{"id":"2c256018-a92a-4723-b30d-fb5999d83eea","shortId":"GCbK4B","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/accounts/66` is listed under the provider's umbrella as \"Premium API Access\" but its exact functionality is not documented in the crawled material. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base. The response MIME type is application/json.\n\nThe provider's landing page advertises a broad suite of APIs (metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation), all at the same $0.02 price point. However, the docs, pricing, and README pages returned only a \"Connect wallet\" prompt with no further documentation. Because the specific behavior of the `/api/v1/accounts/66` endpoint is undocumented, callers should treat this as an exploratory integration until more details surface.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","crypto-payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The exact functionality of /api/v1/accounts/66 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec or request/response schema is available.","The broad suite of advertised APIs (AI, analytics, finance, etc.) could not be verified beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/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/v1/accounts/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is completely undocumented. Docs, pricing, and README pages all returned only 'Connect wallet' with no usable content. No OpenAPI schema, no request/response examples, and no description of what /api/v1/accounts/66 actually 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'/request':13,28 '0.02':12,27,73,141,196 '000':136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '20':135 'Base network API' 'USDC micropayment API' 'accept':127 'access':7,22,38,108 'address':147 'advertis':162 'ai':60 'analysi':174 'analyt':59 'api':6,21,37,85,107,167 'application/json':156 'base':9,24,81,137,150 'behavior':219 'broad':164 'call':4,19,144 'caller':226 'categori':56 'challeng':122 'charg':131 'classif':177 'commit':92 'confirm':123 'connect':209 'convers':189 'crawl':118 'data':58,170 'detail':236 'doc':201 'document':115,215 'embed':178 'endpoint':32,49,69,96,223 'estim':186 'exact':111 'exchang':181 'exploratori':232 'export':171 'feed':180 'financ':63 'function':112 'gas':185 'generat':191 'geocod':187 'howev':199 'includ':57 'infrastructur':66 'insight':172 'integr':233 'json-response' 'key':86 'land':160 'learn':62 'limit':89 'list':99 'live':126 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'materi':119 'maximum':133 'metric':168 'mime':153 'network':82 'no-api-key' 'offer':50 'one':46 'page':161,205 'paid':76 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42 'per':3,18,74,143 'point':198 'post':128 'post-method' 'premium':5,20,36,106 'price':71,179,197,202 'prompt':211 'protocol':43 'provid':35,53,102,158 'quot':184 'rate':88,182 'readm':204 'report':169 'request':75,129 'requir':93 'respons':152 'return':206 'sentiment':173 'settl':145 'span':55 'specif':95,218 'suit':165 'summar':176 'surfac':237 'text':175 'token':183 'treat':228 'type':154 'umbrella':104 'undocu':225 'unit':138 'usd':142 'usdc':15,30,78,140 'usdc-base' 'util':67 'valid':188 'via':10,25,39 'wallet':210 'web3':64 'x402':11,26,41,121 'x402 premium API' 'x402-payment'","prices":[{"id":"2811d3a2-6664-4323-8abe-1c91219e718e","listingId":"2c256018-a92a-4723-b30d-fb5999d83eea","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/accounts/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":"2026-04-18T18:39:58.282Z"}],"sources":[{"listingId":"2c256018-a92a-4723-b30d-fb5999d83eea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:58.282Z","lastSeenAt":"2026-04-22T05:30:47.956Z"}],"details":{"listingId":"2c256018-a92a-4723-b30d-fb5999d83eea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/66 \\\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":"Endpoint returns 402 with x402 challenge, confirming it is live on Base with USDC payment","source_url":"https://lowpaymentfee.com/api/v1/accounts/66"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/accounts/66"},{"claim":"Provider advertises endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium data or services without API key management","Agent-driven workflows that need instant, keyless API access with crypto micropayments","Exploring a multi-category API marketplace (analytics, AI, finance, utilities) at low per-call cost"],"bestFor":["Developers or agents who want frictionless pay-per-use API access on Base","Use cases where avoiding API key provisioning and rate limits is valuable","Low-volume or exploratory integrations at $0.02 per call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call crypto settlement overhead matters","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:37.452Z"},"updatedAt":"2026-04-22T05:30:47.956Z"}}