{"id":"9a91c2fa-ff8c-4eb1-9c34-8cfaeaf45fa2","shortId":"649sLz","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/97` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. Payment is made via an `X-PAYMENT` header using the x402 \"exact\" scheme, with no API keys or rate limits 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 endpoints are listed at the same $0.02/request price point. The x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests.\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 description of what the `/api/v1/stripe/charges/97` endpoint actually returns or what input it expects. The endpoint path suggests it may relate to Stripe charge data, but this is speculative. Without documentation or example payloads, the actual functionality of this specific endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","stripe charges API","402 payment required"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided for any endpoint","The purpose of /api/v1/stripe/charges/97 is unclear from the endpoint path alone; it does not appear in the site's listed API catalog","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/97","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/97","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 confirms pricing and payment details, but there is zero documentation for this specific endpoint — no request schema, no response schema, no examples, and no description of what it actually does. The docs/pricing/README pages are all empty wallet-connect 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'/api/v1/stripe/charges/97':65,212 '/docs':181 '/pricing':183 '/readme':185 '/request':16,34,158 '0.02':15,33,84,157 '000':78 '20':77 '402 payment required' 'Base network API' 'USDC micropayment API' 'accept':173 'access':71 'actual':214,242 'advertis':112 'ai':9,27,124 'analysi':128 'analyt':8,26,118 'api':4,22,46,70,103 'base':7,25,59,79 'base-network' 'broader':110 'call':45 'captur':166 'categori':114 'challeng':163 'charg':230 'classif':131 'collect':40 'confirm':167 'connect':191 'content':197 'convers':148 'data':117,121,231 'descript':208 'document':176,237 'embed':132 'endpoint':13,31,47,63,116,151,169,213,222,247 'estim':142 'exact':99 'exampl':205,239 'exchang':137 'expect':220 'export':122 'extrem':178 'feed':136 'financ':10,28,133 'four':113 'function':243 'gas':141 'gate':3,21,48 'generat':149 'geocod':146 'header':95 'host':38 'i.e':83 'infrastructur':144 'input':218 'insight':123 'json-response' 'key':104 'learn':126 'limit':107 'list':67,153 'live':171 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':125 'made':89 'maximum':75 'may':226 'metric':119 'network':60 'no-api-key' 'openapi':201 'page':186 'path':223 'pay':43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payload':240 'payment':54,87,94 'per':44,85 'platform':111 'point':160 'post':174 'post-method' 'premium':69 'price':135,159 'prompt':193 'protocol':52 'quot':140 'rate':106,138 'relat':227 'remain':248 'render':188 'report':120 'request':86,175 'request/response':204 'requir':73,108 'return':215 'schema':202 'scheme':100 'sentiment':127 'settl':53 'spars':179 'specif':62,246 'specul':235 'stripe':229 'stripe charges API' 'success':165 'suggest':224 'suit':5,23 'summar':130 'text':129 'token':139 'unclear':249 'unit':80 'usdc':18,36,56,82 'usdc-settlement' 'use':96 'util':12,30,145 'valid':147 'via':17,35,90 'wallet':192 'web3':134 'without':236 'x':93 'x-payment':92 'x402':2,20,51,98,162 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"dd45c38f-140e-46d4-85f9-fc9187e98271","listingId":"9a91c2fa-ff8c-4eb1-9c34-8cfaeaf45fa2","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/97","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:40.934Z"}],"sources":[{"listingId":"9a91c2fa-ff8c-4eb1-9c34-8cfaeaf45fa2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/97","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:40.934Z","lastSeenAt":"2026-04-22T21:31:26.614Z"}],"details":{"listingId":"9a91c2fa-ff8c-4eb1-9c34-8cfaeaf45fa2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/97 \\\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 challenge requiring USDC payment of 20,000 base units ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/97"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/97"}],"useCases":["Programmatic access to pay-per-call endpoints without API key management","Agent-driven API consumption with on-chain USDC micropayments","Accessing analytics, AI inference, finance data, or utility services at low per-request cost"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.852Z"},"updatedAt":"2026-04-22T21:31:26.614Z"}}