{"id":"ce346079-08e4-4ee1-a016-ea75dfdcd477","shortId":"YX5AXu","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 suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, 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 minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/transfers/67` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The platform advertises four categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints appear to use the same pricing model.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. 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 difficult to know what request body to send or what response to expect for this particular transfer endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"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) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/transfers/67 is undocumented — 'Premium API Access' is vague","No request body schema or response schema is documented; callers must guess at the expected input"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/67","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/67","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 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of '/api/v1/transfers/67' is unclear beyond the generic 'Premium API Access' 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'/api/v1/transfers/67':116 '/docs':197 '/pricing':199 '/readme':201 '/request':19,38 '0.02':18,37,69,138 '000':132 '20':131 '402':126,237 '402 payment api' '6':142 'access':122 'advertis':146 'ai':12,31,158 'ai-inference' 'ai/ml':57 'analysi':162 'analyt':56,152 'api':5,24,45,87,121,150 'appear':185 'attach':98 'avail':228 'base':8,27,77,133 'base network api' 'bodi':250 'broad':50 'call':4,23 'caller':96 'captur':239 'categori':148 'challeng':127,238 'classif':165 'classification' 'commit':95 'confirm':235 'connect':207 'convers':181 'conversion' 'cover':10,29 'crawl':231 'crypto-quotes' 'data':11,30,55,60,151,155 'data-analytics' 'decim':143 'detail':214 'difficult':245 'document':192,223,242 'embed':166 'embeddings' 'enabl':44 'endpoint':16,35,53,65,114,184,233,262 'estim':176 'everi':64 'exampl':227 'exchang':171 'expect':257 'export':156 'extrem':194 'feed':170 'financ':13,32,167 'finance-data' 'finance/web3':59 'four':147 'gas':175 'generat':182 'geocod':179 'geocoding' 'header':103 'i.e':137 'infer':58 'infrastructur':62,178 'insight':157 'key':88 'know':247 'learn':160 'limit':91 'list':118 'live':236 'low payment fee' 'lowpaymentfee.com':39 'machin':159 'metric':153 'micropayment api' 'minimum':94 'model':191 'network':78 'offer':48 'openapi':218 'page':202 'particular':260 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':82,102,107 'per':3,22,70 'platform':6,25,46,145 'premium':120 'price':67,169,190 'prompt':209 'proof':108 'protocol':83 'quot':174 'rate':90,172 'render':204 'report':154 'request':71,111,128,249 'request/response':221 'respons':255 'return':124 'schema':222 'send':252 'sentiment':161 'sentiment-analysis' 'settl':72 'simpli':97 'sinc':139 'span':54 'spars':195 'spec':219 'specif':113 'suit':51 'summar':164 'technic':213 'text':163 'text-summarization' 'token':173 'transfer':261 'unit':134 'usag':226 'usdc':9,28,74,136,140 'usdc api' 'usdc-base' 'use':141,187 'util':15,34,63 'valid':106,180 'validation' 'via':79 'wallet':208 'web3':168 'without':241 'x':101 'x-payment':100 'x402':43,81 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8875debd-2d04-499a-8bff-68f6809a2605","listingId":"ce346079-08e4-4ee1-a016-ea75dfdcd477","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:55.491Z"}],"sources":[{"listingId":"ce346079-08e4-4ee1-a016-ea75dfdcd477","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:55.491Z","lastSeenAt":"2026-04-22T08:31:51.090Z"}],"details":{"listingId":"ce346079-08e4-4ee1-a016-ea75dfdcd477","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/67 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/67"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC micropayments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key signup","Accessing utility services like geocoding, validation, and data conversion on a pay-as-you-go basis","Exporting analytics data and generating insights reports via programmatic API calls"],"bestFor":["Developers wanting instant API access without registration or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.671Z"},"updatedAt":"2026-04-22T08:31:51.090Z"}}