{"id":"611c852d-05f5-43bd-b521-37ecbaa60cec","shortId":"XNTUc3","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 hosts a collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol — no API keys, no subscriptions, no rate limits.\n\nThe specific endpoint at `/api/v1/inbox/154` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe broader platform advertises additional endpoints including 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/request price point. However, the specific functionality behind the `/api/v1/inbox/154` \"Premium API Access\" endpoint is not documented, and no request/response schema is provided beyond the x402 challenge metadata. The crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint"],"categories":["api-platform","infrastructure"],"synonyms":["pay per call API","x402 API","USDC API","micropayment API","Base network API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/inbox/154 is not documented — 'Premium API Access' is the only description available.","No request or response schema is provided; callers cannot know what to send or what to expect back.","Documentation pages (/api, /pricing, /README) returned no useful content beyond a wallet-connect prompt.","The platform lists many endpoints on its homepage but none have detailed docs visible in the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/154","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base), but the specific functionality of the /api/v1/inbox/154 endpoint is entirely undocumented. No request schema, no response schema, no examples, and the docs/pricing/README pages all returned only a wallet-connect prompt. The endpoint's purpose behind 'Premium API Access' is 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'/request':19,38,176 '0.02':18,37,125,175 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':119 '20':113 '2913':120 '300':143 '6':130 'Base network API' 'USDC API' 'accept':102 'access':100,188 'addit':149,219 'address':137 'advertis':108,148 'ai':12,31,56 'analysi':153 'analyt':55 'api':5,24,45,83,99,187 'base':8,27,75,115,122 'behind':183 'beyond':199 'broader':146 'call':4,23 'challeng':107,202 'classif':156 'collect':50 'connect':215 'convers':168 'cost':111 'crawl':205 'data':11,30,54 'decim':131 'detail':220 'doc':206 'document':192 'embed':157 'enabl':44 'endpoint':16,35,52,65,92,150,189 'equal':124 'estim':165 'exchang':160 'feed':159 'financ':13,32,59 'function':182 'gas':164 'generat':170 'geocod':166 'host':48 'howev':179 'includ':151 'infrastructur':62 'key':84 'learn':58 'limit':89 'list':96 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':57 'maximum':110 'metadata':203 'micropayment API' 'network':76 'no-api-key' 'offer':10,29 'page':209 'pay':2,21,68 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':67 'payment':133 'per':3,22,69,126 'platform':6,25,46,147 'point':178 'post':103 'post-endpoint' 'premium':98,186 'premium API access' 'price':158,177,208 'prompt':216 'protocol':81 'provid':198 'quot':163 'rate':88,161 'request':70,104,127 'request/response':195 'return':210 'schema':196 'second':144 'sent':135 'sentiment':152 'settl':77 'span':53 'specif':91,181 'subscript':86 'summar':155 'text':154 'timeout':141 'token':162 'unit':116 'usdc':9,28,72,118,128 'usdc-base' 'use':71,129 'util':15,34,63 'valid':167 'via':78 'wallet':214 'wallet-connect':213 'web3':60 'x402':43,80,106,201 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"a6cff41a-087f-438a-9817-008528fd2ebd","listingId":"611c852d-05f5-43bd-b521-37ecbaa60cec","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/154","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.268Z"}],"sources":[{"listingId":"611c852d-05f5-43bd-b521-37ecbaa60cec","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/154","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.268Z","lastSeenAt":"2026-04-22T15:02:57.852Z"}],"details":{"listingId":"611c852d-05f5-43bd-b521-37ecbaa60cec","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/154 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/inbox/154"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/inbox/154"},{"claim":"The platform lists endpoints for analytics, AI, finance, and utility categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to utility or data endpoints with crypto micropayments","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol experimentation on Base with USDC","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented request/response schemas upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.275Z"},"updatedAt":"2026-04-22T15:02:57.852Z"}}