{"id":"cee1b782-0f14-4f86-92cd-23265ee03e9b","shortId":"KVztS4","kind":"x402","title":"Pay-per-call HR reviews endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call HR reviews endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/hr/reviews/49` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint appears to serve HR review data (likely employee or company review record #49), though the exact response schema is not documented. Payment is handled inline: callers send an X-PAYMENT header with a signed USDC payment on Base, and the server returns the resource upon verification.\n\nThe x402 challenge confirms the endpoint is live and accepts up to 20,000 base units of USDC (0.02 USD) per request. The platform advertises no API keys, no rate limits, and instant access across all its endpoints. Beyond this HR reviews endpoint, lowpaymentfee.com hosts endpoints spanning data analytics, AI/ML inference, finance/crypto data, and utility services — all at the same $0.02/request price point.\n\nDocumentation is extremely sparse. There is no OpenAPI spec, no request/response schema beyond the x402 output metadata, and the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt. The exact fields returned by this HR reviews endpoint, the meaning of the ID parameter (49), and whether other IDs are valid are all unknown. Agents should expect a JSON response but must handle the lack of a documented contract.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","hr-reviews","json-api","no-api-key"],"categories":["data","hr"],"synonyms":["HR review data","employee reviews API","human resources reviews","x402 paid API","lowpaymentfee","pay-per-call API","Base USDC API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Response format and fields are completely undocumented","The meaning of the path parameter '49' is unknown — unclear if other IDs are valid","All non-homepage pages (/api, /pricing, /README) returned only a 'Connect wallet' stub","The endpoint's actual data source and freshness are unverifiable"],"endpointUrl":"https://lowpaymentfee.com/api/v1/hr/reviews/49","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/reviews/49","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 there is no OpenAPI spec, no documented request/response schema, no examples, and the specific endpoint's purpose (HR reviews) is only inferable from the URL path. The crawled pages beyond the homepage are empty 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'/api/v1/hr/reviews/49':36 '/pricing':199 '/readme':201 '/request':176 '0.02':12,28,133,175 '000':128 '20':127 '49':80,226 'Base USDC API' 'HR review data' 'accept':124 'access':148 'across':149 'advertis':139 'agent':236 'ai/ml':164 'analyt':163 'api':53,141 'appear':68 'base':9,25,61,106,129 'beyond':153,191 'broad':46 'call':4,20 'caller':93 'catalog':47 'challeng':117 'compani':77 'confirm':118 'connect':208 'contract':250 'data':73,162,167 'document':88,179,249 'employe':75 'employee reviews API' 'endpoint':7,23,34,67,120,152,157,160,219 'exact':83,212 'expect':238 'extrem':181 'field':213 'finance/crypto':166 'handl':91,244 'header':99 'host':159 'hr':5,21,71,155,217 'hr-reviews' 'human resources reviews' 'id':224,230 'infer':165 'inlin':92 'instant':147 'json':240 'json-api' 'key':142 'lack':246 'like':74 'limit':145 'live':122 'lowpaymentfee' 'lowpaymentfee.com':41,158 'mean':221 'metadata':195 'minim':207 'must':243 'network':62 'no-api-key' 'offer':44 'openapi':186 'output':194 'page':202 'paramet':225 'part':38 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':89,98,104 'per':3,13,19,29,51,135 'platform':42,138 'point':178 'price':177 'prompt':210 'protocol':58 'rate':144 'record':79 'request':14,30,52,136 'request/response':189 'resolv':204 'resourc':112 'respons':84,241 'return':110,214 'review':6,22,72,78,156,218 'schema':85,190 'send':94 'serv':70 'server':109 'servic':170 'settl':54 'sign':102 'span':161 'spars':182 'spec':187 'specif':66 'though':81 'unit':130 'unknown':235 'upon':113 'usd':134 'usdc':16,32,64,103,132 'usdc-base' 'use':63 'util':169 'valid':232 'verif':114 'via':10,26,55 'wallet':209 'whether':228 'x':97 'x-payment':96 'x402':11,27,57,116,193 'x402 paid API' 'x402-payment'","prices":[{"id":"ff2370f0-d4a8-408f-b848-fd321b912605","listingId":"cee1b782-0f14-4f86-92cd-23265ee03e9b","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/reviews/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.885Z"}],"sources":[{"listingId":"cee1b782-0f14-4f86-92cd-23265ee03e9b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/hr/reviews/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.885Z","lastSeenAt":"2026-04-23T16:08:14.690Z"}],"details":{"listingId":"cee1b782-0f14-4f86-92cd-23265ee03e9b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/hr/reviews/49 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\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 up to 20,000 base units of USDC on Base (asset 0x8335…)","source_url":"https://lowpaymentfee.com/api/v1/hr/reviews/49"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC uses 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving HR review records programmatically with per-call payment","Integrating employee review data into agent workflows without subscription overhead","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents needing on-demand HR review data without API key registration","Developers experimenting with x402 micropayment-gated endpoints","Low-volume, pay-as-you-go access to structured HR data"],"notFor":["Production systems requiring documented response schemas and SLAs","Bulk retrieval of large HR datasets (no batch endpoint documented)","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.891Z"},"updatedAt":"2026-04-23T16:08:14.690Z"}}