{"id":"3b178e6a-e764-4d78-94cb-4a5469d74d98","shortId":"gt4G4d","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 a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/171` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no rate limits, and no upfront commitments are required.\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 in 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 specific functionality behind the `/api/v1/stripe/charges/171` path is unclear; the name suggests it may relate to Stripe charge data, but this cannot be confirmed from available materials. The endpoint is live and returns a valid x402 402 challenge.","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","ai"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","USDC pay-per-call","Base network API","micropayment endpoint","402 payment API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no useful content","The specific purpose of /api/v1/stripe/charges/171 is unclear — the 'Premium API Access' label is generic","No request or response examples are available to verify what this endpoint actually returns","Cannot confirm what data or service is provided behind this specific endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/171","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/171","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, but there is no OpenAPI spec, no request/response schema, and no meaningful documentation beyond a landing page listing. The actual functionality of the /api/v1/stripe/charges/171 endpoint is unclear, and all doc pages render only 'Connect wallet' with no 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'/api/v1/stripe/charges/171':67,215 '/docs':179 '/pricing':181 '/readme':183 '/request':17,36,159 '0.02':16,35,78,158 '000':82 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':167 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':171 '20':81 '402':246 '402 payment API' '6':88 'Base network API' 'USDC pay-per-call' 'access':73 'address':166 'advertis':113 'ai':10,29,125 'ai-inference' 'analysi':129 'analyt':119 'api':4,23,45,72,99,117 'avail':209,235 'base':7,26,61,83,173 'base-network' 'behind':53,213 'broader':111 'call':80 'cannot':231 'categori':115 'challeng':247 'charg':227 'classif':132 'commit':107 'confirm':233 'connect':189 'content':195 'contract':170 'convers':149 'cost':75 'data':9,28,118,122,228 'data-analytics' 'decim':89 'document':174,204 'embed':133 'endpoint':14,33,52,65,152,238 'estim':143 'exact':96 'exampl':207 'exchang':138 'export':123 'extrem':176 'feed':137 'financ':11,30,134 'finance-data' 'four':114 'function':212 'gas':142 'gate':3,22,48 'generat':150 'geocod':147 'infrastructur':145 'insight':124 'key':100 'learn':127 'limit':103 'list':69,154 'live':240 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':126 'made':92 'marketplac':46 'materi':236 'may':223 'metric':120 'micropay':58 'micropayment endpoint' 'name':220 'network':62 'no-api-key' 'offer':8,27 'openapi':199 'page':184 'path':216 'payload':208 'payment':90,164 'per':55,79 'per-request':54 'per-request-billing' 'platform':5,24,112 'point':161 'premium':71 'price':136,160 'prompt':191 'protocol':44 'quot':141 'rate':102,139 'relat':224 'render':186 'report':121 'request':56 'request/response':202 'requir':109 'return':242 'schema':203 'scheme':97 'sentiment':128 'settl':163 'spars':177 'spec':200 'specif':64,211 'stripe':226 'suggest':221 'summar':131 'text':130 'token':140 'unclear':218 'unit':84 'upfront':106 'usdc':19,38,57,86,169 'usdc-micropayment' 'util':13,32,146 'utility-services' 'valid':148,244 'varieti':50 'via':18,37,93 'wallet':190 'web3':135 'x402':2,21,43,95,245 'x402 micropayment API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"4638698f-a9f6-4c66-bb9c-c5b186ac7ce2","listingId":"3b178e6a-e764-4d78-94cb-4a5469d74d98","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:02.230Z"}],"sources":[{"listingId":"3b178e6a-e764-4d78-94cb-4a5469d74d98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:02.230Z","lastSeenAt":"2026-04-22T15:01:52.566Z"}],"details":{"listingId":"3b178e6a-e764-4d78-94cb-4a5469d74d98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/171 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/171"},{"claim":"All endpoints are listed at $0.02/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/171"}],"useCases":["Accessing data analytics and metrics via per-request USDC micropayments","Running AI inference tasks (sentiment, summarization, classification, embeddings) without API key signup","Fetching financial data like token quotes, exchange rates, and gas estimates on a pay-as-you-go basis","Using utility services like geocoding and validation with no rate limits"],"bestFor":["Developers wanting pay-per-call API access without subscriptions or API keys","Agents and bots that can settle x402 payments in USDC on Base","Quick prototyping where low-friction, no-signup API access is valuable"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who cannot transact in USDC on the Base network","Applications needing guaranteed response schemas or versioned contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.589Z"},"updatedAt":"2026-04-22T15:01:52.566Z"}}