{"id":"f2350ae2-9885-4169-a52f-d07ab0825706","shortId":"99XCZB","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/7` 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 protocol — no API keys, accounts, or subscriptions are required; each request is paid for individually with an on-chain USDC transaction.\n\nThe wider platform advertises four endpoint 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/request pricing. The platform claims no rate limits and instant access.\n\nNote that the specific functionality behind `/api/v1/keys/7` (\"Premium API Access\") is not documented beyond its title. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation exists for what /api/v1/keys/7 actually returns upon successful payment","No OpenAPI or request/response schema available","Crawled docs pages (/api, /pricing, /README) all returned only a 'Connect wallet' prompt with no content","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/7","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/keys/7","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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what this specific endpoint does, no request/response schema, no OpenAPI spec, and the crawled pages beyond the landing page are empty. The listing is effectively a 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'/request':19,38,166 '0.02':18,37,79,165 '000':83 '20':82 '402':229 '6':89 'access':74,176,186 'account':101 'actual':234 'addit':219 'advertis':122 'ai':12,31,133 'analysi':137 'analyt':127 'api':5,24,45,73,99,185,208 'base':8,27,63,84 'base network api' 'base-network' 'behind':182 'beyond':190 'broad':50 'call':4,23,81 'catalog':51 'categori':125 'chain':116 'challeng':230 'claim':170 'classif':140 'confirm':224 'connect':214 'convers':157 'cost':76 'crawl':203 'data':11,30,126,130 'decim':90 'detail':220 'doc':204 'document':189 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,161,222 'estim':151 'exampl':200 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'four':123 'function':181 'gas':150 'generat':158 'geocod':155 'handl':93 'individu':111 'infrastructur':153 'insight':132 'instant':175 'json-response' 'key':100 'learn':135 'limit':173 'list':70,160 'live':225 'low payment fee' 'lowpaymentfee.com':39 'machin':134 'metric':128 'micropayment api' 'minim':213 'network':64 'no-api-key' 'note':177 'offer':10,29 'on-chain':114 'openapi':196 'page':205 'paid':109 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,238 'per':3,22,55,80 'platform':6,25,46,121,169 'premium':72,184 'premium api access' 'price':144,167,206 'prompt':216 'protocol':97 'provid':48 'quot':149 'rate':147,172 'readm':207 'report':129 'request':56,107 'request/response':199 'requir':105 'resolv':210 'return':235 'schema':197 'sentiment':136 'settl':58 'share':162 'specif':66,180 'subscript':103 'success':237 'summar':139 'text':138 'titl':192 'token':148 'transact':118 'unit':85 'unknown':240 'upon':236 'usdc':9,28,60,87,117 'usdc api' 'usdc-settlement' 'util':15,34,154 'valid':156,228 'via':94,226 'wallet':215 'web3':143 'wider':120 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e7c2f0d2-cccd-4475-ba28-85b7f8715fcc","listingId":"f2350ae2-9885-4169-a52f-d07ab0825706","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/keys/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.835Z"}],"sources":[{"listingId":"f2350ae2-9885-4169-a52f-d07ab0825706","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.835Z","lastSeenAt":"2026-04-22T01:02:19.266Z"}],"details":{"listingId":"f2350ae2-9885-4169-a52f-d07ab0825706","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/7 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/7"},{"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"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/7"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","On-demand API access where usage is sporadic and subscriptions are wasteful"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base automatically","Low-volume or bursty workloads where per-call pricing is economical"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.146Z"},"updatedAt":"2026-04-22T01:02:19.266Z"}}