{"id":"852fa486-b533-455c-9748-957a3e0fb2d0","shortId":"CZxAsV","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 suite 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 upfront commitments. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request, and the server fulfills the call once payment is verified.\n\nThe specific endpoint at `/api/v1/transfers/102` 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. Beyond this particular path, the platform advertises 16+ endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation).\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what request body the `/api/v1/transfers/102` endpoint expects or what its response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","crypto-paid API","no-auth API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The purpose and expected input of /api/v1/transfers/102 specifically is undocumented","No SLA, uptime, or rate-limit guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/102","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and the landing page lists available endpoints with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The specific purpose of /api/v1/transfers/102 ('Premium API Access') is unclear. This is effectively a stub 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'/api/v1/transfers/102':109,250 '/docs':198 '/pricing':200 '/readme':202 '/request':13,28 '0.02':12,27,59,136 '000':124 '0x8335':130 '16':157 '20':123 '2913':131 '402':237 '6':140 'Base network API' 'USDC micropayment API' 'accept':144 'access':115 'across':159 'advertis':119,156 'ai':168 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':172 'analyt':48,163 'api':5,20,37,71,114 'application/json':149 'asset':129 'attach':87 'avail':228 'base':8,23,67,125,133 'beyond':150 'bodi':248 'broad':42 'call':4,19,100 'caller':86 'captur':239 'categori':161 'challeng':118,238 'classif':175 'commit':79 'confirm':235 'connect':208 'content':214 'convers':191 'conversion' 'cost':58 'crawl':231 'crypto-gas' 'crypto-paid API' 'data':47,52,162 'data-analytics' 'decim':141 'document':193,223,242 'embed':176 'enabl':36 'endpoint':45,57,107,143,158,233,251 'equal':135 'estim':186 'everi':56 'exampl':227 'exchang':181 'exchange-rates' 'expect':252 'export':166 'extrem':195 'feed':180 'financ':177 'finance-prices' 'finance/web3':51 'four':160 'fulfil':98 'gas':185 'generat':192 'geocod':189 'geocoding' 'given':137 'handl':83 'header':90 'http':93 'infer':50 'infrastructur':54,188 'inlin':85 'insight':167 'key':72 'learn':170 'like':259 'limit':75 'list':111 'live':236 'look':258 'low payment fee' 'lowpaymentfee.com':31 'machin':169 'maxamountrequir':121 'metric':164 'network':9,24,68 'no-auth API' 'offer':40 'openapi':218 'page':203 'paid':62 'particular':152 'path':153 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payload':257 'payment':84,89,102 'per':3,18,60 'platform':6,21,38,155 'post':145 'premium':113 'price':179 'prompt':210 'protocol':82 'quot':184 'rate':74,182 'render':205 'report':165 'request':61,94,146,247 'request/response':221 'respons':256 'return':148 'schema':222 'sentiment':171 'server':97 'span':46 'spars':196 'spec':219 'specif':106 'suit':43 'summar':174 'text':173 'token':183 'unclear':245 'unit':126 'upfront':78 'usag':226 'usdc':15,30,64,128,138 'usdc-base' 'util':55 'valid':190 'validation' 'verifi':104 'via':10,25 'wallet':209 'web3':178 'without':241 'x402':11,26,35,81,117 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b01e3760-42f1-4a19-9c2f-a75e1cc08b0e","listingId":"852fa486-b533-455c-9748-957a3e0fb2d0","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/102","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:26.414Z"}],"sources":[{"listingId":"852fa486-b533-455c-9748-957a3e0fb2d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/102","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:26.414Z","lastSeenAt":"2026-04-22T10:32:25.983Z"}],"details":{"listingId":"852fa486-b533-455c-9748-957a3e0fb2d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/102 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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":"The platform offers 16+ endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/102"},{"claim":"The /docs, /api, /pricing, and /README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto price feeds, exchange rates, or gas estimates with per-call USDC payment","Running geocoding, data validation, or format conversion as utility microservices","Exporting analytics data or generating insights reports on a pay-as-you-go basis"],"bestFor":["AI agents or bots that can settle USDC payments on Base via x402","Developers who want zero-signup, pay-per-use API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-throughput production workloads needing SLA guarantees (no documented rate limits or uptime commitments)","Users who need detailed API documentation or request/response schemas before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.039Z"},"updatedAt":"2026-04-22T10:32:25.983Z"}}