{"id":"efbc8fd3-de79-4ce9-925e-e98ed52c0858","shortId":"btWZnA","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 broader platform offering pay-per-request APIs across data & analytics, AI/ML, finance/Web3, and infrastructure categories — all gated via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/benefits/35` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The platform advertises uniform $0.02-per-request pricing with no API keys, no rate limits, and instant access.\n\nPayment is settled in USDC (contract 0x8335…2913) on Base. The x402 challenge shows a maxAmountRequired of 20,000 base units, which at 6 decimals equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns application/json. No OpenAPI schema, request body schema, or response schema is provided, so the exact input/output contract is unknown.\n\nThe platform hosts numerous other endpoints covering sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 price point. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, making it impossible to verify what data or functionality this specific endpoint actually delivers.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-gateway"],"synonyms":["premium API","paid API access","x402 API","lowpaymentfee","micropayment API","USDC API","Base network API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","The exact functionality of /api/v1/benefits/35 ('Premium API Access') is completely undocumented","No request body schema or response schema provided","No OpenAPI spec or AI plugin manifest found","Cannot verify what data or service this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/35","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' at /api/v1/benefits/35 actually returns. All doc pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':10,24,87,128,187 '000':120 '0x8335':108 '20':119 '2913':109 '6':125 'Base network API' 'USDC API' 'accept':138 'access':6,20,72,101 'across':45 'actual':217 'advertis':85,134 'ai/ml':48 'analysi':170 'analyt':47 'api':5,19,44,71,94 'application/json':143 'base':8,22,62,111,121 'base-network' 'beyond':80 'bodi':148 'broader':37 'categori':52 'challeng':114 'classif':173 'connect':198 'consist':129 'content':204 'contract':107,159 'cover':168 'data':46,211 'decim':126 'deliv':218 'doc':192 'document':79,190 'embed':174 'endpoint':30,66,137,167,216 'equal':127 'exact':75,157 'exchang':177 'feed':176 'finance/web3':49 'function':76,213 'gate':3,17,54 'geocod':179 'host':164 'imposs':207 'infrastructur':51 'input/output':158 'instant':100 'json-response' 'key':95 'label':69 'limit':98 'lowpaymentfee' 'lowpaymentfee.com':32 'make':205 'maxamountrequir':117 'micropayment API' 'network':63 'no-api-key' 'numer':165 'offer':39 'openapi':145 'page':191 'paid API access' 'part':34 'pay':9,23,41 'pay-per-request':40 'payment':58,102 'per':11,25,42,89 'per-request':88 'platform':38,84,163 'point':189 'post':139 'post-method' 'premium':4,18,70 'premium API' 'price':91,135,175,188,193 'prompt':200 'protocol':59 'provid':154 'rate':97,178 'readm':194 'request':12,26,43,90,140,147 'respons':151 'return':142,195 'schema':146,149,152 'sentiment':169 'settl':104 'show':115 'site':132 'specif':65,215 'substant':203 'summar':172 'text':171 'titl':82 'uniform':86 'unit':122 'unknown':161 'usdc':14,28,106 'usdc-settlement' 'valid':180 'verifi':209 'via':55 'wallet':199 'x402':2,16,57,113 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"c42f3dc7-9946-4adb-8e5c-edc04f554463","listingId":"efbc8fd3-de79-4ce9-925e-e98ed52c0858","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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:33.464Z"}],"sources":[{"listingId":"efbc8fd3-de79-4ce9-925e-e98ed52c0858","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:33.464Z","lastSeenAt":"2026-04-22T05:31:53.801Z"}],"details":{"listingId":"efbc8fd3-de79-4ce9-925e-e98ed52c0858","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/35 \\\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":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/35"},{"claim":"The endpoint is described as 'Premium API Access' and accepts POST requests returning application/json","source_url":"https://lowpaymentfee.com/api/v1/benefits/35"}],"useCases":["Accessing premium data or services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to gated endpoints via x402 protocol"],"bestFor":["Developers who want keyless, pay-per-call API access","AI agents with x402 payment capability on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:26.515Z"},"updatedAt":"2026-04-22T05:31:53.801Z"}}