{"id":"5de364c1-8378-400c-a6f2-e8c1e814f139","shortId":"H8mScQ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/400` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers simply attach an x402 payment header to each request.\n\nThe platform organizes its APIs into 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 listed endpoints share the same $0.02 per-request pricing.\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 crawled content. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual behavior and response format of `/api/v1/payments/400` specifically is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"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 purpose and expected input/output of /api/v1/payments/400 ('Premium API Access') is not documented — it may be a generic or demo endpoint","No information on what data sources back the analytics, AI, or finance endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/400","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/payments/400","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 confirms pricing and network details, but documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available. The purpose of the specific /api/v1/payments/400 endpoint is unclear beyond its 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'/request':19,38 '0.02':18,37,79,156 '000':83 '20':82 '402 payment api' '6':89 'accept':211 'access':74 'actual':216 'advertis':98 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,45,73,92,113,167 'attach':101 'avail':197,227 'base':8,27,63,84 'base network api' 'base-network' 'behavior':217 'broad':50 'call':4,23,81 'caller':99 'catalog':51 'categori':116 'challeng':204 'charg':76 'classif':131 'classification' 'confirm':205 'connect':176 'content':201 'convers':148 'crawl':200 'data':11,30,117,121 'data-analytics' 'decim':90 'detail':183 'doc':166 'document':161,192 'embed':132 'embeddings' 'enabl':44 'endpoint':16,35,57,67,152,207 'estim':142 'exampl':196 'exchang':137 'export':122 'extrem':163 'feed':136 'financ':13,32,133 'finance-data' 'format':220 'four':115 'gas':141 'generat':149 'geocod':146 'geocoding' 'header':105 'infrastructur':144 'insight':123 'key':93 'label':71 'learn':126 'limit':96 'list':151 'live':209 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'materi':228 'metric':119 'micropayment api' 'network':64 'no-api-key' 'offer':10,29 'openapi':187 'organ':111 'page':171 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':104 'per':3,22,55,80,158 'per-request':157 'platform':6,25,46,110 'post':212 'premium':72 'price':135,160,168 'prompt':178 'provid':48 'quot':140 'rate':95,138 'readm':170 'render':173 'report':120 'request':56,108,159,213 'request/response':190 'respons':219 'schema':191 'sentiment':127 'sentiment-analysis' 'settl':58 'share':153 'simpli':100 'spars':164 'spec':188 'specif':66,223 'summar':130 'technic':182 'text':129 'text-summarization' 'token':139 'unclear':225 'unit':85 'usag':195 'usdc':9,28,60,87 'usdc api' 'usdc-settlement' 'util':15,34,145 'valid':147 'wallet':177 'web3':134 'x402':43,103,203 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"cf28cc83-d0e5-4a71-a7b1-cb2047821a70","listingId":"5de364c1-8378-400c-a6f2-e8c1e814f139","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/payments/400","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:38.668Z"}],"sources":[{"listingId":"5de364c1-8378-400c-a6f2-e8c1e814f139","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/400","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:38.668Z","lastSeenAt":"2026-04-22T15:01:39.261Z"}],"details":{"listingId":"5de364c1-8378-400c-a6f2-e8c1e814f139","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/400 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/400"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/400"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Projects already operating on the Base network with USDC","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing at $0.02 may add up quickly","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.492Z"},"updatedAt":"2026-04-22T15:01:39.261Z"}}