{"id":"2e020a52-3964-433d-a345-e2b93aa847b2","shortId":"kvdpax","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. It accepts POST requests and charges 0.02 USDC per call (20000 base units with 6 decimals) settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. No API keys or rate limits are required — payment is handled inline via the X-PAYMENT header.\n\nThe provider's landing page advertises a broad suite of endpoints across categories including 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02/request. However, the specific endpoint `/api/v1/transactions/95` is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response, and no description of the response schema for this particular endpoint. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually delivers upon payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, /README all show only 'Connect wallet'","No OpenAPI or schema describing what this endpoint returns upon successful payment","The specific path '/api/v1/transactions/95' is not listed on the provider's landing page among advertised endpoints","Response format and content are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/95","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/transactions/95","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 x402 402 challenge, but there is zero documentation on what the endpoint actually returns. No OpenAPI spec, no example responses, no description of the 'transactions/95' resource. The landing page lists many endpoints but provides no technical detail beyond 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'/api/v1/transactions/95':146 '/docs':170 '/pricing':172 '/readme':174 '/request':13,28,141 '0.02':12,27,54,140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':68 '20000':58 '402':215 '6':62 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,153 'across':100 'actual':220 'addit':185 'advertis':94 'ai':110 'analysi':114 'analyt':104 'api':6,21,37,72,152 'base':9,24,46,59,70 'base-network' 'broad':96 'call':4,19,57 'categori':101 'challeng':216 'charg':53 'classif':117 'confirm':210 'connect':180 'contract':67 'convers':133 'crypto-paid endpoint' 'data':103,107,160 'decim':63 'deliv':221 'describ':148 'descript':198 'detail':187 'document':157,165 'embed':118 'endpoint':32,99,136,145,206,208 'estim':128 'exampl':194 'exchang':123 'export':108 'extrem':167 'feed':122 'financ':119 'function':162 'gas':127 'generat':134 'geocod':131 'handl':81 'header':88 'howev':142 'includ':102 'infrastructur':130 'inlin':82 'insight':109 'key':73 'land':92 'learn':112 'limit':76 'list':138 'live':211 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':111 'metric':105 'network':47 'no-api-key' 'openapi':191 'page':93,175 'particular':205 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,79,87,223 'per':3,18,56 'post':50 'post-method' 'premium':5,20,36,151 'premium API access' 'price':121 'prompt':182 'protocol':43 'provid':35,90 'quot':126 'rate':75,124 'render':177 'report':106 'request':51 'request/response':195 'requir':78 'respons':201 'return':164,212 'schema':202 'sentiment':113 'settl':64 'spars':168 'spec':192 'specif':144 'suit':97 'summar':116 'technic':186 'text':115 'token':125 'unit':60 'unknown':225 'upon':222 'usdc':15,30,55,66 'usdc-settlement' 'valid':132,214 'via':10,25,39,83 'wallet':181 'web3':120 'x':86 'x-payment':85 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"d449d7e7-55c2-4752-b739-004d4f922e99","listingId":"2e020a52-3964-433d-a345-e2b93aa847b2","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/transactions/95","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:18.541Z"}],"sources":[{"listingId":"2e020a52-3964-433d-a345-e2b93aa847b2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/95","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:18.541Z","lastSeenAt":"2026-04-22T17:02:19.525Z"}],"details":{"listingId":"2e020a52-3964-433d-a345-e2b93aa847b2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/95 \\\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":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/95"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/95"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Integrating pay-as-you-go API calls without managing API keys or subscriptions","Agent-driven workflows that need instant, keyless API access on Base"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Anyone without USDC on Base network","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.407Z"},"updatedAt":"2026-04-22T17:02:19.525Z"}}