{"id":"49d4170f-2b1e-4f8a-b30a-1050eab840c5","shortId":"FaSzGv","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 `/api/v1/cards/67` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform organizes its endpoints into four categories: 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 listed endpoints share the same $0.02 per-request pricing.\n\nNote that the `/api/v1/cards/67` endpoint's actual functionality is not documented beyond the generic label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. The endpoint is confirmed live (returns a valid 402 x402 challenge), but what data or service it returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment-gated","per-request-micropayment","usdc-base-settlement","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC gated endpoint","Base network API","lowpaymentfee"],"warnings":["The specific function of /api/v1/cards/67 ('Premium API Access') is undocumented — it is unclear what data or service is returned upon payment.","No OpenAPI schema, request format, or response examples are available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The broader platform lists many endpoints but none have detailed documentation visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/67","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic title. The actual functionality of /api/v1/cards/67 is entirely unknown. Docs pages render only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,87,159 '000':81 '20':80 '402':216 'Base network API' 'USDC gated endpoint' 'access':45,72,101,181 'actual':170 'advertis':92 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,71,94,180,195 'attach':104 'base':7,24,61,82 'behind':51 'beyond':175 'broader':113 'call':89 'caller':102 'categori':120 'challeng':218 'classif':135 'confirm':211 'connect':201 'content':207 'convers':151 'data':9,26,121,125,221 'doc':192 'document':174 'embed':136 'endpoint':14,31,50,65,117,155,168,209 'estim':146 'exampl':189 'exchang':141 'export':126 'feed':140 'financ':11,28,137 'four':119 'function':171 'gas':145 'gate':3,20,44 'generat':152 'generic':177 'geocod':149 'header':108 'i.e':86 'infrastructure/utilities':148 'insight':127 'instant':100 'json-response' 'key':95 'label':178 'learn':130 'limit':98 'list':68,154 'live':212 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':129 'marketplac':42 'metric':123 'micropay':55 'micropayment API' 'network':62 'note':164 'offer':8,25 'openapi':185 'organ':115 'page':196 'pay-per-request API' 'payment':76,107,228 'per':53,88,161 'per-request':52,160 'per-request-micropayment' 'platform':5,22,91,114 'post-endpoint' 'premium':70,179 'price':139,163,193 'prompt':203 'protocol':40 'quot':144 'rate':97,142 'render':198 'report':124 'request':54,111,162 'request/response':188 'requir':74 'return':213,225 'schema':186 'sentiment':131 'servic':223 'settl':56 'share':156 'simpli':103 'specif':64 'success':227 'summar':134 'text':133 'token':143 'unit':83 'unknown':230 'upon':226 'usdc':58,85 'usdc-base-settlement' 'util':13,30 'valid':150,215 'varieti':48 'wallet':202 'web3':138 'x402':2,19,39,106,217 'x402 API' 'x402-gated':1,18 'x402-payment-gated' 'x402-protocol':38","prices":[{"id":"b37b9eb1-0acc-4644-9840-baa6bccb23b7","listingId":"49d4170f-2b1e-4f8a-b30a-1050eab840c5","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:50.375Z"}],"sources":[{"listingId":"49d4170f-2b1e-4f8a-b30a-1050eab840c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:50.375Z","lastSeenAt":"2026-04-23T02:31:11.458Z"}],"details":{"listingId":"49d4170f-2b1e-4f8a-b30a-1050eab840c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/67 \\\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/67"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/67"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents that autonomously pay for endpoint calls","Accessing a variety of data, AI, finance, and utility services via micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and autonomous agents on Base","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers seeking bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.138Z"},"updatedAt":"2026-04-23T02:31:11.458Z"}}