was $443,802. No wash figure was published for Bitcoin, BNB Chain or Solana.
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