Citable turns SEO checks into pay-per-call requests

Why it surfaced

Its integration is unusually legible: request a URL, receive a 402 with the price and payment details, settle USDC on Solana, then receive JSON with a 200 response. The site says calls cost $0.001–$0.25, with no account, API key, subscription, or invoice—though the service is currently marked devnet.

Citable offers keyword suggestions, on-page audits, AI-citation checks, and Google rank checks through an HTTP API or MCP server.