{"id":"eb7539a5-20c3-4dd1-bbff-227c19342072","shortId":"FgvSYP","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/94` 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/request price point. The x402 challenge confirms the endpoint is live and accepts POST requests returning application/json.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality behind `/api/v1/cards/94` (labeled generically as \"Premium API Access\") is unclear and does not map obviously to any of the listed API categories.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No OpenAPI spec or schema available for request or response","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The endpoint path /api/v1/cards/94 is not listed among the site's advertised APIs — its actual functionality is unknown","No request body schema or response examples could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/94","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this specific endpoint does, no request/response schemas, and no examples. The endpoint path '/api/v1/cards/94' does not correspond to any documented API category. This is effectively a stub 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'/request':17,34,157 '0.02':16,33,78,156 '000':82 '20':81 '6':88 'Base network API' 'USDC API access' 'accept':169 'access':45,73,225 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,180,224,238 'application/json':173 'avail':210 'base':7,24,61,83 'behind':51,218 'broader':109 'call':80 'categori':113,239 'challeng':162 'classif':130 'confirm':163 'connect':189 'content':214 'convers':147 'cost':75 'crawl':213 'data':9,26,116,120 'decim':89 'detail':196 'doc':179 'document':174,205 'embed':131 'endpoint':14,31,50,65,150,165 'estim':141 'exact':96,216 'exampl':209 'exchang':136 'export':121 'extrem':176 'feed':135 'financ':11,28,132 'four':112 'function':217 'gas':140 'gate':3,20,44 'generat':148 'generic':221 'geocod':145 'handl':92 'infrastructur':143 'insight':122 'json-api' 'key':100 'label':220 'learn':125 'limit':103 'list':69,152,237 'live':167 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'map':231 'marketplac':42 'metric':118 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'obvious':232 'offer':8,25 'openapi':200 'page':184 'pay-per-request API' 'payment':90 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'point':159 'post':170 'post-endpoint' 'premium':71,223 'price':134,158,181 'prompt':191 'protocol':40 'quot':139 'rate':102,137 'readm':183 'render':186 'report':119 'request':54,171 'request/response':203 'requir':107 'return':172 'schema':204 'scheme':97 'sentiment':126 'settl':56 'spars':177 'spec':201 'specif':64 'subscript':106 'summar':129 'technic':195 'text':128 'token':138 'unclear':227 'unit':84 'usag':208 'usdc':58,86 'usdc-base' 'util':13,30,144 'valid':146 'varieti':48 'via':93 'wallet':190 'web3':133 'x402':2,19,39,95,161 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"92a856f2-22ff-4ba6-854e-75e7ba2f431e","listingId":"eb7539a5-20c3-4dd1-bbff-227c19342072","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/94","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:00.731Z"}],"sources":[{"listingId":"eb7539a5-20c3-4dd1-bbff-227c19342072","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/94","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:00.731Z","lastSeenAt":"2026-04-23T03:01:28.413Z"}],"details":{"listingId":"eb7539a5-20c3-4dd1-bbff-227c19342072","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing a valid X-PAYMENT header (USDC on Base, up to $0.02):\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/94 \\\n  -H 'X-PAYMENT: <signed-x402-payment-token>' \\\n  -H 'Content-Type: application/json'","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/94"},{"claim":"All listed APIs are priced at $0.02/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 API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/94"}],"useCases":["Accessing premium API endpoints without traditional API key management","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use data, AI, or finance APIs into agent workflows"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction access to miscellaneous utility APIs"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing over per-call fees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.626Z"},"updatedAt":"2026-04-23T03:01:28.413Z"}}