{"id":"f37466df-b75a-498c-ac88-e28464790314","shortId":"vAvcKK","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":"lowpaymentfee.com is an x402-enabled API platform that offers a broad suite of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is returned as a standard 402 response, and callers settle each request by attaching an X-PAYMENT header with a signed USDC transaction.\n\nThe specific endpoint at `/api/v1/generate/resource/42` is listed under \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation on the site is extremely thin — 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, and no usage examples available from the crawl. The landing page lists many sibling endpoints across categories (sentiment analysis, summarization, geocoding, price feeds, etc.), all at the same $0.02 price point, but provides no detail on request formats or response payloads for any of them. The actual functionality behind `/api/v1/generate/resource/42` is unclear beyond its title.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"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 OpenAPI or schema available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The purpose of /api/v1/generate/resource/42 ('Premium API Access') is not described anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The actual functionality behind 'Premium API Access' at resource/42 is undefined. Effectively a stub 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'/api/v1/generate/resource/42':114,247 '/docs':173 '/pricing':174 '/readme':177 '/request':13,28 '0.02':12,27,61,141,226 '000':129 '0x8335':135 '20':128 '2913':136 '300':154 '402':91 '6':145 'Base network API' 'USDC micropayment API' 'accept':159 'access':7,22,120 'across':213 'actual':244 'advertis':124 'ai/ml':49 'analysi':216 'analyt':48 'api':6,21,37,73,119 'application/json':164 'asset':134 'attach':99 'avail':202 'base':9,24,69,130,138 'base-network' 'behind':246 'beyond':250 'broad':42 'call':4,19 'caller':94 'categori':214 'challeng':85,123 'commit':81 'connect':183 'content':189 'crawl':205 'crypto-paid API' 'data':47,52 'decim':146 'detail':232 'document':165 'enabl':36 'endpoint':45,57,112,158,212 'equal':140 'etc':221 'exact':151 'exampl':201 'extrem':170 'feed':220 'finance/web3':51 'format':235 'function':245 'geocod':218 'given':142 'header':104 'infer':50 'infrastructur':54 'json-response' 'key':74 'land':207 'limit':77 'list':116,209 'lowpaymentfee' 'lowpaymentfee.com':31 'mani':210 'maxamountrequir':126 'network':70 'no-api-key' 'offer':40 'openapi':193 'page':178,208 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':64 'payload':238 'payment':84,103,148 'per':3,18,62 'platform':38 'point':228 'post':160 'post-method' 'premium':5,20,118 'premium API access' 'price':59,219,227 'prompt':185 'provid':230 'rate':76 'render':180 'request':63,97,161,234 'request/response':196 'respons':92,237 'return':87,163 'schema':197 'scheme':149 'second':155 'sentiment':215 'settl':95 'sibl':211 'sign':107 'site':168 'span':46 'spec':194 'specif':111 'standard':90 'suit':43 'summar':217 'thin':171 'timeout':156 'titl':252 'transact':109 'unclear':249 'unit':131 'upfront':80 'usag':200 'usdc':15,30,66,108,133,143 'usdc-settlement' 'util':55 'via':10,25 'wallet':184 'x':102 'x-payment':101 'x402':11,26,35,83,122 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1dba456a-e357-4d9d-acd5-3524cd1f2ced","listingId":"f37466df-b75a-498c-ac88-e28464790314","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:39.089Z"}],"sources":[{"listingId":"f37466df-b75a-498c-ac88-e28464790314","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:39.089Z","lastSeenAt":"2026-04-22T21:30:32.922Z"}],"details":{"listingId":"f37466df-b75a-498c-ac88-e28464790314","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/42"},{"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"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/42"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-use access to utility or generation endpoints","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers exploring x402 payment flows","Agents that need keyless, per-call API access settled in USDC","Low-volume or sporadic API consumers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.314Z"},"updatedAt":"2026-04-22T21:30:32.922Z"}}