{"id":"be3a6b49-9e38-4630-8ca0-e7c1a0698530","shortId":"kjwSCF","kind":"x402","title":"Pay-per-call HR document endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call HR document endpoint on Base via x402 — $0.02 per request in USDC.","description":"This x402-enabled endpoint at `/api/v1/hr/documents/37` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network at $0.02 per request with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint probed (`/api/v1/hr/documents/37`) is labeled \"Premium API Access\" and accepts POST requests. It returns JSON (`application/json`). The x402 challenge confirms it is live, requesting a maximum of 20,000 base units of USDC (i.e., $0.02) per call, paid to address `0x1A2B...85F3` using the \"exact\" payment scheme on Base. The asset contract matches Base-native USDC (`0x8335...2913`).\n\nNotably, this particular endpoint (`/hr/documents/37`) is not listed on the provider's landing page, which advertises categories like Data & Analytics, AI & ML, Finance & Web3, and Infrastructure. There is no documentation describing what the HR documents resource returns, what input it expects, or what the \"37\" path parameter represents. Without further docs or an OpenAPI spec, the actual payload structure and semantics of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["data","api-infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","HR document API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/hr/documents/37 path is not listed on the provider's landing page — its purpose is unclear","No request body schema or response examples are documented anywhere","The path parameter '37' is unexplained — it may be a specific document ID but this is unconfirmed","Crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/hr/documents/37","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/hr/documents/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation for this specific HR documents endpoint, no request/response examples, and the endpoint isn't even listed on the provider's own landing page. The actual purpose and schema are 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'/hr/documents/37':159 '0.02':12,28,82,130 '000':124 '0x1a2b':136 '0x8335':153 '20':123 '2913':154 '37':199 '85f3':137 'Base network API' 'HR document API' 'USDC micropayment API' 'accept':105 'access':103 'actual':211 'address':135 'advertis':170 'ai':175 'ai/ml':60 'analyt':59,174 'api':56,87,102 'application/json':111 'asset':146 'base':9,25,79,125,144,150 'base-n':149 'base-network' 'broad':49 'call':4,20,132 'catalog':50 'categori':171 'challeng':114 'confirm':115 'contract':147 'crypto':63 'data':58,173 'describ':185 'doc':205 'document':6,22,184,189 'enabl':36 'endpoint':7,23,37,68,96,158,218 'exact':140 'expect':195 'financ':62,177 'hr':5,21,188 'http-post' 'i.e':129 'infer':61 'infrastructur':180 'input':193 'json':110 'json-response' 'key':88 'label':100 'land':167 'like':172 'limit':90 'list':162 'live':118 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':44 'match':148 'maximum':121 'ml':176 'nativ':151 'network':80 'notabl':155 'offer':47 'openapi':208 'page':168 'paid':133 'paramet':201 'part':41 'particular':157 'path':200 'pay':2,18,53 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':52 'payload':212 'payment':72,141 'per':3,13,19,29,54,83,131 'platform':45 'post':106 'premium':101 'probe':97 'protocol':73 'provid':165 'rate':89 'remain':219 'repres':202 'request':14,30,55,84,107,119 'requir':93 'resourc':190 'return':109,191 'scheme':142 'semant':215 'servic':66 'settl':74 'span':57 'spec':209 'specif':95 'structur':213 'subscript':92 'unit':126 'unknown':220 'usdc':16,32,76,128,152 'usdc-settlement' 'use':69,138 'util':65 'via':10,26 'web3':178 'without':203 'x402':11,27,35,71,113 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"7ee637fa-216a-420d-9f3a-86680cf4c5e1","listingId":"be3a6b49-9e38-4630-8ca0-e7c1a0698530","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/hr/documents/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.361Z"}],"sources":[{"listingId":"be3a6b49-9e38-4630-8ca0-e7c1a0698530","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/hr/documents/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.361Z","lastSeenAt":"2026-04-23T19:02:13.929Z"}],"details":{"listingId":"be3a6b49-9e38-4630-8ca0-e7c1a0698530","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/hr/documents/37 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/hr/documents/37"},{"claim":"The provider advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list an HR documents endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching HR-related document data via a single paid API call","Agent-driven document retrieval with automatic crypto micropayment","Programmatic access to premium content behind x402 paywall"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agents that can settle USDC on Base","Use cases requiring no API key management or subscription"],"notFor":["Users needing detailed documentation or OpenAPI specs before integrating","Bulk retrieval of large document sets at volume discounts","Users without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:10.672Z"},"updatedAt":"2026-04-23T19:02:13.929Z"}}