{"id":"293281db-0948-49ff-b494-bfea9ffe9922","shortId":"ZQVXdV","kind":"x402","title":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base network via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com/api/endpoint-88 is an x402-enabled pay-per-request API labeled \"Premium API Access.\" It accepts POST requests and charges 20,000 base units of USDC (0x8335…2913 on Base network), which equals $0.02 per call. Payment is made via the x402 protocol's X-PAYMENT header with no API keys or rate limits required.\n\nThe provider's site advertises a broad suite of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, this specific endpoint (/api/endpoint-88) does not correspond to any of the named endpoints listed on the site, and no documentation describes what it actually returns. The output schema only specifies that it accepts HTTP POST and is discoverable.\n\nWithout further documentation or example responses, the exact functionality of endpoint-88 remains unclear. The endpoint is confirmed live (returns a valid 402 challenge), settles on Base mainnet in USDC, and has a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network endpoint","lowpaymentfee","premium access endpoint"],"warnings":["Endpoint /api/endpoint-88 is not listed among the provider's documented APIs — its actual functionality is unknown.","No OpenAPI spec, no request/response examples, and docs pages only show 'Connect wallet' with no content.","The provider site lists many endpoints but provides no technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-88","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-88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example request/response, and the endpoint path (/api/endpoint-88) does not match any documented API on the site. Functionality is entirely unknown beyond the generic label 'Premium API 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'/api/endpoint-88':42,141 '/request':18,36 '0.02':17,35,76 '000':64 '0x8335':69 '20':63 '2913':70 '300':209 '402':198 'Base network endpoint' 'USDC pay-per-call' 'accept':58,170 'access':56 'actual':161 'advertis':103 'ai':112 'analysi':116 'analyt':111 'api':6,24,52,55,93 'base':9,27,65,72,202 'base-network' 'broad':105 'call':4,22,78 'challeng':199 'charg':62 'classif':118 'confirm':193 'convers':135 'correspond':144 'data':110 'describ':158 'discover':175 'document':157,178 'embed':119 'enabl':47 'endpoint':7,25,38,108,140,150,186,191 'equal':75 'estim':129 'exact':183 'exampl':180 'exchang':124 'feed':123 'financ':120 'function':184 'gas':128 'generat':136 'geocod':133 'header':90 'howev':137 'http':171 'http-post' 'infrastructur':131 'key':94 'label':53 'learn':114 'limit':97 'list':151 'live':194 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-88':40 'machin':113 'made':81 'mainnet':203 'micropayment API' 'name':149 'network':10,28,73 'no-api-key' 'output':164 'pay':2,20,49 'pay-per-cal':1,19 'pay-per-request':48 'payment':79,89,211 'per':3,21,50,77 'post':59,172 'premium':5,23,54 'premium access endpoint' 'price':122 'protocol':85 'provid':100 'quot':127 'rate':96,125 'remain':188 'request':51,60 'requir':98 'respons':181 'return':162,195 'schema':165 'second':210 'sentiment':115 'settl':13,31,200 'site':102,154 'span':109 'specif':139 'specifi':167 'suit':106 'summar':117 'timeout':212 'token':126 'unclear':189 'unit':66 'usdc':15,33,68,205 'usdc-settlement' 'util':132 'valid':134,197 'via':11,29,82 'web3':121 'without':176 'x':88 'x-payment':87 'x402':12,30,46,84 'x402 API' 'x402-enabled':45 'x402-payment'","prices":[{"id":"bca87ead-43c4-4b2b-9b02-0a5001c5f446","listingId":"293281db-0948-49ff-b494-bfea9ffe9922","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-88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:34.284Z"}],"sources":[{"listingId":"293281db-0948-49ff-b494-bfea9ffe9922","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:34.284Z","lastSeenAt":"2026-04-22T23:01:01.983Z"}],"details":{"listingId":"293281db-0948-49ff-b494-bfea9ffe9922","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-88 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-88"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/endpoint-88"}],"useCases":["Agent-initiated API calls with automatic USDC micropayments","Accessing premium data or services without subscription or API key management","Programmatic pay-per-use access from autonomous agents on Base network"],"bestFor":["Agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-cost per-request usage without rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLA before integrating","High-volume batch workloads where $0.02/request adds up significantly","Anyone unable to transact on Base network or lacking USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.562Z"},"updatedAt":"2026-04-22T23:01:01.983Z"}}