{"id":"3e58d660-2d66-4ed5-855f-b24a6ca213bb","shortId":"eJYYx9","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/93) returned a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made via the x402 \"exact\" scheme to the specified payTo address. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — 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. The specific functionality behind \"resource/93\" is not described anywhere in the crawled material, making it unclear what this particular endpoint actually does beyond the generic \"Premium API Access\" label. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/generate/resource/93 ('Premium API Access') is not described anywhere","No request or response schema is documented; input/output formats are unknown","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/93","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/93","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 spec, no documented request/response schema, no examples, and the specific functionality of 'resource/93' is entirely undescribed. Documentation pages are blank beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/generate/resource/93':109 '/docs':162 '/pricing':163 '/readme':166 '/request':13,28 '0.02':12,27,86,133 '000':120 '0x8335':125 '20':119 '2913':126 '6':129 'Base network API' 'USDC micropayment API' 'accept':151 'access':7,22,38,220 'actual':213 'address':148 'ai/ml':59 'analysi':62 'analyt':58 'anywher':201 'api':6,21,37,55,95,219 'application/json':156 'avail':192 'awar':226 'base':9,24,91,121,128 'behind':196 'beyond':215 'broad':48 'call':4,19,84 'caller':223 'catalog':49 'challeng':114 'classif':64 'commit':103 'connect':172 'contact':236 'content':178 'convers':81 'cost':85 'crawl':204 'crypto-paid API' 'data':57 'decim':130 'describ':200 'document':157,187,229 'embed':65 'endpoint':32,150,212 'equal':132 'estim':75 'exact':142 'exampl':191 'exchang':70 'experiment':234 'extrem':159 'feed':69 'financ':66 'function':195 'gas':74 'generat':82 'generic':217 'geocod':79 'host':46 'http':152 'http-post' 'infer':60 'infrastructur':77 'input/output':230 'integr':232 'json-api' 'key':96 'label':221 'limit':99 'lowpaymentfee' 'lowpaymentfee.com':34 'made':138 'make':206 'materi':205 'maxamountrequir':117 'minimum':102 'network':92 'no-api-key' 'openapi':182 'page':167 'particular':211 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,136 'payto':147 'per':3,18,53,134 'post':153 'premium':5,20,36,218 'premium API access' 'price':68 'probe':108 'prompt':174 'prospect':222 'protocol':43 'provid':35,238 'quot':73 'rate':71,98 'render':169 'request':54,135 'request/response':185 'requir':104,233 'resourc':107 'resource/93':197 'return':110,155 'schema':186,231 'scheme':143 'sentiment':61 'site':45 'span':56 'spars':160 'spec':183 'specif':106,194 'specifi':146 'summar':63 'token':72 'unclear':208 'unit':122 'usag':190 'usdc':15,30,88,124 'usdc-base' 'util':78 'valid':80,112 'via':10,25,39,139 'wallet':173 'web3':67 'without':228 'x402':11,26,41,113,141 'x402 API' 'x402-payment'","prices":[{"id":"c77e80f1-7137-4e81-95b8-a6e3aa5637e4","listingId":"3e58d660-2d66-4ed5-855f-b24a6ca213bb","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:38.131Z"}],"sources":[{"listingId":"3e58d660-2d66-4ed5-855f-b24a6ca213bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:38.131Z","lastSeenAt":"2026-04-22T19:30:52.085Z"}],"details":{"listingId":"3e58d660-2d66-4ed5-855f-b24a6ca213bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/93 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/93"},{"claim":"The site advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is on Base with 6 decimals, making 20000 base units equal to $0.02","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/93"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-request API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402-compatible endpoints for micropayment-based service consumption"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-volume or experimental usage where per-call pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call costs may add up without bulk discounts","Anyone unable to pay in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.225Z"},"updatedAt":"2026-04-22T19:30:52.085Z"}}