{"id":"4ba25249-785c-4380-9b9e-17118bd655cb","shortId":"cxZK3W","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request 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 at `/api/v1/charges/87` is listed as \"Premium API Access\" and returns a standard x402 challenge requesting up to 20,000 base units of USDC (0x8335...0913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality behind the \"Premium API Access\" label at `/api/v1/charges/87` is unclear — it does not map to any of the named endpoints listed on the homepage. Without documentation or example payloads, it is difficult to determine what this specific endpoint returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","serverless API","on-demand API"],"warnings":["The endpoint path /api/v1/charges/87 does not correspond to any named endpoint on the homepage — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The breadth of claimed capabilities (16+ endpoints across 4 categories) cannot be verified from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/87","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/charges/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation beyond a landing page listing, and no request/response examples. The specific endpoint '/api/v1/charges/87' is not described anywhere on the site. Pricing is clear but functionality is 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'/api/v1/charges/87':113,224 '/docs':180 '/pricing':181 '/readme':184 '/request':12,31 '0.02':11,30,99,141 '000':130 '0913':136 '0x8335':135 '20':129 '6':145 'Base network API' 'USDC API' 'access':119,221 'across':58 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,157,220 'attach':165 'avail':210 'base':8,27,107,131,138 'behind':217 'broad':50 'call':4,23 'caller':163 'catalog':51 'categori':60 'challeng':125 'classif':75 'classification' 'connect':190 'content':196 'convers':92 'crawl':213 'data':14,33,61,65 'data-analytics' 'decim':146 'determin':250 'difficult':248 'document':175,205,242 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,95,111,236,254 'equal':140 'estim':86 'exact':153,215 'exampl':209,244 'exchang':81 'export':66 'extrem':177 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':216 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':142 'header':170 'homepag':240 'infrastructur':88 'insight':67 'key':158 'label':222 'learn':70 'limit':161 'list':115,237 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':149 'map':230 'metric':63 'micropayment API' 'name':235 'network':108 'no-api-key' 'offer':48 'on-demand API' 'openapi':200 'page':185 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payload':245 'payment':147,169 'per':3,22,55,100 'platform':6,25,46 'post':173 'premium':117,219 'price':79,97 'prompt':192 'quot':84 'rate':82,160 'render':187 'report':64 'request':56,101,126,174 'request/response':203 'requir':162 'return':121,255 'schema':204 'scheme':154 'sentiment':71 'sentiment-analysis' 'serverless API' 'simpli':164 'spars':178 'spec':201 'specif':110,253 'standard':123 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':226 'unit':132 'usag':208 'usdc':104,134,143 'usdc-base' 'util':18,37,89 'valid':91 'via':9,28,150 'wallet':191 'web3':78 'without':241 'x':168 'x-payment':167 'x402':10,29,43,124,152 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2de32dfb-1a07-4d7d-b830-42d48e2f5813","listingId":"4ba25249-785c-4380-9b9e-17118bd655cb","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/charges/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:33.233Z"}],"sources":[{"listingId":"4ba25249-785c-4380-9b9e-17118bd655cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:33.233Z","lastSeenAt":"2026-04-23T06:31:02.899Z"}],"details":{"listingId":"4ba25249-785c-4380-9b9e-17118bd655cb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/87 \\\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 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 x402 challenge requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/charges/87"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion with no signup"],"bestFor":["Agents or developers who want instant API access without API keys or accounts","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications that can pay in USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.216Z"},"updatedAt":"2026-04-23T06:31:02.899Z"}}