{"id":"eb1920d6-f6d9-4753-a1e8-320929c8b02e","shortId":"p2DDkN","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 provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/benefits/86` is listed as \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base units of USDC (0.02 USD given 6 decimals) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base, with a 300-second timeout. The response MIME type is `application/json`.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/benefits/86` endpoint actually returns. Prospective callers should be aware that the exact input parameters and output format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["premium API","x402 API","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The exact functionality of /api/v1/benefits/86 is unknown — 'Premium API Access' is the only description provided.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No OpenAPI schema or request/response examples are available.","No information on what input parameters the POST endpoint expects."],"endpointUrl":"https://lowpaymentfee.com/api/v1/benefits/86","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/86","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 the specific functionality of /api/v1/benefits/86 is completely undocumented. No OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'0.02':10,24,90,149 '000':144 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':161 '20':143 '300':166 '6':152 'Base network API' 'USDC API' 'accept':136 'access':6,20,36,118 'actual':213 'address':160 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,100,117,181 'application/json':174 'awar':219 'base':8,22,43,97,145,163 'base-network' 'behind':37 'beyond':126 'broad':49 'call':55,155 'caller':216 'catalog':50 'challeng':131 'classif':66 'commit':107 'confirm':132 'connect':190 'content':196 'convers':83 'data':58 'decim':153 'descript':207 'doc':180 'document':125,175 'embed':67 'endpoint':30,86,111,212 'estim':77 'exact':121,222 'exampl':204 'exchang':72 'extrem':177 'feed':71 'financ':68 'format':227 'function':122 'gas':76 'gate':3,17 'generat':84 'geocod':81 'given':151 'host':47 'infrastructur':79 'input':223 'json-response' 'key':101 'label':128 'learn':62 'limit':104 'list':114 'live':135 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':158 'micropayment API' 'mime':171 'network':44 'no-api-key' 'openapi':200 'output':226 'page':185 'paramet':224 'pay':9,23,53 'pay-per-cal':52 'pay-per-call API' 'pay-per-request' 'payment':156 'paywal':40 'per':11,25,54,91,154 'post':137 'post-method' 'premium':4,18,34,116 'premium API' 'price':70,88,182 'prompt':192 'prospect':215 'provid':33 'quot':75 'rate':73,103 'readm':184 'render':187 'request':12,26,92,138 'request/response':203 'requir':108,140 'respons':170 'return':214 'schema':201 'second':167 'sentiment':63 'settl':93 'site':46 'span':57 'spars':178 'specif':110 'summar':65 'timeout':168 'token':74 'type':172 'unit':146 'unknown':229 'usd':150 'usdc':14,28,95,148 'usdc-settlement' 'util':80 'valid':82 'wallet':191 'web3':69 'x402':2,16,39,130 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b30ac6a2-6f21-4eb3-8a67-1d6462670bdd","listingId":"eb1920d6-f6d9-4753-a1e8-320929c8b02e","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/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T20:29:39.499Z"}],"sources":[{"listingId":"eb1920d6-f6d9-4753-a1e8-320929c8b02e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/benefits/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T20:29:39.499Z","lastSeenAt":"2026-04-22T04:02:20.323Z"}],"details":{"listingId":"eb1920d6-f6d9-4753-a1e8-320929c8b02e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/benefits/86 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/86"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/benefits/86"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Exploring x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 pay-per-call patterns","Agents that can settle USDC payments on Base automatically","Users who want keyless, commitment-free API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.41Z"},"updatedAt":"2026-04-22T04:02:20.323Z"}}