{"id":"cf16d36b-40c8-4290-9748-8d9a3d404003","shortId":"KT4gFJ","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 collection of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/26` 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 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/request price point. However, the specific functionality behind the `/api/v1/cards/26` path is not documented — the description simply says \"Premium API Access\" with no further detail on what data or service it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no explanation of what the `/cards/26` endpoint actually does. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is difficult to know what to expect from a successful paid request.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/cards/26 ('Premium API Access') is completely undocumented; it is unclear what data or service it provides.","No OpenAPI or output schema beyond the basic x402 challenge metadata.","No request body schema or response examples are available anywhere in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/26","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is zero documentation on what /api/v1/cards/26 actually returns. No OpenAPI schema, no request/response examples, and all doc pages are blank beyond a wallet-connect prompt. The listing is effectively a 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'/api/v1/cards/26':65,164 '/cards/26':223 '/docs':192 '/pricing':194 '/readme':196 '/request':17,34,155 '0.02':16,33,76,154 '000':80 '20':79 '402':234 '402 payment API' '6':86 'Base USDC API' 'access':71,175 'actual':225 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,70,97,174 'base':7,24,59,81 'behind':49,162 'broader':107 'call':78 'categori':111 'challeng':236 'classif':128 'collect':46 'connect':202 'content':208 'convers':145 'cost':73 'data':9,26,114,118,182 'decim':87 'descript':170 'detail':179 'difficult':242 'document':168,187,239 'embed':129 'endpoint':14,31,48,63,113,148,224,228 'estim':139 'exact':94 'exampl':216 'exchang':134 'expect':247 'explan':219 'export':119 'extrem':189 'feed':133 'financ':11,28,130 'four':110 'function':161 'gas':138 'gate':3,20,44 'generat':146 'geocod':143 'handl':90 'howev':158 'infrastructur':141 'insight':120 'json-response' 'key':98 'know':244 'learn':123 'limit':101 'list':67,150 'live':230 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':42 'metric':116 'micropay':53 'network':60 'offer':8,25 'openapi':212 'page':197 'paid':251 'path':165 'pay-per-request API' 'payment':88 'per':51,77 'per-request':50 'per-request-micropayment' 'platform':5,22,108 'point':157 'post-method' 'premium':69,173 'price':132,156 'prompt':204 'proper':233 'protocol':40 'quot':137 'rate':100,135 'render':199 'report':117 'request':52,252 'request/response':215 'requir':105 'return':186,231 'say':172 'schema':213 'scheme':95 'sentiment':124 'servic':184 'settl':54 'simpli':171 'spars':190 'specif':62,160 'subscript':104 'substant':207 'success':250 'summar':127 'text':126 'token':136 'unit':82 'usdc':56,84 'usdc-base' 'util':13,30,142 'valid':144 'via':91 'wallet':203 'web3':131 'without':238 'x402':2,19,39,93,235 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"05cf1dea-bc47-4fa1-a58b-cb9f5f533753","listingId":"cf16d36b-40c8-4290-9748-8d9a3d404003","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:21.971Z"}],"sources":[{"listingId":"cf16d36b-40c8-4290-9748-8d9a3d404003","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:21.971Z","lastSeenAt":"2026-04-23T06:04:06.036Z"}],"details":{"listingId":"cf16d36b-40c8-4290-9748-8d9a3d404003","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/26 \\\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/26"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/cards/26"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without API keys or subscriptions","Exploring x402-protocol pay-per-use endpoint patterns"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production workloads requiring well-documented, stable contracts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.532Z"},"updatedAt":"2026-04-23T06:04:06.036Z"}}