x402scan: The discovery layer for x402

About this session

x402 had working payment plumbing and no way to see what was running on it. Shafu presented x402scan as the explorer for it. A permissionless payments standard creates two problems at once, finding what exists and knowing whether it works, and agents cannot spend money unsupervised until both are handled.

There was not much to look at when his team started. A few weeks earlier the protocol had around fifty thousand transactions, roughly half of which he believed were the issuing team's own integration tests, both his own unverified figures. Nowhere to try a resource, and one community dashboard. x402scan indexes the transactions, the servers exposing paid resources, and the facilitators. A facilitator takes the client's signature and does the on-chain work, so a developer exposing a paid endpoint never touches wallets, gas or nonces. New facilitators arrive by community pull request, after which their resources are indexed automatically.

Resources can also be used from inside the explorer, with either a wallet it provides or your own. The comparison he drew was Etherscan, with the difference that all of this is open source: the front end, the indexer, the syncer and the proxy. He counted more than thirty contributors, only seven of them from his own team.

Then there is the cost of letting anyone publish. Plenty of paid endpoints do not work and some are malicious. Calls made through the explorer pass through its proxy, so each resource can be scored on uptime, latency, request volume and success rate. The point is not that people browse those scores. An agent holding its own funds can be told to ignore anything below a chosen threshold. He demonstrated a chat interface where an agent paid a few cents for an endpoint mid-conversation and used the response in its next answer. An agent that meets a paywall today just stops.

He was blunt about what had driven attention so far. A memecoin launched around the protocol, which he called unsustainable and set against the need for resources that are actually useful. His wider argument was that paying a few cents for an article or a video is a plausible alternative to advertising.