{"id":"2395e448-49db-421e-8854-8c326f850d5c","shortId":"fXNWSE","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/187` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or upfront commitments required.\n\nThe broader platform advertises four categories of endpoints: 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. However, this particular listing covers only the `/api/v1/stripe/charges/187` endpoint, whose specific functionality beyond \"Premium API Access\" is not documented.\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 usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; the actual functionality of /api/v1/stripe/charges/187 is undocumented","The endpoint path includes 'stripe/charges' which may imply interaction with Stripe payment infrastructure, but this is unconfirmed","All other listed endpoints on the platform share identical $0.02 pricing and similarly lack documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/187","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/187","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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what the endpoint actually returns. The docs pages are all empty wallet-connect stubs. The endpoint's purpose beyond its title is entirely 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'/api/v1/stripe/charges/187':69,182 '/docs':199 '/pricing':201 '/readme':203 '/request':17,36,173 '0.02':16,35,100,172 '000':89 '0x8335':94 '20':88 '2913':95 '402':242 '6':105 'Base network API' 'USDC API access' 'accept':77 'access':49,75,190 'actual':251 'advertis':128 'ai':10,29,140 'analysi':144 'analyt':134 'api':4,23,45,74,117,189 'avail':229 'base':7,26,63,90,97 'base-network' 'behind':55 'beyond':187 'broader':126 'call':102 'categori':130 'challeng':82,244 'classif':147 'commit':123 'confirm':237 'connect':209 'content':215 'convers':164 'cost':86 'cover':179 'crawl':232 'data':9,28,133,137,247 'decim':106 'document':193,194,224 'embed':148 'endpoint':14,33,54,67,132,168,183,235 'equal':99 'estim':158 'exact':113 'exampl':228 'exchang':153 'export':138 'extrem':196 'feed':152 'financ':11,30,149 'four':129 'function':186 'gas':157 'gate':3,22,48 'generat':165 'geocod':162 'howev':175 'indic':83 'infrastructur':160 'insight':139 'key':118 'learn':142 'limit':120 'list':71,167,178 'live':238 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':141 'made':109 'marketplac':46 'materi':233 'maximum':85 'metric':135 'micropay':60 'micropayment API' 'network':64 'no-api-key' 'offer':8,27 'openapi':219 'page':204 'particular':177 'pay-per-request API' 'payment':107,255 'per':57,101 'per-request':56 'per-request-billing' 'platform':5,24,127 'post':78 'post-endpoint' 'premium':73,188 'price':151,174 'prompt':211 'proper':241 'protocol':44 'quot':156 'rate':119,154 'render':206 'report':136 'request':58,79 'request/response':222 'requir':124 'return':239,252 'schema':223 'scheme':114 'sentiment':143 'servic':249 'share':169 'spars':197 'spec':220 'specif':66,185 'success':254 'summar':146 'text':145 'token':155 'unit':91 'unknown':257 'upfront':122 'upon':253 'usag':227 'usdc':19,38,59,93,103 'usdc-micropayment' 'use':104 'util':13,32,161 'valid':163 'varieti':52 'via':18,37,110 'wallet':210 'web3':150 'whose':184 'x402':2,21,43,81,112,243 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"b01314ac-267f-4f1c-86f9-8ccc2cfb98f5","listingId":"2395e448-49db-421e-8854-8c326f850d5c","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/187","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:18.623Z"}],"sources":[{"listingId":"2395e448-49db-421e-8854-8c326f850d5c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/187","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:18.623Z","lastSeenAt":"2026-04-22T18:32:09.293Z"}],"details":{"listingId":"2395e448-49db-421e-8854-8c326f850d5c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/187 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/187"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents that autonomously purchase API calls with USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want no-commitment API usage"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.881Z"},"updatedAt":"2026-04-22T18:32:09.293Z"}}