{"id":"a4e3551a-e7dd-4284-8c2a-90af4835f086","shortId":"ZegzCy","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering 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 endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are 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/transfers/41` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. The payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\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. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior and response schemas of individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["ai","finance","data","utility"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","402 payment API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty, showing only 'Connect wallet'","No OpenAPI or schema available — request/response formats are unknown","The specific endpoint '/api/v1/transfers/41' does not match any of the advertised API paths on the landing page, making its actual function unclear","No SLA, rate limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/41","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/41","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, but documentation is effectively nonexistent — every doc/pricing/API page just shows 'Connect wallet'. There is no OpenAPI spec, no response schema, no example requests or responses, and the purpose of this specific '/transfers/41' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':19,38 '0.02':18,37,70,132 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':126 '300':150 '402':121 '402 payment API' '6':137 'Base network API' 'USDC API' 'accept':155 'access':117 'actual':210 'address':146 'advertis':164 'ai':12,31,57 'ai-inference' 'analysi':173 'analyt':56 'api':5,24,45,88,116 'application/json':160 'attach':99 'base':8,27,78,128,140 'behavior':211 'beyond':193 'broad':50 'broader':162 'call':4,23 'caller':97 'catalog':51 'categori':165 'challeng':122 'classif':176 'classification' 'commit':96 'connect':206 'convers':188 'cover':10,29 'crypto-quotes' 'data':11,30,55,169 'data-analytics' 'decim':138 'document':192 'embed':177 'embeddings' 'empti':199 'enabl':44 'endpoint':16,35,53,66,109,154,217 'essenti':198 'estim':185 'everi':65 'exchang':180 'export':170 'feed':179 'financ':13,32,60 'finance-data' 'gas':184 'generat':190 'geocod':186 'geocoding' 'header':103 'howev':191 'includ':166 'individu':216 'infrastructur':63 'insight':171 'key':89 'land':195 'learn':59 'limit':92 'list':113 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'made':144 'metric':167 'micropayment API' 'network':79 'offer':48 'page':196,203 'pay':2,21 'pay per call API' 'pay-per-cal':1,20 'pay-per-request' 'payment':83,102,142 'per':3,22,71 'platform':6,25,46,163 'post':156 'premium':115 'price':68,178 'protocol':84 'quot':183 'rate':91,181 'report':168 'request':72,106,123,157 'respons':213 'return':119,159 'schema':214 'second':151 'sentiment':172 'sentiment-analysis' 'settl':73 'show':205 'simpli':98 'sinc':134 'span':54 'specif':108 'sub':202 'sub-pag':201 'summar':175 'text':174 'text-summarization' 'timeout':152 'token':182 'unit':129 'unknown':219 'upfront':95 'usd':133 'usdc':9,28,75,131,135 'usdc-base' 'use':136 'util':15,34,64 'utility-apis' 'valid':187 'via':80 'wallet':207 'web3':61 'x402':43,82,101 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"051b92eb-a265-4163-a2b3-29f90580c588","listingId":"a4e3551a-e7dd-4284-8c2a-90af4835f086","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:42.785Z"}],"sources":[{"listingId":"a4e3551a-e7dd-4284-8c2a-90af4835f086","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:42.785Z","lastSeenAt":"2026-04-22T09:01:48.433Z"}],"details":{"listingId":"a4e3551a-e7dd-4284-8c2a-90af4835f086","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/41 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transfers/41"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting data or generating analytics reports on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API categories","Developers wanting to avoid subscription commitments for low-volume API usage","Web3-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, response schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.285Z"},"updatedAt":"2026-04-22T09:01:48.433Z"}}