{"id":"c68deb92-730f-4df7-8dce-3ca6a43b2587","shortId":"B3M6gz","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 infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a signed USDC payment in the X-PAYMENT header and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transfers/134` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely thin; 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.","tags":[],"capabilities":["x402-payment","usdc-base-network","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","no-auth api"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The endpoint path /api/v1/transfers/134 is not listed among the site's advertised APIs — its specific function is unknown","No examples of request bodies or response formats are documented anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/134","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/transfers/134","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 spec, no request/response schema, no documentation beyond a landing page, and no examples. The specific purpose of '/api/v1/transfers/134' labeled 'Premium API Access' is unclear — it does not appear in the site's listed catalog. Effectively a stub 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'/request':13,28 '0.02':12,27,59,137,184 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':132 '20':125 '300':152 '6':141 'accept':115 'access':113 'address':148 'advertis':121,158 'ai-inference' 'ai/ml':49 'analysi':162 'analyt':48 'api':5,20,37,71,112,198 'asset':131 'attach':87 'avail':228 'base':8,23,67,127,134 'base network api' 'beyond':189 'broad':42 'broader':156 'call':4,19 'caller':86 'catalog':43 'challeng':120 'classif':165 'classification' 'commit':78 'connect':207 'content':232 'convers':177 'cost':58 'crawl':231 'crypto-data' 'data':47,52 'data-analytics' 'decim':142 'detail':214 'doc':197 'document':188,223 'embed':166 'embeddings' 'enabl':36 'endpoint':45,57,105,159 'equal':136 'estim':174 'everi':56 'exampl':227 'exchang':169 'extrem':194 'feed':168 'finance-data' 'finance/web3':51 'gas':173 'generat':179 'geocod':175 'geocoding' 'given':138 'handl':83 'header':97 'howev':187 'immedi':102 'infer':50 'infrastructur':54 'inlin':85 'key':72 'land':191 'limit':75 'list':109 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':123 'micropayment api' 'network':9,24,68 'no-auth api' 'offer':40 'openapi':218 'page':192,202 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,91,96,144 'per':3,18,60 'platform':6,21,38,157 'point':186 'post':116 'premium':111 'price':167,185,199 'prompt':209 'protocol':82 'quot':172 'rate':74,170 'readm':201 'receiv':99 'render':204 'request':61,117 'request/response':221 'requir':79 'respons':101 'schema':222 'second':153 'sent':146 'sentiment':161 'sentiment-analysis' 'sign':89 'span':46 'spec':219 'specif':104 'summar':164 'technic':213 'text':163 'text-summarization' 'thin':195 'timeout':154 'token':171 'unit':128 'usag':226 'usdc':15,30,64,90,130,139 'usdc api' 'usdc-base-network' 'util':55 'utility-services' 'valid':176 'via':10,25 'wallet':208 'x':95 'x-payment':94 'x402':11,26,35,81,119 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c8a7a0e9-32b3-4d17-a0f6-1e6cd0e6904f","listingId":"c68deb92-730f-4df7-8dce-3ca6a43b2587","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/transfers/134","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:36.802Z"}],"sources":[{"listingId":"c68deb92-730f-4df7-8dce-3ca6a43b2587","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/134","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:36.802Z","lastSeenAt":"2026-04-22T15:02:24.360Z"}],"details":{"listingId":"c68deb92-730f-4df7-8dce-3ca6a43b2587","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/134 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $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 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/134"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid per request in USDC"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing SLA guarantees or documented rate limits","Users who need detailed API documentation, request/response schemas, or error handling guides"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.57Z"},"updatedAt":"2026-04-22T15:02:24.360Z"}}