{"id":"efa17832-5576-48c4-8560-4cee946946f6","shortId":"Np5bAZ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/payments/131` accepts POST requests and charges 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per call (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a catalog of pay-per-call endpoints spanning 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 listed endpoints are priced at $0.02 per request. The platform advertises no API keys, no rate limits, and instant access.\n\nHowever, the specific functionality behind the `/api/v1/payments/131` endpoint is unclear. The x402 challenge describes it only as \"Premium API Access\" with a JSON MIME type response, but provides no input/output schema details beyond the HTTP POST method. Documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content. Without further documentation or example responses, the exact data or service returned by this particular endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-call","no-api-key","json-response","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["The exact functionality behind /api/v1/payments/131 is not documented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, README) returned no substantive content.","No input or output schema is provided beyond 'application/json' MIME type.","The endpoint path '/api/v1/payments/131' does not match any of the catalog endpoints listed on the homepage, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/131","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/payments/131","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 ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response, and the specific functionality of /api/v1/payments/131 is undocumented. The docs, pricing, and README pages are effectively empty (wallet-connect 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'0.02':12,28,70,147 '000':57 '0x8335':62 '20':56 '2913':63 '402 payment API' '6':75 'Base network API' 'USDC micropayment endpoint' 'accept':51 'access':7,23,40,161,181 'account':92 'advertis':98,152 'ai':115 'analysi':119 'analyt':109 'api':6,22,39,89,154,180 'base':9,25,58,66 'behind':166 'beyond':194 'broader':95 'call':4,20,72,105 'cannot':231 'catalog':100 'challeng':174 'charg':55 'classif':122 'confirm':233 'connect':209 'content':214 'convers':139 'crypto-paid API' 'data':108,112,223 'decim':76 'describ':175 'detail':193 'doc':201 'document':199,217 'embed':123 'endpoint':34,106,143,169,230 'equal':69 'estim':133 'exact':222 'exampl':219 'exchang':128 'export':113 'feed':127 'financ':124 'function':165 'gas':132 'generat':140 'geocod':137 'handl':79 'header':86 'howev':162 'http':196 'http-post' 'infrastructur':135 'inlin':80 'input/output':191 'insight':114 'instant':160 'json':184 'json-response' 'key':90,155 'learn':117 'limit':158 'list':142 'lowpaymentfee' 'lowpaymentfee.com':36,96 'machin':116 'method':198 'metric':110 'mime':185 'network':67 'no-api-key' 'page':200 'particular':229 'pay':2,18,103 'pay-per-cal':1,17,102 'pay-per-call' 'pay-per-request API' 'payment':44,77,85 'per':3,13,19,29,71,104,148 'platform':97,151 'post':52,197 'premium':5,21,38,179 'price':126,145,202 'prompt':210 'protocol':45 'provid':37,189 'quot':131 'rate':129,157 'readm':203 'report':111 'request':14,30,53,149 'requir':93 'resourc':48 'respons':187,220 'return':204,226 'schema':192 'sentiment':118 'servic':225 'span':107 'specif':47,164 'substant':213 'summar':121 'text':120 'token':130 'type':186 'unclear':171 'unit':59 'usdc':16,32,61,73 'usdc-base-network' 'use':74 'util':136 'valid':138 'via':10,26,41,81 'wallet':208 'wallet-connect':207 'web3':125 'without':215 'x':84 'x-payment':83 'x402':11,27,43,173 'x402 API' 'x402-payment'","prices":[{"id":"e53a6789-d3cb-4781-a0d8-e81ef0385422","listingId":"efa17832-5576-48c4-8560-4cee946946f6","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/payments/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:25.740Z"}],"sources":[{"listingId":"efa17832-5576-48c4-8560-4cee946946f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:25.740Z","lastSeenAt":"2026-04-23T19:01:17.325Z"}],"details":{"listingId":"efa17832-5576-48c4-8560-4cee946946f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/131 \\\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 charges 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/payments/131"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or accounts","Agent-driven workflows that pay per call using USDC on Base","Integrating pay-as-you-go API calls into Web3 applications"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring free or trial-tier access to evaluate the service"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.904Z"},"updatedAt":"2026-04-23T19:01:17.325Z"}}