## Answer first An agent can only buy what it can price. A discoverable x402 endpoint (1) answers 402 before validating the body, (2) puts a discovery extension (input schema, example, output example) in the 402, (3) lists routes in /.well-known/x402, (4) publishes an OpenAPI spec, (5) appears in the Bazaar discovery index. ## FastAF, checked live (unpaid probe, 28/10/2026) * 402 on every probed GET/POST route (serp, search, maps, amazon, linkedin, youtube, scrape, news, shopping, scholar) * Bazaar extension valid against @x402/extensions, with output example * /.well-known/x402 with 24 routes; OpenAPI 3.1 at [https://api.fastaf.co/openapi.json](https://api.fastaf.co/openapi.json) * Indexed in the Bazaar discovery index (“FastAF”) Result: 37/37 checks passed on the /x402/v1/amazon route (`npx x402-listing-check`, 28 Oct 2026). ## Try it `GET https://api.fastaf.co/x402/v1/amazon?asin=...` → 402 with price from $0.003, then pay per call. No account needed. Or 500 free credits every month after email verification on [https://fastaf.co](https://fastaf.co). ## FAQ ### Do I need an API key? No, x402 pays per request. Accounts are optional. ### Is there an MCP server? Yes, [https://api.fastaf.co/mcp](https://api.fastaf.co/mcp). ## Related pages [x402 scraping API](/x402-scraping-api/) · [How x402 works](/x402/) · [FastAF vs serp402](/compare/serp402/) · [FastAF vs toll402](/compare/toll402/) · [x402 glossary](/glossary/x402/) · [Bazaar in the glossary](/glossary/) · [How agents find an API](/how-to/agent-discovery-files/) ## Reference * [x402 documentation](/docs/#x402): every parameter and response field * [Docs](/docs/): authentication, errors, MCP and [x402](/docs/#x402) * [Pricing](/pricing/): credit packs from $10, without expiry ## Other sources * [How to read public Amazon data when your requests fail](/how-to/read-amazon-data/) * [How to read public Google Search data when your requests fail](/how-to/read-google-data/) * [How to read public Walmart data when your requests fail](/how-to/read-walmart-data/) * [How to read LinkedIn data with an API](/how-to/read-linkedin-data/) * [How to read public eBay data when your requests fail](/how-to/read-ebay-data/) * [How to read public Booking.com data when your requests fail](/how-to/read-booking-data/) * [How to read X profile data with an API](/how-to/read-x-data/) * [How to read public Zillow data when your requests fail](/how-to/read-zillow-data/) * [Pay-per-call web scraping for AI agents with x402](/how-to/x402-pay-per-call-web-scraping/) * [MCP servers for Amazon, SERP and web scraping](/how-to/best-mcp-servers-amazon-serp-scraping/) * [Cost per agent: monthly SaaS vs x402 pay-per-call](/how-to/cost-per-agent-saas-vs-x402/) * [How FastAF handles heavy pages and timeouts](/how-to/heavy-pages-timeouts/) * [Add FastAF to Claude Code, Codex and Cursor](/how-to/add-fastaf-claude-code-codex-cursor/) * [How to detect poisoned or incomplete SERP results in AI agents](/how-to/detect-poisoned-incomplete-serp-results/) * [Cap agent spend per call with fixed x402 prices](/how-to/agent-spend-caps-per-call-pricing/) * [Use FastAF from the Cloudflare Agents SDK](/how-to/fastaf-cloudflare-agents-sdk/) * [FastAF as a fallback search provider](/how-to/search-api-fallback-provider/) * [Budget a scraping job before you run it](/how-to/budget-scraping-job-fixed-prices/) * [Try FastAF for free, no card](/how-to/free-search-api-for-agents/) * [Too many MCP tools? Keep agent context small](/how-to/mcp-tool-schema-bloat/) * [How agents find an API (and where FastAF is)](/how-to/agent-discovery-files/) * [Why agent retries cost more than you think](/how-to/agent-tool-retry-cost/) * [All how-to guides](/how-to/) ## Compare * [FastAF vs SerpApi](/compare/serpapi/) * [FastAF vs Exa](/compare/exa/) * [FastAF vs Tavily](/compare/tavily/) * [FastAF vs Firecrawl](/compare/firecrawl/) * [FastAF vs Apify](/compare/apify/) * [FastAF vs toll402](/compare/toll402/) * [FastAF vs serp402](/compare/serp402/) * [FastAF vs AgentBIT](/compare/agentbit/) * [FastAF vs Amazon PA-API](/compare/amazon-pa-api/) * [FastAF vs Serper](/compare/serper/) * [FastAF vs ScrapingBee](/compare/scrapingbee/) * [FastAF vs ScraperAPI](/vs/scraperapi/) * [FastAF vs Bright Data](/vs/bright-data/) * [Benchmarks](/benchmarks/): latency and cost per 1,000 requests, measured ## Try it on your own request 500 free credits every month after email verification, no card. [Start free](/signup/)[x402 documentation](/docs/#x402) ## Related * [How to read public Amazon data when your requests fail](/how-to/read-amazon-data/) * [How to read public Google Search data when your requests fail](/how-to/read-google-data/) * [How to read public Walmart data when your requests fail](/how-to/read-walmart-data/)