{"id":"29e96b45-84d8-469b-828b-247c5d18410e","shortId":"W5SYSa","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/carts/66` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The specific purpose of the `/api/v1/carts/66` endpoint is unclear — it does not map to any of the named API categories on the landing page, and \"Premium API Access\" is a generic label. Without documentation or example responses, it is impossible to confirm what data or functionality this endpoint provides.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["data","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api payment","serverless api marketplace"],"warnings":["No OpenAPI spec or schema documentation available","The /docs, /pricing, /api, and /README pages are empty (only show 'Connect wallet')","The endpoint path /api/v1/carts/66 does not match any of the documented API categories on the landing page","No request body schema or response examples are available anywhere","The actual functionality behind 'Premium API Access' is unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/66","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/carts/66","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 returns a valid x402 challenge, and the landing page lists a catalog of endpoints with pricing. However, there is no OpenAPI spec, no documentation beyond the landing page, no request/response examples, and the specific /api/v1/carts/66 endpoint doesn't correspond to any documented API. Effectively a stub 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'/api/v1/carts/66':112,214 '/call':19,38 '/docs':174 '/pricing':176 '/readme':178 '0.02':18,37,99,141 '000':130 '0x8335':135 '20':129 '2913':136 'access':118,163,236 'across':58 'actual':207 'advertis':161 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,151,227,235 'base':8,27,107,131,138 'base usdc api' 'broad':50 'catalog':51 'categori':60,228 'challeng':124 'classif':75 'classification' 'commit':168 'confirm':250 'connect':184 'content':190 'convers':92 'crypto api payment' 'data':11,30,61,65,252 'data-analytics' 'document':169,199,242 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,206,215,256 'equal':140 'estim':86 'exact':148 'exampl':202,244 'exchang':81 'export':66 'extrem':171 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':254 'gas':85 'generat':93 'generic':239 'geocod':90 'geocoding' 'imposs':248 'infrastructur':88 'insight':67 'instant':162 'key':152 'label':240 'land':231 'learn':70 'limit':156 'list':114 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':144 'map':221 'maxamountrequir':127 'metric':63 'micropayment api' 'minimum':166 'name':226 'network':108 'no-api-key' 'offer':48 'openapi':194 'page':179,232 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':142 'per':3,22,55,100 'platform':6,25,46,160 'premium':116,234 'price':79,97 'prompt':186 'provid':257 'purpos':211 'quot':84 'rate':82,155 'render':181 'report':64 'request':4,23,56,101 'request/response':197 'requir':158 'respons':245 'return':120,208 'schema':198 'scheme':149 'sentiment':71 'sentiment-analysis' 'serverless api marketplace' 'spars':172 'spec':195 'specif':110,210 'subscript':153 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':217 'unit':132 'usdc':104,134 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91,122 'via':9,28,145 'wallet':185 'web3':78 'without':241 'x402':10,29,43,123,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"dc165f43-eede-4aa7-bbb4-ca58465603d8","listingId":"29e96b45-84d8-469b-828b-247c5d18410e","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/carts/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:48.722Z"}],"sources":[{"listingId":"29e96b45-84d8-469b-828b-247c5d18410e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:48.722Z","lastSeenAt":"2026-04-23T17:31:09.970Z"}],"details":{"listingId":"29e96b45-84d8-469b-828b-247c5d18410e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/66 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/66"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing lightweight API calls without subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.654Z"},"updatedAt":"2026-04-23T17:31:09.970Z"}}