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MoonPay Unveils Wallet Standard for AI Agents

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MoonPay Unveils Wallet Standard for AI Agents

The Open Wallet Standard aims to fill a gap in the rapidly growing agentic payments stack by giving AI agents a universal, non-custodial way to hold funds and sign transactions across blockchains.

MoonPay on Monday released the Open Wallet Standard (OWS), an MIT-licensed, open-source specification that defines how AI agents interact with crypto wallets, including key storage, transaction signing, and cross-chain account derivation, without ever exposing a private key to the agent process or the large language model driving it.

The standard launched with contributions from over 15 organizations spanning payments, exchanges, and blockchain infrastructure, including PayPal, OKX, Ripple, Tron, TON Foundation, Solana Foundation, Ethereum Foundation, Base, Polygon, Sui, Filecoin Foundation, LayerZero, and Circle.

“The agent economy has payment rails. It didn’t have a wallet standard,” MoonPay CEO Ivan Soto-Wright said in a statement.

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The release arrives as the infrastructure for agentic payments is rapidly developing, yet remains fragmented across competing protocols, each assuming agents already have a wallet without specifying how that wallet should work.

As The Defiant reported last week, two protocols are racing to become the foundation of AI payments: x402, backed by Coinbase, and the Machine Payments Protocol (MPP), launched by Stripe and Tempo. Tempo’s payments-focused Layer 1, which went live on mainnet on March 18, shipped with MPP’s “sessions” primitive, allowing agents to set a spending limit upfront and stream micropayments continuously without an on-chain transaction per interaction.

On the same day, Coinbase dropped a significant upgrade to x402, adding support for virtually any ERC-20 token via Uniswap’s Permit2 and new gas sponsorship extensions.

Meanwhile, Visa entered the arena with its own approach. Visa Crypto Labs launched Visa CLI, a command-line interface payment tool targeting AI agent payments, currently in closed beta. And Circle launched Nanopayments on testnet, built on the x402 standard and designed for sub-cent, gas-free USDC transactions for AI agents paying for pay-per-call APIs.

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But as MoonPay frames it, all of these systems share a common assumption: the agent already has a wallet. None defines where the wallet lives, how keys are stored, or how one agent discovers a wallet created by another.

In practice, MoonPay says, this means a user running three different AI tools today could have their funds scattered across three separate wallets with no way to access a unified balance.

How It Works

The Open Wallet Standard is structured as seven sub-specifications covering storage, signing, policies, agent access, key isolation, wallet lifecycle, and supported chains. Each module can be adopted independently.

The core design principle is zero key exposure. Keys are encrypted, decrypted only to produce a signature, held in protected memory that cannot be swapped to disk, and wiped immediately after signing. The private key is never accessible to the agent, the LLM context, or any parent application.

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A single seed phrase derives accounts across eight chain families — EVM, Solana, Bitcoin, Cosmos, Tron, TON, Spark, Filecoin, and XRP Ledger — with a unified signing interface and CAIP-2 chain identifiers.

There’s also a pre-signing policy engine that evaluates every transaction before any key material is touched. Operators can set spending limits, contract allowlists, chain restrictions, and time-bound authorizations. The standard ships with native SDK bindings for Node.js and Python, a CLI, and an MCP server interface compatible with frameworks including Claude, ChatGPT, and LangChain.

The launch positions OWS not as a competitor to x402 or MPP but as a complementary layer. When x402 returns a payment request, OWS produces the signed authorization. When MPP opens a session and streams micropayments, OWS signs each payment within the agent’s authorized limits.

Whether MoonPay’s open standard gains traction will depend on whether competing agent frameworks adopt a shared wallet layer or continue building proprietary key management.

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This article was written with the assistance of AI workflows. All our stories are curated, edited and fact-checked by a human.

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Crypto World

Crypto ETP Inflows Slow to $230 Million After Fed Meeting

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Crypto ETP Inflows Slow to $230 Million After Fed Meeting

Crypto investment products maintained their inflow streak last week but momentum slowed amid ongoing Middle East tensions and a “hawkish pause” interpretation of the US Fed’s meeting.

Crypto exchange-traded products (ETPs) recorded $230 million in inflows last week, with $405 million in outflows following the Federal Open Market Committee (FOMC) meeting in the US, CoinShares reported Monday.

The inflows extended the streak to four consecutive weeks, but the latest total was sharply lower than the previous week’s $1.06 billion.

CoinShares head of research James Butterfill largely attributed the slowdown to the market’s “hawkish pause” interpretation of the US Federal Reserve’s Wednesday meeting, rather than broader geopolitical tensions.

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“The intra-week data supports this,” Butterfill said, referring to strong inflows in the first two days of the week before reversing sharply in the wake of the FOMC meeting.

Bitcoin funds lead inflows, while Ether reverses

Bitcoin (BTC) accounted for nearly all of last week’s crypto ETP inflows, posting $219.2 million in gains. Ether (ETH) funds saw $27.5 million in outflows, ending a three-week inflow streak.

Solana (SOL) saw $17 million in inflows for the seventh straight week, bringing the total to $136 million and making it one of the most popular ETP assets in recent months.

Crypto ETP flows by asset (in millions of US dollars). Source: CoinShares

Additionally, notable gains came from Chainlink (LINK) and Hyperliquid (HYPE), with inflows netting $4.6 million and $4.5 million, respectively.

Related: NYSE exchanges scrap crypto options cap on 11 Bitcoin, Ether ETFs

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Crypto ETPs have clocked $1.4 billion of inflows year-to-date, with Bitcoin ETPs leading at $1.2 billion. Total assets under management stand at $138 billion, according to CoinShares.

US spot Bitcoin ETFs account for 43% of gains

About half of Bitcoin ETP inflows were driven by the US spot Bitcoin exchange-traded funds (ETFs) last week, which ended the week with $95.2 million in inflows.

The inflows marked four consecutive weeks of gains totaling $2.2 billion, according to SoSoValue data. Despite the gains, spot Bitcoin ETFs remain underwater year-to-date, with roughly $400 million in outflows.

Weekly flows in spot Bitcoin ETFs since February. Source: SoSoValue

Similar to broader investment products, US spot Ether ETFs failed to maintain the inflow streak after three weeks of inflows, with last week’s outflows totaling around $60 million.

The US spot Ether ETFs have seen $599 million in outflows year-to-date, while broader ETPs were roughly $50 million underwater.

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