{"id":"9770d291-3bb3-48c8-b472-40f0f29f0094","shortId":"8QgKUC","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at `/api/v1/item/9` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint `/api/v1/item/9` is labeled \"Premium API Access\" in the x402 challenge but lacks further documentation about what data or functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, settled to a wallet on Base. The platform advertises a uniform $0.02/request pricing across all its endpoints.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The exact purpose and output of `/api/v1/item/9` cannot be determined from the available material. Other endpoints on the platform suggest categories like metrics, reports, sentiment analysis, text summarization, price feeds, geocoding, and more, but this specific item endpoint's function is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["The specific function of /api/v1/item/9 is unknown — 'Premium API Access' is the only description available.","No documentation exists: /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt.","No OpenAPI spec or request/response schema is available for any endpoint on this platform.","The endpoint's output and expected input body are completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/9","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/item/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what '/api/v1/item/9' actually does. The docs pages are all empty 'Connect wallet' stubs. This is effectively a stub 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'/api/v1/item/9':34,90,196 '/docs':159 '/pricing':160 '/readme':163 '/request':13,28,148 '0.02':12,27,132,147 '000':127 '20':126 'Base network API' 'USDC API' 'accept':73,118 'access':7,22,95 'across':150 'addit':174 'advertis':144 'ai/ml':54 'analysi':215 'analyt':53 'api':6,21,50,78,94 'avail':189,202 'base':9,24,71,128,141 'call':4,19,135 'cannot':197 'categori':210 'challeng':99,113 'charg':122 'collect':44 'confirm':114 'connect':169 'content':176 'data':52,106 'determin':199 'document':103,154 'endpoint':32,62,89,153,205,227 'exact':191 'exampl':188 'extrem':156 'feed':219 'financ':56 'function':108,229 'gate':64 'geocod':220 'infer':55 'infrastructur':59 'item':226 'key':79 'label':92 'lack':101 'like':211 'limit':82 'live':117 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'materi':203 'maximum':124 'metric':212 'micropayment API' 'network':72 'no-api-key' 'offer':42 'openapi':180 'output':194 'page':164 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':75 'per':3,18,48,134 'platform':40,143,208 'post':119 'post-endpoint' 'premium':5,20,93 'price':149,218 'prompt':171 'protocol':68 'purpos':192 'rate':81 'render':166 'report':213 'request':49,120 'request/response':183 'requir':86 'return':110 'schema':184 'sentiment':214 'settl':136 'span':51 'spars':157 'spec':181 'specif':88,225 'subscript':85 'suggest':209 'summar':217 'technic':175 'text':216 'unclear':231 'uniform':146 'unit':129 'usag':187 'usd':133 'usdc':15,30,74,131 'usdc-base' 'util':60 'via':10,25,65 'wallet':139,170 'web3':57 'x402':11,26,67,98,112 'x402 API' 'x402-payment'","prices":[{"id":"eb21148c-c742-4fe5-a6fc-bad0f3e31e97","listingId":"9770d291-3bb3-48c8-b472-40f0f29f0094","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/item/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:29.318Z"}],"sources":[{"listingId":"9770d291-3bb3-48c8-b472-40f0f29f0094","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:29.318Z","lastSeenAt":"2026-04-22T15:00:33.926Z"}],"details":{"listingId":"9770d291-3bb3-48c8-b472-40f0f29f0094","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/9 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/item/9"},{"claim":"Platform advertises $0.02/request uniform pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","AI agents needing keyless, on-demand API access","Users who want to avoid subscriptions and pay only per use"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone requiring high-throughput bulk access at discounted rates","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:52:22.545Z"},"updatedAt":"2026-04-22T15:00:33.926Z"}}