{"id":"bb402465-c3d5-4b4d-a2b3-48fe17ef032a","shortId":"WbzLCP","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/118` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are needed.\n\nThe broader platform advertises four categories of APIs: 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 listed at the same $0.02/request price point and settle payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API access","Base network API","stripe charges API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt","No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/stripe/charges/118 ('Premium API Access') is undocumented","No request or response examples could be obtained","The endpoint path includes 'stripe/charges' which may imply Stripe integration but this is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/118","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific 'Premium API Access' endpoint at /stripe/charges/118 is unclear. The platform lists many endpoints but provides no technical detail for any of 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'/api/v1/stripe/charges/118':69 '/docs':181 '/pricing':183 '/readme':185 '/request':17,36,161 '0.02':16,35,89,160 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':173 '20':83 '402':220 'Base network API' 'USDC API access' 'access':49,75 'address':168 'advertis':115 'ai':10,29,127 'ai-inference' 'analysi':131 'analyt':121 'api':4,23,45,74,102,119 'avail':211 'base':7,26,63,85,175 'base-network' 'behind':55 'bodi':231 'broader':113 'call':92 'categori':117 'challeng':222 'classif':134 'confirm':215 'connect':191 'content':197 'contract':172 'convers':151 'data':9,28,120,124 'data-analytics' 'document':176,206,225 'embed':135 'endpoint':14,33,54,67,154,213,234 'estim':145 'exact':99 'exampl':209 'exchang':140 'expect':235 'export':125 'extrem':178 'feed':139 'financ':11,30,136 'finance-data' 'four':116 'gas':144 'gate':3,22,48 'generat':152 'geocod':149 'infrastructur':147 'insight':126 'key':103 'learn':129 'limit':106 'list':71,156 'live':216 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':128 'made':95 'marketplac':46 'metric':122 'micropay':60 'need':111 'network':64 'no-api-key' 'offer':8,27 'openapi':201 'page':186 'pay-per-request API' 'payload':210 'payment':79,93,166 'per':57,91 'per-request':56 'per-request-billing' 'platform':5,24,114 'point':163 'premium':73 'price':138,162 'prompt':193 'proper':219 'protocol':44 'quot':143 'rate':105,141 'render':188 'report':123 'request':58,230 'request/response':204 'requir':77 'respons':238 'return':217,240 'schema':205 'scheme':100 'sentiment':130 'settl':165 'spars':179 'spec':202 'specif':66,233 'stripe charges API' 'subscript':109 'summar':133 'text':132 'token':142 'unclear':228 'unit':86 'usd':90 'usdc':19,38,59,88,171 'usdc-micropayment' 'use':170 'util':13,32,148 'utility-services' 'valid':150 'varieti':52 'via':18,37,96 'wallet':192 'web3':137 'without':224 'x402':2,21,43,98,221 'x402 micropayment API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"0be2217f-8df3-4b3e-8a1f-47300a088b8b","listingId":"bb402465-c3d5-4b4d-a2b3-48fe17ef032a","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/118","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:51.289Z"}],"sources":[{"listingId":"bb402465-c3d5-4b4d-a2b3-48fe17ef032a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/118","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:51.289Z","lastSeenAt":"2026-04-22T20:01:24.135Z"}],"details":{"listingId":"bb402465-c3d5-4b4d-a2b3-48fe17ef032a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/118 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/118"},{"claim":"All listed APIs 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 platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/118"}],"useCases":["Paying per-request for data analytics without managing API keys or subscriptions","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) via micropayments","Fetching real-time crypto gas estimates or token quotes with USDC micropayments","Using geocoding or data conversion utilities on a pay-as-you-go basis"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Projects needing lightweight access to multiple API categories without onboarding"],"notFor":["Production workloads requiring documented request/response schemas and SLAs","Users who need detailed API documentation or OpenAPI specs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.128Z"},"updatedAt":"2026-04-22T20:01:24.135Z"}}