{"id":"f3feafb9-ec18-49b0-af59-914bc21f8310","shortId":"QCMhCE","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/transfers/49` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is handled via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The actual functionality behind the `/api/v1/transfers/49` path is unclear — the name \"Premium API Access\" and the path segment \"transfers\" do not map to any of the advertised API categories. Without documentation or example responses, it is impossible to confirm what data or service this specific endpoint returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API","crypto payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation is available for any endpoint.","The endpoint path '/api/v1/transfers/49' does not correspond to any of the advertised API categories on the landing page — its actual functionality is unknown.","No example request or response payloads are available to confirm what data this endpoint returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/49","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/49","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 it is operational. However, documentation is effectively nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint (/api/v1/transfers/49) is unclear. The listing is essentially a stub with confirmed liveness and 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'/api/v1/transfers/49':112,223 '/docs':188 '/pricing':189 '/readme':192 '/request':19,38 '0.02':18,37,99,139 '000':128 '0x8335':133 '20':127 '2913':134 '300':172 '402':122 'Base network API' 'USDC API' 'access':118,231 'across':58 'actual':219 'advertis':244 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,150,230,245 'attach':158 'avail':182 'base':8,27,107,129,136 'behind':221 'broad':50 'call':4,23 'caller':156 'catalog':51 'categori':60,246 'challeng':123 'classif':75 'classification' 'confirm':256 'connect':198 'content':204 'convers':92 'crypto payment API' 'data':11,30,61,65,258 'data-analytics' 'document':174,213,248 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,183,263 'equal':138 'estim':86 'exact':146 'exampl':217,250 'exchang':81 'export':66 'extrem':176 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':220 'gas':85 'generat':93 'geocod':90 'geocoding' 'handl':142 'header':163 'imposs':254 'infrastructur':88 'insight':67 'key':151 'land':179 'learn':70 'limit':154 'list':114,181 'low fee API' 'lowpaymentfee.com':39 'machin':69 'map':239 'metric':63 'micropayment API' 'name':228 'network':108 'no-api-key' 'offer':48 'openapi':208 'page':180,193 'paid':102 'path':224,234 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':140,162,169 'per':3,22,55,100 'platform':6,25,46 'post':166 'premium':116,229 'price':79,97,185 'prompt':200 'quot':84 'rate':82,153 'render':195 'report':64 'request':56,101,124,167 'request/response':211 'requir':155 'respons':251 'return':120,264 'schema':212 'scheme':147 'second':173 'segment':235 'sentiment':71 'sentiment-analysis' 'serverless API' 'servic':260 'simpli':157 'spars':177 'spec':209 'specif':110,262 'summar':74 'text':73 'text-summarization' 'timeout':170 'token':83 'transfer':236 'unclear':226 'unit':130 'usag':216 'usdc':104,132 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,143 'wallet':199 'web3':78 'without':247 'x':161 'x-payment':160 'x402':10,29,43,145 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b58b19be-b058-4700-8ed7-533798084f75","listingId":"f3feafb9-ec18-49b0-af59-914bc21f8310","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:59.080Z"}],"sources":[{"listingId":"f3feafb9-ec18-49b0-af59-914bc21f8310","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:59.080Z","lastSeenAt":"2026-04-22T15:02:25.791Z"}],"details":{"listingId":"f3feafb9-ec18-49b0-af59-914bc21f8310","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/49 \\\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 are priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/49"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access with volume discounts","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.51Z"},"updatedAt":"2026-04-22T15:02:25.791Z"}}