{"id":"e50db116-7f2d-4956-93ea-c876b4e07009","shortId":"tZEwLB","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The platform requires no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/68` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it is live, accepting POST requests with an exact-scheme payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities — all at the same $0.02 price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual input/output schemas and detailed behavior of each endpoint remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content","The specific purpose and input/output schema of /api/v1/products/68 is unknown; 'Premium API Access' is a generic label","No OpenAPI spec or example responses are provided by the platform","Cannot verify what data or functionality any of the advertised endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/68","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/68","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 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty ('Connect wallet' only). The purpose of '/api/v1/products/68' specifically is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/request':13,32 '0.02':12,31,69,145,189 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':139 '20':133 '2913':140 '300':155 '402 payment api' 'accept':123 'access':112 'across':53 'actual':210 'addit':162 'address':151 'advertis':161 'ai':56 'analysi':166 'analyt':55 'api':5,17,24,36,45,83,111 'application/json':115 'attach':94 'base':8,27,77,135,142 'base network api' 'behavior':215 'broader':159 'call':4,23 'caller':92 'categori':63 'challeng':118 'classif':169 'commit':91 'confirm':119 'connect':201 'content':207 'convers':181 'data':54 'detail':214 'doc':195 'document':193 'embed':170 'enabl':44 'endpoint':52,65,104,163,218 'equal':144 'estim':178 'exact':129 'exact-schem':128 'exchang':173 'feed':172 'financ':59 'gas':177 'generat':183 'geocod':179 'header':98 'howev':192 'includ':164 'infrastructure/utility':62 'input/output':211 'json-response' 'key':18,37,84 'learn':58 'limit':87 'list':108 'live':122 'low payment fee' 'lowpaymentfee.com':39 'machin':57 'marketplac':46 'micropayment api' 'network':9,28,78 'no-api-key' 'offer':48 'page':194 'paid':72 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97,131,147 'per':3,22,70 'platform':6,25,80,160 'point':191 'post':124 'post-method' 'premium':110 'price':67,171,190,196 'prompt':203 'quot':176 'rate':86,174 'readm':197 'remain':219 'request':71,101,125 'requir':19,38,81 'return':114,198 'schema':212 'scheme':130 'second':156 'sent':149 'sentiment':165 'simpli':93 'specif':103 'substant':206 'summar':168 'text':167 'timeout':157 'token':175 'undocu':220 'unit':136 'upfront':90 'usdc':15,34,74,138 'usdc api' 'usdc-base-network' 'util':184 'valid':180 'varieti':50 'via':10,29 'wallet':202 'web3':60 'x402':11,30,43,96,117 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"9169237f-9bd2-4865-b83b-21b45723aeb8","listingId":"e50db116-7f2d-4956-93ea-c876b4e07009","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:26.729Z"}],"sources":[{"listingId":"e50db116-7f2d-4956-93ea-c876b4e07009","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:26.729Z","lastSeenAt":"2026-04-23T20:31:56.055Z"}],"details":{"listingId":"e50db116-7f2d-4956-93ea-c876b4e07009","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/68 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/68"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, README) contain no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API key management","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call billing","Testing x402 payment flows on Base network at low cost"],"bestFor":["Developers or agents wanting zero-setup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs","Consumers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.658Z"},"updatedAt":"2026-04-23T20:31:56.055Z"}}