{"id":"e95ef1a9-f737-4b64-8880-80154ac0a3e2","shortId":"QQc9WT","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers 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 and settle in USDC on the Base network.\n\nThe specific endpoint being listed here — `/api/v1/orders/67` — is described as \"Premium API Access\" in its x402 challenge. Its maxAmountRequired is 20000 base units of USDC (0x8335…), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised; access is gated entirely by the x402 payment protocol.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/orders/67` endpoint actually returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them. The purpose of the `/orders/67` path specifically (as opposed to the other listed endpoints) is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no content","The purpose and expected input/output of /api/v1/orders/67 specifically is undocumented","The broad catalog of 16+ endpoints is listed but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/67","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/orders/67","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). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/orders/67 is unexplained. The docs, pricing, and README pages are all empty 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'/api/v1/orders/67':115,205 '/call':12,31 '/docs':173 '/orders/67':235 '/pricing':174 '/readme':177 '0.02':11,30,98,137 '0x8335':134 '20000':129 '6':141 'accept':145 'access':121,159 'across':58 'actual':207 'advertis':158 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,120,152 'application/json':150 'base':8,27,107,130 'base usdc api' 'base-network' 'broad':50 'catalog':51 'categori':60 'challeng':125 'classif':75 'classification' 'connect':183 'content':189 'convers':91 'data':14,33,61,65 'data-analytics' 'decim':142 'describ':117 'detail':220 'document':168,198 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,94,111,144,206,216,244 'entir':162 'equal':136 'estim':86 'exampl':201 'exchang':81 'export':66 'extrem':170 'feed':80 'financ':16,35,77 'finance-data' 'format':226 'four':59 'gas':85 'gate':161 'generat':92 'geocod':89 'geocoding' 'given':138 'infrastructure/utilities':88 'insight':67 'json-api' 'key':153 'land':212 'learn':70 'limit':156 'list':113,214,243 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'mani':215 'maxamountrequir':127 'metric':63 'micropayment api' 'network':108 'offer':48 'openapi':193 'oppos':239 'page':178,213 'paramet':223 'path':236 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':166 'per':3,22,55,99 'platform':6,25,46 'post':146 'premium':119 'price':79,96 'prompt':185 'protocol':167 'provid':218 'purpos':232 'quot':84 'rate':82,155 'report':64 'request':4,23,56,100,147,222 'request/response':196 'respons':225 'return':149,180,208 'schema':197 'sentiment':71 'sentiment-analysis' 'settl':102 'site':210 'spars':171 'spec':194 'specif':110,237 'substant':188 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':246 'unit':131 'usdc':104,133,139 'usdc-settlement' 'util':18,37 'valid':90 'via':9,28 'wallet':184 'web3':78 'x402':10,29,43,124,165 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b0eef8ce-8339-4e5c-9f7c-94239b8ade1f","listingId":"e95ef1a9-f737-4b64-8880-80154ac0a3e2","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/orders/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:44.127Z"}],"sources":[{"listingId":"e95ef1a9-f737-4b64-8880-80154ac0a3e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:44.127Z","lastSeenAt":"2026-04-23T12:30:48.665Z"}],"details":{"listingId":"e95ef1a9-f737-4b64-8880-80154ac0a3e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/67 \\\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 API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/67"},{"claim":"Endpoint described as 'Premium API Access' accepting POST with application/json mime type","source_url":"https://lowpaymentfee.com/api/v1/orders/67"},{"claim":"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 like token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or apps that need simple pay-per-call access without subscriptions or API keys","Developers experimenting with x402 protocol integrations on Base","Low-volume or bursty workloads where flat per-request pricing is preferable to monthly plans"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.886Z"},"updatedAt":"2026-04-23T12:30:48.665Z"}}