{"id":"eea23b10-7ca9-4e77-9bf6-e2e582936fc0","shortId":"bZdTT2","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 hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, 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, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/payments/288` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts HTTP POST requests and returns application/json.\n\nHowever, the actual functionality behind this particular endpoint path (`/payments/288`) is unclear — the site's landing page lists many specific API paths (analytics, AI, finance, utils) but does not explicitly describe a `/payments/288` route. Documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation or example responses, the precise data or service returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint path /api/v1/payments/288 is not listed among the site's documented API routes — its actual functionality is unknown.","All documentation pages (docs, api, pricing, README) returned no substantive content, only a 'Connect wallet' prompt.","No OpenAPI spec, request schema, or response examples are available.","The site lists many API categories but provides no detail on what data or models back them — actual service quality is unverifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/288","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/v1/payments/288","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 requests or responses, and the specific purpose of /api/v1/payments/288 is not explained anywhere in the crawled material. The docs/pricing/README pages are all blank beyond a wallet connect 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'/payments/288':172,195 '/request':13,28 '0.02':12,27,87,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':151 'Base network API' 'USDC micropayment API' 'accept':156 'access':7,22,38,117 'actual':165 'ai':186 'ai/ml':59 'analysi':61 'analyt':58,185 'api':6,21,37,55,99,116,183,200 'application/json':162 'base':9,24,95,130,137 'base-network' 'behind':167 'broad':48 'call':4,19 'cannot':229 'catalog':49 'challeng':123 'classif':63 'commit':107 'confirm':231 'connect':207 'content':213 'convers':80 'crypto-paid API' 'data':57,222 'describ':193 'doc':199 'document':197,216 'embed':64 'endpoint':32,83,110,155,170,228 'equal':139 'estim':74 'exact':147 'exampl':218 'exchang':69 'explicit':192 'feed':68 'financ':65,187 'function':166 'gas':73 'generat':81 'geocod':78 'host':46 'howev':163 'http':157 'http-post' 'infrastructur':76 'json-response' 'key':100 'land':178 'limit':103 'list':113,180 'lowpaymentfee' 'lowpaymentfee.com':34 'made':143 'mani':181 'maxamountrequir':126 'minimum':106 'network':96 'page':179,198 'particular':169 'path':171,184 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,141 'per':3,18,53,88 'post':158 'precis':221 'premium':5,20,36,115 'premium API access' 'price':67,85,201 'prompt':209 'protocol':43 'provid':35 'quot':72 'rate':70,102 'readm':202 'request':54,89,159 'respons':219 'return':119,161,204,225 'rout':196 'scheme':148 'second':152 'sentiment':60 'servic':224 'settl':90 'site':45,176 'span':56 'specif':109,182 'substant':212 'summar':62 'timeout':153 'token':71 'unclear':174 'unit':131 'usdc':15,30,92,133 'usdc-settlement' 'util':77,188 'valid':79,121 'via':10,25,39,144 'wallet':208 'web3':66 'without':214 'x402':11,26,41,122,146 'x402 API' 'x402-payment'","prices":[{"id":"ecefd555-89dd-4787-9350-f284101b43a5","listingId":"eea23b10-7ca9-4e77-9bf6-e2e582936fc0","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/v1/payments/288","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:19.266Z"}],"sources":[{"listingId":"eea23b10-7ca9-4e77-9bf6-e2e582936fc0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/288","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:19.266Z","lastSeenAt":"2026-04-23T12:31:28.295Z"}],"details":{"listingId":"eea23b10-7ca9-4e77-9bf6-e2e582936fc0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/288 \\\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 site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per 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","source_url":"https://lowpaymentfee.com/api/v1/payments/288"}],"useCases":["Agents that need on-demand API access without API key registration","Programmatic pay-per-call access to various utility or data endpoints","Demonstrating x402 payment protocol integration for micropayments"],"bestFor":["Developers exploring x402 protocol-based API monetization","AI agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.403Z"},"updatedAt":"2026-04-23T12:31:28.295Z"}}