{"id":"6fc2dec1-6458-42cd-94f3-b9757bfe398a","shortId":"aYJcAg","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 API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/generate/resource/99` is labeled \"Premium API Access\" and accepts POST requests. Payment is handled inline: callers attach an X-PAYMENT header with a signed USDC payment on Base, and the server fulfills the request once payment is verified. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe provider's landing page lists four categories of endpoints: 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. The site advertises no API keys, no rate limits, and instant access.\n\nDocumentation is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind the `/api/v1/generate/resource/99` path is unclear; the name \"Premium API Access\" and the path segment \"generate\" suggest some form of content or resource generation, but specifics are not documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["infrastructure","api-gateway"],"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.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The exact purpose of /api/v1/generate/resource/99 ('Premium API Access') is not explained anywhere; functionality must be discovered by trial.","The broader site lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/99","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/generate/resource/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint is undocumented, making it effectively a stub 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'/api/v1/generate/resource/99':57,218 '/docs':181 '/pricing':183 '/readme':185 '/request':13,28 '0.02':12,27,112,161 '000':103 '20':102 '6':108 'Base network API' 'USDC micropayment API' 'accept':64 'access':7,22,62,175,226 'advertis':98,166 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,61,168,225 'attach':72 'base':9,24,49,84,104 'base-network' 'behind':216 'call':4,19 'caller':71 'categori':122 'challeng':97 'classif':139 'connect':191 'content':197,236 'convers':155 'crypto-paid API' 'data':125,129 'decim':109 'detail':208 'document':176,209,244 'embed':140 'endpoint':41,55,124,212 'equal':111 'estim':150 'exact':214 'exampl':205 'exchang':145 'export':130 'extrem':178 'feed':144 'financ':141 'form':234 'four':121 'fulfil':88 'function':215 'gas':149 'generat':156,231,239 'geocod':153 'handl':69 'header':77 'infrastructur':152 'inlin':70 'insight':131 'instant':174 'key':169 'label':59 'land':118 'learn':134 'limit':172 'list':120 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':133 'maxamountrequir':100 'metric':127 'name':223 'network':50 'no-api-key' 'offer':32 'openapi':201 'page':119,186 'path':219,229 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':67,76,82,92 'per':3,18,38,113,162 'post':65 'post-endpoint' 'premium':5,20,60,224 'premium API access' 'price':143,159 'prompt':193 'protocol':46 'provid':116 'quot':148 'rate':146,171 'render':188 'report':128 'request':39,66,90,114,163 'request/response':204 'resourc':238 'schema':202 'segment':230 'sentiment':135 'server':87 'settl':42 'sign':80 'site':165 'specif':54,241 'suggest':232 'suit':34 'summar':138 'text':137 'thin':179 'token':147 'unclear':221 'unit':105 'usdc':15,30,52,81,107 'usdc-settlement' 'use':51 'valid':154 'verifi':94 'via':10,25,43 'wallet':192 'web3':142 'x':75 'x-payment':74 'x402':11,26,45,96 'x402 API' 'x402-payment'","prices":[{"id":"e237bc4b-6edb-4a69-bf97-562b763567b9","listingId":"6fc2dec1-6458-42cd-94f3-b9757bfe398a","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/generate/resource/99","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:28.195Z"}],"sources":[{"listingId":"6fc2dec1-6458-42cd-94f3-b9757bfe398a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/99","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:28.195Z","lastSeenAt":"2026-04-24T10:32:11.054Z"}],"details":{"listingId":"6fc2dec1-6458-42cd-94f3-b9757bfe398a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/99 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/99"},{"claim":"All 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 site lists four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Paying per call for utility or generation endpoints using USDC on Base","Integrating x402-compatible payment flows into automated workflows"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-native agent wallets on the Base network","Low-cost micropayment use cases at $0.02 per request"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume batch workloads where per-request pricing may add up without volume discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.826Z"},"updatedAt":"2026-04-24T10:32:11.054Z"}}