{"id":"5db70c73-a27c-4abd-8161-a477426e2f54","shortId":"LStWSN","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/23` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 offers endpoints across 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 endpoints are uniformly priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/products/23`) is labeled \"Premium API Access\" but the crawled material does not clarify what specific data or functionality it returns beyond the generic title. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional documentation. Without an OpenAPI schema or response examples, the exact request/response format is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment protocol"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality and response format of /api/v1/products/23 ('Premium API Access') is undocumented","All documentation pages (docs, pricing, README) returned only a 'Connect wallet' prompt with no content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/23","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/products/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page, no request/response examples, and the specific functionality of /api/v1/products/23 is unclear. The docs/pricing/README pages are empty beyond a wallet connect 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'/request':13,28 '0.02':12,27,78,150 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,161 'across':108 'addit':195 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,160 'attach':95 'base':8,23,51,73 'beyond':176 'broader':104 'call':4,19,80 'caller':93 'categori':110 'challeng':67 'clarifi':168 'classif':125 'connect':190 'convers':142 'crawl':164 'data':111,115,171 'doc':181 'document':196 'embed':126 'endpoint':55,107,145,155 'estim':136 'exact':205 'exampl':203 'exchang':131 'export':116 'feed':130 'financ':127 'format':207 'four':109 'function':173 'gas':135 'generat':143 'generic':178 'geocod':140 'header':99 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'label':158 'learn':120 'limit':89 'list':58 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'materi':165 'metric':113 'network':9,24,52 'no-api-key' 'offer':106 'openapi':199 'page':185 'particular':154 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'premium':60,159 'price':129,148,182 'prompt':192 'protocol':44 'quot':134 'rate':88,132 'readm':184 'render':187 'report':114 'request':37,68,102,152 'request/response':206 'respons':202 'return':64,175 'schema':200 'sentiment':121 'simpli':94 'specif':54,170 'summar':124 'text':123 'titl':179 'token':133 'uniform':147 'unit':74 'unknown':209 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':191 'web3':128 'without':197 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"20a9bc54-53bb-40a6-a1b4-4f92be3d31f1","listingId":"5db70c73-a27c-4abd-8161-a477426e2f54","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/products/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:44.589Z"}],"sources":[{"listingId":"5db70c73-a27c-4abd-8161-a477426e2f54","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:44.589Z","lastSeenAt":"2026-04-23T17:31:06.681Z"}],"details":{"listingId":"5db70c73-a27c-4abd-8161-a477426e2f54","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/23 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/23"},{"claim":"The platform advertises $0.02/request pricing 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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/23"}],"useCases":["Accessing premium API data without signing up for an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 USDC payments","Integrating pay-as-you-go API access into workflows on the Base network"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or sporadic API usage where subscriptions are unnecessary"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.899Z"},"updatedAt":"2026-04-23T17:31:06.681Z"}}