{"id":"cd12345b-bdd1-4cf0-bd2c-bb9fa2282db5","shortId":"h6yypX","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/transactions/185` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with a 300-second timeout. The broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities — all at the same $0.02 price point.\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 crawled pages. The exact functionality behind the `/api/v1/transactions/185` endpoint is unclear beyond its \"Premium API Access\" label. Prospective users should be aware that without documentation, the actual input parameters and response format for this and other endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/transactions/185 ('Premium API Access') is undocumented and unclear","The broad catalog of advertised endpoints (AI, finance, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/185","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/185","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, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc/pricing/readme pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific endpoint (/api/v1/transactions/185) is unclear beyond its generic 'Premium API Access' 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'/api/v1/transactions/185':93,213 '/docs':173 '/pricing':175 '/readme':177 '/request':13,28 '0.02':12,27,74,120,165 '000':109 '0x8335':114 '20':108 '2913':115 '300':131 '402':103 '402 payment api' 'access':99,221 'actual':232 'addit':138 'advertis':137 'ai-inference' 'ai/ml':49 'analysi':142 'analyt':48 'api':5,20,37,79,98,220 'avail':203 'awar':227 'base':8,23,67,110,117 'base network api' 'behind':211 'beyond':217 'broad':42 'broader':135 'call':4,19,76 'catalog':43 'challeng':104 'classif':145 'classification' 'commit':87 'connect':183 'content':189 'convers':157 'crawl':206 'crypto-data' 'data':47,52 'data-analytics' 'document':168,198,230 'embed':146 'embeddings' 'enabl':36 'endpoint':45,57,91,139,214,242 'equal':119 'estim':154 'exact':127,209 'exampl':202 'exchang':149 'extrem':170 'feed':148 'finance-data' 'finance/web3':51 'flat':71 'format':237 'function':210 'gas':153 'generat':159 'geocod':155 'geocoding' 'includ':140 'infer':50 'input':233 'key':80 'label':222 'limit':83 'list':95 'low payment fee' 'lowpaymentfee.com':31 'made':123 'micropayment api' 'minimum':86 'network':9,24,68 'offer':40 'openapi':193 'page':178,207 'paid':59 'paramet':234 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':121 'per':3,18,61,75 'per-request':60 'platform':6,21,38,136 'point':167 'premium':97,219 'price':147,166 'prompt':185 'prospect':223 'quot':152 'rate':72,82,150 'render':180 'request':62,105 'request/response':196 'requir':88 'respons':236 'return':101 'schema':197 'scheme':128 'second':132 'sentiment':141 'sentiment-analysis' 'servic':55 'span':46 'spars':171 'spec':194 'specif':90 'summar':144 'text':143 'text-summarization' 'timeout':133 'token':151 'unclear':216 'unit':111 'unknown':244 'usag':201 'usdc':15,30,64,113 'usdc api' 'usdc-base' 'use':63 'user':224 'util':54,160 'utility-services' 'valid':156 'via':10,25,124 'wallet':184 'without':229 'x402':11,26,35,126 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bbc05599-d5df-4585-a18f-c9f4058b79da","listingId":"cd12345b-bdd1-4cf0-bd2c-bb9fa2282db5","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/185","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:02.423Z"}],"sources":[{"listingId":"cd12345b-bdd1-4cf0-bd2c-bb9fa2282db5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/185","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:02.423Z","lastSeenAt":"2026-04-22T21:31:37.301Z"}],"details":{"listingId":"cd12345b-bdd1-4cf0-bd2c-bb9fa2282db5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/185 \\\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":"Flat pricing of $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 returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/185"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven pay-per-call access to AI inference endpoints (sentiment, summarization, classification, embeddings)","Fetching real-time crypto token quotes and gas estimates without API key management","On-demand geocoding and data conversion via micropayments","Accessing analytics metrics and reports with no subscription commitment"],"bestFor":["AI agents needing keyless, pay-per-request API access","Developers wanting low-friction USDC micropayment APIs on Base","Use cases requiring no rate limits and instant access without sign-up"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.376Z"},"updatedAt":"2026-04-22T21:31:37.301Z"}}