{"id":"aefbcc33-f009-4142-a538-d7c4a581f856","shortId":"jtM2FQ","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 hosts 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/inbox/90` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USD given 6 decimals). It accepts HTTP POST requests and returns application/json. Payment is made via the x402 exact scheme to the specified wallet address on Base. No API keys or rate limits are advertised — access is gated purely by per-call micropayment.\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. The purpose of the `/api/v1/inbox/90` endpoint specifically is unclear — it does not match any of the named endpoints on the landing page, so its actual functionality is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","data-analytics","ai-inference","finance-data","utility-services","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["micropayment API","x402 API","pay-per-call","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The /api/v1/inbox/90 endpoint does not match any of the named endpoints listed on the landing page — its actual functionality is unknown.","No OpenAPI specification, request schema, or response schema is available.","The /api, /pricing, and /README pages all resolve to a wallet-connect prompt with no documentation content.","Without documented input/output schemas, callers cannot know what to send or what to expect back."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/90","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/90","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 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 /api/v1/inbox/90 path does not correspond to any named endpoint on the site. Functionality is essentially 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'/api/v1/inbox/90':117,227 '/pricing':194 '/readme':196 '/request':19,38 '0.02':18,37,99,135 '000':130 '20':129 '6':138 'Base network API' 'USDC API' 'accept':141 'access':123,171 'across':58 'actual':247 'address':160 'advertis':170 'ai':12,31,68 'ai-inference' 'amount':127 'analysi':72 'analyt':62 'api':5,24,45,122,164 'application/json':147 'avail':187 'base':8,27,107,131,162 'broad':50 'call':4,23,178 'catalog':51 'categori':60 'classif':75 'connect':204 'content':209 'convers':92 'data':11,30,61,65 'data-analytics' 'decim':139 'document':180,218 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,188,228,240 'estim':86 'exact':154 'exampl':222 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':248 'gas':85 'gate':173 'generat':93 'geocod':90 'given':137 'host':48 'http':142 'http-post' 'infrastructur':88 'insight':67 'json-response' 'key':165 'land':184,243 'learn':70 'limit':168 'list':119,186 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':150 'match':235 'max':126 'metric':63 'micropay':179 'micropayment API' 'minim':182 'name':239 'network':108 'no-api-key' 'offer':10,29 'openapi':213 'page':185,197,244 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request':53 'payment':148 'per':3,22,55,100,177 'per-cal':176 'platform':6,25,46 'post':143 'premium':121 'price':79,97,190 'prompt':205 'protocol':112 'pure':174 'purpos':224 'quot':84 'rate':82,167 'report':64 'request':56,101,144 'request/response':216 'resolv':199 'return':146 'schema':217 'scheme':155 'sentiment':71 'settl':102 'spec':214 'specif':114,229 'specifi':158 'summar':74 'text':73 'token':83 'unclear':231 'unit':132 'unknown':250 'usag':221 'usd':136 'usdc':9,28,104,134 'usdc-base' 'util':15,34,89 'utility-services' 'valid':91 'via':109,151 'wallet':159,203 'wallet-connect':202 'web3':78 'x402':43,111,153 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4d896bae-d37d-42fb-9d9c-19c6be6c9fbb","listingId":"aefbcc33-f009-4142-a538-d7c4a581f856","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/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.114Z"}],"sources":[{"listingId":"aefbcc33-f009-4142-a538-d7c4a581f856","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.114Z","lastSeenAt":"2026-04-22T10:02:57.539Z"}],"details":{"listingId":"aefbcc33-f009-4142-a538-d7c4a581f856","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/90 \\\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":"All endpoints are 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":"The x402 challenge for /api/v1/inbox/90 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/90"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data (prices, exchange rates, gas estimates) with per-call payment","Running utility operations (geocoding, validation, conversion) on a pay-as-you-go basis"],"bestFor":["Agents or applications that need keyless, pay-per-use API access","Developers wanting to avoid subscription commitments for occasional API calls","Web3-native workflows that can settle USDC micropayments on Base"],"notFor":["High-volume use cases where $0.02/request adds up significantly compared to subscription plans","Users who need detailed API documentation, SDKs, or guaranteed SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.885Z"},"updatedAt":"2026-04-22T10:02:57.539Z"}}