{"id":"7b947f38-c05e-4264-94c3-b97ad83ffcc3","shortId":"6ZyZkZ","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The endpoint accepts POST requests and charges up to $0.02 per call in USDC (USD Coin), settled on-chain to a specified wallet address. Payment is handled via the x402 protocol: callers receive a 402 challenge with payment details and must include an X-PAYMENT header to proceed.\n\nThe broader lowpaymentfee.com platform advertises a suite of API categories including 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. However, this specific listing is for the `/api/v1/stripe/charges/68` endpoint, whose exact functionality is not documented beyond the label \"Premium API Access.\"\n\nDocumentation on the site is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint is confirmed live (returns a valid x402 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","per-call-billing","post-endpoint"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a 'Connect wallet' prompt","No OpenAPI or request/response schema provided; the actual behavior of this endpoint upon successful payment is unknown","The endpoint path '/api/v1/stripe/charges/68' suggests a Stripe-related charge resource, but no details are documented","The description 'Premium API Access' is generic and does not clarify what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' is entirely opaque. The site's docs pages are empty beyond a wallet-connect 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'/api/v1/stripe/charges/68':165 '/docs':187 '/pricing':189 '/readme':191 '0.02':54,144 '402':80,227 'Base network API' 'USDC API access' 'accept':47 'access':6,20,36,178 'actual':232 'address':69 'advertis':99 'ai':113 'analysi':117 'analyt':107 'api':5,19,35,103,149,177 'avail':217 'base':8,22,43 'base-network' 'behind':37 'beyond':173 'broader':96 'call':12,26,56 'caller':77 'categori':104 'chain':64 'challeng':81,228 'charg':51 'classif':120 'coin':60 'commit':157 'confirm':221 'connect':197 'convers':137 'crypto-paid endpoint' 'data':106,110 'detail':84,204 'document':172,179 'embed':121 'endpoint':30,46,140,166,219 'estim':131 'exact':168 'exampl':216 'exchang':126 'export':111 'extrem':184 'feed':125 'financ':122 'function':169 'gas':130 'gate':3,17 'generat':138 'geocod':135 'handl':72 'header':92 'howev':158 'includ':87,105 'infrastructur':133 'insight':112 'key':150 'label':175 'learn':115 'limit':153 'list':142,161 'live':222 'lowpaymentfee' 'lowpaymentfee.com':32,97 'machin':114 'metric':108 'micropayment API' 'minimum':156 'must':86 'network':44 'on-chain':62 'openapi':208 'page':192 'paid':9,23 'pay-per-call API' 'payment':70,83,91,236 'paywal':40 'per':11,25,55,145 'per-cal':10,24 'per-call-billing' 'platform':98 'post':48 'post-endpoint' 'premium':4,18,34,176 'price':124 'proceed':94 'prompt':199 'protocol':76 'provid':33 'quot':129 'rate':127,152 'receiv':78 'render':194 'report':109 'request':49,146 'request/response':211 'return':223,233 'schema':212 'sentiment':116 'settl':61 'site':182 'spars':185 'spec':209 'specif':160 'specifi':67 'success':235 'suit':101 'summar':119 'technic':203 'text':118 'token':128 'unknown':238 'upon':234 'usag':215 'usd':59 'usdc':14,28,58 'usdc-payment' 'util':134 'valid':136,225 'via':73 'wallet':68,198 'web3':123 'whose':167 'x':90 'x-payment':89 'x402':2,16,39,75,226 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3637a02b-702a-454a-b1b0-b17dcda6ed7a","listingId":"7b947f38-c05e-4264-94c3-b97ad83ffcc3","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:30.677Z"}],"sources":[{"listingId":"7b947f38-c05e-4264-94c3-b97ad83ffcc3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:30.677Z","lastSeenAt":"2026-04-22T23:01:56.418Z"}],"details":{"listingId":"7b947f38-c05e-4264-94c3-b97ad83ffcc3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/68 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/68"},{"claim":"All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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":["Paying per-call for premium API access without API keys or subscriptions","Integrating x402 payment flows into agent-driven workflows","Accessing gated services on the Base L2 network using USDC"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-use API access on Base","Low-volume callers who prefer no subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume production workloads requiring SLAs and guaranteed uptime","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.25Z"},"updatedAt":"2026-04-22T23:01:56.418Z"}}