{"id":"d4aabbc9-2b25-4b55-a022-00afa4f6f79c","shortId":"gdHFax","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 hosts a collection of pay-per-call API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/135` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per request. No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 are listed at the same $0.02/request price point.\n\nDocumentation is extremely thin — 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 documentation, and no usage examples available from the crawl. The purpose of this specific `/api/v1/stripe/charges/135` endpoint is unclear from its path alone (it references Stripe charges), and the actual input/output behavior cannot be confirmed without making a paid request. The x402 challenge is live and well-formed, confirming the endpoint is operational.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","lowpaymentfee","Base network API","crypto-gated API","402 payment required"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a 'Connect wallet' prompt","No OpenAPI or schema definition found; request and response formats are unknown","The endpoint path '/api/v1/stripe/charges/135' references Stripe charges but its actual function is undocumented","No examples of successful responses are available from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/135","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational at $0.02 USDC per call. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of this endpoint (stripe/charges/135) is ambiguous. Effectively a stub 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'/api/v1/stripe/charges/135':65,206 '/docs':167 '/pricing':168 '/readme':171 '/request':16,34,159 '0.02':15,33,85,158 '000':80 '20':79 '402 payment required' 'Base network API' 'USDC micropayment API' 'access':71 'actual':220 'advertis':96,114 'ai':9,27,126 'alon':213 'analysi':130 'analyt':8,26,120 'api':4,22,46,70,90 'attach':99 'avail':197 'base':7,25,59,81 'base-network' 'behavior':222 'broader':112 'call':45 'caller':97 'cannot':223 'categori':116 'challeng':233 'charg':217 'classif':133 'collect':40 'confirm':225,240 'connect':177 'content':183 'convers':150 'crawl':200 'crypto-gated API' 'data':119,123 'document':162,192 'embed':134 'endpoint':13,31,47,63,118,207,242 'estim':144 'exampl':196 'exchang':139 'export':124 'extrem':164 'feed':138 'financ':10,28,135 'form':239 'four':115 'gas':143 'gate':3,21,48 'generat':151 'geocod':148 'header':104 'host':38 'http-post' 'infrastructur':146 'input/output':221 'insight':125 'key':91 'learn':128 'limit':94 'list':67,154 'live':235 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':127 'make':227 'metric':121 'network':60 'no-api-key' 'openapi':187 'oper':244 'page':172 'paid':229 'path':212 'pay':43 'pay-per-cal':42 'pay-per-call' 'pay-per-request API' 'payment':54,75,103,109 'per':44,87 'platform':113 'point':161 'premium':69 'price':137,160 'prompt':179 'proof':110 'protocol':52 'purpos':202 'quot':142 'rate':93,140 'refer':215 'render':174 'report':122 'request':88,230 'request/response':190 'requir':73 'schema':191 'sentiment':129 'settl':53 'simpli':98 'spec':188 'specif':62,205 'stripe':216 'suit':5,23 'summar':132 'text':131 'thin':165 'token':141 'unclear':209 'unit':82 'usag':195 'usd':86 'usdc':18,36,56,84 'usdc-settlement' 'util':12,30,147 'valid':107,149 'via':17,35 'wallet':178 'web3':136 'well':238 'well-form':237 'without':226 'x':102 'x-payment':101 'x402':2,20,51,108,232 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"2900b84d-030c-4c4b-be24-54bb9526fd62","listingId":"d4aabbc9-2b25-4b55-a022-00afa4f6f79c","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/135","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:53.217Z"}],"sources":[{"listingId":"d4aabbc9-2b25-4b55-a022-00afa4f6f79c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/135","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:53.217Z","lastSeenAt":"2026-04-23T05:01:31.525Z"}],"details":{"listingId":"d4aabbc9-2b25-4b55-a022-00afa4f6f79c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/135 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/135"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/135"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that can autonomously pay for API calls via crypto","Users who want no-signup, no-rate-limit API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.013Z"},"updatedAt":"2026-04-23T05:01:31.525Z"}}