{"id":"149e6874-e2ec-45f9-8a04-a3ae0a1965ce","shortId":"gw6kVb","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":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/22` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header to each request.\n\nThe broader 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 share the same $0.02/request pricing.\n\nHowever, this specific endpoint (`/api/v1/charges/22`) has a generic \"Premium API Access\" description with no documentation on what data or functionality it actually returns. The docs, pricing, and README pages on the site all render only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, it is unclear what this particular endpoint does beyond accepting a paid POST request and returning JSON.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","payments"],"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, pricing, and README pages only show 'Connect wallet'","No OpenAPI or output schema describing what this endpoint actually returns","The endpoint name 'Premium API Access' is generic and does not describe its function","No request body schema or example responses are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/22","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint description is entirely generic. The site's docs/pricing/README pages are empty beyond a wallet-connect 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'/request':13,28,162 '0.02':12,27,86,161 '000':81 '0x8335':71 '20':80 '2913':72 '6':91 'Base network API' 'USDC micropayment API' 'accept':62,225 'access':7,22,41,60,174 'across':119 'actual':185 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':6,21,40,59,94,173 'attach':105 'base':9,24,49,74,82 'base-network' 'beyond':224 'broader':115 'call':4,19 'caller':103 'categori':121 'charg':78 'classif':136 'commit':100 'connect':200 'content':206 'contract':70 'convers':153 'crypto-paid API' 'data':122,126,181 'decim':92 'descript':175 'detail':214 'doc':188 'document':178,215 'embed':137 'endpoint':53,118,157,167,222 'equal':85 'estim':147 'exampl':212 'exchang':142 'export':127 'feed':141 'financ':138 'four':120 'function':183 'gas':146 'generat':154 'generic':171 'geocod':151 'header':110 'howev':164 'infrastructur':149 'insight':128 'json':232 'json-response' 'key':95 'label':57 'learn':131 'limit':97 'list':156 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':130 'maximum':77 'metric':124 'network':50 'no-api-key' 'offer':32 'openapi':209 'page':192 'paid':227 'particular':221 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':45,65,109 'per':3,18,38,87 'platform':116 'post':63,228 'premium':5,20,58,172 'premium API access' 'price':140,163,189 'prompt':202 'protocol':46 'quot':145 'rate':96,143 'readm':191 'render':197 'report':125 'request':39,64,88,113,229 'request/response':211 'requir':102 'return':186,231 'schema':210 'sentiment':132 'settl':67 'share':158 'simpli':104 'site':195 'specif':52,166 'substant':205 'suit':34 'summar':135 'text':134 'token':144 'unclear':218 'unit':83 'upfront':99 'usdc':15,30,69,89 'usdc-settlement' 'use':90 'util':150 'valid':152 'via':10,25,42 'wallet':201 'web3':139 'without':207 'x':108 'x-payment':107 'x402':11,26,44 'x402 API' 'x402-payment'","prices":[{"id":"409b3275-051f-4b3a-96eb-a51df8c91b5e","listingId":"149e6874-e2ec-45f9-8a04-a3ae0a1965ce","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:28.411Z"}],"sources":[{"listingId":"149e6874-e2ec-45f9-8a04-a3ae0a1965ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:28.411Z","lastSeenAt":"2026-04-24T04:03:33.220Z"}],"details":{"listingId":"149e6874-e2ec-45f9-8a04-a3ae0a1965ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/22 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/22"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/22"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need to pay per call using on-chain USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can autonomously pay for API calls via crypto","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where the actual response payload is undocumented","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.309Z"},"updatedAt":"2026-04-24T04:03:33.220Z"}}