{"id":"87b122b5-348f-4989-9634-286084168154","shortId":"bEF3FU","kind":"x402","title":"Pay-per-request premium API access via x402 on Base network, settled in USDC at $0.02/call.","tagline":"Pay-per-request premium API access via x402 on Base network, settled in USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities—all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/charges/49` accepts POST requests and is gated by an x402 payment challenge requiring up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on the Base network, which equals $0.02. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe exact functionality behind this particular endpoint path (`/stripe/charges/49`) is not documented beyond the generic \"Premium API Access\" label. The site's documentation pages only show a \"Connect wallet\" prompt with no further technical details. Without additional documentation or response examples, the precise data returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated endpoint","402 payment required"],"warnings":["No documentation available for this specific endpoint's functionality or response format","The path '/api/v1/stripe/charges/49' suggests a Stripe-related charge endpoint but its purpose is unclear","All documentation pages beyond the landing page return only 'Connect wallet' with no technical content","No OpenAPI spec, no response schema, no example responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/49","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/49","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of request/response schemas, no examples, and the specific functionality of this endpoint path is undocumented. The docs/pricing/README pages all just show 'Connect wallet' with no useful 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'/call':18,36 '/stripe/charges/49':143 '0.02':17,35,73,118 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':129 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':111 '20':105 '300':132 '402 payment required' 'Base network API' 'USDC micropayment API' 'accept':91 'access':7,25,44,152 'addit':171 'address':128 'ai/ml':63 'analyt':62 'api':6,24,43,59,78,151 'base':11,29,107,114 'base-network' 'behind':45,138 'beyond':147 'challeng':101 'collect':53 'commit':85 'connect':162 'crypto-gated endpoint' 'data':61,66,178 'detail':169 'document':146,157,172 'endpoint':38,89,141,182 'equal':117 'exact':125,136 'exampl':175 'finance/web3':65 'function':137 'gate':96 'generic':149 'host':51 'infer':64 'infrastructur':68 'key':79 'label':153 'limit':82 'lowpaymentfee' 'lowpaymentfee.com':40 'made':121 'network':12,30,115 'no-api-key' 'page':158 'particular':140 'path':142 'pay':2,20,56 'pay-per-call API' 'pay-per-request':1,19,55 'payment':100,119 'paywal':48 'per':3,21,57,74 'post':92 'post-method' 'precis':177 'premium':5,23,42,150 'price':71 'prompt':164 'provid':41 'rate':81 'remain':183 'request':4,22,58,75,93 'requir':86,102 'respons':174 'return':179 'scheme':126 'second':133 'settl':13,31 'show':160 'site':50,155 'span':60 'specif':88 'technic':168 'timeout':134 'unclear':184 'unit':108 'usdc':15,33,110 'usdc-settlement' 'util':69 'via':8,26,122 'wallet':163 'without':170 'x402':9,27,47,99,124 'x402 API' 'x402-payment'","prices":[{"id":"5f457fdf-df33-487d-8509-908da6e31def","listingId":"87b122b5-348f-4989-9634-286084168154","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:25.246Z"}],"sources":[{"listingId":"87b122b5-348f-4989-9634-286084168154","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:25.246Z","lastSeenAt":"2026-04-23T00:32:07.711Z"}],"details":{"listingId":"87b122b5-348f-4989-9634-286084168154","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/49 \\\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 up to 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/49"},{"claim":"All APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/49"}],"useCases":["Programmatic access to premium API services without traditional API key management","Agent-driven workflows that need instant, keyless API access settled in crypto","Demonstrating x402 payment protocol integration for pay-per-request services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base network","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or response schemas before integrating","High-volume use cases where per-request crypto settlement overhead is impractical","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.611Z"},"updatedAt":"2026-04-23T00:32:07.711Z"}}