{"id":"4d547e69-595c-42e2-a482-4657a829371e","shortId":"2AkMLB","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/76` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02 per request price point. The x402 challenge confirms the endpoint is live and accepts POST requests.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/cards/76` endpoint specifically returns. The endpoint name \"Premium API Access\" is generic and does not clarify its function. Prospective users should be aware that without documentation, the actual behavior of this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific function of /api/v1/cards/76 ('Premium API Access') is undefined and cannot be determined from available material","No examples of expected input or output"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/76","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/cards/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual function (\"Premium API Access\" on /cards/76) is completely opaque. The docs pages render only wallet-connect 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'/request':17,34 '0.02':16,33,78,156 '000':82 '20':81 '402 payment api' '6':88 'accept':170 'access':45,73,219 'actual':237 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,180,218 'awar':232 'base':7,24,61,83 'base network api' 'behavior':238 'behind':51 'broader':109 'call':80 'categori':113 'challeng':163 'clarifi':225 'classif':130 'confirm':164 'connect':188 'convers':147 'cost':75 'data':9,26,116,120 'decim':89 'descript':206 'detail':195 'doc':178 'document':173,235 'embed':131 'endpoint':14,31,50,65,150,166,211,215,241 'estim':141 'exact':96 'exampl':203 'exchang':136 'export':121 'extrem':175 'feed':135 'financ':11,28,132 'four':112 'function':227 'gas':140 'gate':3,20,44 'generat':148 'generic':221 'geocod':145 'handl':92 'infrastructur':143 'insight':122 'key':100 'learn':125 'limit':103 'list':69,152 'live':168 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'marketplac':42 'metric':118 'micropay':55 'micropayment api' 'name':216 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':199 'page':183 'pay-per-request api' 'payment':90 'per':53,79,157 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':160 'post':171 'post-endpoint' 'premium':71,217 'price':134,159,179 'prompt':190 'prospect':228 'protocol':40 'quot':139 'rate':102,137 'readm':182 'render':185 'report':119 'request':54,158,172 'request/response':202 'requir':107 'return':213 'schema':200 'scheme':97 'sentiment':126 'settl':56 'spars':176 'specif':64,212 'subscript':106 'summar':129 'technic':194 'text':128 'token':138 'unit':84 'unknown':243 'usdc':58,86 'usdc api access' 'usdc-base' 'user':229 'util':13,30,144 'valid':146 'varieti':48 'via':93 'wallet':189 'web3':133 'without':234 'x402':2,19,39,95,162 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"3628eb68-9252-4073-97c4-ee2992e5063d","listingId":"4d547e69-595c-42e2-a482-4657a829371e","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/cards/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:46.108Z"}],"sources":[{"listingId":"4d547e69-595c-42e2-a482-4657a829371e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:46.108Z","lastSeenAt":"2026-04-23T02:31:11.129Z"}],"details":{"listingId":"4d547e69-595c-42e2-a482-4657a829371e","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/76 \\\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/cards/76"},{"claim":"All listed endpoints cost $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 offers APIs in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Integrating x402-compatible agents with on-chain micropayments on Base","Accessing data, AI, finance, or utility endpoints via USDC micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402 payment capability on Base","Users who prefer crypto-native API billing without accounts"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.304Z"},"updatedAt":"2026-04-23T02:31:11.129Z"}}