{"id":"612baaa9-5d76-493b-9388-a1efecdb9080","shortId":"4rNkWJ","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 specific resource at `/api/v1/payments/398` accepts POST requests and charges 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a catalog of pay-per-call endpoints spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints are priced at $0.02 per request with no rate limits or minimum commitments.\n\nHowever, the specific functionality behind `/api/v1/payments/398` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail. It is unclear what data or service this particular endpoint returns when a valid payment is submitted.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-request API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment required"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/398 ('Premium API Access') is completely undocumented; it is unclear what data or service is returned upon payment.","No OpenAPI schema or request/response examples are provided.","The broader site lists many endpoints but none have documented schemas or sample payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/398","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/398","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually returns, no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/payments/398 is 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'/request':13,28 '0.02':12,27,68,145 '000':55 '0x8335':60 '20':54 '2913':61 '402 payment required' '6':73 'Base network API' 'USDC micropayment endpoint' 'accept':49 'access':7,22,38,169 'account':90 'advertis':96 'ai':113 'analysi':117 'analyt':107 'api':6,21,37,87,168,183 'base':9,24,56,64 'behind':159 'beyond':164 'broader':93 'call':4,19,103 'catalog':98 'charg':53 'classif':120 'commit':154 'connect':189 'convers':137 'crypto-paid API' 'data':106,110,200 'decim':74 'detail':195 'doc':180 'document':163 'embed':121 'endpoint':32,104,141,205 'equal':67 'estim':131 'exampl':177 'exchang':126 'export':111 'feed':125 'financ':122 'function':158 'gas':130 'generat':138 'geocod':135 'handl':77 'header':84 'howev':155 'infrastructur':133 'inlin':78 'insight':112 'key':88 'label':166 'learn':115 'limit':151 'list':140 'lowpaymentfee' 'lowpaymentfee.com':34,94 'machin':114 'metric':108 'minimum':153 'network':65 'no-api-key' 'openapi':173 'page':184 'particular':204 'pay':2,17,101 'pay-per-cal':1,16,100 'pay-per-call' 'pay-per-request API' 'payment':42,75,83,210 'per':3,18,69,102,146 'platform':95 'post':50 'post-endpoint' 'premium':5,20,36,167 'price':124,143,181 'prompt':191 'protocol':43 'provid':35 'quot':129 'rate':127,150 'render':186 'report':109 'request':51,70,147 'request/response':176 'requir':91 'resourc':46 'return':206 'schema':174 'sentiment':116 'servic':202 'span':105 'specif':45,157 'submit':212 'summar':119 'text':118 'token':128 'unclear':198 'unit':57 'usdc':15,30,59,71 'usdc-base' 'use':72 'util':134 'valid':136,209 'via':10,25,39,79 'wallet':190 'web3':123 'x':82 'x-payment':81 'x402':11,26,41 'x402 API' 'x402-payment'","prices":[{"id":"19fe7d9f-5a52-4b76-961f-56b9dc3320c4","listingId":"612baaa9-5d76-493b-9388-a1efecdb9080","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/398","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:42.271Z"}],"sources":[{"listingId":"612baaa9-5d76-493b-9388-a1efecdb9080","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/398","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:42.271Z","lastSeenAt":"2026-04-23T09:31:17.651Z"}],"details":{"listingId":"612baaa9-5d76-493b-9388-a1efecdb9080","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/398 \\\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":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/398"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/398"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base L2","Use cases requiring no-signup, no-rate-limit API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","Production workloads requiring well-documented request/response contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.311Z"},"updatedAt":"2026-04-23T09:31:17.651Z"}}