x402 is an open protocol from Coinbase that lets AI agents pay for online services without human approval. It uses crypto wallets · mostly USDC · on chains like Base, Solana, and Stellar. Behind the scenes, it's HTTP error 402 · Payment Required turned into a standard way for machines to transact.
When an AI agent calls an API, the server can respond with a 402 instead of the data. The agent signs a tiny crypto authorization, the payment settles on-chain in seconds, the data flows. No credit card. No invoice. No human in the loop. lookx402 watches every one of those payments, in real time, and turns them into something you can read.
Why this matters
Until now, AI-agent payments happened in the dark · between machines, in HTTP headers, invisible. With x402 settling on a public blockchain, every transaction is recorded forever. That changes the conversation.
Companies deploying agents can finally see what their bots are doing with the budget. Journalists can watch the agent economy emerge in public. Compliance teams can trace flows. Researchers can study M2M (machine-to-machine) economies as they happen. We don't speculate on what AI will do · we map what it's already doing.
Frequently asked
What exactly is an AI agent?
An autonomous program · like a coding assistant, trading bot, or research agent · that has been given a crypto wallet and the right to spend on its own. It calls APIs, buys compute, pays other agents · without a human clicking 'pay' each time.
Why are most of the wallets anonymous?
x402 was designed so the service identity sits in HTTP headers (off-chain), not on the blockchain itself. The result: 99% of merchant wallets receiving payments today have no public label. We identify them by behavior patterns, not identity.
How accurate is your data?
We index every public x402 transaction directly from the blockchain (no third-party feeds). Latency is at most 5 minutes · the cron interval. We track the real payer (the agent that signed the authorization), not the facilitator that broadcast it on-chain.
Are you affiliated with Coinbase, OpenAI, Anthropic, or a facilitator?
No. lookx402 is an independent public observatory. The data is public on-chain · anyone could build this. We just made it readable.
What about Solana, Stellar, or other chains?
Base mainnet is live now and represents ~89% of x402 volume today. Solana and Stellar indexing is on the roadmap.
Can I export the data or get alerts?
An API and alert system are in the works. The X account @lookx402 already publishes anomaly alerts (whales, marathons, concentration spikes) in real time.