{"id":"00500567-e88c-4d8d-88a3-6fcfcb412aeb","shortId":"DZQF2N","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 lowpaymentfee.com platform, which hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/185` returned a live 402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts POST requests and returns application/json.\n\nHowever, the crawled documentation pages (docs, api, pricing, README) all rendered only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind this specific `/payments/185` path is unclear. The landing page lists 16 other endpoints across four categories but does not mention `/api/v1/payments/185` by name. Without further documentation or example responses, the precise data or service returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","x402 api","micropayment api","pay-per-call api","USDC api access","base network api","low fee api"],"warnings":["The specific endpoint /api/v1/payments/185 is not listed among the 16 APIs on the landing page — its actual functionality is unknown.","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response examples are available.","The purpose and output of this endpoint cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/185","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/payments/185","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, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of /api/v1/payments/185 is not described anywhere in the crawled content. The docs/pricing/README pages are all blank beyond a wallet connect 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'/payments/185':177 '/request':13,28 '0.02':12,27,81,125 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x8335':119 '16':185 '20':113 '2913':120 '402':107 '6':129 'USDC api access' 'accept':144 'access':7,22,38 'across':188 'actual':172 'address':140 'ai':68 'analyt':67 'api':6,21,37,64,93,156 'application/json':149 'base':9,24,89,115,122 'base network api' 'behind':174 'call':4,19 'cannot':213 'categori':190 'challeng':108 'collect':58 'commit':98 'confirm':215 'connect':163 'content':169 'crawl':152 'data':66,206 'decim':130 'doc':155 'document':153,200 'endpoint':32,49,77,102,143,187,212 'equal':124 'exact':137 'exampl':202 'financ':71 'four':189 'function':173 'given':126 'host':56 'howev':150 'infrastructur':74 'json-response' 'key':94 'land':182 'learn':70 'limit':96 'list':184 'live':106 'low fee api' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'made':133 'mani':48 'maxamountrequir':111 'mention':194 'micropayment api' 'name':197 'network':90 'no-api-key' 'offer':50 'one':46 'page':154,183 'path':178 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request':60 'payment':42,131 'per':3,18,62,82 'platform':54 'post':145 'post-method' 'precis':205 'premium':5,20,36 'price':79,157 'prompt':165 'protocol':43 'provid':35 'rate':95 'readm':158 'render':160 'request':63,83,146 'requir':99 'respons':203 'return':104,148,209 'scheme':138 'servic':208 'settl':84 'span':65 'specif':101,176 'substant':168 'unclear':180 'unit':116 'usdc':15,30,86,118,127 'usdc-base' 'util':75 'via':10,25,39,134 'wallet':164 'web3':72 'without':198 'x402':11,26,41,136 'x402 api' 'x402-payment'","prices":[{"id":"e6b969d6-29d2-4953-9ed2-842ed2e5b1d2","listingId":"00500567-e88c-4d8d-88a3-6fcfcb412aeb","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/payments/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.015Z"}],"sources":[{"listingId":"00500567-e88c-4d8d-88a3-6fcfcb412aeb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/185","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.015Z","lastSeenAt":"2026-04-22T23:01:41.917Z"}],"details":{"listingId":"00500567-e88c-4d8d-88a3-6fcfcb412aeb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/185 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/185"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/185"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers 16 endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Testing x402 payment protocol integrations with low-cost endpoints"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that need keyless, pay-per-request access to utility endpoints","Users who want to avoid subscriptions and pay only per call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.081Z"},"updatedAt":"2026-04-22T23:01:41.917Z"}}