{"id":"963eafe5-655b-4565-ac7d-522551c21443","shortId":"bvAQ8Y","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, payable in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/207` is listed as \"Premium API Access\" but the crawled material does not clarify what data or functionality this particular route returns. The platform's homepage lists other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), but `/api/v1/payments/207` is not among those listed. It may be a generic or catch-all premium endpoint, or it may serve a specific function not documented on the public site.\n\nThe x402 challenge is live and well-formed: it requests an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) which equals $0.02. Payment is sent to address 0x1A2B…85F3. The endpoint accepts POST requests and returns application/json. No API keys or rate limits are advertised. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["general","api-marketplace"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The specific functionality of /api/v1/payments/207 is not documented anywhere on the site","All documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content","No request body schema or response schema is available — callers cannot know what to send or what to expect","This endpoint path does not appear in the site's own listed API catalog"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/207","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/207","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and the specific function of this endpoint is undefined. All doc pages return only 'Connect wallet' with no content. This is effectively a stub 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'/api/v1/payments/207':88,134 '/docs':219 '/pricing':220 '/readme':222 '/request':13,28 '0.02':12,27,75,193 '000':180 '0x1a2b':199 '0x8335':185 '20':179 '2913':186 '6':189 '85f3':200 'Base network API' 'USDC API access' 'accept':203 'access':7,22,38,94 'actual':236 'address':198 'advertis':216 'ai':64 'among':137 'analysi':120 'analyt':63 'api':6,21,37,60,93,210 'application/json':208 'base':9,24,83,181,188 'call':4,19 'catch':147 'catch-al':146 'challeng':166 'clarifi':101 'classif':122 'connect':227 'content':233 'convers':130 'crawl':97 'data':62,103 'decim':190 'document':159,217 'embed':123 'endpoint':32,49,87,116,150,202,241 'equal':192 'exact':176 'exchang':126 'feed':125 'financ':67 'form':172 'function':105,157 'generat':132 'generic':144 'geocod':128 'homepag':113 'host':56 'http-post' 'infrastructur':70 'json-response' 'key':211 'learn':66 'limit':214 'list':90,114,139 'live':168 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':65 'mani':48 'materi':98 'may':141,153 'metric':117 'micropayment API' 'network':84 'offer':50 'one':46 'page':218 'particular':107 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':78 'payment':42,177,194 'per':3,18,76 'platform':54,111 'post':204 'premium':5,20,36,92,149 'premium API' 'price':73,124 'prompt':229 'protocol':43 'provid':35 'public':162 'rate':127,213 'report':118 'request':77,174,205 'request/response':237 'return':109,207,224 'rout':108 'schema':238 'sent':196 'sentiment':119 'serv':154 'site':163 'span':61 'specif':86,156 'substant':232 'suit':58 'summar':121 'unit':182 'unknown':243 'usdc':15,30,80,184 'usdc-base' 'util':71 'valid':129 'via':10,25,39 'wallet':228 'web3':68 'well':171 'well-form':170 'x402':11,26,41,165 'x402 API' 'x402-payment'","prices":[{"id":"a81ef3bf-e15e-46c3-a037-db904c44b966","listingId":"963eafe5-655b-4565-ac7d-522551c21443","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/207","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:52.922Z"}],"sources":[{"listingId":"963eafe5-655b-4565-ac7d-522551c21443","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/207","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:52.922Z","lastSeenAt":"2026-04-22T09:01:16.602Z"}],"details":{"listingId":"963eafe5-655b-4565-ac7d-522551c21443","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/207 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/207"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/207"},{"claim":"The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a premium API endpoint with per-call USDC micropayments on Base","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents needing pay-per-call API access without API keys","Users who want low-cost per-request pricing with no commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone requiring non-crypto payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.646Z"},"updatedAt":"2026-04-22T09:01:16.602Z"}}