{"id":"3259b686-6eea-4246-b09b-a190786e3df3","shortId":"BQCQkv","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. The specific resource `/api/v1/accounts/27` is one of many endpoints offered by the platform, which spans four broad 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).\n\nThe endpoint is live and returns a valid x402 challenge. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The platform advertises a flat $0.02 per request across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific functionality behind `/api/v1/accounts/27` is unclear — the description simply says \"Premium API Access\" without detailing what data or service is returned. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further documentation. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The input schema indicates it accepts HTTP POST requests and is discoverable, but no request body schema or response format is documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/accounts/27 is undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request body format, or response examples are provided anywhere on the site.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no actual content.","The broader platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none have detailed docs — it is unclear whether these endpoints return real data or are placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/27","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/27","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 402 challenge, confirming it works. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/accounts/27 is undocumented. The broader site lists many endpoints but provides no detail on any of them beyond names and prices. This is effectively a stub 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'/request':13,28 '0.02':12,27,127,137 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':121 '6':130 'Base network API' 'USDC API' 'accept':213 'access':7,22,38,169 'across':140 'advertis':134 'ai':69 'amount':119 'analysi':73 'analyt':63 'api':6,21,37,145,168,182 'avail':207 'base':9,24,110,123 'base-network' 'behind':159 'bodi':223 'broad':60 'call':4,19 'categori':61 'challeng':104 'classif':76 'commit':153 'connect':188 'contract':114 'convers':93 'data':62,66,173 'decim':131 'descript':164 'detail':171,205 'discover':219 'doc':179 'document':194,206,229 'embed':77 'endpoint':32,52,96,142 'equal':126 'estim':87 'exampl':202 'exchang':82 'export':67 'feed':81 'financ':78 'flat':136 'format':227 'four':59 'function':158 'gas':86 'generat':94 'geocod':91 'howev':155 'http':214 'http-post' 'indic':211 'infrastructur':89 'input':209 'insight':68 'key':146 'learn':71 'limit':149 'live':98 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':70 'mani':51 'maximum':118 'metric':64 'micropayment API' 'minimum':152 'network':111 'no-api-key' 'offer':53 'one':49 'openapi':198 'page':183 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,105 'per':3,18,138 'platform':56,133 'post':215 'premium':5,20,36,167 'premium API access' 'price':80,180 'prompt':190 'protocol':43 'provid':35 'quot':85 'rate':83,148 'render':185 'report':65 'request':139,216,222 'request/response':201 'requir':154 'resourc':46 'respons':226 'return':100,177 'say':166 'schema':199,210,224 'sentiment':72 'servic':175 'settl':107 'simpli':165 'span':58 'specif':45,157 'summar':75 'text':74 'token':84 'unclear':162 'unit':124 'usdc':15,30,113,128 'usdc-settlement' 'use':112,129 'util':90 'valid':92,102 'via':10,25,39 'wallet':189 'web3':79 'without':170 'x402':11,26,41,103 'x402 API' 'x402-payment'","prices":[{"id":"56e8db70-a6da-4f5a-bb22-723c9fdaf300","listingId":"3259b686-6eea-4246-b09b-a190786e3df3","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:26.941Z"}],"sources":[{"listingId":"3259b686-6eea-4246-b09b-a190786e3df3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:26.941Z","lastSeenAt":"2026-04-23T09:00:48.941Z"}],"details":{"listingId":"3259b686-6eea-4246-b09b-a190786e3df3","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/27 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/27"},{"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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/27"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services paid per-call with USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents with Base USDC wallets needing on-demand API calls","Experimenting with x402 protocol payments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.883Z"},"updatedAt":"2026-04-23T09:00:48.941Z"}}