{"id":"426448bf-4da7-4ba4-9b57-06e2220b79f7","shortId":"tqEZSE","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com is part of a suite of x402-protocol APIs that accept per-request micropayments in USDC on the Base network. The specific resource `/api/v1/benefits/74` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. Payment is handled via the x402 exact scheme — no API keys, no subscriptions, just a cryptographic payment header attached to each POST request.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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 endpoints are listed at $0.02 per request. However, the specific functionality behind `/api/v1/benefits/74` is not documented beyond the generic \"Premium API Access\" label — there is no OpenAPI schema, no request/response examples, and the docs, pricing, and README pages all resolve to a minimal \"Connect wallet\" prompt with no further detail.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) with USDC on Base (contract 0x8335…2913). The payment recipient is 0x1A2B…85F3 with a 300-second timeout. Because the actual input parameters and response format for this specific endpoint are undocumented, agents should treat this as an exploratory integration until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No documentation exists for the specific endpoint /api/v1/benefits/74 — its actual functionality is unknown.","No OpenAPI or input/output schema is provided; request body and response format must be discovered experimentally.","All docs, pricing, and README pages on the site resolve to a minimal 'Connect wallet' page with no content.","The label 'Premium API Access' is generic and does not describe a concrete capability."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/74","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/74","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, but there is no OpenAPI schema, no documented request/response format, and no explanation of what 'Premium API Access' at /api/v1/benefits/74 actually returns. Docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,24,75,148 '000':69 '0x1a2b':219 '0x8335':213 '20':68 '2913':214 '300':223 '402':207 '85f3':220 'Base network API' 'USDC API access' 'accept':44 'access':6,20,63,165 'across':107 'actual':228 'advertis':105 'agent':240 'ai':117 'analysi':121 'analyt':111 'api':5,19,42,62,87,164 'attach':96 'base':8,22,53,70,211 'base-network' 'behind':155 'beyond':160 'broader':102 'call':77 'categori':109 'challeng':205 'charg':65 'classif':124 'connect':187 'contract':212 'convers':141 'cryptograph':93 'data':110,114 'detail':193 'doc':177 'document':159,250 'embed':125 'endpoint':30,106,144,195,237 'estim':135 'exact':84 'exampl':174 'exchang':130 'exploratori':246 'export':115 'feed':129 'financ':126 'form':203 'format':233 'four':108 'function':154 'gas':134 'gate':3,17 'generat':142 'generic':162 'geocod':139 'handl':80 'header':95 'howev':151 'http':206 'i.e':74 'infrastructur':137 'input':229 'insight':116 'integr':247 'key':88 'label':60,166 'learn':119 'list':146 'live':197 'lowpaymentfee' 'lowpaymentfee.com':32,103 'machin':118 'metric':112 'micropay':48 'micropayment API' 'minim':186 'network':54 'no-api-key' 'openapi':170 'page':181 'paramet':230 'part':34 'pay':9,23 'pay-per-call API' 'payment':78,94,216 'per':11,25,46,76,149 'per-request':45 'per-request-billing' 'platform':104 'post':99 'post-endpoint' 'premium':4,18,61,163 'price':128,178 'prompt':189 'protocol':41 'quot':133 'rate':131 'readm':180 'recipi':217 'report':113 'request':12,26,47,100,150 'request/response':173 'resolv':183 'resourc':57 'respons':232 'return':199 'schema':171 'scheme':85 'second':224 'sentiment':120 'specif':56,153,236 'subscript':90 'suit':37 'summar':123 'surfac':251 'text':122 'timeout':225 'token':132 'treat':242 'undocu':239 'unit':71 'usdc':14,28,50,73,209 'usdc-micropayment' 'util':138 'valid':140 'via':81 'wallet':188 'web3':127 'well':202 'well-form':201 'x402':2,16,40,83,204 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol':39","prices":[{"id":"d18209b9-3973-4dc4-89bd-760a79d7ed52","listingId":"426448bf-4da7-4ba4-9b57-06e2220b79f7","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:51.140Z"}],"sources":[{"listingId":"426448bf-4da7-4ba4-9b57-06e2220b79f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:51.140Z","lastSeenAt":"2026-04-22T01:01:58.998Z"}],"details":{"listingId":"426448bf-4da7-4ba4-9b57-06e2220b79f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/74 \\\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 402 challenge with x402Version 1, exact scheme, USDC on Base, maxAmountRequired 20000 (=$0.02).","source_url":"https://lowpaymentfee.com/api/v1/benefits/74"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $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/v1/benefits/74"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments","Accessing premium data or services without API key registration","Programmatic pay-as-you-go access to utility endpoints"],"bestFor":["Developers or agents who want keyless, pay-per-request API access","Crypto-native workflows settling on Base L2","Low-volume or exploratory API usage with no commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Non-crypto users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.675Z"},"updatedAt":"2026-04-22T01:01:58.998Z"}}