{"id":"84bf2cf9-da81-44a4-8ec0-044f725cb37a","shortId":"hwNagC","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 accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/303` 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 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.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality behind the `/api/v1/charges/303` \"Premium API Access\" endpoint is unclear and may be a generic or demonstration endpoint rather than a distinct service.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limits","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/charges/303 ('Premium API Access') is not explained anywhere","No request body schema or response examples are available","Cannot verify what data or service this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/303","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/303","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 spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of the /api/v1/charges/303 endpoint is undocumented. This is effectively a stub 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'/api/v1/charges/303':56,215 '/docs':174 '/pricing':175 '/readme':178 '/request':13,28,167 '0.02':12,27,87,166 '000':82 '0x8335':72 '20':81 '2913':73 '6':92 'Base network API' 'USDC API access' 'accept':63 'access':7,22,42,61,218 'across':124 'advertis':122 'ai':134 'amount':79 'analysi':138 'analyt':128 'api':6,21,40,60,95,217 'attach':106 'avail':205 'base':9,24,50,75,83 'base-network' 'behind':213 'broader':119 'call':4,19 'caller':104 'categori':126 'classif':141 'collect':34 'commit':101 'connect':184 'content':209 'contract':71 'convers':158 'crawl':208 'data':127,131 'decim':93 'demonstr':228 'detail':191 'distinct':233 'document':169,200 'embed':142 'endpoint':41,54,123,162,219,229 'equal':86 'estim':152 'exampl':204 'exchang':147 'export':132 'extrem':171 'feed':146 'financ':143 'four':125 'function':212 'gas':151 'generat':159 'generic':226 'geocod':156 'header':111 'host':32 'infrastructur':154 'insight':133 'json-response' 'key':96 'label':58 'learn':136 'limit':98 'list':161 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'maximum':78 'may':223 'metric':129 'micropayment API' 'network':51 'no-api-key' 'no-rate-limits' 'openapi':195 'page':179 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66,110,116 'per':3,18,38,88 'platform':121 'post':64 'premium':5,20,59,216 'premium API' 'price':145,168 'prompt':186 'proof':117 'protocol':47 'quot':150 'rate':97,148 'rather':230 'render':181 'report':130 'request':39,65,89 'request/response':198 'requir':103 'schema':199 'sentiment':137 'servic':234 'settl':68 'share':163 'simpli':105 'spars':172 'spec':196 'specif':53,211 'summar':140 'technic':190 'text':139 'token':149 'unclear':221 'unit':84 'upfront':100 'usag':203 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25,43 'wallet':185 'web3':144 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"d3ed8f69-64be-44c5-8e75-921377144afc","listingId":"84bf2cf9-da81-44a4-8ec0-044f725cb37a","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/303","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:55.642Z"}],"sources":[{"listingId":"84bf2cf9-da81-44a4-8ec0-044f725cb37a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/303","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:55.642Z","lastSeenAt":"2026-04-24T01:32:05.734Z"}],"details":{"listingId":"84bf2cf9-da81-44a4-8ec0-044f725cb37a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/303 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/303"},{"claim":"All 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"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/303"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, keyless API access"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up significantly","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.027Z"},"updatedAt":"2026-04-24T01:32:05.734Z"}}