{"id":"1c9f29ac-72f3-4941-b3e8-0ffa960e374c","shortId":"VrArav","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 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/keys/64` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is made by including an X-PAYMENT header; no API keys, subscriptions, or rate limits are advertised. The platform accepts POST requests and returns application/json responses.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but the /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind the `/api/v1/keys/64` \"Premium API Access\" endpoint is unclear from the available information.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","micro-transaction api"],"warnings":["No OpenAPI or schema documentation available","The exact functionality of /api/v1/keys/64 'Premium API Access' is not documented anywhere in the crawled material","All documentation pages (/api, /pricing, /README) resolve to a wallet-connect prompt with no content","No request or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/64","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/keys/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/keys/64 ('Premium API Access') is unexplained. Effectively a stub 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'/api/v1/keys/64':117,223 '/pricing':184 '/readme':186 '/request':19,38 '0.02':18,37,99,136,139 '000':131 '20':130 'accept':163 'access':123,226 'across':58 'advertis':160 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,122,153,225 'application/json':168 'avail':177,213,232 'base':8,27,107,132 'base network api' 'behind':221 'broad':50 'call':4,23,141 'carri':125 'catalog':51 'categori':60 'charg':128 'cheap api' 'classif':75 'connect':194 'content':199 'convers':92 'conversion' 'crawl':216 'crypto-quotes' 'data':11,30,61,65 'data-analytics' 'document':170,208 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,178,227 'estim':86 'exact':219 'exampl':212 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':220 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'header':151 'i.e':138 'includ':146 'inform':233 'infrastructur':88 'insight':67 'key':154 'land':174 'learn':70 'limit':158 'list':119,176 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':144 'materi':217 'maximum':127 'metric':63 'micro-transaction api' 'micropayment api' 'minim':172 'network':108 'offer':10,29 'openapi':203 'page':175,187 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':142,150 'per':3,22,55,100,140 'platform':6,25,46,162 'post':164 'premium':121,224 'price':79,97,180 'prompt':195 'protocol':112 'provid':48 'quot':84 'rate':82,157 'report':64 'request':56,101,165 'request/response':206 'resolv':189 'respons':169 'return':167 'schema':207 'sentiment':71 'sentiment-analysis' 'settl':102 'spec':204 'specif':114 'subscript':155 'summar':74 'text':73 'text-classification' 'text-summarization' 'token':83 'unclear':229 'unit':133 'usag':211 'usdc':9,28,104,135,137 'usdc api' 'usdc-base-network' 'util':15,34,89 'valid':91 'validation' 'via':109 'wallet':193 'wallet-connect':192 'web3':78 'x':149 'x-payment':148 'x402':43,111 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3864279d-8732-4d22-bc0d-0b12e3ce063b","listingId":"1c9f29ac-72f3-4941-b3e8-0ffa960e374c","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/keys/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.659Z"}],"sources":[{"listingId":"1c9f29ac-72f3-4941-b3e8-0ffa960e374c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.659Z","lastSeenAt":"2026-04-22T01:02:19.027Z"}],"details":{"listingId":"1c9f29ac-72f3-4941-b3e8-0ffa960e374c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/64 \\\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 priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint /api/v1/keys/64 returns 402 with maxAmountRequired of 20000 base units (0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/keys/64"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys or rate limits advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval with per-call USDC micropayments","On-demand AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto prices, gas estimates, and exchange rates via pay-as-you-go calls","Geocoding, data validation, and format conversion as utility microservices","Accessing premium API keys or resources gated behind x402 payment"],"bestFor":["Developers and agents wanting zero-commitment, pay-per-use API access","Crypto-native applications that can settle payments in USDC on Base","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing becomes expensive","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.396Z"},"updatedAt":"2026-04-22T01:02:19.027Z"}}