{"id":"129008c4-563b-4463-a474-0b444ec0d551","shortId":"TU9XyA","kind":"x402","title":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.","tagline":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/charges/71` is listed under the \"Premium API Access\" label. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples. The actual functionality behind the `/api/v1/stripe/charges/71` path is unclear — the name suggests it may relate to Stripe charge data or a proxy, but this is unconfirmed. Prospective callers should be aware that without documentation, the request format and response structure must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The actual functionality of /api/v1/stripe/charges/71 is unclear; the path name suggests Stripe charge data but this is unconfirmed","No examples or usage guides found anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/71","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the actual functionality of this specific endpoint (/api/v1/stripe/charges/71) is unclear. The listing is effectively a 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'/api/v1/stripe/charges/71':100,198 '/docs':164 '/pricing':165 '/readme':168 '0.02':13,28,87,127 '000':117 '0x8335':122 '20':116 '6':131 'Base network API' 'USDC API' 'accept':153 'access':38,107 'actual':194 'advertis':112 'ai/ml':58 'analysi':61 'analyt':57 'api':5,20,37,54,106,142 'application/json':158 'awar':223 'base':8,23,95,118,124 'base-network' 'behind':39,196 'broad':47 'call':53 'caller':220 'catalog':48 'challeng':111 'charg':210 'classif':63 'connect':174 'content':180 'convers':80 'crypto-paid endpoint' 'data':56,211 'decim':132 'discov':235 'document':159,226 'embed':64 'endpoint':6,21,32,83,99,152 'equal':126 'estim':74 'exact':139 'exampl':192 'exchang':69 'experiment':236 'extrem':161 'feed':68 'financ':65 'format':229 'function':195 'gas':73 'gate':3,18 'generat':81 'geocod':78 'given':128 'host':45 'infer':59 'infrastructur':76 'json-response' 'key':143 'label':108 'limit':146 'list':102 'lowpaymentfee' 'lowpaymentfee.com':34 'made':135 'maxamountrequir':114 'may':206 'micropayment API' 'must':233 'name':203 'network':96 'no-api-key' 'openapi':184 'page':169 'path':199 'pay':51 'pay-per-cal':50 'pay-per-call API' 'pay-per-request' 'payabl':9,24 'payment':133 'paywal':42 'per':14,29,52,88 'post':154 'post-method' 'premium':4,19,36,105 'premium API access' 'price':67,85 'prompt':176 'prospect':219 'provid':35 'proxi':214 'quot':72 'rate':70,145 'relat':207 'render':171 'request':15,30,89,155,228 'request/response':187 'requir':150 'respons':231 'return':157 'schema':188 'scheme':140 'sentiment':60 'settl':90 'site':44 'span':55 'spars':162 'spec':185 'specif':98 'stripe':209 'structur':232 'subscript':149 'suggest':204 'summar':62 'token':71 'unclear':201 'unconfirm':218 'unit':119 'usag':191 'usdc':11,26,92,121,129 'usdc-settlement' 'util':77 'valid':79 'via':136 'wallet':175 'web3':66 'without':225 'x402':2,17,41,110,138 'x402 API' 'x402-gated':1,16 'x402-payment'","prices":[{"id":"f76ac8d3-0f5e-43e4-8424-e13a25526093","listingId":"129008c4-563b-4463-a474-0b444ec0d551","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/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:28.849Z"}],"sources":[{"listingId":"129008c4-563b-4463-a474-0b444ec0d551","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:28.849Z","lastSeenAt":"2026-04-22T07:31:35.607Z"}],"details":{"listingId":"129008c4-563b-4463-a474-0b444ec0d551","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/71 \\\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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/71"},{"claim":"All endpoints on the site 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 site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/71"}],"useCases":["Programmatic access to a premium API endpoint without requiring API keys or subscriptions","Agent-driven workflows that need to pay per call using USDC on Base","Exploring x402 protocol-based pay-per-request patterns"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before calling","Applications requiring high-throughput batch processing with predictable costs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.377Z"},"updatedAt":"2026-04-22T07:31:35.607Z"}}