{"id":"9f31857f-8a14-4841-a01d-9c50c95f78f2","shortId":"stFyV4","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/35` is listed as \"Premium API Access\" and requires a maximum of 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 upfront commitments 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 the same USDC contract on Base (0x8335…2913).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body the POST endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","USDC api access","base network api","stripe charges api"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found; request body and response format are unknown","The endpoint path '/api/v1/stripe/charges/35' suggests Stripe integration but no details are documented","Cannot verify what this specific endpoint actually does beyond the generic 'Premium API Access' description"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/35","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/35","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 402 x402 challenge, but documentation is effectively nonexistent — all doc pages show 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/35') is unclear beyond the generic 'Premium API Access' 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'/api/v1/stripe/charges/35':69 '/docs':180 '/pricing':182 '/readme':184 '/request':17,36,160 '0.02':16,35,87,159 '000':82 '0x8335':173 '20':81 '2913':174 '402':224 'USDC api access' 'access':49,75 'advertis':114 'ai':10,29,126 'analysi':130 'analyt':120 'api':4,23,45,74,100,118 'avail':211 'base':7,26,63,83,172 'base network api' 'base-network' 'behind':55 'bodi':235 'broader':112 'call':90 'categori':116 'challeng':226 'classif':133 'commit':108 'confirm':219 'connect':190 'content':215 'contract':170 'convers':150 'crawl':214 'data':9,28,119,123 'detail':197 'document':175,206,229 'embed':134 'endpoint':14,33,54,67,153,217,238 'estim':144 'exact':97 'exampl':210 'exchang':139 'expect':239 'export':124 'extrem':177 'feed':138 'financ':11,30,135 'four':115 'gas':143 'gate':3,22,48 'generat':151 'geocod':148 'infrastructur':146 'insight':125 'key':101 'learn':128 'limit':104 'list':71,155 'live':220 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'made':93 'marketplac':46 'maximum':79 'metric':121 'micropay':60 'micropayment api' 'need':110 'network':64 'no-api-key' 'offer':8,27 'openapi':201 'page':185 'pay-per-request api' 'payload':243 'payment':91,165 'per':57,89 'per-request':56 'per-request-billing' 'platform':5,24,113 'point':162 'post':237 'post-endpoint' 'premium':73 'price':137,161 'prompt':192 'proper':223 'protocol':44 'quot':142 'rate':103,140 'render':187 'report':122 'request':58,234 'request/response':204 'requir':77 'respons':242 'return':221,245 'schema':205 'scheme':98 'sentiment':129 'settl':164 'spars':178 'spec':202 'specif':66 'stripe charges api' 'summar':132 'technic':196 'text':131 'token':141 'unclear':232 'unit':84 'upfront':107 'usag':209 'usd':88 'usdc':19,38,59,86,169 'usdc-micropayment' 'util':13,32,147 'valid':149 'varieti':52 'via':18,37,94 'wallet':191 'web3':136 'without':228 'x402':2,21,43,96,225 'x402 api' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"e08b1a20-1af0-4864-a6f5-131168f6663b","listingId":"9f31857f-8a14-4841-a01d-9c50c95f78f2","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:21.637Z"}],"sources":[{"listingId":"9f31857f-8a14-4841-a01d-9c50c95f78f2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:21.637Z","lastSeenAt":"2026-04-22T18:32:09.554Z"}],"details":{"listingId":"9f31857f-8a14-4841-a01d-9c50c95f78f2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/35 \\\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/35"},{"claim":"All endpoints are priced 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 across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/35"}],"useCases":["Paying per-request for premium API access without needing API keys or subscriptions","Integrating x402-compatible agents that autonomously pay for API calls on Base","Accessing a variety of data, AI, finance, and utility endpoints via micropayments"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible wallets and autonomous agents on Base","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.759Z"},"updatedAt":"2026-04-22T18:32:09.554Z"}}