{"id":"763fad4c-88a4-4a82-95cf-f605e237d7d9","shortId":"LmTypC","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 an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transfers/36` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 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 detailed description of what the `/api/v1/transfers/36` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the generic label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose and output of '/api/v1/transfers/36' is unknown beyond the label 'Premium API Access'","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/36","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/transfers/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/transfers/36' ('Premium API Access') is entirely opaque. All doc pages render only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,59,135,171 '000':123 '0x8335':129 '20':122 '2913':130 '402':222 '402 payment protocol' '6':139 'Base network API' 'USDC micropayment API' 'accept':112 'access':110,236 'actual':213 'advertis':118 'ai/ml':49 'also':143 'analysi':148 'analyt':48 'api':5,20,37,71,109,180,235 'asset':128 'attach':87 'base':8,23,67,124,132 'beyond':238 'broad':42 'call':4,19 'caller':86 'challeng':117,223 'classif':151 'collect':43 'commit':79 'connect':189 'content':195 'convers':163 'cost':58 'crypto-paid API' 'data':47,52,165,231 'decim':140 'descript':207 'detail':206 'doc':179 'document':174,226 'embed':152 'enabl':36 'endpoint':45,57,102,145,212,216 'equal':134 'estim':160 'everi':56 'exampl':203 'exchang':155 'expos':144 'extrem':176 'feed':154 'finance/web3':51 'function':233 'gas':159 'generat':166 'generic':240 'geocod':161 'given':136 'handl':83 'header':90 'http':93 'immedi':99 'infer':50 'inlin':85 'json-response' 'key':72 'label':241 'limit':75 'list':106 'live':218 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':120 'network':9,24,68 'no-api-key' 'offer':40 'openapi':199 'page':184 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,89 'per':3,18,60 'platform':6,21,38,142 'point':173 'post':113 'post-endpoint' 'premium':108,234 'price':153,172,181 'prompt':191 'proper':221 'protocol':82 'provid':237 'quot':158 'rate':74,156 'readm':183 'receiv':96 'render':186 'request':61,94,114 'request/response':202 'respons':98 'return':214,219 'schema':200 'sentiment':147 'servic':55 'span':46 'spars':177 'specif':101 'summar':150 'text':149 'token':157 'unclear':229 'unit':125 'upfront':78 'usdc':15,30,64,127,137 'usdc-base-network' 'util':54 'valid':162 'via':10,25 'wallet':190 'without':225 'x402':11,26,35,81,116 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"00852217-7707-40b7-a8ec-b842cc58b74d","listingId":"763fad4c-88a4-4a82-95cf-f605e237d7d9","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/transfers/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:51.781Z"}],"sources":[{"listingId":"763fad4c-88a4-4a82-95cf-f605e237d7d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:51.781Z","lastSeenAt":"2026-04-22T04:02:12.488Z"}],"details":{"listingId":"763fad4c-88a4-4a82-95cf-f605e237d7d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/36 \\\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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/36"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/36"},{"claim":"Docs, API, pricing, and README pages all render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without managing API keys or subscriptions","Agent-driven workflows that need inline micropayment settlement per request","Exploring x402 protocol integration for pay-as-you-go services"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, per-call API access settled in USDC","Low-volume consumers who want zero-commitment pricing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.867Z"},"updatedAt":"2026-04-22T04:02:12.488Z"}}