{"id":"db007c0b-75ed-4f9e-8d96-1c5b438abca9","shortId":"7PTTDw","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","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 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.\n\nThe specific endpoint at `/api/v1/stripe/charges/54` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02. Payment is made via the x402 exact scheme to the specified payTo address. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive 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 charge data, but this is speculative. Without documentation, the actual functionality of this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","premium API access"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The endpoint path 'stripe/charges/54' is unexplained; actual functionality is unknown","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/54","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/54","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 challenge, but there is zero documentation on what this endpoint actually does or returns. No OpenAPI spec, no request/response examples, and all doc pages render only 'Connect wallet'. The endpoint name 'stripe/charges/54' is opaque without further 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'/request':17,34 '0.02':16,33,106,139 '000':129 '0x8335':134 '20':128 'Base network API' 'USDC API access' 'accept':155 'access':45,118 'actual':222,243 'address':152 'advertis':63,168 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,117,162,189 'application/json':160 'attach':171 'base':7,24,59,130,136 'base-network' 'behind':51 'caller':169 'categori':65 'challeng':124 'charg':234 'classif':82 'connect':198 'content':204 'convers':99 'data':9,26,68,72,235 'doc':188 'document':183,213,241 'embed':83 'endpoint':14,31,50,102,111,154,221,247 'equal':138 'estim':93 'exact':146 'exampl':216 'exchang':88 'export':73 'extrem':185 'feed':87 'financ':11,28,84 'four':64 'function':244 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'header':176 'infrastructur':95 'insight':74 'json-response' 'key':163 'label':115 'learn':77 'limit':166 'list':104 'live':122 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'made':142 'marketplac':42 'may':229 'metric':70 'micropay':56 'micropayment API' 'name':225 'network':60 'no-api-key' 'offer':8,25 'openapi':208 'page':193 'particular':220 'pay-per-request API' 'payment':140,175,181,233 'payto':151 'per':53,107 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':156 'post-method' 'premium':116 'premium API access' 'price':86,190 'prompt':200 'proof':182 'protocol':40 'quot':91 'rate':89,165 'readm':192 'relat':230 'remain':248 'render':195 'report':71 'request':54,108,125,157 'request/response':211 'return':120,159,223 'schema':212 'scheme':147 'sentiment':78 'simpli':170 'spars':186 'spec':209 'specif':110 'specifi':150 'specul':239 'stripe':232 'stripe/charges':226 'substant':203 'suggest':227 'summar':81 'text':80 'token':90 'unclear':249 'unit':131 'usdc':55,133 'usdc-micropayment' 'util':13,30,96 'valid':98,179 'varieti':48 'via':143 'wallet':199 'web3':85 'without':240 'x':174 'x-payment':173 'x402':2,19,39,123,145,180 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f641be18-7528-4965-9b95-246392d666b0","listingId":"db007c0b-75ed-4f9e-8d96-1c5b438abca9","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:28.850Z"}],"sources":[{"listingId":"db007c0b-75ed-4f9e-8d96-1c5b438abca9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:28.850Z","lastSeenAt":"2026-04-22T18:32:10.180Z"}],"details":{"listingId":"db007c0b-75ed-4f9e-8d96-1c5b438abca9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/54"},{"claim":"Docs, API, pricing, and README pages all render only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API endpoints without subscription or API key management","Making micropayments for individual API requests using USDC on Base","Agent-driven API consumption with x402 payment protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","Anyone without access to USDC on the Base network","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.374Z"},"updatedAt":"2026-04-22T18:32:10.180Z"}}