{"id":"9200c823-6155-4ba0-9424-904ed6ffeada","shortId":"un3ht3","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 specific endpoint `/api/v1/stripe/charges/53` accepts POST requests and charges up to 0.02 USDC per call (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a Base address using USDC (contract 0x8335…2913).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning data & analytics (metrics, reports, data export, insights), AI & ML (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.\n\nHowever, the specific functionality behind `/api/v1/stripe/charges/53` is not documented beyond the label \"Premium API Access.\" The crawled docs, pricing, and README pages returned only a wallet-connect prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what data or service this particular endpoint returns. The endpoint is confirmed live (402 challenge captured), but its actual behavior after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-call-pricing","post-endpoint","no-api-key"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available for this specific endpoint beyond the label 'Premium API Access'","No OpenAPI or request/response schema provided","Docs, pricing, README, and API pages all returned only a wallet-connect prompt with no content","The actual functionality delivered after payment is unknown","Endpoint path includes 'stripe/charges' which is ambiguous — unclear if this proxies Stripe or is unrelated"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/53","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns after payment, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage were empty wallet-connect stubs. The specific purpose of '/api/v1/stripe/charges/53' is entirely 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'0.02':56,135 '000':61 '0x8335':82 '20':60 '2913':83 '402':207 '6':67 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':6,20,36,163 'actual':212 'addit':180 'address':78 'advertis':88 'ai':105 'analysi':108 'analyt':99 'api':5,19,35,96,140,162 'base':8,22,43,62,77 'behavior':213 'behind':37,153 'beyond':158 'broader':85 'call':12,26,59 'captur':209 'chain':74 'challeng':208 'charg':53 'classif':111 'commit':148 'confirm':205 'connect':176 'content':181 'contract':81 'convers':128 'crawl':165 'crypto-paid API' 'data':98,102,195 'decim':68 'descript':192 'doc':166 'document':157 'embed':112 'endpoint':30,47,131,200,203 'estim':122 'exampl':189 'exchang':117 'export':103 'feed':116 'financ':113 'function':152 'gas':121 'gate':3,17 'generat':129 'geocod':126 'howev':149 'infrastructur':124 'insight':104 'key':141 'label':160 'limit':144 'list':133 'live':206 'lowpaymentfee' 'lowpaymentfee.com':32,86 'metric':100 'minimum':147 'ml':106 'network':44 'no-api-key' 'on-chain':72 'openapi':185 'page':170 'paid':9,23 'particular':199 'pay':93 'pay-per-call API' 'pay-per-request':92 'payment':69,215 'paywal':40 'per':11,25,58,94,136 'per-cal':10,24 'per-call-pricing' 'platform':87 'post':50 'post-endpoint' 'premium':4,18,34,161 'premium API access' 'price':115,167 'prompt':177 'provid':33 'quot':120 'rate':118,143 'readm':169 'report':101 'request':51,95,137 'request/response':188 'return':171,201 'schema':186 'sentiment':107 'servic':197 'settl':71 'span':97 'specif':46,151 'suit':90 'summar':110 'text':109 'token':119 'unit':63 'unknown':217 'usdc':14,28,57,65,80 'usdc-base' 'use':79 'util':125 'valid':127 'wallet':175 'wallet-connect':174 'web3':114 'x402':2,16,39 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"8ccef3e0-6fa7-497a-90bb-a2a734129d1a","listingId":"9200c823-6155-4ba0-9424-904ed6ffeada","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/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:27.632Z"}],"sources":[{"listingId":"9200c823-6155-4ba0-9424-904ed6ffeada","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:27.632Z","lastSeenAt":"2026-04-22T23:01:56.265Z"}],"details":{"listingId":"9200c823-6155-4ba0-9424-904ed6ffeada","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/53 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header after settling 0.02 USDC on Base","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"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/53","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/53"},{"claim":"All endpoints on the platform are listed 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"}],"useCases":["Paying per-request for API access without traditional API keys or subscriptions","Integrating x402-compatible agents that settle payments on Base in USDC","Accessing premium data or services with on-chain micropayments"],"bestFor":["Developers building x402-compatible agent workflows","Users who want pay-as-you-go API access without signup","On-chain payment integration testing on Base"],"notFor":["Users who need detailed API documentation or schemas before purchasing","High-volume use cases where per-call crypto settlement overhead matters","Anyone needing to understand exact response format before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.463Z"},"updatedAt":"2026-04-22T23:01:56.265Z"}}