{"id":"0f3f72ea-9353-4e9e-bbdf-6d8b61bd07b9","shortId":"fe5DhF","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 at `/api/v1/cards/37` 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 sign-up required. Callers simply attach an X-PAYMENT header with a valid payment proof.\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\nThe specific functionality behind `/api/v1/cards/37` is not documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found during the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content. This makes it difficult to determine what data or service this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","json-response"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","Base USDC API","premium API access"],"warnings":["The specific functionality of /api/v1/cards/37 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body format, or response examples were found.","All documentation pages (docs, pricing, API, README) rendered only 'Connect wallet' with no useful content.","The platform lists many endpoint categories but it is unclear whether all are actually functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/37","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/37","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), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of /api/v1/cards/37 is entirely opaque beyond the generic 'Premium API Access' label. Docs pages returned only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,76,169 '000':80 '20':79 '6':86 'Base USDC API' 'access':71,187 'advertis':124 'ai':10,27,136 'analysi':140 'analyt':130 'api':4,21,41,70,97,186,206 'attach':110 'base':7,24,59,81 'behind':49,177 'beyond':182 'broader':122 'call':78 'caller':108 'categori':126 'classif':143 'connect':212 'content':218 'convers':160 'cost':73 'crawl':201 'data':9,26,129,133,226 'decim':87 'detail':195 'determin':224 'difficult':222 'doc':203 'document':181,196 'embed':144 'endpoint':14,31,48,63,128,163,231 'estim':154 'exact':94 'exampl':193 'exchang':149 'export':134 'feed':148 'financ':11,28,145 'found':198 'four':125 'function':176 'gas':153 'gate':3,20,44 'generat':161 'generic':184 'geocod':158 'handl':90 'header':115 'infrastructur':156 'insight':135 'json-response' 'key':98 'label':188 'learn':138 'limit':101 'list':67,165 'low payment fee' 'lowpaymentfee.com':35 'machin':137 'make':220 'marketplac':42 'metric':131 'micropay':53 'micropayment API' 'network':60 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':190 'page':207 'particular':230 'pay-per-request API' 'payment':88,114,119 'per':51,77,170 'per-request':50 'per-request-micropayment' 'platform':5,22,123 'point':173 'premium':69,185 'premium API access' 'price':147,172,204 'prompt':214 'proof':120 'protocol':40 'quot':152 'rate':100,150 'render':209 'report':132 'request':52,171 'request/response':192 'requir':107 'return':232 'schema':191 'scheme':95 'sentiment':139 'servic':228 'settl':54 'sign':105 'sign-up':104 'simpli':109 'specif':62,175 'summar':142 'text':141 'token':151 'unit':82 'usdc':56,84 'usdc-base' 'util':13,30,157 'valid':118,159 'varieti':46 'via':91 'wallet':213 'web3':146 'x':113 'x-payment':112 'x402':2,19,39,93 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2f0c2c36-1a45-4f2e-8fe3-70f7d28cf7f8","listingId":"0f3f72ea-9353-4e9e-bbdf-6d8b61bd07b9","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:30.389Z"}],"sources":[{"listingId":"0f3f72ea-9353-4e9e-bbdf-6d8b61bd07b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:30.389Z","lastSeenAt":"2026-04-22T10:01:39.890Z"}],"details":{"listingId":"0f3f72ea-9353-4e9e-bbdf-6d8b61bd07b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/37"},{"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 offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing an API key or subscription","Integrating x402-compatible agents with a low-cost endpoint marketplace","Accessing data, AI, finance, or utility services via micropayments on Base"],"bestFor":["Agents or developers wanting zero-signup, pay-as-you-go API access","x402-native workflows that settle in USDC on Base","Low-volume or experimental use cases where $0.02/call is acceptable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing may add up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.101Z"},"updatedAt":"2026-04-22T10:01:39.890Z"}}