{"id":"a23a77d8-061e-41ce-81c8-5e871116bc3b","shortId":"Jx3dsk","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/81` is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds. The response MIME type is application/json.\n\nHowever, the specific functionality behind `/api/v1/accounts/81` is unclear. The provider's landing page lists various API categories (metrics, reports, sentiment analysis, summarization, price feeds, geocoding, etc.) but does not document this particular accounts endpoint. No OpenAPI spec, request/response schemas, or detailed documentation were found in the crawl. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the actual data returned by this endpoint and the expected request body format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","accounts API","micropayment API"],"warnings":["The specific functionality of /api/v1/accounts/81 is not documented anywhere on the site","No OpenAPI spec, request schema, or response schema available","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","The 'accounts/81' path suggests a resource-specific endpoint but its purpose is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's purpose, request format, and response schema are entirely undocumented. No OpenAPI spec exists, and all documentation pages returned only a wallet-connect prompt with no 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'/request':13,28 '0.02':12,27,75,125 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':119 '20':113 '2913':120 '300':140 '6':123 'Base network API' 'USDC API' 'accept':104 'access':7,22,38 'account':180 'accounts API' 'actual':217 'address':133 'ai':61 'analysi':168 'analyt':60 'api':6,21,37,87,163,198 'application/json':147 'base':9,24,83,115,122 'behind':152 'bodi':227 'call':4,19,127 'categori':69,164 'challeng':98 'commit':94 'confirm':99 'connect':206 'content':212 'crawl':194 'data':59,218 'decim':124 'detail':188 'doc':196 'document':177,189 'endpoint':32,52,71,101,181,222 'etc':173 'exact':110 'expect':225 'feed':171 'financ':64 'format':228 'found':191 'function':151 'geocod':172 'howev':148 'infrastructur':67 'json-api' 'key':88 'land':159 'learn':63 'limit':91 'list':161 'live':103 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':62 'mani':51 'maximum':137 'metric':165 'micropayment API' 'mime':144 'network':84 'no-api-key' 'no-rate-limit' 'offer':53 'one':49 'openapi':183 'page':160,201 'particular':179 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,111,129 'per':3,18,76,126 'platform':56 'post':105 'premium':5,20,36 'premium API' 'price':73,170,197 'prompt':208 'protocol':43 'provid':35,157 'rate':90 'readm':200 'remain':229 'report':166 'request':77,106,226 'request/response':185 'requir':95,108 'resourc':46 'respons':143 'result':215 'return':203,219 'schema':186 'second':141 'sent':131 'sentiment':167 'settl':78 'span':58 'spec':184 'specif':45,150 'substant':211 'summar':169 'timeout':138 'type':145 'unclear':155 'unit':116 'unknown':230 'usdc':15,30,80,118 'usdc-base' 'util':68 'various':162 'via':10,25,39 'wallet':207 'web3':65 'x402':11,26,41,97 'x402 endpoint' 'x402-payment'","prices":[{"id":"62572e8d-655c-460e-8541-5195e04e5efb","listingId":"a23a77d8-061e-41ce-81c8-5e871116bc3b","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:10.935Z"}],"sources":[{"listingId":"a23a77d8-061e-41ce-81c8-5e871116bc3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:10.935Z","lastSeenAt":"2026-04-22T16:30:56.346Z"}],"details":{"listingId":"a23a77d8-061e-41ce-81c8-5e871116bc3b","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl as a conceptual example (actual payment header must be constructed per x402 spec):\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/81 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/81"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or account information with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer no subscription commitments"],"notFor":["Users needing well-documented API contracts with clear request/response schemas","High-volume use cases where per-request crypto payments add overhead","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.872Z"},"updatedAt":"2026-04-22T16:30:56.346Z"}}