{"id":"fe07694d-3d5d-4185-95bb-24d4e8840cf7","shortId":"eU9Lxq","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. It is one of many endpoints offered by the provider, which spans categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/benefits/42` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and returns application/json responses. The provider advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\n\nThe broader platform offers endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. Documentation pages exist but appear to require wallet connection to view, so detailed schemas and response formats are unavailable from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["general","infrastructure"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["Exact functionality of /api/v1/benefits/42 is undocumented — 'Premium API Access' is the only description available","Documentation pages require wallet connection and could not be crawled","No OpenAPI spec, no request/response schema available","Provider appears to be a demonstration or showcase site; reliability and uptime are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/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/benefits/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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what /api/v1/benefits/42 actually returns, no request/response schema, and docs pages require wallet connection. The listing is effectively a stub with confirmed 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'/request':13,28 '0.02':12,27,73,122 '000':116 '20':115 '6':124 'Base network API' 'USDC API' 'accept':108 'access':7,22,38,92,141 'advertis':132 'ai':60 'analysi':160 'analyt':59 'api':6,21,37,91,134 'appear':182 'application/json':128 'authent':146 'base':9,24,81,117 'beyond':100 'broader':149 'call':4,19 'categori':56 'challeng':105 'charg':111 'classif':163 'confirm':106 'connect':186 'convers':175 'crawl':199 'data':58,156 'decim':125 'detail':190 'document':99,178 'embed':164 'endpoint':32,49,69,85,152 'estim':172 'exact':95 'exchang':167 'exist':180 'export':157 'feed':166 'financ':63 'format':194 'function':96 'gas':171 'generat':177 'geocod':173 'given':123 'i.e':121 'includ':57 'infrastructur':66 'insight':158 'instant':140 'json-response' 'key':135 'label':102 'learn':62 'limit':138 'list':88 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'maximum':113 'mechan':147 'metric':154 'micropayment API' 'network':82 'no-api-key' 'offer':50,151 'one':46 'page':179 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,142 'per':3,18,74 'platform':150 'post':109 'post-method' 'premium':5,20,36,90 'premium API' 'price':71,165 'protocol':43 'provid':35,53,131 'quot':170 'rate':137,168 'report':155 'request':75,110 'requir':184 'respons':129,193 'return':127 'schema':191 'sentiment':159 'settl':76 'span':55 'specif':84 'summar':162 'text':161 'token':169 'unavail':196 'unit':118 'usdc':15,30,78,120 'usdc-base-network' 'util':67 'valid':174 'via':10,25,39 'view':188 'wallet':185 'web3':64 'x402':11,26,41,104 'x402 endpoint' 'x402-payment'","prices":[{"id":"9fb710d1-437d-4e88-a804-b64affdec1ad","listingId":"fe07694d-3d5d-4185-95bb-24d4e8840cf7","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/benefits/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":"2026-04-18T19:59:32.848Z"}],"sources":[{"listingId":"fe07694d-3d5d-4185-95bb-24d4e8840cf7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:32.848Z","lastSeenAt":"2026-04-22T05:31:53.765Z"}],"details":{"listingId":"fe07694d-3d5d-4185-95bb-24d4e8840cf7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/42 \\\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":"Endpoint returns 402 with x402 challenge advertising 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/benefits/42"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/42"}],"useCases":["Accessing premium data or services without subscription or API key management","Agent-driven workflows that need on-demand API calls settled in crypto","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents needing keyless, pay-per-use API access","Users who want to avoid monthly subscriptions for occasional API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.575Z"},"updatedAt":"2026-04-22T05:31:53.765Z"}}