{"id":"cdb21b43-8193-4988-8f17-9539dfc08ea6","shortId":"ePL8Ej","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/59` 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 request (USDC uses 6 decimals). Payment is made via the x402 exact scheme 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 returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The exact functionality behind the `/api/v1/stripe/charges/59` endpoint name is unclear; the \"stripe/charges\" path suggests it may relate to Stripe payment processing, but no further details are available.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["payments","infrastructure"],"synonyms":["micropayment API","pay-per-request API","x402 endpoint","USDC API access","Base network API","low fee API","crypto payment gateway"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint path '/api/v1/stripe/charges/59' suggests Stripe charge functionality but no details are provided","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/59","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of the specific '/api/v1/stripe/charges/59' path is ambiguous. This is effectively a stub 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'/api/v1/stripe/charges/59':69,224 '/docs':186 '/pricing':188 '/readme':190 '/request':17,36 '0.02':16,35,100,166 '000':89 '0x8335':94 '20':88 '2913':95 '300':117 '6':105 'Base network API' 'USDC API access' 'accept':77 'access':49,75 'advertis':123 'ai':10,29,135 'analysi':139 'analyt':129 'api':4,23,45,74,127,171 'avail':215,245 'base':7,26,63,90,97 'base-network' 'behind':55,222 'broader':121 'categori':125 'challeng':82 'classif':142 'commit':179 'connect':196 'content':202 'convers':159 'cost':86 'crawl':218 'crypto payment gateway' 'data':9,28,128,132 'decim':106 'detail':213,243 'document':181,214 'embed':143 'endpoint':14,33,54,67,162,225 'equal':99 'estim':153 'exact':113,220 'exampl':210 'exchang':148 'export':133 'extrem':183 'feed':147 'financ':11,30,144 'four':124 'function':221 'gas':152 'gate':3,22,48 'generat':160 'geocod':157 'indic':83 'infrastructur':155 'insight':134 'json-response' 'key':172 'learn':137 'limit':175 'list':71,164 'low fee API' 'lowpaymentfee.com':39 'machin':136 'made':109 'marketplac':46 'maximum':85 'may':234 'metric':130 'micropay':60 'micropayment API' 'minimum':178 'name':226 'network':64 'no-api-key' 'offer':8,27 'openapi':206 'page':191 'path':231 'pay-per-request API' 'payment':107,238 'per':57,101,167 'per-request':56 'per-request-billing' 'platform':5,24,122 'post':78 'post-endpoint' 'premium':73 'price':146 'process':239 'prompt':198 'protocol':44 'quot':151 'rate':149,174 'relat':235 'report':131 'request':58,79,102,168 'request/response':209 'requir':180 'return':193 'schema':207 'scheme':114 'second':118 'sentiment':138 'spars':184 'specif':66 'stripe':237 'stripe/charges':230 'substant':201 'suggest':232 'summar':141 'text':140 'timeout':119 'token':150 'unclear':228 'unit':91 'usdc':19,38,59,93,103 'usdc-micropayment' 'use':104 'util':13,32,156 'valid':158 'varieti':52 'via':18,37,110 'wallet':197 'web3':145 'x402':2,21,43,81,112 'x402 endpoint' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"17a90fb8-ee53-4b96-be88-e99ad7e97b5e","listingId":"cdb21b43-8193-4988-8f17-9539dfc08ea6","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:31.279Z"}],"sources":[{"listingId":"cdb21b43-8193-4988-8f17-9539dfc08ea6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:31.279Z","lastSeenAt":"2026-04-22T23:01:56.417Z"}],"details":{"listingId":"cdb21b43-8193-4988-8f17-9539dfc08ea6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/59 \\\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/59"},{"claim":"All endpoints listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/59"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with low-cost utility endpoints","Accessing data, AI, or finance APIs via USDC micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents using x402 protocol for autonomous API consumption","Projects needing low-cost per-call pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up significantly compared to subscription-based alternatives"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.25Z"},"updatedAt":"2026-04-22T23:01:56.417Z"}}