{"id":"7352c366-ba31-41c8-bf37-69b566f91a65","shortId":"JRMpPz","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/cards/14` is listed as \"Premium API Access\" and costs $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 endpoints: 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.\n\nHowever, the specific functionality behind `/api/v1/cards/14` is not documented beyond the generic label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, request/response schemas, or usage examples. Without knowing what this particular endpoint returns, agents should treat it as an opaque paid resource until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","json-response","post-method"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 paid API","micropayment API","Base USDC API","pay-per-call API"],"warnings":["No documentation available for /api/v1/cards/14 — the actual response payload and purpose are unknown.","All non-homepage crawled pages (docs, api, pricing, README) returned only 'Connect wallet' with no content.","The endpoint name 'Premium API Access' is generic and does not describe specific functionality.","No OpenAPI spec, no request schema, and no response schema available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/14","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/14","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 402 challenge, confirming it accepts USDC payments on Base. However, there is no documentation of what /api/v1/cards/14 actually returns, no request/response schema, and no examples. The docs, pricing, and README pages are all empty beyond a wallet-connect prompt. The listing is essentially a stub with confirmed liveness but unknown 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'/request':17,34 '0.02':16,33,73,151 '000':77 '20':76 '6':83 'Base USDC API' 'access':70,171 'addit':188 'advertis':106 'agent':203 'ai':10,27,118 'analysi':122 'analyt':112 'api':4,21,41,69,94,170 'base':7,24,59,78 'behind':49,160 'beyond':165 'broader':104 'call':75 'categori':108 'classif':125 'connect':183 'convers':142 'cost':72 'crawl':173 'data':9,26,111,115 'decim':84 'doc':174 'document':164,190,214 'embed':126 'endpoint':14,31,48,63,110,145,201 'estim':136 'exact':91 'exampl':195 'exchang':131 'export':116 'feed':130 'financ':11,28,127 'four':107 'function':159 'gas':135 'gate':3,20,44 'generat':143 'generic':167 'geocod':140 'handl':87 'howev':156 'infrastructur':138 'insight':117 'json-response' 'key':95 'know':197 'label':168 'learn':120 'limit':98 'list':66,147 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'marketplac':42 'metric':113 'micropay':53 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'opaqu':209 'page':178 'paid':210 'particular':200 'pay-per-call API' 'payment':85 'per':51,74,152 'per-request':50 'per-request-micropayment' 'platform':5,22,105 'point':155 'post-method' 'premium':68,169 'price':129,154,175 'prompt':185 'protocol':40 'quot':134 'rate':97,132 'readm':177 'report':114 'request':52,153 'request/response':191 'requir':102 'resourc':211 'return':180,202 'schema':192 'scheme':92 'sentiment':121 'settl':54 'specif':62,158 'subscript':101 'summar':124 'surfac':215 'technic':189 'text':123 'token':133 'treat':205 'unit':79 'usag':194 'usdc':56,81 'usdc-base' 'util':13,30,139 'valid':141 'varieti':46 'via':88 'wallet':184 'web3':128 'without':196 'x402':2,19,39,90 'x402 paid API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9c2227a8-5543-4ebb-b450-621a02c6457c","listingId":"7352c366-ba31-41c8-bf37-69b566f91a65","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:18.907Z"}],"sources":[{"listingId":"7352c366-ba31-41c8-bf37-69b566f91a65","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:18.907Z","lastSeenAt":"2026-04-22T10:01:39.378Z"}],"details":{"listingId":"7352c366-ba31-41c8-bf37-69b566f91a65","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/14 \\\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 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/14"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-compatible agents with a low-cost paid endpoint","Exploring x402 protocol micropayment flows on Base network"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","x402 protocol experimentation and integration testing","Low-cost micropayment API consumption on Base"],"notFor":["Users needing detailed documentation or guaranteed SLAs before purchasing","Use cases requiring known, well-documented response schemas","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.731Z"},"updatedAt":"2026-04-22T10:01:39.378Z"}}