{"id":"dfc64b20-5754-4737-bfa4-c0b76705e8cb","shortId":"XuzPDY","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 collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/payments/168` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, charges a maximum of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) on Base, and returns application/json. The platform's landing page lists sibling endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\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, and no usage examples available from the crawl. The actual behavior and input/output format of this particular endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC pay-per-call","Base network API","micropayment API","low fee API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.","The specific functionality of /api/v1/payments/168 ('Premium API Access') is not described anywhere; it is unclear what this endpoint actually does.","No OpenAPI spec or request/response schema is provided.","No examples of request bodies or response payloads are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/168","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/payments/168 is undefined. This is effectively a stub 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'/api/v1/payments/168':103 '/docs':200 '/pricing':202 '/readme':204 '/request':13,28 '0.02':12,27,81,144,192 '000':138 '20':137 '6':148 'Base network API' 'USDC pay-per-call' 'accept':130 'access':7,22,38,108 'actual':234 'ai':68 'analysi':170 'analyt':67 'api':6,21,37,64,93,107 'application/json':154 'avail':229 'base':9,24,89,139,151 'behavior':235 'beyond':120 'call':4,19 'challeng':112,125 'charg':133 'classif':173 'collect':58 'commit':98 'confirm':126 'connect':210 'content':216 'convers':185 'crawl':232 'data':66,166 'decim':149 'document':119,195 'embed':174 'endpoint':32,49,77,102,162,242 'estim':182 'exact':115 'exampl':228 'exchang':177 'export':167 'extrem':197 'feed':176 'financ':71 'format':238 'function':116 'gas':181 'generat':187 'geocod':183 'given':145 'host':56 'i.e':143 'infrastructur':74 'input/output':237 'insight':168 'json-response' 'key':94 'label':105,122 'land':158 'learn':70 'limit':96 'list':160 'live':129 'low fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':135 'metric':164 'micropayment API' 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':220 'page':159,205 'particular':241 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-request':60 'payment':42 'per':3,18,62,82 'platform':54,156 'point':194 'post':131 'post-method' 'premium':5,20,36,106 'premium API' 'price':79,175,193 'prompt':212 'protocol':43 'provid':35 'quot':180 'rate':95,178 'remain':243 'render':207 'report':165 'request':63,83,132 'request/response':223 'requir':99 'return':153 'schema':224 'sentiment':169 'settl':84 'sibl':161 'span':65 'spars':198 'spec':221 'specif':101 'summar':172 'text':171 'token':179 'unclear':244 'unit':140 'usag':227 'usdc':15,30,86,142,146 'usdc-base' 'util':75 'valid':184 'via':10,25,39 'wallet':211 'web3':72 'x402':11,26,41,111,124 'x402 API' 'x402-payment'","prices":[{"id":"05bbf14a-af1a-4f06-a369-0eb08c775f0d","listingId":"dfc64b20-5754-4737-bfa4-c0b76705e8cb","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:41.516Z"}],"sources":[{"listingId":"dfc64b20-5754-4737-bfa4-c0b76705e8cb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:41.516Z","lastSeenAt":"2026-04-23T16:02:27.934Z"}],"details":{"listingId":"dfc64b20-5754-4737-bfa4-c0b76705e8cb","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/168 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/168"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/168"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 protocol payments","Agents needing keyless pay-per-request API access","Users who want to avoid subscriptions and pay only per call"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.17Z"},"updatedAt":"2026-04-23T16:02:27.934Z"}}