{"id":"5d7ec263-e614-4f78-b667-bc18ef880184","shortId":"7RvwAM","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/keys/97` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider platform advertises four endpoint 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/request pricing. The platform claims no rate limits and instant access.\n\nImportant caveat: the specific endpoint probed (`/api/v1/keys/97`) does not clearly map to any of the named API categories on the landing page. Its purpose — \"Premium API Access\" — is vague and undocumented. There is no OpenAPI schema, no request/response examples, and the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation. Prospective callers should treat this as a minimally documented endpoint until the provider publishes schemas or usage guides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or JSON schema available for this endpoint","The endpoint path /api/v1/keys/97 does not match any of the named APIs on the landing page — its actual functionality is unclear","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no technical content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/97","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the endpoint name 'Premium API Access' is vague. Documentation pages (/api, /pricing, /README) returned no useful content. The actual functionality behind /api/v1/keys/97 is 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'/api/v1/keys/97':69,186 '/pricing':222 '/readme':224 '/request':19,38,169 '0.02':18,37,80,168 '000':84 '20':83 '402 payment api' '6':90 'access':75,179,206 'account':102 'addit':235 'advertis':125 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':130 'api':5,24,45,74,100,196,205 'attach':108 'base':8,27,63,85 'base network api' 'broad':50 'call':4,23,82 'caller':107,238 'catalog':51 'categori':128,197 'caveat':181 'claim':173 'classif':143 'classification' 'clear':189 'connect':230 'convers':160 'cost':77 'data':11,30,129,133 'data-analytics' 'decim':91 'document':236,245 'embed':144 'embeddings' 'enabl':44 'endpoint':16,35,57,67,127,164,184,246 'estim':154 'exampl':218 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'finance-data' 'four':126 'gas':153 'generat':161 'geocod':158 'geocoding' 'guid':254 'handl':94 'header':113 'import':180 'infrastructur':156 'insight':135 'instant':178 'key':101 'land':200 'learn':138 'limit':176 'list':71,163 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'map':190 'metric':131 'micropayment api' 'minim':244 'name':195 'network':64 'offer':10,29 'openapi':214 'page':201,225 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,124,172 'premium':73,204 'price':147,170 'probe':185 'prompt':232 'prospect':237 'protocol':98 'provid':48,249 'publish':250 'purpos':203 'quot':152 'rate':150,175 'report':132 'request':56,121 'request/response':217 'requir':106 'return':227 'schema':215,251 'sentiment':139 'sentiment-analysis' 'settl':58 'share':165 'sign':116 'specif':66,183 'subscript':104 'summar':142 'text':141 'text-summarization' 'token':151 'treat':240 'undocu':210 'unit':86 'usag':253 'usdc':9,28,60,88,117 'usdc api' 'usdc-base' 'util':15,34,157 'utility-apis' 'vagu':208 'valid':159 'via':95 'wallet':231 'web3':146 'wider':123 'x':111 'x-payment':110 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"c610cfb4-5030-4754-9830-1b3114a3c874","listingId":"5d7ec263-e614-4f78-b667-bc18ef880184","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.112Z"}],"sources":[{"listingId":"5d7ec263-e614-4f78-b667-bc18ef880184","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.112Z","lastSeenAt":"2026-04-22T01:02:19.609Z"}],"details":{"listingId":"5d7ec263-e614-4f78-b667-bc18ef880184","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/97 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/97"},{"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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, exchange rates, or gas estimates via micropayment","Running geocoding or data validation calls from autonomous workflows that settle in USDC on Base"],"bestFor":["AI agents needing keyless, pay-per-call access to multiple utility endpoints","Developers who want to avoid subscription commitments and pay only per request","Web3-native applications that can sign USDC payments on Base"],"notFor":["High-volume batch workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.751Z"},"updatedAt":"2026-04-22T01:02:19.609Z"}}