{"id":"e6eba85b-2624-47f1-b837-ccc9139cad2b","shortId":"jWSJwx","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/49` 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 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 endpoint accepts HTTP POST requests and returns application/json responses.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind `/api/v1/cards/49` (\"Premium API Access\") is unclear and cannot be determined from the available information.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/cards/49 ('Premium API Access') is completely undocumented","No request body schema or response schema available — callers cannot know what to send or expect back","The platform lists many endpoint categories but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/49","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it is operational. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/cards/49 ('Premium API Access') is undefined. This is effectively a stub 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'/request':17,34 '0.02':16,33,76,154 '000':80 '20':79 '402 payment API' '6':86 'Base USDC API' 'accept':161 'access':45,73,217 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,72,97,113,176,216 'application/json':167 'avail':205,226 'base':7,24,61,81 'behind':51,213 'broader':107 'call':78 'cannot':221 'categori':111 'classif':128 'connect':184 'convers':145 'cost':75 'crawl':208 'data':9,26,114,118 'decim':87 'detail':191 'determin':223 'doc':174 'document':169,200 'embed':129 'endpoint':14,31,50,65,148,160 'estim':139 'exact':94 'exampl':204 'exchang':134 'export':119 'extrem':171 'feed':133 'financ':11,28,130 'four':110 'function':212 'gas':138 'gate':3,20,44 'generat':146 'geocod':143 'handl':90 'http':162 'http-post' 'inform':227 'infrastructur':141 'insight':120 'json-api' 'key':98 'learn':123 'limit':101 'list':69,150 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':42 'materi':209 'metric':116 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':179 'pay-per-request API' 'payment':88 'per':53,77,155 'per-request':52 'per-request-micropayment' 'platform':5,22,108 'point':158 'post':163 'premium':71,215 'price':132,157,175 'prompt':186 'protocol':40 'quot':137 'rate':100,135 'readm':178 'render':181 'report':117 'request':54,156,164 'request/response':198 'requir':105 'respons':168 'return':166 'schema':199 'scheme':95 'sentiment':124 'settl':56 'spars':172 'spec':196 'specif':64,211 'subscript':104 'summar':127 'technic':190 'text':126 'token':136 'unclear':219 'unit':82 'usag':203 'usdc':58,84 'usdc-base' 'util':13,30,142 'valid':144 'varieti':48 'via':91 'wallet':185 'web3':131 'x402':2,19,39,93 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"86d2b9f9-b3a2-49cb-bc39-7fd840f94e00","listingId":"e6eba85b-2624-47f1-b837-ccc9139cad2b","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:38.222Z"}],"sources":[{"listingId":"e6eba85b-2624-47f1-b837-ccc9139cad2b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:38.222Z","lastSeenAt":"2026-04-23T04:01:14.254Z"}],"details":{"listingId":"e6eba85b-2624-47f1-b837-ccc9139cad2b","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/49 \\\n  -H 'Content-Type: application/json'\n# Response: 402 with x402 payment challenge\n# After payment via X-PAYMENT header, receive JSON response.","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/49"},{"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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/49"},{"claim":"Docs, pricing, API, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-use API endpoints without managing API keys or subscriptions","Making micropayment-gated API calls settled on Base L2 in USDC","Integrating x402-compatible agents with a multi-category API platform"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that support x402 payment protocol on Base","Projects needing low-cost per-request API calls without signup"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.743Z"},"updatedAt":"2026-04-23T04:01:14.254Z"}}