CodeTrain vs VulnFeed

CodeTrain is a Socratic AI coding tutor: it asks questions, reviews what you write, and runs your tests, but never writes the code for you. Free to start.

VulnFeed is also a keyless, pay-per-call CVE & EPSS feed over x402, your agent hits a 402, pays a few cents in USDC, and gets structured, exploit-ranked results.

About CodeTrain

CodeTrain is a Socratic AI coding tutor: it asks questions, reviews what you write, and runs your tests, but never writes the code for you. Free to start. Two steps, about a minute, and the first one is going to catch you. The tutor's replies are pre-recorded, so it knows the handful of ways this lesson usually goes wrong. The real one reads whatever you actually wrote, and it is free for ten lessons a month.

About VulnFeed

VulnFeed is also a keyless, pay-per-call CVE & EPSS feed over x402, your agent hits a 402, pays a few cents in USDC, and gets structured, exploit-ranked results. Top priority: express, the GHSA-29mw vuln has 73% exploit probability. VulnFeed surfaces the ones likely to be used in real attacks. AI agents can pay per request with USDC on Base, no account, no API key, no subscription. # Agent sends request, gets HTTP 402 with payment details # x402 client library handles payment automatically # $0.01 per scan · $0.002 per CVE lookup · $0.05 per monitor # Discovery endpoint: curl https://vulnfeed-api.novadyne.ai/.well-known/x402 Uses the x402 protocol.