{"id":"c2eee0af-fff6-412d-8f78-5ba21476add3","shortId":"yNmGFC","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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a signed USDC payment in the X-PAYMENT header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transfers/53` is listed as \"Premium API Access.\" 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 endpoint accepts POST requests and returns application/json. No further documentation about the request body schema or response format for this particular endpoint is available from the crawled material — the docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. All are priced identically at $0.02 per call. Without detailed API documentation or example payloads, the exact capabilities of each endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No API documentation available — docs, pricing, and API pages all show only 'Connect wallet'","No request body schema or response schema documented for this endpoint","The purpose of /api/v1/transfers/53 specifically is unclear; the title 'Premium API Access' is generic","The broader platform lists many endpoint categories but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no examples, and the docs/pricing/API pages all render only a 'Connect wallet' prompt. The specific purpose of /api/v1/transfers/53 beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,59,134,218 '000':122 '0x8335':128 '20':121 '2913':129 '402 payment API' '6':138 'Base network API' 'USDC micropayment API' 'accept':142 'access':113 'advertis':117,186 'ai/ml':49 'analysi':195 'analyt':48 'api':5,20,37,71,112,173,223 'application/json':147 'asset':127 'attach':87 'avail':164 'base':8,23,67,123,131 'bodi':154 'broad':42 'broader':184 'call':4,19,220 'caller':86 'capabl':230 'catalog':43 'categori':187 'challeng':116 'classif':198 'commit':78 'connect':180 'convers':210 'cost':58 'crawl':167 'crypto-paid API' 'data':47,52,191 'decim':139 'detail':222 'doc':170 'document':150,224 'embed':199 'enabl':36 'endpoint':45,57,105,141,162,233 'equal':133 'estim':207 'everi':56 'exact':229 'exampl':226 'exchang':202 'export':192 'feed':201 'finance/web3':51 'format':158 'gas':206 'generat':212 'geocod':208 'given':135 'handl':83 'header':97 'ident':216 'immedi':102 'includ':188 'infer':50 'infrastructur':54 'inlin':85 'insight':193 'json-response' 'key':72 'limit':75 'list':109 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':168 'maxamountrequir':119 'metric':189 'minim':179 'network':9,24,68 'no-api-key' 'offer':40 'page':174 'paid':62 'particular':161 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':227 'payment':84,91,96 'per':3,18,60,219 'platform':6,21,38,185 'post':143 'post-method' 'premium':111 'price':171,200,215 'prompt':182 'protocol':82 'quot':205 'rate':74,203 'receiv':99 'remain':234 'report':190 'request':61,144,153 'requir':79 'resolv':176 'respons':101,157 'return':146 'schema':155 'sentiment':194 'sign':89 'span':46 'specif':104 'summar':197 'text':196 'token':204 'unclear':235 'unit':124 'usdc':15,30,64,90,126,136 'usdc-base-network' 'util':55 'valid':209 'via':10,25 'wallet':181 'without':221 'x':95 'x-payment':94 'x402':11,26,35,81,115 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7aff9852-6bcf-4c63-9d19-de1a1469553a","listingId":"c2eee0af-fff6-412d-8f78-5ba21476add3","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:51.780Z"}],"sources":[{"listingId":"c2eee0af-fff6-412d-8f78-5ba21476add3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:51.780Z","lastSeenAt":"2026-04-22T23:02:17.619Z"}],"details":{"listingId":"c2eee0af-fff6-412d-8f78-5ba21476add3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/53"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without managing API keys or subscriptions","Making one-off data or utility API calls paid per-request in USDC","Integrating pay-as-you-go API access into autonomous agent workflows"],"bestFor":["Developers who want zero-commitment, pay-per-call API access","AI agents that need to autonomously purchase API calls via x402","Users already holding USDC on the Base network"],"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":"2026-02-17T23:13:33.865Z"},"updatedAt":"2026-04-22T23:02:17.619Z"}}