{"id":"eaa3d612-cbef-4f2d-8fba-386bac7b650f","shortId":"Q2d24e","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 collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/178` 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…), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\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 exact functionality behind the `/api/v1/stripe/charges/178` path is unclear; the name suggests it may relate to Stripe charge data, but no specifics are available. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","low payment fee"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages are all empty","No OpenAPI or JSON schema describing request parameters or response format","The endpoint path '/api/v1/stripe/charges/178' suggests Stripe charge data but no details confirm this","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/178","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/178","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint is unclear, making this effectively a stub 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'/api/v1/stripe/charges/178':69,217 '/docs':180 '/pricing':182 '/readme':184 '/request':17,36 '0.02':16,35,97,160 '000':89 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':108 '0x8335':94 '20':88 '300':111 '402':244 '6':102 'Base network API' 'USDC API access' 'accept':77 'access':49,75 'advertis':117 'ai':10,29,129 'analysi':133 'analyt':123 'api':4,23,45,74,121,165 'avail':235 'base':7,26,63,90 'base-network' 'behind':55,215 'broader':115 'call':99 'categori':119 'challeng':82,245 'charg':229 'classif':136 'collect':52 'commit':173 'confirm':239 'connect':190 'content':196 'convers':153 'cost':86 'data':9,28,122,126,230 'decim':103 'detail':207 'document':175,208 'embed':137 'endpoint':14,33,54,67,156,211,237 'equal':96 'estim':147 'exact':213 'exampl':204 'exchang':142 'export':127 'extrem':177 'feed':141 'financ':11,30,138 'four':118 'function':214 'gas':146 'gate':3,22,48 'generat':154 'geocod':151 'indic':83 'infrastructur':149 'insight':128 'key':166 'learn':131 'limit':169 'list':71,158 'live':240 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':130 'marketplac':46 'maximum':85 'may':225 'metric':124 'micropay':60 'micropayment API' 'minimum':172 'name':222 'network':64 'no-api-key' 'offer':8,27 'openapi':200 'page':185 'path':218 'pay-per-request API' 'payment':104 'per':57,98,161 'per-request':56 'per-request-billing' 'platform':5,24,116 'post':78 'post-endpoint' 'premium':73 'price':140 'prompt':192 'protocol':44 'quot':145 'rate':143,168 'relat':226 'render':187 'report':125 'request':58,79,162 'request/response':203 'requir':174 'respons':246 'schema':201 'second':112 'sent':106 'sentiment':132 'spars':178 'specif':66,233 'stripe':228 'suggest':223 'summar':135 'text':134 'timeout':113 'token':144 'unclear':220 'unit':91 'usdc':19,38,59,93,100 'usdc-micropayment' 'use':101 'util':13,32,150 'valid':152,243 'via':18,37,241 'wallet':191 'web3':139 'x402':2,21,43,81 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"6b227e3f-e736-48c4-8565-82701dbd3875","listingId":"eaa3d612-cbef-4f2d-8fba-386bac7b650f","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/178","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:07.699Z"}],"sources":[{"listingId":"eaa3d612-cbef-4f2d-8fba-386bac7b650f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/178","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:07.699Z","lastSeenAt":"2026-04-22T20:01:24.765Z"}],"details":{"listingId":"eaa3d612-cbef-4f2d-8fba-386bac7b650f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/178 \\\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 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/178"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","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":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.354Z"},"updatedAt":"2026-04-22T20:01:24.765Z"}}