{"id":"308da86f-4711-483f-8d27-4ad591f6a79a","shortId":"sFbsgG","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, paid in USDC on the Base network.\n\nThe specific endpoint being listed here — `/api/v1/orders/98` — is described as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (i.e., $0.02). It accepts POST requests and returns application/json. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment proof, and the server settles on-chain to the specified payTo address.\n\nThe platform advertises no API keys, no rate limits, and instant access. Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive technical documentation. There is no OpenAPI spec, no request/response schema beyond the x402 challenge metadata, and no example payloads. The actual functionality behind the `/api/v1/orders/98` endpoint is unclear — the name \"Premium API Access\" is generic and could be a meta-endpoint or an order-specific resource.","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":["pay per call API","x402 API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto API payments","serverless API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The endpoint path '/api/v1/orders/98' with description 'Premium API Access' is ambiguous; unclear what data or service it provides","No examples or sample responses available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no request/response schemas, and all documentation pages render only 'Connect wallet' with no content. The specific endpoint '/api/v1/orders/98' has a generic description ('Premium API Access') with no clarity on what it actually returns. Effectively a stub 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'/api/v1/orders/98':115,229 '/call':12,31 '/docs':190 '/pricing':191 '0.02':11,30,99,135 '000':129 '20':128 'Base network API' 'USDC API' 'accept':137 'access':121,185,237 'across':58 'actual':225 'address':173 'advertis':176 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,120,178,236 'application/json':142 'base':8,27,107,130 'behind':227 'beyond':215 'broad':50 'caller':150 'carri':123 'catalog':51 'categori':60 'chain':168 'challeng':218 'charg':126 'classif':75 'classification' 'connect':199 'convers':92 'could':241 'crypto API payments' 'current':195 'data':14,33,61,65 'data-analytics' 'describ':117 'document':186,206 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,230,246 'estim':86 'exampl':222 'exchang':81 'exist':188 'export':66 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':226 'gas':85 'generat':93 'generic':239 'geocod':90 'geocoding' 'handl':145 'header':156 'i.e':134 'includ':151 'infrastructur':88 'insight':67 'instant':184 'key':179 'learn':70 'limit':182 'list':113 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maximum':125 'meta':245 'meta-endpoint':244 'metadata':219 'metric':63 'micropayment API' 'name':234 'network':108 'offer':48 'on-chain':166 'openapi':210 'order':250 'order-specif':249 'page':187 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payload':223 'payment':143,155,160 'payto':172 'per':3,22,55,100 'platform':6,25,46,175 'post':138 'premium':119,235 'price':79,97 'prompt':201 'proof':161 'protocol':149 'quot':84 'rate':82,181 'render':196 'report':64 'request':4,23,56,101,139 'request/response':213 'resourc':252 'return':141 'schema':214 'sentiment':71 'sentiment-analysis' 'server':164 'serverless API' 'settl':165 'sign':159 'spec':211 'specif':110,251 'specifi':171 'substant':204 'summar':74 'technic':205 'text':73 'text-summarization' 'token':83 'unclear':232 'unit':131 'usdc':104,133 'usdc-base' 'util':18,37,89 'utility-apis' 'valid':91 'via':9,28,146 'wallet':200 'web3':78 'x':154 'x-payment':153 'x402':10,29,43,148,217 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"27a08ed4-8c42-4325-b465-7925a17fcdf9","listingId":"308da86f-4711-483f-8d27-4ad591f6a79a","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:02.455Z"}],"sources":[{"listingId":"308da86f-4711-483f-8d27-4ad591f6a79a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:02.455Z","lastSeenAt":"2026-04-23T20:01:24.770Z"}],"details":{"listingId":"308da86f-4711-483f-8d27-4ad591f6a79a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/98 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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, paid in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","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/98"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding or data validation with instant crypto-settled micropayments","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call 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 adds up quickly","Users who need detailed API documentation, request schemas, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:18:52.939Z"},"updatedAt":"2026-04-23T20:01:24.770Z"}}