{"id":"84e77cef-ccad-4387-b0be-857c3309e8f8","shortId":"5uxPsv","kind":"x402","title":"Pay-per-call API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety 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 payments in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/stripe/charges/18` is labeled \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts HTTP POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The name \"stripe/charges\" suggests it may relate to Stripe payment or charge data, but this is unconfirmed. Prospective users should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","stripe charges API","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The actual functionality of /api/v1/stripe/charges/18 ('Premium API Access') is undocumented and unclear","No examples of expected input or output are provided anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/18","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/stripe/charges/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality of this specific endpoint ('stripe/charges/18') is unclear. The docs, pricing, and README pages are all blank beyond a wallet connect 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'/api/v1/stripe/charges/18':110 '/docs':172 '/pricing':173 '/readme':176 '/request':19,38 '0.02':18,37,94,136 '000':125 '0x8335':130 '20':124 '2913':131 'Base network API' 'USDC micropayment API' 'accept':156 'access':115 'across':53 'actual':206,232 'addit':187 'advertis':120 'ai':12,31,63 'analysi':67 'analyt':11,30,57 'api':5,24,45,114,146 'application/json':162 'awar':229 'base':8,27,104,126,133 'behind':234 'beyond':164 'call':4,23 'categori':55 'challeng':119 'charg':219 'classif':70 'connect':182 'content':188 'convers':87 'data':56,60,220 'document':163,197 'embed':71 'enabl':44 'endpoint':16,35,52,90,108,155,205,236 'equal':135 'estim':81 'exact':143 'exampl':200 'exchang':76 'export':61 'extrem':169 'feed':75 'financ':13,32,72 'four':54 'function':233 'gas':80 'generat':88 'geocod':85 'http':157 'http-post' 'infrastructur':83 'insight':62 'json-response' 'key':147 'label':112 'land':166 'learn':65 'limit':151 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':139 'marketplac':46 'maxamountrequir':122 'may':213 'metric':58 'name':209 'network':105 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':192 'page':167,177 'particular':204 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':99,137,217 'per':3,22,95 'platform':6,25 'post':158 'premium':113 'premium API access' 'price':74,92 'prompt':184 'prospect':225 'quot':79 'rate':77,150 'relat':214 'render':179 'report':59 'request':96,159 'request/response':195 'requir':153 'return':161,207 'schema':196 'scheme':144 'sentiment':66 'settl':98 'spars':170 'spec':193 'specif':107 'stripe':216 'stripe charges API' 'stripe/charges':210 'subscript':148 'suggest':211 'summar':69 'text':68 'token':78 'unconfirm':224 'undocu':238 'unit':127 'usdc':101,129 'usdc-base' 'user':226 'util':15,34,84 'valid':86 'varieti':50 'via':9,28,140 'wallet':183 'web3':73 'x402':10,29,43,118,142 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f42ac9bc-a31a-4e87-8bbe-c23d61430578","listingId":"84e77cef-ccad-4387-b0be-857c3309e8f8","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/stripe/charges/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:06.480Z"}],"sources":[{"listingId":"84e77cef-ccad-4387-b0be-857c3309e8f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:06.480Z","lastSeenAt":"2026-04-22T20:01:24.716Z"}],"details":{"listingId":"84e77cef-ccad-4387-b0be-857c3309e8f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/18 \\\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 for this endpoint specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/18"},{"claim":"The endpoint is described as 'Premium API Access' and accepts HTTP POST returning application/json","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/18"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into agent workflows"],"bestFor":["Developers wanting zero-friction API access without signup","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.354Z"},"updatedAt":"2026-04-22T20:01:24.716Z"}}