{"id":"4dc99539-629d-4839-b923-6d72d057bd4c","shortId":"SNAvwZ","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 suite of 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 at `/api/v1/charges/346` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 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 request.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the `/api/v1/charges/346` endpoint specifically returns. The landing page confirms the general platform offering and pricing model, but the exact behavior of this particular charge endpoint is unclear.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","pay-per-use","post-endpoint"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All docs/pricing/README pages return only 'Connect wallet' with no usable content","The specific behavior and response format of /api/v1/charges/346 is undocumented","No request body schema or response examples are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/346","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/346","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 schema, no request/response examples, and no documentation beyond a landing page listing. The specific purpose of /api/v1/charges/346 ('Premium API Access') is undefined — it's unclear what data or service it 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'/request':12,31 '0.02':11,30,94,139 '000':128 '0x8335':133 '20':127 '2913':134 '402 payment API' '6':143 'Base network API' 'USDC API' 'accept':117 'access':115 'across':53 'advertis':123 'ai':15,34,63 'analysi':67 'analyt':57 'api':5,24,45,114,155,179 'attach':163 'base':8,27,103,129,136 'base-network' 'behavior':228 'call':4,23 'caller':161 'categori':55 'challeng':122 'charg':232 'classif':70 'confirm':217 'connect':188 'content':194 'convers':87 'crawl':177 'crypto-paid API' 'data':14,33,56,60 'decim':144 'descript':206 'detail':205 'doc':178 'document':172 'embed':71 'enabl':44 'endpoint':19,38,52,90,107,211,233 'equal':138 'estim':81 'exact':151,227 'exampl':202 'exchang':76 'export':61 'extrem':174 'feed':75 'financ':16,35,72 'four':54 'gas':80 'general':219 'generat':88 'geocod':85 'given':140 'header':168 'infrastructur':83 'insight':62 'key':156 'land':215 'learn':65 'limit':159 'list':111 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':147 'maxamountrequir':125 'metric':58 'micropayment API' 'model':224 'network':104 'no-api-key' 'offer':48,221 'openapi':198 'page':183,216 'particular':231 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-use' 'payment':145,167 'per':3,22,95 'per-request-billing' 'platform':6,25,46,220 'post':118 'post-endpoint' 'premium':113 'price':74,92,180,223 'prompt':190 'quot':79 'rate':77,158 'readm':182 'report':59 'request':96,119,171 'request/response':201 'requir':160 'return':185,213 'schema':199 'scheme':152 'sentiment':66 'settl':98 'simpli':162 'spars':175 'specif':106,212 'suit':50 'summar':69 'text':68 'token':78 'unclear':235 'unit':130 'usdc':100,132,141 'usdc-settlement' 'util':18,37,84 'valid':86 'via':9,28,148 'wallet':189 'web3':73 'x':166 'x-payment':165 'x402':10,29,43,121,150 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"19fab0f4-481d-4ec6-9924-64b582f4f785","listingId":"4dc99539-629d-4839-b923-6d72d057bd4c","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/346","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:15.748Z"}],"sources":[{"listingId":"4dc99539-629d-4839-b923-6d72d057bd4c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/346","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:15.748Z","lastSeenAt":"2026-04-23T08:01:18.596Z"}],"details":{"listingId":"4dc99539-629d-4839-b923-6d72d057bd4c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/346 \\\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 minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settles in USDC on the Base network with no API keys or rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/346"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to data analytics, AI inference, or financial data with per-call USDC payments","Web3-native applications that want to consume utility APIs settled on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with crypto wallets that can settle x402 payments automatically","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or SLA guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.032Z"},"updatedAt":"2026-04-23T08:01:18.596Z"}}