{"id":"5ba1f5b7-052d-4e5d-819b-dad46a77e97c","shortId":"r8F5X3","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 site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/66` is described simply as \"Premium API Access\" and accepts HTTP POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals — consistent with the site's advertised pricing. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them. Without documentation it is unclear what specific functionality the `/api/v1/charges/66` path provides versus the other listed endpoints.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","no-api-key","no-rate-limit"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific function of /api/v1/charges/66 ('Premium API Access') is unclear and may be a generic or placeholder endpoint","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/66","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/66","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, and the landing page confirms pricing. However, there is zero documentation on what this specific endpoint does, no request/response schemas, no examples, and no OpenAPI spec. The docs/pricing/README pages are all empty beyond a wallet connect prompt. The listing is effectively a 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'/api/v1/charges/66':112,241 '/docs':175 '/pricing':176 '/readme':179 '/request':13,28 '0.02':12,27,88,144 '000':133 '0x8335':138 '20':132 '2913':139 '300':167 '6':148 'Base network API' 'USDC API access' 'accept':121 'access':7,22,38,119 'advertis':128,155 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,118 'base':9,24,96,134,141 'broad':48 'call':4,19 'catalog':49 'challeng':127 'classif':64 'commit':107 'connect':185 'consist':150 'content':191 'convers':81 'data':57 'decim':149 'describ':114 'detail':221 'document':170,200,233 'embed':65 'endpoint':32,84,111,208,217,248 'equal':143 'estim':75 'exact':163 'exampl':203 'exchang':70 'extrem':172 'feed':69 'financ':66 'format':227 'function':239 'gas':74 'generat':82 'geocod':79 'given':145 'host':46 'http':122 'http-post' 'infer':60 'infrastructur':77 'key':101 'land':213 'limit':104 'list':215,247 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':159 'mani':216 'maxamountrequir':130 'micropayment API' 'network':97 'no-api-key' 'no-rate-limit' 'openapi':195 'page':180,214 'paramet':224 'particular':207 'path':242 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payabl':91 'payment':42,157 'per':3,18,53,89 'post':123 'premium':5,20,36,117 'price':68,86,156 'prompt':187 'protocol':43 'provid':35,219,243 'quot':73 'rate':71,103 'render':182 'request':54,90,124,223 'request/response':198 'requir':108 'respons':226 'return':209 'schema':199 'scheme':164 'second':168 'sentiment':61 'simpli':115 'site':45,153,211 'span':56 'spars':173 'spec':196 'specif':110,238 'summar':63 'timeout':169 'token':72 'unclear':236 'unit':135 'usdc':15,30,93,137,146 'usdc-base' 'util':78 'valid':80 'versus':244 'via':10,25,39,160 'wallet':186 'web3':67 'without':232 'x402':11,26,41,126,162 'x402 premium API' 'x402-payment'","prices":[{"id":"1a6494ab-8cb2-4eaa-a895-0fde8b7d1e28","listingId":"5ba1f5b7-052d-4e5d-819b-dad46a77e97c","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:41.651Z"}],"sources":[{"listingId":"5ba1f5b7-052d-4e5d-819b-dad46a77e97c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:41.651Z","lastSeenAt":"2026-04-22T07:00:55.757Z"}],"details":{"listingId":"5ba1f5b7-052d-4e5d-819b-dad46a77e97c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/66 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/66"},{"claim":"Site lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.766Z"},"updatedAt":"2026-04-22T07:00:55.757Z"}}