{"id":"a4bcc8ba-3432-4522-a4b6-21bd2e03fd11","shortId":"LLUUZT","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/176` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header to each request.\n\nThe wider platform advertises four endpoint families: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint probed here (`/api/v1/inbox/176`) does not clearly map to any of those named categories, and no documentation, OpenAPI spec, or response schema was found for it.\n\nPayments are settled on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies version 1, scheme \"exact\", and a 300-second payment timeout. The endpoint is live and returns a proper 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint or any endpoint on the platform","The specific path /api/v1/inbox/176 does not correspond to any named endpoint in the site's catalog — its actual functionality is unknown","No example responses or error codes documented anywhere","The /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/176","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/inbox/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no OpenAPI spec, no documentation, no response schema, and no explanation of what /api/v1/inbox/176 actually does. The 'Premium API Access' label is generic and uninformative. The broader site lists many endpoints but provides no docs for any of them. This is effectively a stub 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'/request':19,38,169 '0.02':18,37,95,168 '000':89 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':207 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':210 '1':216 '20':88 '300':221 '402':233 '6':101 'Base network API' 'USDC micropayment API' 'accept':77 'access':75 'address':206 'advertis':110,125 'ai':12,31,136 'analysi':140 'analyt':130 'api':5,24,45,74,104 'attach':113 'base':8,27,63,90,204 'broad':50 'call':4,23,97 'caller':111 'catalog':51 'categori':187 'challeng':84,213,234 'classif':143 'clear':180 'convers':160 'crypto-paid API' 'data':11,30,129,133 'decim':102 'document':190 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,164,174,226 'estim':154 'exact':218 'exchang':149 'export':134 'expos':48 'famili':128 'feed':148 'financ':13,32,145 'found':197 'four':126 'gas':153 'generat':161 'geocod':158 'header':118 'howev':171 'i.e':94 'infrastructur':156 'insight':135 'json-response' 'key':105 'learn':138 'limit':108 'list':71,163 'live':228 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':137 'map':181 'metric':131 'name':186 'network':64 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':191 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':83,117,200,223 'per':3,22,55,96 'platform':6,25,46,124 'post':78 'post-endpoint' 'premium':73 'premium API access' 'price':147,170 'probe':175 'proper':232 'quot':152 'rate':107,150 'report':132 'request':56,79,121 'requir':85 'respons':194 'return':230 'schema':195 'scheme':217 'second':222 'sentiment':139 'settl':58,202 'share':165 'simpli':112 'sinc':98 'spec':192 'specif':66,173 'specifi':214 'summar':142 'text':141 'timeout':224 'token':151 'unit':91 'usdc':9,28,60,93,99,209 'usdc-base' 'use':100,208 'util':15,34,157 'valid':159 'version':215 'web3':146 'wider':123 'x':116 'x-payment':115 'x402':43,82,212 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"564aad9f-cb5a-40e7-84b8-6d6ffd7c90da","listingId":"a4bcc8ba-3432-4522-a4b6-21bd2e03fd11","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/inbox/176","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.718Z"}],"sources":[{"listingId":"a4bcc8ba-3432-4522-a4b6-21bd2e03fd11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/176","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.718Z","lastSeenAt":"2026-04-22T04:02:33.341Z"}],"details":{"listingId":"a4bcc8ba-3432-4522-a4b6-21bd2e03fd11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/176 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/176","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/176"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/176"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises four endpoint families: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Integrating pay-as-you-go API calls without subscription commitments"],"bestFor":["Developers or agents who want zero-signup, pay-per-use API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping or low-volume use cases where $0.02/call is cost-effective"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where per-call crypto settlement adds overhead","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.615Z"},"updatedAt":"2026-04-22T04:02:33.341Z"}}