Methodology

What is stablecoin supply vs M2? DDD divides USD-pegged stablecoin supply by U.S. M2 broad money to show stablecoins as a share of U.S. money supply.

What is stablecoin market cap vs M2? In this benchmark, stablecoin market cap refers to tracked USD stablecoin supply from DeFiLlama compared with U.S. M2.

How much of U.S. M2 is represented by stablecoins? The DDD percentage is the answer: USD stablecoin supply divided by the latest available FRED M2SL value.

Does DDD measure stablecoin adoption? Not by itself. DDD measures monetary scale: circulating USD stablecoin supply relative to U.S. M2. Stablecoin adoption also requires usage metrics such as adjusted transfer volume, velocity, active entities, and payment-like transaction activity. For a fuller breakdown, see Stablecoin Adoption Metrics.

Why use U.S. M2? U.S. M2 is a public benchmark for the U.S. dollar money stock, published monthly by the Federal Reserve as FRED M2SL. Stablecoins are not part of M2 — this comparison shows relative scale only, not that stablecoins belong inside the M2 measure.

The homepage shows four scenario cards: today's live DDD reading and three illustrative supply thresholds — $1.5T, ~$2T, and $4T. Each scenario computes what DDD would read if stablecoin supply reached that level, using the current U.S. M2 denominator held constant.

These are not forecasts. Stable Tape is not predicting that any supply level will be reached, or by when. The scenarios exist to show what the DDD benchmark would say at those levels — not to imply they are likely.

Forecast references. The scenarios reference third-party institutional projections to give readers supply-level context: ARK's ~$1.4T 2030 estimate; BNY's cited ~$1.5T 2030 scenario; Citi's ~$1.9T base case and ~$4.0T bull case for 2030; and Bain's high-growth 2030 projection. These are cited for scale context. Stable Tape does not endorse, verify, or adopt these forecasts as its own view.

M2 denominator. Scenario figures hold M2 constant at its current level. Future DDD will depend on both stablecoin supply growth and changes in U.S. M2. If M2 grows at the same rate as stablecoin supply, DDD stays flat even if supply grows substantially.

DDD is designed to be auditable. The numerator starts from DeFiLlama's stablecoin universe, then Stable Tape uses the USD-pegged stablecoin subset for the headline benchmark.

Stablecoin Velocity is a turnover metric. It divides Artemis-filtered stablecoin transfer volume over a window by average Stable Tape USD stablecoin supply over the matching frozen-record window.

The beta uses asset-level Artemis stablecoin symbols as the transfer-volume numerator and Stable Tape frozen Daily Tape records as the supply denominator. Coverage is reported as the included Artemis asset supply divided by the current Stable Tape USD stablecoin universe.

Artemis describes its stablecoin transfer volume as deduped stablecoin activity less intra-exchange transfers and MEV. That makes it a usage-context input, but it is still provider-defined adjusted volume and may change as provider methodology or access changes.

Velocity is separate from Daily Tape and DDD Flow. Daily Tape measures supply expansion and contraction between snapshots. DDD Flow remains research comparing adjusted stablecoin transfer volume with traditional payment or settlement rail volume. Velocity compares adjusted transfer volume with stablecoin supply.

The highest-priority eligible family becomes the Stablecoin Signal. Eligibility includes the thresholds, cooldowns, repetition controls, attribution checks and data-quality guards documented below; meeting one numerical condition does not bypass those safeguards.

1. Record validity. Incomplete, bootstrap and non-canonical records are flagged before any market reading is attempted.
2. DDD benchmark or milestone. A stable rounded “1 in N” change or material raw DDD move may lead. A new U.S. M2 observation leads only when M2 changed and stablecoin supply was flat; routine updates remain evidence.
3. Archive extreme. A record-level daily extreme requires at least 30 canonical records. Until the archive reaches 90 records, the headline states its size.
4. Sequence reversal. The current contiguous run is compared with the immediately preceding opposite run. The quantified comparison is evaluated before simple turn wording. Both legs must clear $250M; 65–94% uses “most”, 95–105% “erased”, and above 105% “more than reversed”, with a 200% cap.
5. Weekly extreme. The largest day in a complete seven-record window must clear $250M and a three-record cooldown, unless it is at least 1.5 times the previous weekly extreme.
6. Large daily movement. Net supply movement of at least $1B becomes the day’s large-move reading.
7. Multi-day streak. Expansion or contraction streaks publish at day 3, 5, 7, 10, 14, 21 or 30, or when an established archive streak is first exceeded.
8. Weekly supply trend. A contiguous seven-record endpoint move provides directional weekly context when it clears the materiality floor.
9. Quiet market with weekly context. A quiet day may carry the complete seven-record trend, unless material offsetting movement takes precedence.
10. Issuer or chain trend. A weekly endpoint story requires clean levels, a material dollar move and a meaningful share of the relevant weekly change.
11. Offsetting movement. Two-sided movement with at least $1B gross can outrank quiet wording when net supply stays close to flat. Names appear only when both matched leaders dominate their respective sides.
12. Broad issuer movement. Breadth must clear participation, materiality and concentration guards rather than reflect one dominant issuer.
13. Quiet reading. Supply inside the flat threshold becomes the fallback only after stronger families and offsetting movement are tested.
14. Net supply movement. A plain directional reading is the final canonical market fallback.

Repetition guards. One prior directional run can produce only one reversal Signal. A different reversal inside the next three canonical records is evidence-only unless its current leg is at least twice the previous reversal leg. Suppressed reversal facts remain visible in the evidence line. Missing dates and flat records break directional runs.

The dollar floors, 25% evidence-mention floor, 200% reversal cap and escalation multiples are provisional constants: with fewer than 90 canonical records they cannot yet be calibrated against deep history, and they will be reviewed as the archive grows. Frozen records are never rewritten — rule and template changes apply from their ship date forward, with separate version labels stored on each new Signal.

Related guarded families cover DDD milestone crossings (a change in the rounded “1 in N” reading), DDD changes on days the Federal Reserve publishes a new M2 value, and days when supply moved across an unusually broad set of issuers rather than one name.

Tweet drafts and Telegram previews. Stable Tape also generates operator-facing research candidates from the same frozen record, evaluating DDD movement, net and offsetting supply movement, issuer, chain and asset changes, reversals, streaks, historical rank, new tracked listings, leaderboard changes and external money-supply milestones. Stablecoin Velocity is evaluated as research too, but can never select the Signal. The published X/Telegram post for a canonical day always carries the frozen Stablecoin Signal verbatim — the same headline shown on the dated Daily Tape record — together with its evidence line and dated permalink. A draft that does not match the frozen Signal word-for-word is blocked from posting. Engagement considerations may influence whether and when a day is distributed, never which fact is selected.

Sub-signals. Alongside the primary Signal, the Tape and dated permalink pages show supporting sub-signals: the DDD reading, the supply movement, and — when a driver can be confidently named — which issuer, chain, or currency stood out. When no single mover is confidently named, a sub-signal may say so instead.

Guarded attribution. One-day issuer and chain moves are clues, not the story by themselves. An issuer, chain, or currency is only named in the primary headline when its move is large enough in dollar terms and accounts for a meaningful share of the day's total move. If a single name's move looks like a data artifact — for example a name appearing or disappearing entirely between snapshots — or the comparison is ambiguous, Stable Tape avoids promoting that name as the main headline.

History wording. “Of the week” appears only when the seven-record window is date-contiguous enough to represent a week. Archive-superlative headlines require at least 30 canonical Daily Tape records; below 90 records, the headline itself states the archive size.

DDD and “1 in N.” The DDD benchmark is always stated as a percentage first. “1 in N U.S. dollars” is only a rounded, plain-English translation of that percentage for readability — raw, unrounded 1-in-N values are never used as the headline figure.

Stablecoin Signal selection does not use price, sentiment, trading volume, transaction volume, payments activity, settlement timing, sponsor input, predictions, advice, or manual editorial preference. Daily Tape describes observed net supply movement between snapshots, not transaction-level mint/burn events. Stablecoin Velocity (see the Stablecoin Velocity beta card above) is separate usage research and does not feed Signal selection.

The /issuers page reports top issuer share, top 2 share, and top 5 share as plain percentages computed from the ranked issuer list. These are not independently sourced — they are derived from the same DeFiLlama issuer supply data used for DDD, sorted descending by current supply.

Top issuer share is the largest single issuer's supply divided by total tracked supply. Top 2 share adds the second-largest issuer (equivalent to TCD). Top 5 share is the sum of the five largest issuers' supply.

Issuer classifications (which stablecoin maps to which issuer) come from DeFiLlama, not from manual judgment calls by Stable Tape. If DeFiLlama updates a classification, the share figures update automatically on the next data refresh.

• DDD is not financial advice. It is a benchmark and market-context layer.
• DDD does not include CBDCs. Central bank digital currencies are not stablecoins and are not in the numerator.
• DDD does not include traditional bank deposits as stablecoins. Tokenised deposits, bank-issued tokens, and fiat bank accounts are not in the DDD numerator.
• DDD numerator is USD-pegged stablecoins only. Non-USD stablecoins (EURC, GBPC, etc.) are monitored as a classification caveat but excluded from the headline DDD numerator.
• DDD is not transaction volume. DDD measures circulating supply, not how much value has moved through stablecoin transactions.
• DDD is not a user count. DDD does not measure active wallets, unique users, or payment adoption.
• DDD is not an endorsement. DDD is not a risk rating, solvency rating, backing audit, or endorsement of any issuer, chain, wallet, neobank, sponsor, or stablecoin. Appearing in the benchmark does not imply quality, safety, or regulatory approval.
• DDD does not claim stablecoins are part of U.S. M2. The comparison shows relative scale, not monetary equivalence.
• The numerator and denominator update on different cadences — stablecoin supply is near real-time; M2 is monthly with a release lag.
• The stablecoin numerator depends on DeFiLlama's pegged-asset dataset. A small amount of non-USD-pegged supply may enter the tracked total if upstream classifications shift.
• Changes in DDD can come from stablecoin supply growth, changes in U.S. M2, or both.

Use the live DDD reading for current context. Use the dated Daily Tape permalink when you need a citable record.

Both underlying data sources — DeFiLlama and FRED M2SL — are freely accessible, so anyone can verify the benchmark inputs independently.

To cite a specific reading, use the dated Daily Tape permalink: stabletape.com/tape/YYYY-MM-DD. Each dated record is frozen, linkable, and shareable — it carries its own dated share card and social preview. For the benchmark methodology, cite this page.