{"id":"b0b6d558-a601-460f-8053-813a319acd28","shortId":"vqf9Lu","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","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 general-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/400` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are provided. Because of this, the actual behavior and output format of each endpoint is unknown and must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found; request and response formats are unknown","The specific endpoint /api/v1/transactions/400 has a generic 'Premium API Access' description with no detail on what it does","Cannot verify actual functionality of any listed endpoint beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/400","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/400","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 network. However, documentation is effectively nonexistent — every doc/pricing/readme page shows only 'Connect wallet'. No OpenAPI spec, no request/response schemas, and no examples are available, making it impossible to know what the endpoint actually 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'/api/v1/transactions/400':107 '/docs':171 '/pricing':172 '/readme':175 '/request':18,36 '0.02':17,35,69,129,163 '000':123 '20':122 '402':117 '402 payment api' 'access':113 'actual':203 'advertis':135 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':134 'analysi':140 'analyt':11,29,54 'api':5,23,43,82,112 'attach':95 'base':8,26,77,124,131 'base network api' 'behavior':204 'broad':48 'call':4,22 'caller':93 'challeng':118 'classif':143 'collect':49 'connect':181 'convers':155 'conversion' 'cover':10,28 'crypto-gas' 'data':53,58,157 'data-analytics' 'detail':188 'discov':216 'document':166 'embed':144 'enabl':42 'endpoint':51,65,105,137,210 'estim':152 'everi':64 'exampl':196 'exchang':147 'exchange-rates' 'experiment':217 'extrem':168 'feed':146 'financ':13,31 'finance-prices' 'finance/web3':57 'format':207 'gas':151 'general':61 'general-purpos':60 'generat':158 'geocod':153 'geocoding' 'header':99 'i.e':128 'infer':56 'key':83 'limit':86 'list':109 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'must':214 'network':78 'offer':46 'openapi':190 'output':206 'page':176 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':98 'per':3,21,70 'platform':44,133 'point':165 'premium':111 'price':67,145,164 'prompt':183 'provid':198 'purpos':62 'quot':150 'rate':85,148 'render':178 'request':71,102,119 'request/response':192 'requir':92 'return':115 'schema':193 'sentiment':139 'settl':72 'sibl':136 'sign':90 'sign-up':89 'simpli':94 'span':52 'spars':169 'spec':191 'specif':104 'suit':6,24 'summar':142 'technic':187 'text':141 'token':149 'unit':125 'unknown':212 'usag':195 'usdc':9,27,74,127 'usdc api' 'usdc-base' 'util':15,33,63 'valid':154 'validation' 'wallet':182 'x402':41,97 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"9643be5b-8f48-4e47-9c9d-4e9574dda792","listingId":"b0b6d558-a601-460f-8053-813a319acd28","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/400","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:46.615Z"}],"sources":[{"listingId":"b0b6d558-a601-460f-8053-813a319acd28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/400","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:46.615Z","lastSeenAt":"2026-04-22T10:32:23.538Z"}],"details":{"listingId":"b0b6d558-a601-460f-8053-813a319acd28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/400 \\\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 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 402 challenge for /api/v1/transactions/400 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/400"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running lightweight AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Geocoding, data validation, or format conversion as utility microservices","Exporting analytics metrics and reports with no subscription commitment"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing SLAs, documentation, or guaranteed uptime","Users who need detailed API documentation or response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.048Z"},"updatedAt":"2026-04-22T10:32:23.538Z"}}