{"id":"5fa73dcf-1328-4c64-bf86-cb2e868a4ac6","shortId":"fjpL9m","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-77`) 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 subscriptions 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, this particular endpoint path (`/api/endpoint-77`) does not match any of the documented API paths on the site, so its exact functionality is unclear.\n\nThe endpoint accepts POST requests and returns `application/json`. Settlement occurs on the Base L2 network using USDC (contract `0x8335…2913`). The x402 challenge specifies a 300-second payment timeout. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["Endpoint path /api/endpoint-77 does not match any of the documented API paths on lowpaymentfee.com — actual functionality is unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content","No input schema or output schema is documented; callers cannot know what request body to send or what response to expect","The 'Premium API Access' description is generic and does not explain what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-77","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-77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and priced at $0.02 USDC on Base, but the endpoint path (/api/endpoint-77) doesn't match any documented API on the site. Documentation pages are empty (just 'Connect wallet'). No input/output schema, no examples, and no description of what this specific endpoint actually 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'/request':12,30,169 '0.02':11,29,94,168 '000':88 '0x8335':213 '20':87 '2913':214 '300':220 'Base network API' 'USDC micropayment API' 'accept':69,197 'access':48,67 'across':126 'advertis':124 'ai':136 'analysi':140 'analyt':130 'api':6,16,24,34,46,66,98,184,233 'application/json':202 'attach':108 'base':8,26,56,73,89,207 'base-network' 'broader':121 'call':4,22 'caller':106 'categori':128 'challeng':76,217 'classif':143 'collect':40 'confirm':77 'connect':242 'content':248 'contract':212 'convers':160 'crypto-paid endpoint' 'data':129,133 'doc':232 'document':183,224 'embed':144 'endpoint':47,60,79,125,164,174,196 'estim':154 'exact':191 'exchang':149 'export':134 'extrem':229 'feed':148 'financ':145 'four':127 'function':192 'gas':153 'generat':161 'geocod':158 'header':113 'host':38 'howev':171 'http-post' 'i.e':93 'infrastructur':156 'insight':135 'json-response' 'key':17,35,99 'l2':208 'learn':138 'limit':101 'list':63,163 'live':81 'lowpaymentfee' 'lowpaymentfee.com':37,122 'machin':137 'match':179 'maximum':85 'metric':131 'need':105 'network':57,209 'no-api-key' 'occur':204 'page':237 'particular':173 'path':175,185 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,112,118,222 'per':3,21,44,95 'platform':123 'post':198 'premium':5,23,65 'premium API access' 'price':147,170,234 'prompt':244 'proof':119 'protocol':53 'quot':152 'rate':100,150 'readm':236 'render':239 'report':132 'request':45,96,199 'requir':18,36,83 'return':201 'second':221 'sentiment':139 'settlement':203 'share':165 'simpli':107 'site':188,227 'specif':59 'specifi':218 'subscript':103 'substant':247 'summar':142 'text':141 'thin':230 'timeout':223 'token':151 'unclear':194 'unit':90 'usdc':14,32,70,92,211 'usdc-settlement' 'use':210 'util':157 'valid':116,159 'via':9,27,49 'wallet':243 'web3':146 'x':111 'x-payment':110 'x402':10,28,51,75,117,216 'x402 API' 'x402-payment'","prices":[{"id":"1638bccd-dfef-4371-bf21-0c515f00ec2f","listingId":"5fa73dcf-1328-4c64-bf86-cb2e868a4ac6","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-77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:22.758Z"}],"sources":[{"listingId":"5fa73dcf-1328-4c64-bf86-cb2e868a4ac6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:22.758Z","lastSeenAt":"2026-04-23T00:31:02.259Z"}],"details":{"listingId":"5fa73dcf-1328-4c64-bf86-cb2e868a4ac6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-77 \\\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 returns maxAmountRequired of 20000 base units of USDC on Base (= $0.02)","source_url":"https://lowpaymentfee.com/api/endpoint-77"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-77"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Documented API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Integrating x402-compatible endpoints into automated pipelines without subscription management"],"bestFor":["Developers or agents already set up with x402 payment flows on Base","Use cases requiring low-friction, no-signup API access at $0.02/call","Crypto-native applications that prefer on-chain settlement over traditional billing"],"notFor":["Users who need detailed API documentation or well-defined input/output schemas before integrating","High-volume callers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible wallet or x402 payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:51:29.744Z"},"updatedAt":"2026-04-23T00:31:02.259Z"}}