{"id":"db4f5631-f79b-41bd-ac3b-04e4c26a7991","shortId":"SuyGZC","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-84`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is made inline via the X-PAYMENT header — no API keys, subscriptions, or rate limits are advertised.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, this particular endpoint path (`/api/endpoint-84`) does not match any of the documented API paths on the site, so its exact functionality is unclear.\n\nThe endpoint settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found during the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","http-post"],"categories":["api","misc"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["Endpoint path /api/endpoint-84 does not match any documented API path on the site — actual functionality is unknown","No OpenAPI schema, request/response examples, or meaningful documentation available","All doc/pricing/API pages render only 'Connect wallet' with no further content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-84","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/endpoint-84","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, the specific endpoint path /api/endpoint-84 does not correspond to any documented API on the site, no OpenAPI schema or examples exist, and all documentation pages render only a wallet-connect prompt with no useful content. The actual functionality of this endpoint is 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'/request':12,30,170 '0.02':11,29,94,169 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':205 '20':87 '300':213 '6':100 'Base network API' 'USDC micropayment API' 'accept':69 'access':48,67 'across':127 'address':201 'advertis':120,125 'ai':137 'analysi':141 'analyt':131 'api':6,16,24,34,46,66,113,185,237 'application/json':219 'base':8,26,56,73,89,207 'base-network' 'broader':122 'call':4,22 'categori':129 'challeng':76,210 'charg':83 'classif':144 'collect':40 'confirm':77 'connect':243 'content':249 'convers':161 'crawl':232 'crypto-paid API' 'data':130,134 'decim':101 'detail':223 'doc':234 'document':184,224 'embed':145 'endpoint':47,60,79,126,165,175,197 'estim':155 'exact':192 'exampl':226 'exchang':150 'export':135 'feed':149 'financ':146 'found':229 'four':128 'function':193 'gas':154 'generat':162 'geocod':159 'header':111 'host':38 'howev':172 'http-post' 'i.e':93 'infrastructur':157 'inlin':105 'insight':136 'json-response' 'key':17,35,114 'learn':139 'limit':118 'list':63,164 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,123 'machin':138 'made':104 'match':180 'maximum':85 'metric':132 'network':57 'no-api-key' 'openapi':221 'page':238 'particular':174 'path':176,186 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,102,110,199,215 'per':3,21,44,95 'platform':124 'premium':5,23,65 'premium API' 'price':148,171,235 'prompt':245 'protocol':53 'quot':153 'rate':117,151 'render':240 'report':133 'request':45,96 'requir':18,36 'respons':227 'return':218 'schema':222 'second':214 'sentiment':140 'settl':198 'share':166 'sinc':97 'site':189 'specif':59 'specifi':211 'subscript':115 'summar':143 'text':142 'timeout':216 'token':152 'unclear':195 'unit':90 'usdc':14,32,70,92,98,204 'usdc-settlement' 'use':99,203 'util':158 'valid':160 'via':9,27,49,106 'wallet':244 'web3':147 'x':109 'x-payment':108 'x402':10,28,51,75,209 'x402 endpoint' 'x402-payment'","prices":[{"id":"4f8e7abb-6a30-4049-98fd-92b9c1433905","listingId":"db4f5631-f79b-41bd-ac3b-04e4c26a7991","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/endpoint-84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:05.543Z"}],"sources":[{"listingId":"db4f5631-f79b-41bd-ac3b-04e4c26a7991","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:05.543Z","lastSeenAt":"2026-04-22T12:03:15.806Z"}],"details":{"listingId":"db4f5631-f79b-41bd-ac3b-04e4c26a7991","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-84 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/endpoint-84"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-84"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint 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 experimenting with x402 payment flows","Agents that can settle USDC on Base for per-call API access","Low-volume, no-commitment API consumption without signup"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.994Z"},"updatedAt":"2026-04-22T12:03:15.806Z"}}