$0.01 USDC required (x402 / Base or Solana) Paid 0.01 USDC. Detected plan, price, and billing-period changes for one catalog slug, newest first, with a paging cursor. Empty array means nothing has been recorded yet, not that the vendor’s price has been stable forever. Check free lastChangeAt first. No API key needed. Pay with any x402-compatible wallet that holds USDC on Base or Solana; the challenge lists both and you pay on whichever network your wallet is funded. If your agent does not yet have a funded wallet, set one up via Coinbase Agentic Wallet or Base MCP — then standard x402 clients will pay and retry automatically.
https://pricing-state-api.replit.app/api/monitors/deepseek/changes