{"id":"d75e7c6e-841a-4766-a78c-92b6854cadc7","shortId":"usTY3Q","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 is a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/198` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per request. Payment is made via the x402 exact scheme by including an X-PAYMENT header.\n\nThe broader platform offers endpoints across four categories: 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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation 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 documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a valid 402 challenge), but the actual behavior and response format of this specific charges endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","exact-scheme"],"categories":["finance","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","stripe charges API","micropayment API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/stripe/charges/198 ('Premium API Access') is not explained anywhere","No examples of successful responses are available from crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/198","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual purpose of the 'stripe/charges/198' resource is entirely opaque. This is effectively a stub 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'/api/v1/stripe/charges/198':62 '/docs':178 '/pricing':180 '/readme':182 '/request':16,34 '0.02':15,33,94,159 '000':81 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':87 '20':80 '402':222 '6':90 'Base network API' 'USDC pay-per-call' 'accept':70 'access':68 'across':117 'actual':226 'advertis':76 'ai':9,27,127 'analysi':131 'analyt':8,26,121 'api':4,22,49,67,164 'asset':86 'avail':209 'base':7,25,56,82 'base-network' 'behavior':227 'broader':113 'call':48 'categori':119 'challeng':75,223 'charg':234 'classif':134 'collect':40 'commit':172 'confirm':217 'connect':188 'convers':151 'crawl':212 'data':120,124 'decim':91 'detail':195 'document':173,204 'embed':135 'endpoint':13,31,50,60,116,154,215,235 'equat':92 'estim':145 'exact':103 'exact-scheme' 'exampl':208 'exchang':140 'export':125 'extrem':175 'feed':139 'financ':10,28,136 'format':230 'four':118 'gas':144 'gate':3,21 'generat':152 'geocod':149 'header':111 'includ':106 'infrastructur':147 'insight':126 'key':165 'learn':129 'limit':168 'list':64 'live':218 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':128 'made':99 'materi':213 'maxamountrequir':78 'metric':122 'micropayment API' 'minimum':171 'network':57 'no-api-key' 'offer':115 'openapi':199 'page':183 'pay':46 'pay-per-cal':45 'pay-per-request' 'payment':97,110 'per':47,95,160 'platform':114 'post':71 'post-method' 'premium':66 'price':138,157 'prompt':190 'protocol':44 'quot':143 'rate':141,167 'remain':236 'render':185 'report':123 'request':72,96,161 'request/response':202 'respons':229 'return':219 'schema':203 'scheme':104 'sentiment':130 'settl':51 'spars':176 'spec':200 'specif':59,233 'stripe charges API' 'suit':5,23 'summar':133 'technic':194 'text':132 'token':142 'uniform':156 'unit':83 'unknown':237 'usag':207 'usdc':18,36,53,85 'usdc-settlement' 'util':12,30,148 'valid':150,221 'via':17,35,100 'wallet':189 'web3':137 'x':109 'x-payment':108 'x402':2,20,43,74,102 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':42","prices":[{"id":"df9f4c99-e80a-4fa0-a360-ab68ceea63dd","listingId":"d75e7c6e-841a-4766-a78c-92b6854cadc7","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:19.237Z"}],"sources":[{"listingId":"d75e7c6e-841a-4766-a78c-92b6854cadc7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:19.237Z","lastSeenAt":"2026-04-23T03:31:43.646Z"}],"details":{"listingId":"d75e7c6e-841a-4766-a78c-92b6854cadc7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/198\n# Returns 402 with x402 challenge; include X-PAYMENT header with signed USDC payment on Base to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/198"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USD Coin, version 2)","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/198"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a Stripe charges resource via crypto micropayment","Agent-driven API consumption without traditional API key provisioning","Pay-per-call access to analytics, AI, finance, or utility endpoints on Base"],"bestFor":["Developers wanting keyless, pay-per-request API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone requiring fiat-only payment rails with no crypto involvement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.877Z"},"updatedAt":"2026-04-23T03:31:43.646Z"}}