{"id":"26c2cf77-58c1-43c6-b42f-c3bbee6c51e4","shortId":"mTqUA5","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: 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). All endpoints are priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/transactions/21` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-call with no API keys, no rate limits, and no minimum commitments required. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 describing what the `/api/v1/transactions/21` endpoint actually returns or what parameters it accepts. The platform's landing page lists many endpoints but provides no specifics about their inputs or outputs beyond category labels.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","validation","conversion"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API","on-demand API"],"warnings":["No documentation available — /docs, /pricing, /api, 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 specific purpose of /api/v1/transactions/21 is unclear; the landing page does not list this path among its catalog","No request or response examples available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/21","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/21","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 purpose of the specific /api/v1/transactions/21 endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/transactions/21':117,213 '/docs':181 '/pricing':182 '/readme':185 '/request':19,38 '0.02':18,37,99,143 '0x8335':137 '20000':132 '2913':138 '6':147 'Base network API' 'USDC API' 'accept':169,221 'access':123 'across':58 'actual':215 'advertis':128 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,122,157 'application/json':174 'base':8,27,107,133,140 'beyond':239 'broad':50 'call':4,23,154 'catalog':51 'categori':60,240 'challeng':127 'classif':75 'classification' 'commit':165 'connect':191 'content':197 'convers':92 'conversion' 'crypto payment API' 'data':11,30,61,65 'data-analytics' 'decim':148 'describ':210 'detail':208 'document':176,209 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,168,214,229 'equal':142 'estim':86 'exampl':205 'exchang':81 'export':66 'extrem':178 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'gas':85 'generat':93 'geocod':90 'geocoding' 'given':144 'infrastructur':88 'input':236 'insight':67 'key':158 'label':241 'land':225 'learn':70 'limit':161 'list':119,227 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':151 'mani':228 'maxamountrequir':130 'metric':63 'micropayment API' 'minimum':164 'network':108 'offer':48 'on-demand API' 'openapi':201 'output':238 'page':186,226 'paid':102 'paramet':219 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':149 'per':3,22,55,100,153 'per-cal':152 'platform':6,25,46,223 'post':170 'premium':121 'price':79,97 'prompt':193 'protocol':112 'provid':231 'quot':84 'rate':82,160 'render':188 'report':64 'request':56,101,171 'request/response':204 'requir':166 'respons':175 'return':173,216 'schema':202 'sentiment':71 'sentiment-analysis' 'spars':179 'specif':114,233 'summar':74 'text':73 'text-summarization' 'token':83 'unit':134 'usdc':104,136,145 'usdc-base' 'util':15,34,89 'valid':91 'validation' 'via':9,28,109 'wallet':192 'web3':78 'x402':10,29,43,111,126 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"18a86fa4-c77d-4fd2-9476-633c2e74c538","listingId":"26c2cf77-58c1-43c6-b42f-c3bbee6c51e4","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:12.069Z"}],"sources":[{"listingId":"26c2cf77-58c1-43c6-b42f-c3bbee6c51e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:12.069Z","lastSeenAt":"2026-04-22T21:31:37.675Z"}],"details":{"listingId":"26c2cf77-58c1-43c6-b42f-c3bbee6c51e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/21 \\\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 this endpoint advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/21"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto micropayments","Integrating pay-as-you-go data analytics and reporting into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring small, infrequent API calls where subscriptions are overkill","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.932Z"},"updatedAt":"2026-04-22T21:31:37.675Z"}}