Web tools an AI agent pays for per call in USDC, no API key (x402+MCP)
HTTP 402 Payment Required for autonomous agent micropayments in USDC.

x402 micropayments are clever, but the agent economy is still speculative.
AI agent developers needing pay-per-use APIs
RapidAPI · x402 Service Discovery
HTTP 402 Payment Required for autonomous agent micropayments in USDC.
They revive HTTP 402 so agents can automatically buy API calls — the repo ships PayingClient/WalletManager primitives, an @x402-kit/core package, five agent templates (web-scraper, image-gen, search, translation, code-review), a live demo and 93 tests. Smart infrastructure play with a clear demoable surface; the hard part will be UX and economics (wallet funding, gas/settlement, and convincing API operators to adopt x402 instead of existing billing).
One-liner x402 middleware for ElysiaJS; niche stack, nascent payment protocol adoption.
Well-built middleware betting on an agent payment economy that doesn't exist yet.
x402 payments are real, but this SDK is betting on an infant ecosystem.
x402 micropayments are clever, but the API is a thin wrapper around existing crypto data sources.