{"id":"fa788402-f7cc-4ed5-a5f1-9bc9b737cd21","shortId":"wB4wN4","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/6` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol, settling payments in USDC on the Base network. The listed price is $0.02 per request (20,000 base units of USDC with 6 decimals), with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific resource at `/api/v1/item/6` is labeled \"Premium API Access\" but lacks detailed documentation about what data or functionality it returns. The crawled docs, pricing, and README pages all rendered only a wallet-connect prompt with no additional technical content. The platform advertises 16+ endpoints across categories including metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nThe x402 challenge was successfully captured, confirming the endpoint is live. It accepts POST requests, returns `application/json`, and settles via the \"exact\" scheme on Base using USDC (contract `0x8335…2913`). However, there is no OpenAPI schema, no request/response examples, and no substantive documentation beyond the landing page listing. The actual behavior of `/api/v1/item/6` specifically is unclear — it may be a generic or demo endpoint rather than a distinct service.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["No documentation available — docs, pricing, and README pages only show a wallet-connect prompt","The specific functionality of /api/v1/item/6 ('Premium API Access') is not described anywhere","No OpenAPI schema or request/response examples provided","The platform lists many endpoints but none have detailed technical docs in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and the x402 challenge is well-formed with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/item/6 actually does. The docs/pricing/README pages all resolve to a bare wallet-connect prompt. This is effectively a stub 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'/request':13,28 '0.02':12,27,82,176 '000':86 '0x8335':207 '16':150 '20':85 '2913':208 '6':92 'Base network API' 'USDC API access' 'accept':191 'access':7,22,115 'across':152 'actual':228 'addit':144 'advertis':149 'ai':54 'analysi':158 'analyt':53 'api':6,21,50,96,114 'application/json':195 'base':9,24,76,87,203 'base-network' 'behavior':229 'beyond':222 'call':4,19 'captur':184 'categori':153 'challeng':181 'classif':161 'commit':104 'confirm':185 'connect':140 'content':146 'contract':206 'convers':169 'crawl':128 'data':52,122 'decim':93 'demo':241 'detail':118 'distinct':246 'doc':129 'document':119,221 'embed':162 'endpoint':32,63,151,187,242 'exact':200 'exampl':217 'exchang':165 'feed':164 'financ':57 'function':124 'gate':65 'generat':171 'generic':239 'geocod':167 'howev':209 'includ':154 'infrastructur':60 'json-response' 'key':97 'label':112 'lack':117 'land':224 'learn':56 'limit':100 'list':79,226 'live':189 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':55 'may':236 'metric':155 'micropayment API' 'minimum':103 'network':77 'no-api-key' 'offer':42 'openapi':213 'page':133,225 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':71 'per':3,18,48,83 'platform':40,148 'point':178 'post':192 'post-method' 'premium':5,20,113 'price':80,130,163,177 'prompt':141 'protocol':69 'rate':99,166 'rather':243 'readm':132 'render':135 'report':156 'request':49,84,193 'request/response':216 'requir':105 'resourc':108 'return':126,194 'schema':214 'scheme':201 'sentiment':157 'servic':247 'settl':70,197 'span':51 'specif':107,232 'substant':220 'success':183 'suit':44 'summar':160 'technic':145 'text':159 'unclear':234 'unit':88 'usdc':15,30,73,90,205 'usdc-settlement' 'use':204 'util':61 'valid':168 'via':10,25,66,198 'wallet':139 'wallet-connect':138 'web3':58 'x402':11,26,68,180 'x402 API' 'x402-payment'","prices":[{"id":"944b319c-1ee7-443e-af90-b1c365afba7d","listingId":"fa788402-f7cc-4ed5-a5f1-9bc9b737cd21","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:45.970Z"}],"sources":[{"listingId":"fa788402-f7cc-4ed5-a5f1-9bc9b737cd21","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:45.970Z","lastSeenAt":"2026-04-23T09:00:47.217Z"}],"details":{"listingId":"fa788402-f7cc-4ed5-a5f1-9bc9b737cd21","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/6"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers 16+ endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/6"}],"useCases":["Accessing premium API data without subscription or API key management","Testing x402 payment flows with low-cost per-request pricing","Integrating pay-per-use API calls into agent workflows on Base"],"bestFor":["Developers exploring x402 protocol integrations","Agents needing keyless, pay-per-call API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.85Z"},"updatedAt":"2026-04-23T09:00:47.217Z"}}