{"id":"f80128ff-4771-49c1-a60f-c536a64a2f87","shortId":"5jSWr5","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/34` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain via USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $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 for what this specific endpoint returns or what input it expects. The endpoint path (`/stripe/charges/34`) suggests it may relate to Stripe charge creation or retrieval, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe charges API","crypto-gated API"],"warnings":["No OpenAPI schema or detailed documentation available for any endpoint","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific function of /api/v1/stripe/charges/34 ('Premium API Access') is undocumented — the path suggests Stripe charge operations but this is unconfirmed","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/34","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/34","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 no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The specific purpose of this endpoint (/stripe/charges/34) is 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'/api/v1/stripe/charges/34':65 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34 '/stripe/charges/34':223 '0.02':16,33,97,160 '000':92 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':85 '20':91 '6':101 'Base network API' 'USDC API access' 'accept':73 'access':45,71 'advertis':117 'ai':10,27,129 'amount':89 'analysi':133 'analyt':123 'api':4,21,41,70,121,165 'base':7,24,59,93 'base-network' 'behind':51 'broader':115 'captur':108 'categori':119 'chain':81 'challeng':105 'charg':230 'classif':136 'commit':173 'confirm':109 'connect':190 'content':196 'contract':84 'convers':153 'creation':231 'crypto-gated API' 'data':9,26,122,126 'decim':102 'detail':207 'document':175,208,242 'embed':137 'endpoint':14,31,50,63,111,156,213,221 'equal':96 'estim':147 'exampl':204 'exchang':142 'expect':219 'export':127 'extrem':177 'feed':141 'financ':11,28,138 'four':118 'gas':146 'gate':3,20,44 'generat':154 'geocod':151 'given':238 'infrastructur':149 'input':217 'insight':128 'json-response' 'key':166 'lack':240 'learn':131 'limit':169 'list':67,158 'live':113 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':130 'marketplac':42 'maximum':88 'may':226 'metric':124 'micropay':56 'micropayment API' 'minimum':172 'network':60 'no-api-key' 'offer':8,25 'on-chain':79 'openapi':200 'page':185 'path':222 'pay-per-request API' 'payment':76 'per':53,161 'per-request':52 'per-request-billing' 'platform':5,22,116 'post':74 'post-endpoint' 'premium':69 'price':140 'prompt':192 'protocol':40 'quot':145 'rate':143,168 'relat':227 'render':187 'report':125 'request':54,75,162 'request/response':203 'requir':174 'retriev':233 'return':214 'schema':201 'sentiment':132 'settl':78 'spars':178 'specif':62,212 'specul':237 'stripe':229 'stripe charges API' 'success':107 'suggest':224 'summar':135 'text':134 'token':144 'unit':94 'usd':98 'usdc':55,83,99 'usdc-micropayment' 'use':100 'util':13,30,150 'valid':152 'varieti':48 'via':82 'wallet':191 'web3':139 'x402':2,19,39,104 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"33b31f9b-1645-4691-9b19-08b6e7e7a6d9","listingId":"f80128ff-4771-49c1-a60f-c536a64a2f87","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:24.083Z"}],"sources":[{"listingId":"f80128ff-4771-49c1-a60f-c536a64a2f87","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:24.083Z","lastSeenAt":"2026-04-22T18:32:09.666Z"}],"details":{"listingId":"f80128ff-4771-49c1-a60f-c536a64a2f87","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/34 \\\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/34"},{"claim":"All endpoints 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":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/34"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want instant API access without signup or API keys","AI agents that can settle x402 payments autonomously on Base","Users comfortable with on-chain USDC micropayments for low-cost API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-volume calls where per-request crypto settlement adds latency","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.612Z"},"updatedAt":"2026-04-22T18:32:09.666Z"}}