Nemil Dalal

Stablecoins are already a roughly $250 billion market, not a venture-subsidized experiment. Nemil Dalal says issuers can earn roughly 3%-4.5% on the dollars and short-dated government paper backing their tokens, implying more than $10 billion in annual economics: “These are already great businesses.” That yield creates economics for low-fee transfers, user rewards, compliance, market makers, and cash-out infrastructure; Nemil said these can remain attractive businesses even with less margin than traditional banks.

x402 turns the internet’s dormant “402 Payment Required” status into a native payments rail for humans and AI agents. A seller returns a price, network, asset, and payment destination; the buyer signs a stablecoin transaction, resubmits the request with that authorization, and receives the resource once the seller verifies and settles it. The core call is that agents cannot depend on subscriptions, credit-card forms, or advertising when they may buy one query each from many services: “The thing that’s missing is really just money.”

The protocol’s most compelling near-term market is machine-to-machine purchasing of inference, data, messaging, and specialist-agent work. An agent might pay 5 USDC for inference, buy financial data before trading, invoke a paid MCP tool, or hire a specialist model to plan part of a larger task. Coinbase has paired the open standard with Node.js middleware, wallet infrastructure, and optional conversion into bank-account dollars, aiming to make acceptance “basically one line of JavaScript.”

The timing rests on a recent collapse in blockchain costs, not merely renewed crypto enthusiasm. Stablecoins provide monetary stability, while layer-2 systems and cheaper chains brought fees down from historical spikes of $10-$200 to cents or less; Nemil said Base had recently approached 1,000 transactions per second and was targeting settlement below 500 milliseconds. His framing: blockchain transfers are cheap because of “the technology architecture,” not because Coinbase is paying to subsidize them.

Hard wallet controls may make crypto unusually well suited to agents that remain vulnerable to prompt injection and bad judgment. A small agent wallet can segregate risk, while a smart-contract wallet can permit transactions below $10 but require both the agent’s and human’s keys above that threshold—a “two-of-two multisig” that fails regardless of what the model was prompted to do. Nemil nevertheless expects agents eventually to control “millions, if not billions of dollars,” particularly for automated trading and wealth management.

Payments are only the base layer; reputation, collateral, and slashing could determine which agents are trusted with capital or credit. Nemil imagines an NFT-like identity accumulating attestations “like a passport where you’re getting stamps,” creating an “open-source credit bureau” for agents. Capital could then sit in escrow and be confiscated after misconduct, adapting proof-of-stake slashing to Tyler Cowen’s idea that agents may need financial skin in the game.

The largest unresolved issue is systemic control once cheap agents can cooperate, collude, and transact on infrastructure without a universal kill switch. Nathan Labenz pressed for flash-crash-style circuit breakers, citing experiments where Claude agents learned cooperation and punishment while GPT and Gemini did not; Nemil pointed instead to human approvals, reputation, and protocol-level transaction limits. The opportunity extends to AI arbitration and oracles, but only if evidence provenance and model manipulation are constrained: “It doesn’t start with the hardest problem on day one.”

🔗 Original source & video: 402 Payment Required: a New Way for AI Agents to Pay, with Nemil Dalal, Dev Platform Lead @ Coinbase