{"id":"cd4eda9d-d631-40be-a88b-ef3f34fc564e","shortId":"prJvvV","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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/payments/370` 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 — you 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 listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/370` endpoint specifically returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input parameters are expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/payments/370 ('Premium API Access') is undefined — it is unclear what data or service it provides","Cannot verify what the endpoint actually returns upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/370","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/payments/370","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 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what this specific endpoint does beyond the generic label 'Premium API Access'. The listing is effectively a 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'/api/v1/payments/370':60,195 '/docs':164 '/pricing':166 '/readme':168 '/request':13,30,156 '0.02':12,29,82,155 '000':76 '20':75 '402':70,203 'Base network API' 'USDC micropayment API' 'accept':50 'access':66,96 'across':112 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89 'attach':99 'base':8,25,55,77 'broader':108 'call':4,21,84 'categori':114 'challeng':71,204 'classif':129 'confirm':205 'connect':174 'content':180 'convers':146 'crypto-paid API' 'data':115,119 'descript':191 'document':159,208 'embed':130 'endpoint':59,111,149,196,200 'estim':140 'exampl':188 'exchang':135 'expect':216 'export':120 'extrem':161 'feed':134 'financ':131 'four':113 'gas':139 'generat':147 'geocod':144 'header':103 'http-post' 'i.e':81 'infrastructur':142 'input':213 'insight':121 'instant':95 'key':16,33,90 'learn':124 'like':223 'limit':93 'list':62,151 'live':202 'look':222 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'network':9,26,56 'no-api-key' 'offer':110 'openapi':184 'page':169 'paramet':214 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payload':221 'payment':52,102 'per':3,20,40,83 'platform':6,23,43,86,109 'point':158 'premium':64 'premium API access' 'price':133,157 'prompt':176 'protocol':48 'quot':138 'rate':92,136 'render':171 'report':118 'request':41,72,106 'request/response':187 'requir':17,34 'respons':220 'return':68,198 'schema':185 'sentiment':125 'simpli':98 'spars':162 'specif':58,197 'summar':128 'text':127 'token':137 'unclear':211 'unit':78 'usdc':51,80 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':175 'web3':132 'without':207 'x402':11,28,47,101 'x402 API' 'x402-payment'","prices":[{"id":"3c36a87d-dc5f-4f81-afde-f1329ade5df7","listingId":"cd4eda9d-d631-40be-a88b-ef3f34fc564e","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/payments/370","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:41.051Z"}],"sources":[{"listingId":"cd4eda9d-d631-40be-a88b-ef3f34fc564e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/370","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:41.051Z","lastSeenAt":"2026-04-23T20:02:38.607Z"}],"details":{"listingId":"cd4eda9d-d631-40be-a88b-ef3f34fc564e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/370 \\\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/payments/370"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/370"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven API consumption with per-request crypto payments"],"bestFor":["Developers wanting zero-signup API access via crypto payments","AI agents that can attach x402 payment headers autonomously","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk/subscription pricing","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.377Z"},"updatedAt":"2026-04-23T20:02:38.607Z"}}