{"id":"b09f99a2-942b-438e-9320-3924fc64f281","shortId":"nHm3Sg","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 advertises a broad suite of APIs spanning data & analytics, 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 endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/resource/36` returns a live x402 challenge (HTTP 402) requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to address 0x1A2B…85F3 using the \"exact\" scheme with a 300-second timeout. The response MIME type is application/json and the input method is HTTP POST.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what `/api/resource/36` actually returns. The endpoint path (`/resource/36`) does not map to any of the named APIs listed on the homepage, so its specific function is unclear. Without documentation or sample payloads, agents must discover behavior empirically after payment.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No documentation available — docs, pricing, and README pages only show 'Connect wallet'","The endpoint path /api/resource/36 does not correspond to any named API on the homepage","No request or response schema is documented; behavior must be discovered after payment","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/resource/36","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/resource/36","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific resource path /api/resource/36 is not described anywhere on the site. The docs/pricing/README pages are all empty beyond a wallet connect 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'/request':13,28 '/resource/36':213 '0.02':12,27,86,133 '000':122 '0x1a2b':147 '0x8335':127 '20':121 '2913':128 '300':155 '402':117 '6':137 '85f3':148 'Base network API' 'USDC API' 'access':7,22,38 'actual':208 'address':146 'advertis':46 'agent':238 'ai':55 'analysi':59 'analyt':54 'api':6,21,37,51,98,177,222 'application/json':163 'base':9,24,94,123,130 'behavior':241 'broad':48 'call':4,19 'chain':144 'challeng':115 'classif':62 'commit':106 'connect':186 'content':192 'convers':79 'data':53 'decim':138 'discov':240 'doc':176 'document':171,201,234 'embed':63 'empir':242 'endpoint':32,82,109,211 'equal':132 'estim':73 'exact':151 'exampl':204 'exchang':68 'extrem':173 'feed':67 'financ':64 'function':230 'gas':72 'generat':80 'geocod':77 'given':134 'homepag':226 'http':116,169 'infrastructur':75 'input':166 'json-api' 'key':99 'learn':57 'limit':102 'list':223 'live':113 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':56 'map':216 'method':167 'micropayment API' 'mime':160 'minimum':105 'must':239 'name':221 'network':95 'no-api-key' 'no-rate-limit' 'on-chain':142 'openapi':196 'page':181 'path':212 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':89 'payload':237 'payment':42,139,244 'per':3,18,87 'post':170 'premium':5,20,36 'price':66,84,178 'prompt':188 'protocol':43 'provid':35 'quot':71 'rate':69,101 'readm':180 'render':183 'request':88,118 'request/response':199 'respons':159 'return':111,209 'sampl':236 'schema':200 'scheme':152 'second':156 'sentiment':58 'settl':141 'site':45 'span':52 'spars':174 'spec':197 'specif':108,229 'suit':49 'summar':61 'text':60 'timeout':157 'token':70 'type':161 'unclear':232 'unit':124 'usdc':15,30,91,126,135 'usdc-base' 'use':149 'util':76 'valid':78 'via':10,25,39 'wallet':187 'web3':65 'without':233 'x402':11,26,41,114 'x402 API' 'x402-payment'","prices":[{"id":"b0d9dff2-1686-4f27-9c16-5cb32b6be6fe","listingId":"b09f99a2-942b-438e-9320-3924fc64f281","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/resource/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:53.210Z"}],"sources":[{"listingId":"b09f99a2-942b-438e-9320-3924fc64f281","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:53.210Z","lastSeenAt":"2026-04-22T12:03:19.114Z"}],"details":{"listingId":"b09f99a2-942b-438e-9320-3924fc64f281","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without a payment SDK, you'll get a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/resource/36\n# Returns 402 with x402 challenge JSON.\n# Use an x402-compatible client to attach USDC payment on Base.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/resource/36"},{"claim":"Site lists APIs for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a paid JSON API endpoint without requiring API key registration","Agent-driven pay-per-call workflows settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can pay USDC on Base for per-request API access","Use cases where keyless, no-signup API access is preferred"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume batch processing where $0.02/request adds up without volume discounts","Anyone needing to know exactly what the endpoint returns before committing payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.511Z"},"updatedAt":"2026-04-22T12:03:19.114Z"}}