{"id":"f52a5234-94e1-4543-8a2b-90bfa8faba23","shortId":"T3S4uJ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/255` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid individually via the X-PAYMENT header.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: 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.\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 schema, no request/response examples, and no detailed description of what the `/api/v1/charges/255` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides versus the other named endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/charges/255' ('Premium API Access') is not explained anywhere — it is unclear what data or service it provides","No request or response examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/255","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/charges/255","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. It is unclear what 'Premium API Access' actually returns, making this effectively a stub 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'0.02':12,28,89,165 '000':84 '0x8335':74 '20':83 '2913':75 '402':216 '6':94 'Base network API' 'USDC micropayment API' 'accept':65 'access':7,23,44,63,230 'across':123 'actual':207 'advertis':121 'ai':133 'amount':81 'analysi':137 'analyt':127 'api':6,22,42,62,97,174,229 'base':9,25,52,77,85 'base-network' 'broader':118 'call':4,20,91 'categori':125 'challeng':217 'classif':140 'commit':103 'connect':183 'content':189 'contract':73 'convers':157 'crypto-paid API' 'data':126,130,225 'decim':95 'descript':201 'detail':200 'doc':173 'document':168,220 'embed':141 'endpoint':43,56,122,161,206,210,236 'equal':88 'estim':151 'exampl':197 'exchang':146 'export':131 'extrem':170 'feed':145 'financ':142 'four':124 'function':227 'gas':150 'generat':158 'geocod':155 'header':116 'individu':110 'infrastructur':153 'insight':132 'key':98 'label':60 'learn':135 'limit':100 'list':160 'live':212 'lowpaymentfee' 'lowpaymentfee.com':33,119 'machin':134 'maximum':80 'metric':128 'name':235 'network':53 'no-api-key' 'offer':34 'openapi':193 'page':178 'paid':109 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payment':48,68,115 'per':3,13,19,29,40,90,166 'platform':120 'post':66 'post-method' 'premium':5,21,61,228 'premium API access' 'price':144,163,175 'prompt':185 'protocol':49 'provid':231 'quot':149 'rate':99,147 'readm':177 'render':180 'report':129 'request':14,30,41,67,107,167 'request/response':196 'requir':105 'return':208,213 'schema':194 'sentiment':136 'settl':70 'spars':171 'specif':55 'suit':36 'summar':139 'text':138 'token':148 'unclear':223 'unit':86 'upfront':102 'usdc':16,32,72,92 'usdc-settlement' 'use':93 'util':154 'valid':156,215 'versus':232 'via':10,26,45,111 'wallet':184 'web3':143 'without':219 'x':114 'x-payment':113 'x402':11,27,47 'x402 API' 'x402-payment'","prices":[{"id":"fe869608-b680-44cf-8f29-ba7d1d636bee","listingId":"f52a5234-94e1-4543-8a2b-90bfa8faba23","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/charges/255","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:44.095Z"}],"sources":[{"listingId":"f52a5234-94e1-4543-8a2b-90bfa8faba23","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/255","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:44.095Z","lastSeenAt":"2026-04-24T02:32:12.603Z"}],"details":{"listingId":"f52a5234-94e1-4543-8a2b-90bfa8faba23","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/255 \\\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 402 with x402 challenge accepting USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/255"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/255"}],"useCases":["Accessing premium data or services without API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.585Z"},"updatedAt":"2026-04-24T02:32:12.603Z"}}