{"id":"2d3aee2c-6606-45d1-bc59-f2c2661e9b1b","shortId":"kJsAxr","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com/api/endpoint-61 is an x402-gated \"Premium API Access\" service settling payments in USDC on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913), which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider's landing page advertises a broad catalog of endpoints 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 priced at $0.02 per request. However, this specific endpoint (/api/endpoint-61) does not correspond to any of the named endpoints listed on the site. Its exact functionality is unclear; the x402 challenge describes it only as \"Premium API Access\" with a JSON MIME type and POST method.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the generic landing page, it is impossible to determine what data or computation this particular endpoint returns. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. Agents considering this endpoint should be aware that the actual capability behind /api/endpoint-61 is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["general","api-gateway"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["Endpoint /api/endpoint-61 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.","No OpenAPI schema, request format, or response format is documented anywhere.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","The provider lists many endpoints on the homepage but none at this specific path; it may be a test or placeholder endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-61","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/endpoint-61","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 zero documentation on what /api/endpoint-61 actually does — no OpenAPI schema, no request/response examples, and no description beyond the generic title. The docs pages are empty. This is effectively a stub 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'/request':12,30 '0.02':11,29,87,160 '000':78 '0x8335':83 '20':77 '2913':84 '6':92 'Base network API' 'USDC API' 'accept':69 'access':50,195 'actual':261 'addit':250 'advertis':123 'agent':252 'ai':132 'analysi':136 'analyt':131 'api':6,16,24,34,49,95,194,237 'attach':106 'awar':258 'base':8,26,58,79 'behind':263 'beyond':216 'broad':125 'call':4,22 'caller':104 'capabl':262 'catalog':126 'challeng':62,188 'classif':138 'commit':101 'comput':229 'confirm':63 'connect':245 'consid':253 'content':251 'convers':155 'correspond':170 'data':130,227 'decim':93 'describ':189 'determin':225 'doc':235 'document':215 'embed':139 'endpoint':38,65,128,166,176,232,255 'equal':86 'estim':149 'exact':71,182 'exact-schem':70 'exampl':212 'exchang':144 'feed':143 'financ':140 'function':183 'gas':148 'gate':47 'generat':156 'generic':218 'geocod':153 'header':111 'howev':163 'imposs':223 'infrastructur':151 'json':198 'json-response' 'key':17,35,96 'land':121,219 'learn':134 'limit':98 'list':177 'live':67 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-61':40 'machin':133 'method':203 'micropayment API' 'mime':199 'name':175 'network':59 'no-api-key' 'openapi':208 'page':122,220,240 'particular':231 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':53,73,110,116 'per':3,21,88,161 'post':202 'post-method' 'premium':5,23,48,193 'premium API' 'price':142,158,236 'prompt':247 'proof':117 'provid':119 'quot':147 'rate':97,145 'readm':239 'render':242 'request':89,162 'request/response':211 'requir':18,36,103 'return':233 'schema':209 'scheme':72 'sentiment':135 'servic':51 'settl':52 'simpli':105 'site':180 'span':129 'specif':165 'summar':137 'token':146 'type':200 'unclear':185 'undocu':266 'unit':80 'upfront':100 'usdc':14,32,55,82,90 'usdc-base' 'use':91 'util':152 'valid':114,154 'via':9,27 'wallet':246 'web3':141 'x':109 'x-payment':108 'x402':10,28,46,61,115,187 'x402 endpoint' 'x402-gated':45 'x402-payment'","prices":[{"id":"cc3f71b4-b879-4fcc-ba77-e0b24345a360","listingId":"2d3aee2c-6606-45d1-bc59-f2c2661e9b1b","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/endpoint-61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:35.520Z"}],"sources":[{"listingId":"2d3aee2c-6606-45d1-bc59-f2c2661e9b1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:35.520Z","lastSeenAt":"2026-04-22T15:00:38.584Z"}],"details":{"listingId":"2d3aee2c-6606-45d1-bc59-f2c2661e9b1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-61 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-61"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to an undocumented premium API endpoint via x402 micropayment","Agent-driven pay-per-call workflows on the Base network without API key management","Testing x402 payment flows against a live USDC-settled endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents that need keyless, pay-per-request API access","Low-cost micropayment API consumption at $0.02/call"],"notFor":["Users who need documented request/response schemas before integrating","Production workloads requiring guaranteed SLAs or detailed error handling","Anyone needing to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.261Z"},"updatedAt":"2026-04-22T15:00:38.584Z"}}