{"version":1,"updatedAt":"2026-09-15T00:44:46.290Z","count":13,"nextCursor":null,"tools":[{"slug":"echo","name":"Echo JSON","description":"Returns the JSON object you send, unchanged, with server-side call metadata. The reference tool for verifying an end-to-end paid call.","category":"utility","mode":"proxy","protocol":"mcp","url":"https://echo.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.001000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"json-schema-validate","name":"JSON Schema validate","description":"Validates a JSON document against a JSON Schema (draft 2020-12, 2019-09, draft-07) and returns every error with its instance path.","category":"data","mode":"proxy","protocol":"mcp","url":"https://json-schema-validate.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.001000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"html-to-markdown","name":"HTML to Markdown","description":"Converts an HTML fragment or document to Markdown. Scripts and styles are dropped. Takes HTML you supply; it does not fetch anything.","category":"text","mode":"proxy","protocol":"mcp","url":"https://html-to-markdown.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.001000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"url-metadata","name":"URL metadata","description":"Fetches one public URL you supply and returns its title, description, canonical URL and OpenGraph tags. Single fetch only — it does not crawl, follow links, or store page content.","category":"web","mode":"proxy","protocol":"mcp","url":"https://url-metadata.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.010000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"csv-to-json","name":"CSV to JSON","description":"Parses RFC 4180 CSV into JSON rows, with header detection, delimiter inference and type coercion.","category":"data","mode":"proxy","protocol":"mcp","url":"https://csv-to-json.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.001000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"text-language-detect","name":"Language detect","description":"Detects the language of a text sample and returns ranked ISO 639-3 candidates with confidence. Runs locally on n-gram models; no external service sees your text.","category":"text","mode":"proxy","protocol":"mcp","url":"https://text-language-detect.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.000500","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"regex-test","name":"Regex test","description":"Tests a JavaScript regular expression against sample text and returns every match with its groups and offsets.","category":"developer","mode":"proxy","protocol":"mcp","url":"https://regex-test.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.000500","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"unit-convert","name":"Unit convert","description":"Converts between length, mass, volume, time, digital-storage and temperature units. Exact factors; temperature handles offsets correctly.","category":"utility","mode":"proxy","protocol":"mcp","url":"https://unit-convert.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.000500","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"cron-explain","name":"Cron explain","description":"Turns a cron expression into plain English, with 5-field and 6-field (seconds) support and validation.","category":"developer","mode":"proxy","protocol":"mcp","url":"https://cron-explain.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.000500","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"uuid-batch","name":"UUID batch","description":"Generates a batch of cryptographically random UUIDv4s, optionally as compact hex or uppercase.","category":"developer","mode":"sdk","protocol":"mcp","url":"https://sdk-tools.fatstack.net/uuid-batch/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.000500","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"markdown-lint","name":"Markdown lint","description":"Lints Markdown for trailing whitespace, hard tabs, long lines, heading jumps, missing image alt text, bare URLs and unclosed code fences.","category":"text","mode":"proxy","protocol":"mcp","url":"https://markdown-lint.fatstack.net/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9","amountUsd":"0.001000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"askzephy-solana-audit","name":"Solana Anchor Audit (askzephy)","description":"Static security scanner for Solana Anchor programs. POST a repo, get a JSON report of risky code patterns with file/line references and severity labels. Lead generator, not a human audit (disclosed in readme). Routes: /quick-scan $0.005, /audit $0.05, /news $0.01. USDC on Base via x402, live since August 2026.","category":"security","mode":"sdk","protocol":"mcp","url":"https://audit.askzephy.com/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0xf4729bec220090ef08c786e9142898354178771e","amountUsd":"0.050000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}},{"slug":"askzephy-quick-scan","name":"Solana Quick Security Scan (askzephy)","description":"Fast static scan of one Solana Anchor program (repo URL or tarball). Returns a findings list with severity, file:line, and pattern class. Lead generator for code review, not a human audit; recall on labelled corpora is 0/11 (disclosed in readme). AI-authored and AI-operated.","category":"security","mode":"sdk","protocol":"mcp","url":"https://audit.askzephy.com/mcp","payment":{"scheme":"exact","network":"eip155:8453","testnet":false,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","payTo":"0xf4729bec220090ef08c786e9142898354178771e","amountUsd":"0.005000","terms":{"refundable":false,"notice":"Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds."}}}]}