{"id":"c7c14041-e4eb-4cf2-afb3-bf9cff525852","shortId":"2MvSJU","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request at $0.02 using USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled via the x402 protocol: callers include an X-PAYMENT header to settle each request on-chain.\n\nThe specific endpoint at `/api/v1/transactions/150` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e. $0.02) on Base. The platform advertises 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).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The exact functionality of the `/api/v1/transactions/150` endpoint specifically is unclear; the path suggests a transaction lookup by ID but this is not confirmed by any documentation.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API","serverless API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific function of /api/v1/transactions/150 is unclear — the path suggests a transaction lookup but this is unconfirmed","No request body schema or response schema is documented anywhere","The breadth of advertised endpoints (AI, finance, analytics, utilities) is unusual for a single platform at uniform $0.02 pricing — actual functionality is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/150","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/transactions/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/transactions/150 is ambiguous. This is effectively a stub 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'/api/v1/transactions/150':110,219 '/docs':180 '/pricing':182 '/readme':184 '/request':13,30 '0.02':12,29,68,131,134 '000':126 '20':125 '402':120 'Base network API' 'USDC API' 'access':116 'advertis':139 'ai':149 'ai-inference' 'ai/ml':53 'analysi':153 'analyt':52,143 'api':5,15,22,32,41,77,115 'avail':210 'base':8,25,73,127,136 'broad':46 'call':4,21 'caller':92 'categori':140 'chain':105 'challeng':121 'classif':156 'classification' 'collect':47 'commit':83 'confirm':236 'connect':190 'content':196 'convers':173 'crawl':213 'crypto-paid API' 'crypto-quotes' 'data':51,56,142,146 'data-analytics' 'document':175,205,239 'embed':157 'embeddings' 'enabl':40 'endpoint':49,61,108,220 'estim':167 'exact':215 'exampl':209 'exchang':162 'export':147 'extrem':177 'feed':161 'financ':158 'finance-data' 'finance/web3':55 'function':216 'gas':166 'generat':174 'geocod':171 'geocoding' 'handl':87 'header':98 'i.e':133 'id':231 'includ':93,141 'infer':54 'infrastructur':169 'insight':148 'key':16,33,78 'learn':151 'limit':80 'list':112 'lookup':229 'low fee API' 'lowpaymentfee.com':35 'machin':150 'metric':144 'micropayment API' 'network':9,26,74 'no-api-key' 'offer':44 'on-chain':103 'openapi':200 'page':185 'paid':63 'path':225 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':85,97 'per':3,20,65 'per-request':64 'per-request-billing' 'platform':6,23,42,138 'premium':114 'price':160 'prompt':192 'protocol':91 'quot':165 'rate':79,163 'render':187 'report':145 'request':66,102,122 'request/response':203 'requir':17,34,84 'return':118 'schema':204 'sentiment':152 'sentiment-analysis' 'serverless API' 'servic':59 'settl':100 'span':50 'spars':178 'spec':201 'specif':107,221 'suggest':226 'summar':155 'text':154 'text-summarization' 'token':164 'transact':228 'unclear':223 'unit':128 'upfront':82 'usag':208 'usdc':70,130,132 'usdc-base-network' 'use':69 'util':58,170 'utility-services' 'valid':172 'via':10,27,88 'wallet':191 'web3':159 'x':96 'x-payment':95 'x402':11,28,39,90 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"fea56ee1-e17c-410d-99d1-e092ac5bedca","listingId":"c7c14041-e4eb-4cf2-afb3-bf9cff525852","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/transactions/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:46.698Z"}],"sources":[{"listingId":"c7c14041-e4eb-4cf2-afb3-bf9cff525852","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:46.698Z","lastSeenAt":"2026-04-22T13:31:45.792Z"}],"details":{"listingId":"c7c14041-e4eb-4cf2-afb3-bf9cff525852","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/150 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment via USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/150"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with pay-as-you-go pricing","Geocoding, validation, and conversion utilities paid per request via x402"],"bestFor":["Developers who want instant API access without signup or API key provisioning","Agent-based workflows that can settle payments on Base via x402","Low-volume or bursty usage patterns where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Teams without a Base-compatible USDC wallet for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.111Z"},"updatedAt":"2026-04-22T13:31:45.792Z"}}