{"id":"bd0ad6af-9707-4a0d-952c-9ccd9bf2a411","shortId":"wsJshy","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 provider, which spans categories including 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 minimum commitments required.\n\nThe specific endpoint `/api/v1/payments/21` is listed under the title \"Premium API Access\" but the crawled site does not describe what this particular endpoint returns or what input it expects. The x402 challenge confirms it is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (0.02 USD) per call on Base. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\n\nThe provider's landing page lists 16 endpoints across four categories but documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no examples available. Because of this, the actual functionality behind this specific endpoint remains unclear — the name \"Premium API Access\" is generic and could be a meta/billing endpoint or a placeholder.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["payments","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium access endpoint","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The endpoint name 'Premium API Access' is generic; actual functionality is unknown","No examples or sample responses available from the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/21","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/21","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 OpenAPI spec, no request/response schema, and no description of what this specific endpoint actually does. The docs, pricing, API, and README pages all render only 'Connect wallet' with no content. This is effectively a stub 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'/api/v1/payments/21':98 '/docs':176 '/pricing':177 '/readme':179 '/request':13,28 '0.02':12,27,73,145 '000':140 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':161 '16':168 '20':139 'Base network API' 'USDC micropayment endpoint' 'accept':131 'access':7,22,38,106,220 'across':170 'actual':208 'address':155 'ai':60 'analyt':59 'api':6,21,37,85,105,219 'avail':203 'base':9,24,81,141,150 'base-network' 'behind':210 'call':4,19,148 'categori':56,172 'challeng':126 'charg':135 'commit':93 'confirm':127 'connect':184 'contract':160 'could':224 'crawl':109 'crypto-paid API' 'data':58 'describ':113 'detail':191 'document':174 'endpoint':32,49,69,97,117,169,213,228 'exampl':202 'expect':123 'financ':63 'four':171 'function':209 'generic':222 'includ':57 'infrastructur':66 'input':121 'key':86 'land':165 'learn':62 'limit':89 'list':100,167 'live':130 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'made':153 'mani':48 'maximum':137 'meta/billing':227 'minimum':92 'name':217 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':195 'page':166,175 'particular':116 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,151 'per':3,18,74,147 'placehold':231 'post':132 'post-method' 'premium':5,20,36,104,218 'premium access endpoint' 'price':71 'prompt':186 'protocol':43 'provid':35,53,163 'rate':88 'remain':214 'render':181 'request':75,133 'request/response':198 'requir':94 'return':118 'schema':199 'settl':76 'site':110 'span':55 'spec':196 'specif':96,212 'technic':190 'titl':103 'unclear':215 'unit':142 'usd':146 'usdc':15,30,78,144,159 'usdc-settlement' 'use':157 'util':67 'via':10,25,39 'wallet':185 'web3':64 'x402':11,26,41,125 'x402 API' 'x402-payment'","prices":[{"id":"2a6a70b1-f399-424f-ae9b-95da34c17164","listingId":"bd0ad6af-9707-4a0d-952c-9ccd9bf2a411","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:51.064Z"}],"sources":[{"listingId":"bd0ad6af-9707-4a0d-952c-9ccd9bf2a411","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:51.064Z","lastSeenAt":"2026-04-24T04:03:49.024Z"}],"details":{"listingId":"bd0ad6af-9707-4a0d-952c-9ccd9bf2a411","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/21 \\\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":"All endpoints 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":"x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/21"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/21"},{"claim":"Provider lists 16 endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated service calls settled in USDC on Base","Programmatic access to premium features with per-request billing"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","Applications requiring free or high-volume batch access at discounted rates"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.712Z"},"updatedAt":"2026-04-24T04:03:49.024Z"}}