{"id":"086d84c1-f7df-410a-80c5-3e727fa55ab3","shortId":"RAMzGe","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled on the Base network using the x402 protocol and USDC. The specific endpoint `/api/endpoint-96` is labeled \"Premium API Access\" and accepts POST requests. Payment is made per call with no API keys, no rate limits, and no upfront commitments.\n\nThe site advertises a broad catalog of 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 x402 challenge for this endpoint specifies a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base, 6 decimals), which equals $0.02.\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 schema, no request/response examples, and no description of what `/api/endpoint-96` actually returns. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is unclear what input it expects or what output it produces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api","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, /pricing, /api, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for /api/endpoint-96.","The specific function of /api/endpoint-96 is unknown; the site lists many other endpoints but this one is not among them.","Cannot verify what data or service this endpoint actually provides."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-96","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/endpoint-96","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 request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose and output of /api/endpoint-96 specifically are undocumented, making this effectively a stub 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'/api/endpoint-96':62,200 '/docs':169 '/pricing':171 '/readme':173 '/request':12,30 '0.02':11,29,136,163 '0x8335':155 '20000':149 '2913':156 '402':210 '6':159 'Base network API' 'USDC micropayment API' 'accept':69 'access':67 'actual':201 'advertis':90 'ai':104 'analysi':108 'analyt':98 'api':6,16,24,34,46,66,79 'base':8,26,51,150,158 'base-network' 'broad':92 'call':4,22,76 'catalog':93 'challeng':141,212 'classif':111 'collect':40 'commit':87 'connect':179 'contract':154 'convers':128 'crypto-paid endpoint' 'data':97,101 'decim':160 'descript':197 'detail':186 'document':164,215 'embed':112 'endpoint':47,61,95,132,144,204 'equal':162 'estim':122 'exampl':194 'exchang':117 'expect':222 'export':102 'extrem':166 'feed':116 'financ':113 'gas':121 'generat':129 'geocod':126 'host':38 'infrastructur':124 'input':220 'insight':103 'key':17,35,80 'label':64 'learn':106 'limit':83 'list':131 'live':206 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':105 'made':74 'maxamountrequir':147 'metric':99 'network':52 'no-api-key' 'openapi':190 'output':225 'page':174 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':72 'per':3,21,44,75,137 'post':70 'post-endpoint' 'premium':5,23,65 'premium API access' 'price':115,134 'produc':227 'prompt':181 'proper':209 'protocol':56 'quot':120 'rate':82,118 'render':176 'report':100 'request':45,71,138 'request/response':193 'requir':18,36 'return':202,207 'schema':191 'sentiment':107 'settl':48 'site':89 'span':96 'spars':167 'specif':60 'specifi':145 'summar':110 'technic':185 'text':109 'token':119 'unclear':218 'unit':151 'upfront':86 'usdc':14,32,58,153 'usdc-settlement' 'use':53 'util':125 'valid':127 'via':9,27 'wallet':180 'web3':114 'without':214 'x402':10,28,55,140,211 'x402 API' 'x402-payment'","prices":[{"id":"2c81be72-3687-465c-a0c8-700e89ec539a","listingId":"086d84c1-f7df-410a-80c5-3e727fa55ab3","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/endpoint-96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:30.618Z"}],"sources":[{"listingId":"086d84c1-f7df-410a-80c5-3e727fa55ab3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:30.618Z","lastSeenAt":"2026-04-22T23:01:01.773Z"}],"details":{"listingId":"086d84c1-f7df-410a-80c5-3e727fa55ab3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-96 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/endpoint-96"},{"claim":"All listed endpoints 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-96"},{"claim":"The site advertises endpoints for data & analytics, AI & ML, finance & Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Production workloads requiring guaranteed SLAs or support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.723Z"},"updatedAt":"2026-04-22T23:01:01.773Z"}}