{"id":"ce94c093-3315-4255-9676-c07b300c2185","shortId":"TTe6vy","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-55`) is listed as \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per request. No API keys, rate limits, or upfront commitments are needed — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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, `/api/endpoint-55` does not correspond to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nThe endpoint accepts POST requests and returns `application/json`. Payment settles to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout. Documentation pages beyond the landing page are effectively empty (showing only a \"Connect wallet\" prompt), so request/response schemas are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","http-post"],"categories":["api","misc"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint path /api/endpoint-55 does not match any of the named endpoints listed on the provider's landing page; its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, request format, or response format is documented anywhere.","The exact purpose and data returned by this endpoint cannot be determined from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-55","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-55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, the specific functionality of /api/endpoint-55 is unknown — it doesn't match any named endpoint on the site. Documentation pages are empty, no OpenAPI schema exists, and no request/response examples are available. This is effectively a stub 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'/request':12,30,170 '0.02':11,29,94,169 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '20':87 '300':218 'Base network API' 'USDC micropayment API' 'accept':69,197 'access':48,67 'across':127 'address':206 'advertis':125 'ai':137 'analysi':141 'analyt':131 'api':6,16,24,34,46,66,98 'application/json':202 'attach':109 'base':8,26,56,73,89,212 'beyond':224 'broader':122 'call':4,22 'caller':107 'categori':129 'challeng':76,215 'classif':144 'collect':40 'commit':104 'confirm':77 'connect':234 'convers':161 'correspond':176 'crypto-paid API' 'data':130,134 'document':222 'effect':229 'embed':145 'empti':230 'endpoint':47,60,79,126,165,182,196 'estim':155 'exact':191 'exchang':150 'export':135 'feed':149 'financ':146 'four':128 'function':192 'gas':154 'generat':162 'geocod':159 'header':114 'host':38 'howev':172 'http-post' 'i.e':93 'infrastructur':157 'insight':136 'json-response' 'key':17,35,99 'land':187,226 'learn':139 'limit':101 'list':63,164 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,123 'machin':138 'maximum':85 'metric':132 'name':181 'need':106 'network':57 'no-api-key' 'page':188,223,227 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,113,119,203,220 'per':3,21,44,95 'platform':124 'post':198 'premium':5,23,65 'premium API access' 'price':148,171 'prompt':236 'proof':120 'protocol':53 'quot':153 'rate':100,151 'report':133 'request':45,96,199 'request/response':238 'requir':18,36,83 'return':201 'schema':239 'second':219 'sentiment':140 'settl':204 'share':166 'show':231 'simpli':108 'site':185 'specif':59 'specifi':216 'summar':143 'text':142 'timeout':221 'token':152 'unclear':194 'unit':90 'unknown':241 'upfront':103 'usdc':14,32,70,92,209 'usdc-base' 'use':208 'util':158 'valid':117,160 'via':9,27,49 'wallet':235 'web3':147 'x':112 'x-payment':111 'x402':10,28,51,75,118,214 'x402 API' 'x402-payment'","prices":[{"id":"71b11ed3-facc-4573-8177-717187bd4d7c","listingId":"ce94c093-3315-4255-9676-c07b300c2185","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-55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:57.792Z"}],"sources":[{"listingId":"ce94c093-3315-4255-9676-c07b300c2185","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:57.792Z","lastSeenAt":"2026-04-22T11:31:09.122Z"}],"details":{"listingId":"ce94c093-3315-4255-9676-c07b300c2185","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge confirms the endpoint is live, accepts POST, and requires max 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-55"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units equal to $0.02","source_url":"https://lowpaymentfee.com/api/endpoint-55"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages show only a Connect wallet prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API endpoint without needing to register or obtain API keys","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request services into agent workflows via x402"],"bestFor":["Developers who want instant API access without signup or subscriptions","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying per-request in USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone looking for free or trial-tier API access","Developers who need non-crypto payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.378Z"},"updatedAt":"2026-04-22T11:31:09.122Z"}}