{"id":"e6d4f43f-a059-40a0-8a97-953cd1c3287e","shortId":"YtaMqa","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API endpoint on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-66`) is listed as \"Premium API Access\" and accepts USDC payments at a maximum cost of $0.02 per request (20,000 base units of USDC with 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 broader lowpaymentfee.com platform advertises endpoints across several 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 priced uniformly at $0.02 per request. However, this listing covers `/api/endpoint-66` specifically, which is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The response MIME type is `application/json`. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","http-post"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all return only 'Connect wallet' with no content.","The purpose and functionality of /api/endpoint-66 ('Premium API Access') is completely undocumented; it is unclear what this endpoint does or what data it returns.","No OpenAPI spec, input schema, or output schema is provided beyond the basic x402 outputSchema stub.","The endpoint path '/api/endpoint-66' does not match any of the documented API paths on the landing page (which use /api/v1/ and /api/v2/ prefixes), raising questions about what this endpoint actually serves."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-66","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-66","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 zero documentation on what /api/endpoint-66 actually does, what inputs it expects, or what it returns. The docs, pricing, API, and README pages are all empty (just 'Connect wallet'). The listing is effectively a stub with confirmed liveness but no usable schema or 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'/api/endpoint-66':55,162 '/docs':219 '/pricing':220 '/readme':222 '/request':13,28 '0.02':12,27,71,155 '000':75 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':74 '402':196 '6':81 'Base network API' 'USDC API' 'accept':63 'access':42,61,171 'across':113 'actual':236 'address':206 'advertis':111 'ai':123 'analysi':127 'analyt':117 'api':6,21,40,60,84,170 'application/json':216 'attach':95 'base':9,24,50,76,202 'base-network' 'broader':108 'call':4,19 'caller':93 'categori':115 'challeng':194 'classif':130 'collect':34 'commit':90 'connect':227 'content':233 'convers':147 'cost':69 'cover':161 'data':116,120,178 'decim':82 'describ':166 'document':175,217 'embed':131 'endpoint':7,22,41,54,112,150,184,241 'estim':141 'exact':199 'exchang':136 'export':121 'feed':135 'financ':132 'form':192 'function':180 'gas':140 'generat':148 'geocod':145 'header':100 'host':32 'howev':158 'http':195 'http-post' 'infrastructur':143 'insight':122 'json-response' 'key':85 'learn':125 'limit':87 'list':57,160 'live':186 'lowpaymentfee' 'lowpaymentfee.com':31,109 'machin':124 'maximum':68 'metric':118 'micropayment API' 'mime':213 'network':51,203 'no-api-key' 'page':218 'pay':2,17,37,204 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,65,99,105 'per':3,18,38,72,156 'platform':110 'premium':5,20,59,169 'premium API' 'price':134,152 'prompt':229 'proof':106 'protocol':47 'quot':139 'rate':86,137 'report':119 'request':39,73,157 'request/response':237 'requir':92 'respons':212 'return':182,188,224 'schema':238 'scheme':198 'sentiment':126 'sever':114 'simpli':94 'specif':53,163 'substant':232 'summar':129 'text':128 'token':138 'type':214 'uniform':153 'unit':77 'unknown':243 'upfront':89 'usdc':15,30,64,79,209 'usdc-settlement' 'util':144 'valid':103,146 'via':10,25,43 'wallet':228 'web3':133 'well':191 'well-form':190 'x':98 'x-payment':97 'x402':11,26,45,104,193 'x402 endpoint' 'x402-payment'","prices":[{"id":"5cada381-bd96-4e74-b200-06a26df13aa6","listingId":"e6d4f43f-a059-40a0-8a97-953cd1c3287e","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-66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:07.332Z"}],"sources":[{"listingId":"e6d4f43f-a059-40a0-8a97-953cd1c3287e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:07.332Z","lastSeenAt":"2026-04-22T11:31:10.080Z"}],"details":{"listingId":"e6d4f43f-a059-40a0-8a97-953cd1c3287e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-66 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge on POST, confirming it is live","source_url":"https://lowpaymentfee.com/api/endpoint-66"},{"claim":"Max amount required is 20000 base units of USDC (6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-66"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-66"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) contain only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API resource with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to an undocumented premium endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-per-request API access","x402-compatible agents that can settle USDC on Base","Low-cost micropayment experimentation on the Base L2"],"notFor":["Users who need detailed documentation or a known response schema before calling","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.906Z"},"updatedAt":"2026-04-22T11:31:10.080Z"}}