{"id":"f2af2bd1-7487-4b98-82ed-cf7432edde55","shortId":"kjvKhV","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, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/126` 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 documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.","The exact functionality of /api/v1/payments/126 ('Premium API Access') is undocumented; it is unclear what data or service it provides upon successful payment.","No OpenAPI spec or request/response schema is available.","No examples of successful responses exist in the crawl material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/126","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty. This is effectively a stub 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'/api/v1/payments/126':105 '/docs':202 '/pricing':204 '/readme':206 '/request':13,28 '0.02':12,27,81,146,194 '000':140 '20':139 '402':241 '6':150 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'actual':247 'ai':68 'analysi':172 'analyt':67 'api':6,21,37,64,93,109 'application/json':156 'avail':232 'base':9,24,89,141,153 'beyond':122 'call':4,19 'captur':243 'challeng':114,127,242 'charg':135 'classif':175 'collect':58 'commit':100 'confirm':128,239 'connect':212 'content':218 'convers':187 'crawl':235 'data':66,168 'decim':151 'document':121,197,227 'embed':176 'endpoint':32,49,77,104,164,237 'estim':184 'exact':117 'exampl':231 'exchang':179 'export':169 'extrem':199 'feed':178 'financ':71 'function':118 'gas':183 'generat':189 'geocod':185 'given':147 'host':56 'i.e':145 'infrastructur':74 'insight':170 'json-response' 'key':94 'label':107,124 'land':160 'learn':70 'limit':97 'list':162 'live':131,240 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'maximum':137 'metric':166 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':222 'page':161,207 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,251 'per':3,18,62,82 'platform':54,158 'point':196 'post':133 'post-method' 'premium':5,20,36,108 'price':79,177,195 'prompt':214 'protocol':43 'provid':35 'quot':182 'rate':96,180 'render':209 'report':167 'request':63,83,134 'request/response':225 'requir':101 'return':155,248 'schema':226 'sentiment':171 'settl':84 'sibl':163 'span':65 'spars':200 'spec':223 'specif':103 'success':250 'summar':174 'text':173 'token':181 'unit':142 'unknown':253 'upon':249 'usag':230 'usdc':15,30,86,144,148 'usdc-base' 'util':75 'valid':186 'via':10,25,39 'wallet':213 'web3':72 'x402':11,26,41,113,126 'x402 premium API' 'x402-payment'","prices":[{"id":"5e055f7e-66b3-472c-8224-8a43f5d42841","listingId":"f2af2bd1-7487-4b98-82ed-cf7432edde55","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:32.317Z"}],"sources":[{"listingId":"f2af2bd1-7487-4b98-82ed-cf7432edde55","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:32.317Z","lastSeenAt":"2026-04-23T17:31:47.634Z"}],"details":{"listingId":"f2af2bd1-7487-4b98-82ed-cf7432edde55","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment token.\n# Using curl (you need an x402-compatible client to generate the payment):\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/126 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/126"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the 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/126"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, on-demand API access settled in USDC","Low-commitment, no-subscription API consumption"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.572Z"},"updatedAt":"2026-04-23T17:31:47.634Z"}}