{"id":"365c6827-cce1-4fee-b154-0ed18c805f8a","shortId":"xkHyYM","kind":"x402","title":"Search the npm package registry by name, keywords, or description via x402 micropayment.","tagline":"Search the npm package registry by name, keywords, or description via x402 micropayment.","description":"The Scout npm endpoint (`/scout/npm`) is part of the Scout Multi-source Intelligence API hosted at scout.hugen.tokyo. It searches the npm package registry by name, keywords, or description and returns package name, version, description, and quality/popularity/maintenance scores. The endpoint is pay-per-call at $0.005 per request (USDC on Base via the x402 protocol), though the probe's 402 challenge showed a $0.01 price — the OpenAPI spec lists $0.005.\n\nThe endpoint accepts a required `q` query parameter and an optional `per_page` parameter (1–50, default 10). It is part of a larger Scout API that covers 19+ platforms including GitHub, Hacker News, Stack Overflow, arXiv, PyPI, X/Twitter, Product Hunt, Dev.to, Semantic Scholar, and more. Scout also offers aggregated multi-source reports and AI-synthesized deep research endpoints at higher price tiers.\n\nPayment can be made directly via x402 wallet integration, through a broker service (API key from discovery.hugen.tokyo with $0.05 free credit), via MCP transport, or using the `x402-pay` Python SDK. The endpoint returned a live 402 challenge with a sample npm search result for \"mcp server\" showing `@modelcontextprotocol/sdk` version 1.26.0 with a quality score of 0.95, confirming the endpoint is operational.","tags":[],"capabilities":["npm-package-search","package-quality-scores","package-version-lookup","x402-micropayment","usdc-on-base","per-call-pricing","rest-api","json-response"],"categories":["search","dev-tools"],"synonyms":["npm search","npm registry search","node package search","npm package lookup","javascript package search","npm api","package discovery","npm query"],"warnings":["Price discrepancy: OpenAPI spec says $0.005 per call but the 402 challenge header says $0.01. Actual charge may differ.","No dedicated documentation pages found — /docs, /pricing, /api all return 404.","Response schema is inferred from the 402 challenge sample only; full field definitions are not documented."],"endpointUrl":"https://scout.hugen.tokyo/scout/npm","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}]},"qualityScore":"0.780","qualityRationale":"Full OpenAPI schema with parameter details and a live 402 challenge returning a sample npm result. Docs pages (e.g., /docs, /pricing) return 404, so detailed response schemas and field-level documentation are missing. Pricing is documented in the OpenAPI spec ($0.005) though the 402 challenge showed $0.01 — minor 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'0.005':73,97 '0.01':91 '0.05':181 '0.95':220 '1':112 '1.26.0':214 '10':115 '19':126 '402':87,200 '50':113 'accept':100 'aggreg':147 'ai':154 'ai-synthes':153 'also':145 'api':41,123,176 'arxiv':134 'base':78 'broker':174 'call':71 'challeng':88,201 'confirm':221 'cover':125 'credit':183 'deep':156 'default':114 'descript':10,23,55,61 'dev.to':139 'direct':167 'discovery.hugen.tokyo':179 'endpoint':30,66,99,158,196,223 'free':182 'github':129 'hacker':130 'higher':160 'host':42 'hunt':138 'includ':128 'integr':171 'intellig':40 'javascript package search' 'json-response' 'key':177 'keyword':8,21,53 'larger':121 'list':96 'live':199 'made':166 'mcp':185,209 'micropay':13,26 'modelcontextprotocol/sdk':212 'multi':38,149 'multi-sourc':37,148 'name':7,20,52,59 'news':131 'node package search' 'npm':3,16,29,48,205 'npm api' 'npm package lookup' 'npm query' 'npm registry search' 'npm search' 'npm-package-search' 'offer':146 'openapi':94 'oper':225 'option':108 'overflow':133 'packag':4,17,49,58 'package discovery' 'package-quality-scores' 'package-version-lookup' 'page':110 'paramet':105,111 'part':33,118 'pay':69,192 'pay-per-cal':68 'payment':163 'per':70,74,109 'per-call-pricing' 'platform':127 'price':92,161 'probe':85 'product':137 'protocol':82 'pypi':135 'python':193 'q':103 'qualiti':217 'quality/popularity/maintenance':63 'queri':104 'registri':5,18,50 'report':151 'request':75 'requir':102 'research':157 'rest-api' 'result':207 'return':57,197 'sampl':204 'scholar':141 'score':64,218 'scout':28,36,122,144 'scout.hugen.tokyo':44 'sdk':194 'search':1,14,46,206 'semant':140 'server':210 'servic':175 'show':89,211 'sourc':39,150 'spec':95 'stack':132 'synthes':155 'though':83 'tier':162 'transport':186 'usdc':76 'usdc-on-base' 'use':188 'version':60,213 'via':11,24,79,168,184 'wallet':170 'x/twitter':136 'x402':12,25,81,169,191 'x402-micropayment' 'x402-pay':190","prices":[{"id":"83716abd-6194-496d-bc0a-ea2f80d94fe2","listingId":"365c6827-cce1-4fee-b154-0ed18c805f8a","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"},"payTo":"4du4AfkjJEwch2zk3shkPJVZfyJHNDnNjEWC6AboaS5Z","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:34.684Z"}],"sources":[{"listingId":"365c6827-cce1-4fee-b154-0ed18c805f8a","source":"x402_bazaar","sourceId":"https://scout.hugen.tokyo/scout/npm","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.684Z","lastSeenAt":"2026-04-22T09:02:28.902Z"}],"details":{"listingId":"365c6827-cce1-4fee-b154-0ed18c805f8a","quickStartSnippet":"# Using the x402-pay Python SDK\npip install x402-pay\n\nimport x402_pay\nresult = x402_pay.get('https://scout.hugen.tokyo/scout/npm?q=mcp+server&per_page=5')\nprint(result.json())","exampleRequest":{"url":"https://scout.hugen.tokyo/scout/npm?q=mcp+server&per_page=5","method":"GET"},"exampleResponse":{"count":1,"query":"mcp server","source":"npm","results":[{"name":"@modelcontextprotocol/sdk","quality":0.95,"version":"1.26.0","description":"MCP SDK"}]},"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint searches npm by name, keywords, or description and returns package name, version, description, and quality/popularity/maintenance scores.","source_url":"https://scout.hugen.tokyo"},{"claim":"Scout covers 19+ platforms including Reddit, Hacker News, GitHub, Stack Overflow, arXiv, npm, PyPI, X/Twitter, YouTube, Product Hunt, Dev.to, Qiita, Zenn, Semantic Scholar, GitLab, Hashnode, Lobsters, Lemmy, and x402 Bazaar.","source_url":"https://scout.hugen.tokyo"},{"claim":"The 402 challenge returned a sample result for @modelcontextprotocol/sdk version 1.26.0 with quality 0.95.","source_url":"https://scout.hugen.tokyo/scout/npm"},{"claim":"Payment can be made via broker service, MCP transport, or x402-pay Python SDK.","source_url":"https://scout.hugen.tokyo"}],"useCases":["AI agents discovering npm packages matching specific capabilities or keywords","Automated dependency research — finding alternative packages by description","Building toolchains that evaluate npm package quality and maintenance scores","Programmatic package discovery for code generation or scaffolding tools","Comparing npm packages by popularity and quality metrics"],"bestFor":["AI agents needing programmatic npm search without API keys or rate-limit hassles","Developers building automated package evaluation pipelines","x402-native workflows that pay per call with USDC on Base"],"notFor":["Bulk downloading the entire npm registry (max 50 results per call)","Installing or publishing npm packages — this is search only","Free-tier usage with no budget for micropayments"],"kindDetails":{},"updatedAt":"2026-04-22T01:24:31.955Z"}}