Re:Show HN: X402 Agent Starter Kit: AI agents that pay for t...
by alfredz0x on Thursday February 19, 2026 @11:37PM
(#47083820)
Nice work. I run x402 endpoints in production (httpay.xyz) — currently 100+ endpoints covering web scraping, search, image gen, LLM inference, etc. all behind 402 paywalls on Base USDC.
A few observations from the operator side:
1. Discovery is the real bottleneck. The protocol itself works well, but agents need a way to find x402 endpoints. We built an MCP server that lets Claude/other agents discover and call x402 APIs without hardcoding URLs. Your starter kit + an MCP discovery layer would be a strong combo.
2. Wallet UX matters more than you'd think. Most friction we see isn't the 402 handshake — it's agents managing wallet balance, gas, and chain selection. Curious how your CDP integration handles low-balance scenarios.
3. Testing against real endpoints: if anyone building with this kit wants live x402 endpoints to test against, httpay.xyz has a public catalog. Easier than spinning up your own server just to validate the client flow.
A few observations from the operator side:
1. Discovery is the real bottleneck. The protocol itself works well, but agents need a way to find x402 endpoints. We built an MCP server that lets Claude/other agents discover and call x402 APIs without hardcoding URLs. Your starter kit + an MCP discovery layer would be a strong combo.
2. Wallet UX matters more than you'd think. Most friction we see isn't the 402 handshake — it's agents managing wallet balance, gas, and chain selection. Curious how your CDP integration handles low-balance scenarios.
3. Testing against real endpoints: if anyone building with this kit wants live x402 endpoints to test against, httpay.xyz has a public catalog. Easier than spinning up your own server just to validate the client flow.