{"id":"ebc01ed2-b0d5-40e5-8a38-3ee21335f510","shortId":"7qsb2D","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. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each call costs $0.02 in USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific resource probed (/api/v1/generate/resource/54) returned a valid x402 402 challenge advertising a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base, 6 decimals = $0.02). Payment is made via the x402 \"exact\" scheme to the specified payTo address. The endpoint accepts HTTP POST requests and returns application/json responses. Timeout for payment settlement is 300 seconds.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The exact functionality behind \"/api/v1/generate/resource/54\" is unclear beyond the generic label \"Premium API Access.\" Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or direct contact with the provider.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","http-post"],"categories":["infrastructure","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — input/output formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/generate/resource/54 is not documented; 'Premium API Access' is a generic label","No request or response examples could be sourced"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/54","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/generate/resource/54","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the specific functionality of resource/54 is undefined. Documentation pages are effectively empty. This is essentially a stub 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'/api/v1/generate/resource/54':109,207 '/docs':167 '/pricing':168 '/readme':171 '/request':13,28 '0.02':12,27,86,131 '000':121 '0x8335':126 '20':120 '300':160 '402':114 '6':129 'Base network API' 'USDC micropayment API' 'accept':147 'access':7,22,38,216 'addit':182 'address':144 'advertis':116 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,95,215 'application/json':153 'avail':198 'awar':221 'base':9,24,91,122,128 'behind':206 'beyond':210 'broad':48 'call':4,19,84 'caller':218 'catalog':49 'challeng':115 'classif':64 'commit':103 'connect':177 'contact':232 'content':184 'convers':81 'cost':85 'crawl':201 'crypto-paid API' 'data':57 'decim':130 'direct':231 'document':162,193,224 'embed':65 'endpoint':32,146 'estim':75 'exact':138,204 'exampl':197 'exchang':70 'experiment':229 'extrem':164 'feed':69 'financ':66 'function':205 'gas':74 'generat':82 'generic':212 'geocod':79 'host':46 'http':148 'http-post' 'infer':60 'infrastructur':77 'input/output':225 'integr':227 'json-api' 'key':96 'label':213 'limit':99 'lowpaymentfee' 'lowpaymentfee.com':34 'made':134 'materi':202 'maxamountrequir':118 'minimum':102 'network':92 'no-api-key' 'openapi':188 'page':172 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,132,157 'payto':143 'per':3,18,53 'post':149 'premium':5,20,36,214 'premium API access' 'price':68 'probe':108 'prompt':179 'prospect':217 'protocol':43 'provid':35,235 'quot':73 'rate':71,98 'render':174 'request':54,150 'request/response':191 'requir':104,228 'resourc':107 'respons':154 'return':110,152 'schema':192,226 'scheme':139 'second':161 'sentiment':61 'settlement':158 'site':45 'span':56 'spars':165 'spec':189 'specif':106 'specifi':142 'summar':63 'technic':183 'timeout':155 'token':72 'unclear':209 'unit':123 'usag':196 'usdc':15,30,88,125 'usdc-base' 'util':78 'valid':80,112 'via':10,25,39,135 'wallet':178 'web3':67 'without':223 'x402':11,26,41,113,137 'x402 API' 'x402-payment'","prices":[{"id":"19a99cb9-d35b-4d07-98bd-c624de6b5b96","listingId":"ebc01ed2-b0d5-40e5-8a38-3ee21335f510","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/generate/resource/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:02.879Z"}],"sources":[{"listingId":"ebc01ed2-b0d5-40e5-8a38-3ee21335f510","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:02.879Z","lastSeenAt":"2026-04-22T13:30:32.729Z"}],"details":{"listingId":"ebc01ed2-b0d5-40e5-8a38-3ee21335f510","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/54"},{"claim":"All listed APIs cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/54"}],"useCases":["Programmatic access to premium API resources without traditional API key management","Agent-driven workflows that need instant, keyless API access paid in USDC on Base","Integrating pay-per-use utility or generation endpoints into automated pipelines"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.051Z"},"updatedAt":"2026-04-22T13:30:32.729Z"}}