{"id":"1c8542d6-805f-4a07-ae24-369fbf49b1f1","shortId":"wxpLTg","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 site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/112` is labeled \"Premium API Access\" in the x402 challenge. Its exact functionality beyond that label is not documented — the crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional detail. The x402 challenge confirms the endpoint is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given 6 decimals), and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys or rate limits are advertised; access is gated purely by the x402 payment header.\n\nBecause the site provides no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the actual input parameters and response format for this specific endpoint are unknown. Agents should treat this as a low-cost experimental endpoint and verify behavior with a test call.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, README, and API pages all return only 'Connect wallet'","The specific functionality of /api/v1/payments/112 is undocumented; 'Premium API Access' is the only descriptor","No OpenAPI schema or request/response examples provided","No information on uptime, SLAs, or rate limits beyond marketing claims of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/112","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/payments/112 is unclear beyond the generic label 'Premium API Access'. All doc pages returned only 'Connect wallet' with no 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'/request':13,28 '0.02':12,27,88,160 '000':154 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':169 '20':153 '6':162 'Base network API' 'USDC micropayment API' 'accept':146 'access':7,22,38,106,178 'actual':206 'addit':136 'address':168 'advertis':177 'agent':218 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,171 'base':9,24,96,155 'behavior':231 'beyond':114,200 'broad':48 'call':4,19,235 'catalog':49 'challeng':110,140 'charg':149 'classif':64 'confirm':141 'connect':131 'convers':81 'cost':226 'crawl':121 'crypto-paid API' 'data':57 'decim':163 'detail':137 'doc':122 'document':119,199 'embed':65 'endpoint':32,84,100,143,215,228 'estim':75 'exact':112 'exampl':196 'exchang':70 'experiment':227 'feed':69 'financ':66 'format':211 'function':113 'gas':74 'gate':180 'generat':82 'geocod':79 'given':161 'header':186 'host':46 'i.e':159 'infer':60 'infrastructur':77 'input':207 'json-response' 'key':172 'label':103,116 'land':202 'limit':175 'list':204 'live':145 'low':225 'low-cost':224 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':151 'network':97 'no-api-key' 'openapi':192 'page':126,203 'paramet':208 'pay':2,17,52,165 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,185 'per':3,18,53,89 'post':147 'post-method' 'premium':5,20,36,104 'premium API access' 'price':68,86,123 'prompt':133 'protocol':43 'provid':35,190 'pure':181 'quot':73 'rate':71,174 'readm':125 'request':54,90,148 'request/response':195 'respons':210 'return':128 'schema':193 'sentiment':61 'settl':91 'site':45,189 'span':56 'specif':99,214 'summar':63 'test':234 'token':72 'treat':220 'unit':156 'unknown':217 'usdc':15,30,93,158 'usdc-base' 'util':78 'valid':80 'verifi':230 'via':10,25,39 'wallet':132 'web3':67 'x402':11,26,41,109,139,184 'x402 API' 'x402-payment'","prices":[{"id":"b290663f-fa58-4958-b7e5-431a270c3921","listingId":"1c8542d6-805f-4a07-ae24-369fbf49b1f1","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:30.531Z"}],"sources":[{"listingId":"1c8542d6-805f-4a07-ae24-369fbf49b1f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:30.531Z","lastSeenAt":"2026-04-23T17:31:47.557Z"}],"details":{"listingId":"1c8542d6-805f-4a07-ae24-369fbf49b1f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/112 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/112"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Payment asset is USDC at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/112"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/112"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments 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 exploring x402 payment-gated APIs","Agents needing instant, keyless API access with crypto micropayments","Low-volume or experimental use cases at $0.02/request"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before calling","High-volume production workloads where per-request crypto settlement adds latency","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.661Z"},"updatedAt":"2026-04-23T17:31:47.557Z"}}