{"id":"a6b85e6a-7c3a-47d7-be4d-ce9b60c9ac69","shortId":"Gn2Z4r","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/69` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 endpoints are priced at $0.02 per request and settle in USDC on Base.\n\nHowever, the specific functionality of the `/api/v1/payments/69` endpoint is unclear. The description simply says \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example requests or responses, and no indication of what input parameters are expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/payments/69 is undocumented — it is unclear what data or service this endpoint provides.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.","No OpenAPI schema, no example requests, and no example responses are available.","The endpoint path '/payments/69' suggests a test or placeholder resource rather than a production API."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/69","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/payments/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is essentially no documentation about what the endpoint actually does. No OpenAPI schema, no example requests/responses, no description beyond the generic 'Premium API Access' label. The docs pages are empty (just 'Connect wallet'). This is effectively a stub 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'/request':13,30 '0.02':12,29,69,147 '000':73 '20':72 '6':79 'Base network API' 'USDC API access' 'accept':50 'access':66,172 'addit':199 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,15,22,32,42,65,82,106,171,188 'attach':93 'base':8,25,55,74,155 'broader':102 'call':4,21,71 'caller':91 'categori':107 'classif':123 'commit':88 'connect':194 'convers':140 'cost':68 'data':109,113,179 'decim':80 'descript':167 'detail':201 'doc':185 'document':176 'embed':124 'endpoint':59,143,163 'estim':134 'exampl':208 'exchang':129 'expect':220 'export':114 'feed':128 'financ':125 'function':159 'gas':133 'generat':141 'geocod':138 'header':97 'howev':156 'includ':108 'indic':214 'infrastructur':136 'input':217 'insight':115 'json-response' 'key':16,33,83 'learn':118 'like':227 'limit':85 'list':62 'look':226 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':117 'metric':111 'micropayment API' 'multipl':105 'network':56 'no-api-key' 'openapi':205 'page':189 'paramet':218 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payload':225 'payment':52,96 'per':3,20,40,70,148 'platform':6,23,43,103 'premium':64,170 'price':127,145,186 'prompt':196 'protocol':48 'quot':132 'rate':84,130 'render':191 'report':112 'request':41,100,149,209 'requir':17,34,90 'respons':211,224 'return':183 'say':169 'schema':206 'sentiment':119 'servic':181 'settl':151 'simpli':92,168 'specif':58,158 'summar':122 'technic':200 'text':121 'token':131 'unclear':165 'unit':75 'upfront':87 'usdc':9,26,51,77,153 'usdc-base' 'use':45 'util':137 'valid':139 'via':10,27 'wallet':195 'web3':126 'x402':11,28,47,95 'x402 API' 'x402-payment'","prices":[{"id":"043d9911-69ef-4d30-8eeb-b9ed3ffdc404","listingId":"a6b85e6a-7c3a-47d7-be4d-ce9b60c9ac69","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/payments/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:58.098Z"}],"sources":[{"listingId":"a6b85e6a-7c3a-47d7-be4d-ce9b60c9ac69","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:58.098Z","lastSeenAt":"2026-04-23T19:01:22.910Z"}],"details":{"listingId":"a6b85e6a-7c3a-47d7-be4d-ce9b60c9ac69","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/69 \\\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 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/69"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/69"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go 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 consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.549Z"},"updatedAt":"2026-04-23T19:01:22.910Z"}}