{"id":"e48ca1c0-7530-4960-b047-ed16aa424cf9","shortId":"YwUa3T","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to various endpoints. The specific endpoint `/api/v1/carts/20` is labeled \"Premium API Access\" and accepts payment in USDC on the Base network. The x402 challenge indicates a maxAmountRequired of 20000 base units of USDC (6 decimals), which equals $0.02 per request.\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.\n\nHowever, the specific functionality of the `/api/v1/carts/20` endpoint is unclear — it does not map to any of the documented API categories on the landing page. No OpenAPI schema, detailed documentation, or example responses are available. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","json-response"],"categories":["commerce","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC gated endpoint","Base network API","lowpaymentfee"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","The endpoint path '/api/v1/carts/20' does not correspond to any documented API category on the landing page","No OpenAPI schema or response examples available","Actual functionality of this specific endpoint is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/20","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/20","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 402 challenge correctly) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example responses, and the specific purpose of /api/v1/carts/20 is undocumented. The docs pages are empty beyond a wallet connect 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'/call':13,30 '0.02':12,29,89,138 '20000':80 '6':85 'Base network API' 'USDC gated endpoint' 'accept':65 'access':51,63 'advertis':95 'ai':107 'analysi':111 'analyt':101 'api':5,15,22,32,42,62,97,143,171,189 'avail':186 'base':8,25,71,81 'broader':93 'categori':98,172 'challeng':75 'classif':114 'commit':151 'connect':198 'content':204 'convers':131 'data':100,104 'decim':86 'detail':180 'doc':188 'document':170,181 'embed':115 'endpoint':54,57,134,159 'equal':88 'estim':125 'exampl':183 'exchang':120 'export':105 'feed':119 'financ':116 'function':155 'gas':124 'gate':50 'generat':132 'geocod':129 'howev':152 'includ':99 'indic':76 'infrastructur':127 'insight':106 'json-response' 'key':16,33,144 'label':60 'land':175 'learn':109 'limit':147 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':108 'map':165 'maxamountrequir':78 'metric':102 'micropayment API' 'minimum':150 'multipl':96 'network':9,26,72 'no-api-key' 'openapi':178 'page':176,193 'pay':2,19,39 'pay-per-call API' 'pay-per-request':1,18,38 'payment':66 'per':3,20,40,90,139 'platform':6,23,43,94 'premium':61 'price':118,136,190 'prompt':200 'protocol':48 'quot':123 'rate':121,146 'readm':192 'render':195 'report':103 'request':4,21,41,91,140 'requir':17,34 'respons':184 'schema':179 'sentiment':110 'specif':56,154 'substant':203 'summar':113 'text':112 'token':122 'unclear':161 'unit':82 'usdc':68,84 'usdc-base-network' 'use':45 'util':128 'valid':130 'various':53 'via':10,27 'wallet':199 'web3':117 'x402':11,28,47,74 'x402 API' 'x402-payment'","prices":[{"id":"bfd50008-5faa-49d2-9ea4-960b69413813","listingId":"e48ca1c0-7530-4960-b047-ed16aa424cf9","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:55.307Z"}],"sources":[{"listingId":"e48ca1c0-7530-4960-b047-ed16aa424cf9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:55.307Z","lastSeenAt":"2026-04-22T16:30:42.392Z"}],"details":{"listingId":"e48ca1c0-7530-4960-b047-ed16aa424cf9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/20 \\\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":"Platform advertises $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/20"},{"claim":"Endpoint described as 'Premium API Access' in x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/carts/20"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic purchasing of API services"],"bestFor":["Developers wanting instant API access without signup","Agents that can settle x402 payments in USDC on Base","Low-volume or sporadic API consumers who prefer pay-per-use"],"notFor":["High-volume consumers needing bulk pricing or subscriptions","Users without access to USDC on the Base network","Anyone needing detailed documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.405Z"},"updatedAt":"2026-04-22T16:30:42.392Z"}}