STX402 Directory is the meta layer for the X402 ecosystem.
Discover and register X402 endpoints, and interact with ERC-8004 agent registries on Stacks.
All endpoints return JSON and accept STX, sBTC, or USDCx for payment.
Why register? Registered endpoints are discoverable by developers and AI agents building on X402.
Get your API in front of the ecosystem, enable automated discovery, and join a growing network of monetized services.
🔗 Looking for utilities? General-purpose
endpoints (hashing, storage, AI, Stacks utilities) have moved to
x402.aibtc.com.
STX402 now focuses on directory and identity services.
See ecosystem links below.
X402 endpoint discovery and registration - make your API discoverable by developers and AI agents across the ecosystem
Use for: Registering your X402 endpoints to join the directory, probing payment requirements, listing available endpoints, managing ownership, transferring endpoints
/registry/list/registry/register/registry/probe/registry/my-endpoints
ai / free
0.003 STX or free
URL shortener with click tracking
Use for: Creating short links, expanding slugs to original URLs, viewing click statistics, managing your links
/links/create/links/expand/:slug/links/stats/links/list
storage_read/write
0.0005-0.001 STX
ERC-8004 agent identity registry on Stacks
Use for: Querying agent metadata, looking up agents by owner, checking agent URIs and versions
/agent/registry/agent/info/agent/lookup/agent/metadata
simple / free
0.001 STX or free
ERC-8004 agent reputation tracking
Use for: Viewing reputation summaries, listing feedback, checking client interactions, generating auth hashes for feedback submission
/agent/reputation/summary/agent/reputation/list/agent/reputation/clients/agent/reputation/auth-hash
simple
0.001 STX
ERC-8004 agent validation tracking
Use for: Checking validation request status, viewing validation summaries, listing validations for an agent
/agent/validation/status/agent/validation/summary/agent/validation/list/agent/validation/requests
simple
0.001 STX