Service directory

The HPP x402 directory is the catalog of paid x402 services on HPP. It's how an agent finds something to pay for without being handed a URL — the discovery layer that makes autonomous, agentic payments practical.

You browse it at x402-explorer.hpp.io, the HPP x402 Explorer.

Find a service →List your service →

How a service gets listed

Two paths, and you don't have to choose in advance:

1. Auto-indexed. On a service's first settled payment, the facilitator publishes the settlement and the directory indexes the service — its URL, price, scheme, network, and description (advertised via the @x402 Bazaar extension; hpp-x402 serve does this by default). Nothing to sign up for. Pass --private, or omit the metadata, to stay unlisted.
2. Seller-registered. The seller signs in at My services and registers the service, proving ownership of the payout address with a signature. That listing carries a Verified badge and can be edited, delisted, and given an on-chain identity.

Because listing is anchored in real settlements and signed ownership, the directory is a trust signal: entries are services that have actually been paid for, or whose payout wallet has proven it controls them — not self-submitted claims.

Browse it

As a human — the Explorer catalog searches by intent ("check a wallet for sanctions") across both HPP networks.

From an agent — the Explorer is an MCP server; see Connect an agent. The bridge also exposes hpp_discover, so an agent can search the directory and pay in the same session.

From the CLI:

hpp-x402 discover --limit 10                 # everything, newest first
hpp-x402 discover "compute" -t http          # search + filter by type
hpp-x402 discover --scheme upto              # only usage-based services

Each result shows type · scheme · price · network · URL · id. Pay one with hpp-x402 call <url-or-id>.

REST API

The directory is a read-only REST service — useful for building your own explorer or agent tooling.

Endpoint	Returns
GET /discovery/resources?type&network&limit&offset	a page of listed services
GET /discovery/search?q&type&network&limit	full-text + semantic search
GET /discovery/resources/:id	one service's full detail (metadata, schema, trust signals)

curl "https://x402-explorer.hpp.io/discovery/resources?type=http&limit=5"

Filters: type (http / mcp / a2a), network (CAIP-2, e.g. eip155:190415), and limit / offset for paging.

Related

• Find a service — a visual walkthrough of the Explorer.
• List your service — get your own service into the catalog.
• Pay from an AI agent — give an agent access to the directory.
• How it works — the 402 flow and payment schemes.