{"id":"cec4c70a-9ddd-409e-9732-3bf690fd0fe3","shortId":"s89q5Z","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 hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/201` 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 with a valid x402 payment proof.\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 share the same $0.02/request pricing. However, the specific endpoint probed here (`/api/v1/charges/201`) does not clearly map to any of those named services — its description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"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, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The endpoint path '/api/v1/charges/201' does not match any of the named API endpoints listed on the homepage; its actual functionality is unknown.","No request or response schema is documented; callers cannot know what to send or expect back.","No OpenAPI or machine-readable spec is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/201","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/201","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 with a valid 402 x402 challenge, but there is zero documentation on what the endpoint actually does, what request body it expects, or what it returns. No OpenAPI spec, no examples, and the docs pages are empty. The listing is effectively a 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'/api/v1/charges/201':56,175 '/docs':209 '/pricing':211 '/readme':213 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '402':248 '6':92 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,61,192 'across':124 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95,191 'attach':106 'avail':239 'base':9,24,50,75,83 'base-network' 'bodi':259 'broader':119 'call':4,19 'caller':104 'categori':126 'challeng':250 'charg':79 'classif':141 'clear':178 'collect':34 'commit':101 'confirm':243 'connect':219 'content':225 'contract':71 'convers':158 'crypto-paid API' 'data':127,131,199 'decim':93 'descript':187 'document':196,204,234,253 'embed':142 'endpoint':41,54,123,162,172,241 'equal':86 'estim':152 'exampl':237 'exchang':147 'expect':266 'export':132 'extrem':206 'feed':146 'financ':143 'four':125 'function':201 'gas':151 'gate':42 'generat':159 'geocod':156 'header':111 'host':32 'howev':169 'infrastructur':154 'insight':133 'key':96 'label':58 'learn':136 'limit':98 'list':161 'live':244 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'map':179 'maximum':78 'metric':129 'name':184 'network':51 'no-api-key' 'openapi':229 'page':214 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':238 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'post-endpoint' 'premium':5,20,59,190 'premium API access' 'price':145,168 'probe':173 'prompt':221 'proof':117 'proper':247 'protocol':47 'quot':150 'rate':97,148 'render':216 'report':130 'request':39,65,89,258 'request/response':232 'requir':103 'respons':264 'return':203,245 'schema':233 'send':261 'sentiment':137 'servic':185 'settl':68 'share':163 'simpli':105,189 'spars':207 'spec':230 'specif':53,171 'substant':224 'summar':140 'text':139 'token':149 'unclear':256 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25 'wallet':220 'web3':144 'without':252 'x':109 'x-payment':108 'x402':11,26,45,115,249 'x402 API' 'x402-payment'","prices":[{"id":"e849d4c5-d37b-4a61-a730-24aabaff95b2","listingId":"cec4c70a-9ddd-409e-9732-3bf690fd0fe3","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/201","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:38.094Z"}],"sources":[{"listingId":"cec4c70a-9ddd-409e-9732-3bf690fd0fe3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/201","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:38.094Z","lastSeenAt":"2026-04-24T02:32:12.391Z"}],"details":{"listingId":"cec4c70a-9ddd-409e-9732-3bf690fd0fe3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/201 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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/201"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/201"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data or utility services"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Anyone needing detailed API documentation or guaranteed SLAs before integrating","Use cases requiring free or subscription-based pricing models","Developers unfamiliar with x402 payment protocol or crypto wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.834Z"},"updatedAt":"2026-04-24T02:32:12.391Z"}}