{"id":"5a623157-f96c-4453-98b1-e92188355a50","shortId":"Jba9bw","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/inbox/80` 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, which has 6 decimals), equating to $0.02 per call. 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, the exact functionality behind the `/api/v1/inbox/80` path is not documented beyond the generic \"Premium API Access\" label, so its specific input/output schema is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The exact purpose and input/output schema of /api/v1/inbox/80 are unknown — 'Premium API Access' is not descriptive","No OpenAPI spec, no detailed docs, and ancillary pages (/api, /pricing, /README) returned no useful content","The platform lists many endpoints on its homepage but none have documented schemas or example responses","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/80","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/inbox/80 is entirely undocumented — no input schema, no output schema, no examples, and no description beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':13,30 '0.02':12,29,63,131,174 '000':118 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':117 '300':142 '402 payment api' '6':127 'accept':107 'access':105,193 'address':138 'advertis':113,148 'ai/ml':53 'analysi':152 'analyt':52 'api':5,15,22,32,41,76,104,192 'asset':123 'attach':87 'base':8,25,71,119 'base network api' 'behind':181 'beyond':188 'broad':46 'broader':146 'call':4,21,133 'caller':85 'challeng':112 'classif':155 'commit':84 'convers':167 'cost':62 'data':51,56 'decim':128 'document':187 'embed':156 'enabl':40 'endpoint':49,61,97,149 'equat':129 'estim':164 'everi':60 'exact':179 'exchang':159 'feed':158 'finance/web3':55 'function':180 'gas':163 'generat':169 'generic':190 'geocod':165 'header':91 'howev':177 'infer':54 'input/output':198 'key':16,33,77 'label':194 'limit':80 'list':101 'low payment fee' 'lowpaymentfee.com':35 'maxamountrequir':115 'micropayment api' 'minimum':83 'network':72 'no-api-key' 'no-rate-limit' 'offer':44 'paid':66 'path':184 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'pay-per-request' 'payment':90,134 'per':3,20,64,132 'platform':6,23,42,147 'point':176 'post':108 'post-endpoint' 'premium':103,191 'price':157,175 'quot':162 'rate':79,160 'request':65,94,109 'requir':17,34 'schema':199 'second':143 'sent':136 'sentiment':151 'servic':59 'set':47 'simpli':86 'span':50 'specif':96,197 'summar':154 'text':153 'timeout':144 'token':161 'unit':120 'unknown':201 'usdc':9,26,68,122 'usdc api' 'usdc-base' 'util':58 'valid':166 'via':10,27 'x402':11,28,39,89,111 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"8f49403e-82bb-40ee-9c92-ffee4acd9c77","listingId":"5a623157-f96c-4453-98b1-e92188355a50","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.570Z"}],"sources":[{"listingId":"5a623157-f96c-4453-98b1-e92188355a50","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.570Z","lastSeenAt":"2026-04-22T04:02:45.975Z"}],"details":{"listingId":"5a623157-f96c-4453-98b1-e92188355a50","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/80 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/80","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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/80"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (6 decimals), making 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/80"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers or agents wanting zero-friction, keyless API access","Micropayment experimentation on Base L2 with USDC","Scenarios where per-call billing is preferred over subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs for production workloads","Callers who cannot settle payments in USDC on the Base network","Use cases requiring known, well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.198Z"},"updatedAt":"2026-04-22T04:02:45.975Z"}}