Stablecoins: From Speculation to Infrastructure
How stablecoins quietly became the world’s fastest-growing payments rail
The total stablecoin market cap has quietly crossed $300B+ and $27.6T in onchain volume in 2024 – already more than Visa and Mastercard combined. Stablecoins are no longer a crypto niche; they have become new global payments infrastructure built on crypto rails.
What changed: institutional players like Visa, Stripe, Mastercard, and PayPal moved from pilots to real deployments. Regulation (GENIUS Act in the US, MiCA in Europe) de-risked the category. And startups like Rain and Mesta are transforming stablecoins into enterprise-grade payment and settlement rails.
The numbers
A few data points tell the story:
$300B+ stablecoin supply by the end of 2025, up from ~$205B at the start of the year, with $70B of net inflows in 2024 compared with a $7B outflow in 2023.
USDT at ~60%, USDC at ~25% together controlling ~94% of total supply.
Volume is now largely uncorrelated with crypto trading, which is the tell: stablecoins are now used for utility, not speculation.
Stablecoin issuers collectively hold $150B+ in US Treasuries, making them a top-20 holder of US government debt.
The deepest traction is in regions where legacy finance is weakest.
Across Africa, the Middle East, Latin America, and the Caribbean, stablecoin balances have grown from virtually zero in 2020 to 2.7% of total bank deposits by 2024, a new chapter in dollarization happening from the ground up.
Stablecoins now account for 45% of all crypto transaction volume in Sub‑Saharan Africa, with 70% of users relying on them for remittances and savings rather than speculation. As one African fintech founder put it: “It isn’t about stables vs. other tools. It is stables or nothing.”
In Southeast Asia, an estimated 43% of B2B cross-border payments now touch stablecoin rails. In markets like Indonesia and the Philippines, where large shares of adults remain unbanked, stablecoin wallets are emerging as a key on‑ramp to digital finance.
Global remittance fees average 6.5% (~9% in Sub-Saharan Africa). Stablecoins settle for under 0.1%. That spread is pure opportunity.
Rain: Stablecoin-powered Visa infrastructure
Rain is what stablecoin rails look like at scale.
Founded: 2021, New York
Funding: $88.5M in 2025
Core breakthrough: first Visa Principal Member to settle 100% of card payment volume in stablecoins
Rain’s single API lets enterprises, neobanks, and wallets issue physical and virtual Visa cards linked to stablecoin wallets accepted at 130M+ merchants worldwide. Programs run live in 150+ countries via 100+ partners, with 10x transaction volume growth since January 2025.
The strategic moves show how they see the stack:
Joined Western Union’s Digital Asset Network for global cash-out
Partnered with Nuvei for 7-day merchant settlement across LatAm
Acquired Uptop (on-chain rewards for the Cavaliers and Pistons) to expand into loyalty programs
Rain’s bet: cards, payouts, and loyalty all settle on stablecoins. Visa becomes the UX. Stablecoins become the money.
Mesta: Rewiring cross-border flows
Where Rain focuses on cards, Mesta aims at cross-border B2B and treasury flows.
Founded: 2023 by Sandeep Pyapali, former head of Uber’s Global Payment Network.
Funding: $7.5M
Mesta has built a compliance-first hybrid network. It accepts fiat or stablecoins, routes over stablecoin rails for speed and cost, and delivers as local fiat in 50+ currencies across 100+ countries. Settlement takes minutes instead of days and saves more than 50 percent versus SWIFT because no nostro accounts are required.
Growth has been explosive:
$12M TPV 12 weeks post-launch
$140M+ by September 2025
$2B annualized run rate announced at Money20/20 in October
Mesta’s pitch is simple: keep your bank accounts and existing workflows, but route the hard part (cross-border flows) using stablecoin rails. The customer interact with blockchains. They just see faster, cheaper money movement.
Regulation caught up
Two years ago, the default institutional answer was: “We’d like to, but regulators.” That excuse is gone.
GENIUS Act (US, signed July 2025): Payment stablecoins are not securities or commodities. 1:1 reserve backing required. Federal and state licensing paths. Stablecoin holders get priority claims in bankruptcy.
MiCA (EU, live December 2024): E-money tokens must be issued by regulated institutions. Circle’s USDC and EURC are currently the only top-10 stablecoins fully compliant; USDT has faced delistings.
Even the IMF now acknowledges the inclusion and efficiency case—while flagging currency substitution risks, the tone has shifted from skepticism to conditional endorsement. The regulatory overhang flipped from “we’ll see” to “yes, with guardrails.”
Where this goes
A few things feel clear:
Stablecoins are now a core financial primitive. $300B in float and $27.6T in annual volume is past the point of experiment.
Emerging markets are leading on real-world usage. From LatAm dollarization to African FX workarounds to Southeast Asian B2B rails: the developed world is playing catch-up on utility.
Regulatory clarity flipped the board. The risk now is not experimenting at all.
Infra players like Rain and Mesta are early but real. Rain turns stablecoins into a card and loyalty rail with Visa-scale reach. Mesta turns them into a cross-border B2B rail with real volume.
The question isn’t whether stablecoins become critical infrastructure. The data answered that. The real questions are who captures the value on top of these rails and how quickly traditional finance integrates or gets routed around.