{"id":"bd6d32e9-9dbe-4ba8-b43d-d27de865ce75","shortId":"XpP9sr","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/carts/81` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The maximum amount required per call is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.\n\nThe broader platform advertises multiple API categories including 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 with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind the `/api/v1/carts/81` endpoint is unclear. The title \"Premium API Access\" is generic and does not describe what data or service is returned. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional documentation. There is no OpenAPI schema, no request/response examples, and no detailed documentation available for any endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API payment"],"warnings":["The specific functionality of /api/v1/carts/81 ('Premium API Access') is not documented anywhere — it is unclear what data or service this endpoint returns.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, no request body schema, and no response examples are available.","The platform lists many endpoint categories (AI, finance, data, etc.) but none have visible documentation confirming they are functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/carts/81 endpoint is entirely unclear. The docs/pricing/README pages are all blank beyond a wallet-connect 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'/call':13,28 '0.02':12,27,93,145 '000':82 '0x8335':87 '20':81 '2913':88 '6':97 'Base network API' 'USDC API' 'accept':46,64 'access':62,174 'addit':202 'advertis':102 'ai':114 'amount':76 'analysi':118 'analyt':108 'api':5,20,38,61,104,150,173 'avail':216 'base':8,23,51,83,90 'behind':164 'broader':100 'call':79 'categori':105 'classif':121 'commit':158 'connect':197 'convers':138 'crypto API payment' 'data':107,111,182 'decim':98 'describ':180 'detail':214 'doc':188 'document':203,215 'embed':122 'endpoint':55,141,167,219 'equal':92 'estim':132 'exact':72 'exampl':211 'exchang':127 'export':112 'feed':126 'financ':123 'function':163 'gas':131 'generat':139 'generic':176 'geocod':136 'given':94 'howev':160 'includ':106 'infrastructur':134 'insight':113 'key':151 'learn':116 'limit':154 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'maximum':75 'metric':109 'micropayment API' 'minimum':157 'multipl':103 'network':9,24,52 'no-api-key' 'openapi':207 'page':192 'pay':2,17,35 'pay per call API' 'pay-per-request':1,16,34 'payment':48,68 'per':3,18,36,78,146 'platform':6,21,39,101,222 'post':65 'post-endpoint' 'premium':60,172 'price':125,143,189 'prompt':199 'protocol':44 'quot':130 'rate':128,153 'readm':191 'report':110 'request':4,19,37,66,147 'request/response':210 'requir':77,159 'return':186,194 'schema':208 'scheme':73 'sentiment':117 'servic':184 'specif':54,162 'summar':120 'text':119 'titl':171 'token':129 'unclear':169 'unit':84 'usdc':15,30,47,86,95 'usdc-base' 'use':41 'util':135 'valid':137 'via':10,25,69 'wallet':198 'web3':124 'x402':11,26,43,71 'x402 API' 'x402-payment'","prices":[{"id":"c5403bee-84cb-4df1-a291-26b83c52d867","listingId":"bd6d32e9-9dbe-4ba8-b43d-d27de865ce75","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:36.666Z"}],"sources":[{"listingId":"bd6d32e9-9dbe-4ba8-b43d-d27de865ce75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:36.666Z","lastSeenAt":"2026-04-23T12:05:07.905Z"}],"details":{"listingId":"bd6d32e9-9dbe-4ba8-b43d-d27de865ce75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/81 \\\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/carts/81"},{"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 platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/81"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility and data endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.494Z"},"updatedAt":"2026-04-23T12:05:07.905Z"}}