{"id":"d96b9915-87d9-4402-bf94-242714c184d7","shortId":"K8Nvkp","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 catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/123` 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 a payment header and receive the response immediately.\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 no minimum commitments.\n\nImportant caveats: the `/api/v1/inbox/123` path does not clearly map to any of the documented endpoint categories, and no request/response schema documentation was found for any endpoint. The /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without OpenAPI specs, example payloads, or detailed documentation, it is difficult to know what data this specific endpoint accepts or returns.","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":["data","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /api/v1/inbox/123 path does not correspond to any documented endpoint category on the landing page","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No example request or response payloads are available — callers must guess at the expected input format","Platform legitimacy and reliability are unverifiable from available information"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/123","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/inbox/123","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 captured) 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 /inbox/123 path is unexplained. The /api, /pricing, and /README pages are empty behind a wallet gate. This is effectively a stub 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'/api/v1/inbox/123':69,179 '/pricing':204 '/readme':206 '/request':19,38,164 '0.02':18,37,80,163 '000':84 '20':83 '6':90 'accept':237 'access':75 'account':102 'advertis':120 'ai':12,31,131 'ai-inference' 'analysi':135 'analyt':125 'api':5,24,45,74,100 'attach':108 'base':8,27,63,85 'base network api' 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':123,191 'caveat':177 'claim':168 'classif':138 'classification' 'clear':183 'commit':175 'connect':212 'content':218 'convers':155 'cost':77 'cover':10,29 'data':11,30,124,128,233 'data-analytics' 'decim':91 'detail':225 'difficult':229 'document':189,196,226 'embed':139 'embeddings' 'enabl':44 'endpoint':16,35,57,67,122,159,190,201,236 'estim':149 'exampl':222 'exchang':144 'export':129 'feed':143 'financ':13,32,140 'finance-data' 'found':198 'four':121 'gas':148 'generat':156 'geocod':153 'geocoding' 'handl':94 'header':111 'immedi':116 'import':176 'infrastructur':151 'insight':130 'key':101 'know':231 'learn':133 'limit':171 'list':71,158 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':132 'map':184 'metric':126 'micropayment api' 'minimum':174 'network':64 'offer':48 'openapi':220 'page':207 'path':180 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payload':223 'payment':92,110 'per':3,22,55,81 'platform':6,25,46,119,167 'premium':73 'price':142,165 'prompt':214 'protocol':98 'quot':147 'rate':145,170 'receiv':113 'report':127 'request':56 'request/response':194 'requir':106 'respons':115 'return':209,239 'schema':195 'sentiment':134 'sentiment-analysis' 'settl':58 'share':160 'spec':221 'specif':66,235 'subscript':104 'substant':217 'summar':137 'text':136 'text-summarization' 'token':146 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-base' 'util':15,34,152 'utility-apis' 'valid':154 'via':95 'wallet':213 'web3':141 'wider':118 'without':219 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1556b3b9-8812-487e-bb3d-52ecf2a95da9","listingId":"d96b9915-87d9-4402-bf94-242714c184d7","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/inbox/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.499Z"}],"sources":[{"listingId":"d96b9915-87d9-4402-bf94-242714c184d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.499Z","lastSeenAt":"2026-04-22T10:32:50.220Z"}],"details":{"listingId":"d96b9915-87d9-4402-bf94-242714c184d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/123 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/123"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints 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/inbox/123"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data (prices, exchange rates, gas estimates) with per-call USDC payment","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis","Exporting data or retrieving analytics metrics without subscription commitments"],"bestFor":["Agents or developers who want instant, keyless API access paid in USDC on Base","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.872Z"},"updatedAt":"2026-04-22T10:32:50.220Z"}}