{"id":"2d50a1c3-52cb-4a92-ba64-6238d67e6c2d","shortId":"35FYWK","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API platform that provides a collection 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, payable in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/charges/385` is listed as \"Premium API Access\" and returns a live 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. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the endpoints actually return. The specific functionality behind the `/api/v1/charges/385` \"Premium API Access\" endpoint is unclear and may be a generic or catch-all route rather than a distinct service.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","no-api-key"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","cheap api","micro-transaction api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/charges/385 ('Premium API Access') is undefined — it is unclear what data or service it provides","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/385","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/385","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no clarity on what 'Premium API Access' at /api/v1/charges/385 actually returns. The listing is largely a 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'/api/v1/charges/385':107,213 '/docs':172 '/pricing':174 '/readme':176 '/request':17,34 '0.02':16,33,93,135 '000':124 '0913':130 '0x8335':129 '20':123 '6':139 'access':113,161,216 'across':52 'actual':206 'addit':187 'advertis':159 'ai':10,27,62 'analysi':66 'analyt':56 'api':4,21,40,112,151,215 'base':7,24,101,125,132 'base network api' 'behind':211 'catch':227 'catch-al':226 'categori':54 'challeng':119 'cheap api' 'classif':69 'collect':45 'commit':166 'connect':182 'content':189 'convers':86 'data':9,26,55,59 'data-analytics' 'decim':140 'distinct':233 'document':167,198 'embed':70 'embeddings' 'endpoint':14,31,51,89,105,205,217 'equal':134 'estim':80 'exact':147 'exampl':201 'exchang':75 'exchange-rates' 'export':60 'extrem':169 'feed':74 'financ':11,28,71 'four':53 'function':210 'gas':79 'gas-estimates' 'gate':3,20 'generat':87 'generic':224 'geocod':84 'geocoding' 'given':136 'infrastructur':82 'insight':61 'instant':160 'key':152 'learn':64 'limit':155 'list':109 'live':117 'low payment fee' 'lowpaymentfee.com':35 'machin':63 'made':143 'may':221 'metric':57 'micro-transaction api' 'micropayment api' 'minimum':164 'network':102 'no-api-key' 'offer':8,25 'openapi':193 'page':177 'pay':48 'pay per call api' 'pay-per-request':47 'payabl':96 'payment':141 'per':49,94 'platform':5,22,41,158 'premium':111,214 'price':73,91 'price-feeds' 'prompt':184 'protocol':39 'provid':43 'quot':78 'rate':76,154 'rather':230 'render':179 'report':58 'request':50,95,120 'request/response':196 'requir':156 'return':115,207 'rout':229 'schema':197 'scheme':148 'sentiment':65 'sentiment-analysis' 'servic':234 'spars':170 'spec':194 'specif':104,209 'summar':68 'technic':188 'text':67 'text-classification' 'text-summarization' 'token':77 'unclear':219 'unit':126 'usdc':98,128,137 'usdc api' 'usdc-base' 'util':13,30,83 'valid':85 'via':144 'wallet':183 'web3':72 'x402':2,19,38,118,146 'x402 api' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f3ab26b5-8021-405c-9ca9-a5c1d4de4bf1","listingId":"2d50a1c3-52cb-4a92-ba64-6238d67e6c2d","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/385","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:23.562Z"}],"sources":[{"listingId":"2d50a1c3-52cb-4a92-ba64-6238d67e6c2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/385","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:23.562Z","lastSeenAt":"2026-04-23T08:01:18.923Z"}],"details":{"listingId":"2d50a1c3-52cb-4a92-ba64-6238d67e6c2d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/385 \\\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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/385"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without subscription commitments","Fetching real-time crypto gas estimates or token price quotes via micropayment","Geocoding or data validation as a lightweight utility call from an autonomous agent","Exporting analytics data or generating reports on a per-request billing basis"],"bestFor":["AI agents that need low-cost, no-auth API access on Base","Developers prototyping with pay-per-use endpoints without signup","Web3-native applications that prefer on-chain micropayments over API keys"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integrating","Applications requiring non-USDC or non-Base payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.697Z"},"updatedAt":"2026-04-23T08:01:18.923Z"}}