{"id":"0905c5de-6c6a-4167-b760-d960419a16ea","shortId":"4VeE94","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/199` is labeled \"Premium API Access\" and costs $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 subscriptions 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 listed endpoints share the same $0.02/request pricing. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nDocumentation is extremely sparse — the docs, pricing, API, 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 usage examples available from the crawled pages. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what the `/api/v1/stripe/charges/199` endpoint actually returns upon successful payment is unknown from the available material.","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","crypto-payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","402 payment API"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema available — request and response formats are completely unknown.","The specific purpose of /api/v1/stripe/charges/199 is unclear; 'Premium API Access' is a generic label.","The platform lists many endpoint categories but it is unverified whether they all function as advertised."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/199","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/199","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 via a valid 402 x402 challenge, but documentation is effectively nonexistent — all doc pages return only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint ('/api/v1/stripe/charges/199') is unclear beyond the generic 'Premium API Access' 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'/request':17,36,155 '0.02':16,35,77,154 '000':81 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':161 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':164 '20':80 '402':215 '402 payment API' '6':87 'Base network API' 'USDC API access' 'access':49,74 'actual':223 'address':160 'advertis':110 'ai':10,29,122 'ai-inference' 'analysi':126 'analyt':116 'api':4,23,45,73,98,114,174 'avail':202,232 'base':7,26,63,82,166 'base-network' 'behind':55 'broader':108 'call':79 'categori':112 'challeng':217 'classif':129 'confirm':210 'connect':182 'content':188 'convers':146 'cost':76 'crawl':205 'data':9,28,115,119 'data-analytics' 'decim':88 'doc':172 'document':167,197 'embed':130 'endpoint':14,33,54,67,150,208,222 'estim':140 'exact':95 'exampl':201 'exchang':135 'export':120 'extrem':169 'feed':134 'financ':11,30,131 'finance-data' 'four':111 'gas':139 'gate':3,22,48 'generat':147 'geocod':144 'infrastructur':142 'insight':121 'key':99 'label':71 'learn':124 'limit':102 'list':149 'live':211 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'made':91 'marketplac':46 'materi':233 'metric':117 'micropay':60 'micropayment API' 'network':64 'no-api-key' 'offer':8,27 'openapi':192 'page':177,206 'pay-per-call API' 'payment':89,157,227 'per':57,78 'per-request':56 'per-request-billing' 'platform':5,24,109 'premium':72 'price':133,156,173 'prompt':184 'proper':214 'protocol':44 'quot':138 'rate':101,136 'readm':176 'render':179 'report':118 'request':58 'request/response':195 'requir':106 'return':212,224 'schema':196 'scheme':96 'sentiment':125 'settl':158 'share':151 'spars':170 'spec':193 'specif':66 'subscript':105 'success':226 'summar':128 'text':127 'token':137 'unit':83 'unknown':229 'upon':225 'usag':200 'usdc':19,38,59,85,163 'usdc-micropayment' 'use':162 'util':13,32,143 'utility-services' 'valid':145 'varieti':52 'via':18,37,92 'wallet':183 'web3':132 'x402':2,21,43,94,216 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"75d1f280-b74c-4a13-8bc6-f11fb4e62410","listingId":"0905c5de-6c6a-4167-b760-d960419a16ea","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/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:23.455Z"}],"sources":[{"listingId":"0905c5de-6c6a-4167-b760-d960419a16ea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:23.455Z","lastSeenAt":"2026-04-22T04:01:53.472Z"}],"details":{"listingId":"0905c5de-6c6a-4167-b760-d960419a16ea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/199 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/199"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/199"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reporting endpoints without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a pay-per-use basis","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion"],"bestFor":["Developers who want pay-per-request API access without API keys or rate limits","Agents and bots that can settle x402 micropayments in USDC on Base","Prototyping and low-volume usage where subscription plans are unnecessary"],"notFor":["High-volume production workloads where per-request crypto payments add latency and cost overhead","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.614Z"},"updatedAt":"2026-04-22T04:01:53.472Z"}}