{"id":"9021ae2a-898f-404e-aeee-3f8b9b6febb2","shortId":"xKkWSR","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 specific endpoint at `/api/v1/stripe/charges/98` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals). The x402 challenge was successfully captured, confirming the endpoint is live.\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 available. The actual functionality behind this specific endpoint path (`/stripe/charges/98`) is unclear; the name suggests it may relate to Stripe charge processing, but no documentation confirms what input it expects or what it returns.","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","stripe charges API"],"warnings":["No OpenAPI schema or endpoint documentation available","The /docs, /pricing, /api, and /README pages contain no useful content beyond a wallet connect prompt","The specific endpoint path '/api/v1/stripe/charges/98' purpose is unclear — the name suggests Stripe charge processing but no documentation confirms functionality","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/98","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation beyond the landing page listing. No OpenAPI schema, no request/response examples, and the specific endpoint's purpose is ambiguous. The docs, pricing, and README pages are all empty wallet-connect 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'/api/v1/stripe/charges/98':64 '/docs':181 '/pricing':183 '/readme':185 '/request':17,34 '/stripe/charges/98':219 '0.02':16,33,98,161 '000':93 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':84 '20':92 '6':102 'Base network API' 'USDC API access' 'accept':72 'access':44,70 'actual':212 'advertis':118 'ai':10,27,130 'amount':90 'analysi':134 'analyt':124 'api':4,21,40,69,122,166 'avail':210 'base':7,24,58,86,94 'base-network' 'behind':50,214 'broader':116 'captur':109 'categori':120 'chain':80 'challeng':106 'charg':230 'classif':137 'commit':174 'confirm':110,235 'connect':191 'content':197 'contract':83 'convers':154 'data':9,26,123,127 'decim':103 'detail':208 'document':176,209,234 'embed':138 'endpoint':14,31,49,62,112,157,217 'equival':96 'estim':148 'exampl':205 'exchang':143 'expect':239 'export':128 'extrem':178 'feed':142 'financ':11,28,139 'four':119 'function':213 'gas':147 'gate':3,20,43 'generat':155 'geocod':152 'infrastructur':150 'input':237 'insight':129 'key':167 'learn':132 'limit':170 'list':66,159 'live':114 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':131 'marketplac':41 'maximum':89 'may':226 'metric':125 'micropay':55 'micropayment API' 'minimum':173 'name':223 'network':59 'no-api-key' 'offer':8,25 'on-chain':78 'openapi':201 'page':186 'path':218 'pay-per-request API' 'payment':75 'per':52,162 'per-request':51 'per-request-billing' 'platform':5,22,117 'post':73 'post-endpoint' 'premium':68 'price':141 'process':231 'prompt':193 'protocol':39 'quot':146 'rate':144,169 'relat':227 'render':188 'report':126 'request':53,74,163 'request/response':204 'requir':175 'return':243 'schema':202 'sentiment':133 'settl':77 'spars':179 'specif':61,216 'stripe':229 'stripe charges API' 'success':108 'suggest':224 'summar':136 'text':135 'token':145 'unclear':221 'unit':95 'usd':99 'usdc':54,82,100 'usdc-micropayment' 'use':101 'util':13,30,151 'valid':153 'varieti':47 'via':81 'wallet':192 'web3':140 'x402':2,19,38,105 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"9f5a62a7-544e-4f40-8721-33297a18f9bf","listingId":"9021ae2a-898f-404e-aeee-3f8b9b6febb2","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/98","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:43.353Z"}],"sources":[{"listingId":"9021ae2a-898f-404e-aeee-3f8b9b6febb2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/98","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:43.353Z","lastSeenAt":"2026-04-22T18:32:11.192Z"}],"details":{"listingId":"9021ae2a-898f-404e-aeee-3f8b9b6febb2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/98 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/98"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/98"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating on-chain micropayment-gated services into agent workflows","Accessing premium API functionality via x402 protocol on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 USDC payments on Base","Projects needing low-cost per-call API billing without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.595Z"},"updatedAt":"2026-04-22T18:32:11.192Z"}}