{"id":"8b778e68-544d-4a2e-ba59-6c65536e0850","shortId":"ntT89c","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/162` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain to a specified wallet address using USDC (contract 0x8335…2913 on Base), with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals).\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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific purpose of the `/api/v1/stripe/charges/162` endpoint (labeled \"Premium API Access\") is unclear and does not appear in the main site's listed API catalog, making it difficult to determine what data or functionality it actually provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["payments","general"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe charges API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema provided for any endpoint.","The specific endpoint /api/v1/stripe/charges/162 is not listed in the site's public API catalog; its actual functionality is unknown.","No request or response examples are available anywhere in the crawled material.","The endpoint name references 'stripe/charges' which may imply Stripe payment processing, but the x402 challenge uses on-chain USDC — the relationship is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/162","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint path does not appear in the site's own catalog. The purpose of 'Premium API Access' at /api/v1/stripe/charges/162 is entirely 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'/api/v1/stripe/charges/162':68,217 '/docs':180 '/pricing':182 '/readme':184 '/request':17,36 '0.02':16,35,108,160 '000':103 '0x8335':93 '20':102 '2913':94 '6':112 'Base network API' 'USDC API access' 'accept':76 'access':48,74,222 'actual':247 'address':89 'advertis':117 'ai':10,29,129 'amount':100 'analysi':133 'analyt':123 'api':4,23,44,73,121,165,221,235 'appear':228 'base':7,26,62,96,104 'base-network' 'behind':54 'broader':115 'catalog':236 'categori':119 'chain':84 'classif':136 'commit':173 'connect':190 'content':196 'contract':92 'convers':153 'data':9,28,122,126,243 'decim':113 'detail':207 'determin':241 'difficult':239 'document':175,208 'embed':137 'endpoint':14,33,53,66,156,211,218 'equival':106 'estim':147 'exampl':204 'exchang':142 'export':127 'extrem':177 'feed':141 'financ':11,30,138 'four':118 'function':245 'gas':146 'gate':3,22,47 'generat':154 'geocod':151 'infrastructur':149 'insight':128 'key':166 'label':219 'learn':131 'limit':169 'list':70,158,234 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':130 'main':231 'make':237 'marketplac':45 'maximum':99 'metric':124 'micropay':59 'micropayment API' 'minimum':172 'network':63 'no-api-key' 'offer':8,27 'on-chain':82 'openapi':200 'page':185 'pay-per-request API' 'payment':79 'per':56,161 'per-request':55 'per-request-billing' 'platform':5,24,116 'post':77 'post-endpoint' 'premium':72,220 'price':140 'prompt':192 'protocol':43 'provid':248 'purpos':214 'quot':145 'rate':143,168 'render':187 'report':125 'request':57,78,162 'request/response':203 'requir':174 'schema':201 'sentiment':132 'settl':81 'site':232 'spars':178 'specif':65,213 'specifi':87 'stripe charges API' 'summar':135 'text':134 'token':144 'unclear':224 'unit':105 'usd':109 'usdc':19,38,58,91,110 'usdc-micropayment' 'use':90,111 'util':13,32,150 'valid':152 'varieti':51 'via':18,37 'wallet':88,191 'web3':139 'x402':2,21,42 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"56093b60-e2a4-4357-947c-d6e883d5a3d7","listingId":"8b778e68-544d-4a2e-ba59-6c65536e0850","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/162","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:12.489Z"}],"sources":[{"listingId":"8b778e68-544d-4a2e-ba59-6c65536e0850","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/162","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:12.489Z","lastSeenAt":"2026-04-22T07:01:20.794Z"}],"details":{"listingId":"8b778e68-544d-4a2e-ba59-6c65536e0850","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/162 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/162"},{"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":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to gated API services without traditional API key registration","Agent-driven workflows that need on-demand, per-call payment without subscriptions","Testing x402 protocol integrations on Base network"],"bestFor":["Developers exploring x402 micropayment-gated APIs","Agents that need keyless, pay-per-use API access","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or schemas before integrating","Production workloads requiring guaranteed SLAs or support","Anyone needing free or trial access to evaluate endpoint behavior first"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.12Z"},"updatedAt":"2026-04-22T07:01:20.794Z"}}