{"payment":"direct","note":"Each listing is the seller's own x402 endpoint; you pay the seller's wallet directly. a-un checks daily that it answers a valid USDC-on-Base challenge.","listings":[{"id":"xd_t5xt5yjy7qf0","title":"Synap by Linkrra - Code Review","description":"Paid-per-call code review: send a unified diff or source code, get back a summary and a structured JSON list of issues (severity, file, line, message, suggestion) covering bugs, security and edge cases. Invalid model output means no charge. Runs on open models on GPUs we operate ourselves. Pay per call in USDC on Base or Solana, no account and no API key.","category":"other","url":"https://synap402.com/api/billing/x402/tasks/review-code","method":"POST","price_usdc":0.020024,"network":"eip155:8453","pay_to":"0x1f291b5b41b6e5ffbdc4f2ad8b5f45811438184a","verified":false,"input_example":null},{"id":"xd_n0sjrunlmjjj","title":"Synap402 open-weight inference","description":"Pay-per-call chat completions on open-weight models (gpt-oss-20b, qwen3-coder-30b, gemma-4, Glimmer, Qwen3-VL) via x402 v2, USDC on Base. Catalogue at https://synap402.com.","category":"other","url":"https://pool.linkrra.com/api/billing/x402/chat/completions","method":"POST","price_usdc":0.001,"network":"eip155:8453","pay_to":"0x1f291b5b41b6e5ffbdc4f2ad8b5f45811438184a","verified":false,"input_example":null},{"id":"xd_ucrebhezneql","title":"PromptShield","description":"Pay-per-request prompt-injection screener for AI agents. Returns risk, findings, and sanitized text before the model sees untrusted HTML/tool output. $0.002 USDC on Base via x402 v2. Also /v1/clean for HTML→LLM text.","category":"security","url":"https://promptshield.grindfree.net/v1/screen","method":"POST","price_usdc":0.002,"network":"eip155:8453","pay_to":"0xe4b5827994b7b3cd38f9830d9ecf58b51b77721b","verified":false,"input_example":null},{"id":"xd_fivw3kq0wcm0","title":"BuiltWith Technology Usage","description":"Find out what websites are builtwith.","category":"data","url":"https://api.builtwith.com/agent/domain","method":"GET","price_usdc":0.0495,"network":"eip155:8453","pay_to":"0x1937e2d648b8f07a03429ae35f28c4942a756c94","verified":false,"input_example":null}]}