{"id":"a46ae6e5-0bcc-4464-826c-1d741ff83cc4","shortId":"gdcjrj","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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/claims/1` is labeled \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) per call.\n\nThe 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). Each of these is listed at the same $0.02 price point. Payment is settled on-chain via the x402 protocol using the exact payment scheme.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The actual functionality behind each endpoint cannot be independently verified from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["llm","finance","geo","data"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","low fee API","Base network API","crypto API payments","serverless API marketplace"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific functionality of /api/v1/claims/1 ('Premium API Access') is not described anywhere","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/1","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/claims/1","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 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' and the other listed endpoints cannot be 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'infrastructur':147 'insight':126 'key':74 'label':88 'learn':129 'limit':77 'list':157 'low fee API' 'lowpaymentfee.com':31 'machin':128 'materi':233 'metric':122 'network':9,24,70 'offer':40 'on-chain':167 'openapi':205 'page':189 'paid':64 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':164,177 'per':3,18,62,113 'platform':6,21,38,116 'point':163 'premium':89 'price':59,138,162,186 'prompt':196 'protocol':173 'quot':143 'rate':76,141 'readm':188 'render':191 'report':123 'request':63,97 'request/response':208 'return':93 'schema':209 'scheme':178 'sentiment':130 'serverless API marketplace' 'servic':55 'settl':166 'sinc':108 'span':46 'spars':182 'spec':206 'specif':83 'summar':133 'technic':200 'text':132 'token':142 'unit':103 'upfront':80 'usag':213 'usdc':15,30,66,105,109 'usdc-base-network' 'use':110,174 'util':54,148 'valid':150 'validation' 'verifi':229 'via':10,25,170 'wallet':195 'web3':137 'x402':11,26,35,95,172 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"5fe9781b-fc16-4ef1-8c8a-d01a7f8cfebc","listingId":"a46ae6e5-0bcc-4464-826c-1d741ff83cc4","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/claims/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:34.442Z"}],"sources":[{"listingId":"a46ae6e5-0bcc-4464-826c-1d741ff83cc4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:34.442Z","lastSeenAt":"2026-04-23T06:31:02.926Z"}],"details":{"listingId":"a46ae6e5-0bcc-4464-826c-1d741ff83cc4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/1 \\\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 are 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":"The x402 challenge for /api/v1/claims/1 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/1"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README 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 price feeds and gas estimates on a per-call basis","Running geocoding or data validation utilities with instant pay-per-use pricing","Exporting analytics data or generating reports via micropayment-gated endpoints"],"bestFor":["Developers who want zero-signup, pay-per-call API access","Agents and bots that can settle payments on Base via x402","Projects needing low-cost utility and AI endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput bulk access at volume-discounted pricing","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.11Z"},"updatedAt":"2026-04-23T06:31:02.926Z"}}