{"id":"3271257d-75e2-4379-84a6-b893c3ef5b06","shortId":"gSrTGz","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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 is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 protocol handles payment inline: callers attach an X-PAYMENT header with a signed USDC payment, and the server fulfills the request upon verification.\n\nThe specific endpoint `/api/v1/policies/75` is listed as \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. No detailed input/output schema or documentation beyond the landing page is available — the docs, pricing, and API pages all resolve to a wallet-connect stub with no further content.\n\nBecause the endpoint path (`/policies/75`) doesn't clearly map to any of the advertised API categories (analytics, AI, finance, utilities), its exact functionality is unclear. The \"Premium API Access\" label is generic. The platform appears live and the 402 challenge is well-formed, but the lack of documentation, input schemas, and example responses makes it difficult to know what data or service this specific endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["The exact functionality of /api/v1/policies/75 ('Premium API Access') is unknown — it does not map to any documented endpoint category on the landing page.","All documentation pages (docs, pricing, API, README) resolve to empty 'Connect wallet' stubs with no usable content.","No input schema or example responses are available for this endpoint.","The platform lists many endpoints on its landing page but provides no technical documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/75","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/policies/75","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 well-formed, confirming the endpoint exists and accepts USDC payments at $0.02. However, there is no documentation, no input/output schema, no examples, and the specific purpose of /api/v1/policies/75 is entirely unclear. The docs/pricing/API pages are all empty wallet-connect 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'/call':13,28 '/policies/75':189 '0.02':12,27,61,141 '000':130 '0x8335':135 '20':129 '2913':136 '402':223 '402 payment protocol' '6':145 'Base network API' 'USDC micropayment API' 'accept':149 'access':117,213 'advertis':124,198 'ai':202 'ai/ml':49 'amount':127 'analyt':48,201 'api':5,20,37,73,116,171,199,212 'appear':219 'application/json':120 'attach':89 'avail':166 'base':8,23,69,131,138 'beyond':161 'broad':42 'caller':88 'catalog':43 'categori':200 'challeng':123,224 'clear':192 'commit':81 'connect':179 'content':184 'crypto-paid API' 'data':47,52,245 'decim':146 'detail':156 'difficult':241 'discover':154 'doc':168 'document':160,233 'doesn':190 'enabl':36 'endpoint':45,57,110,148,187,250 'equal':140 'everi':56 'exact':206 'exampl':237 'financ':203 'finance/web3':51 'form':228 'fulfil':103 'function':207 'generic':216 'given':142 'handl':85 'header':94 'infer':50 'infrastructur':54 'inlin':87 'input':234 'input/output':157 'json-response' 'key':74 'know':243 'label':214 'lack':231 'land':163 'limit':77 'list':113 'live':220 'lowpaymentfee' 'lowpaymentfee.com':31 'make':239 'map':193 'max':126 'network':9,24,70 'no-api-key' 'offer':40 'page':164,172 'paid':64 'path':188 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':86,93,99 'per':3,18,62 'platform':6,21,38,218 'post':150 'post-method' 'premium':115,211 'price':59,169 'protocol':84 'provid':251 'rate':76 'request':4,19,63,105,151 'resolv':174 'respons':238 'return':119 'schema':158,235 'server':102 'servic':247 'sign':97 'span':46 'specif':109,249 'stub':180 'unclear':209 'unit':132 'upfront':80 'upon':106 'usdc':15,30,66,98,134,143 'usdc-base-network' 'util':55,204 'verif':107 'via':10,25 'wallet':178 'wallet-connect':177 'well':227 'well-form':226 'x':92 'x-payment':91 'x402':11,26,35,83,122 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3466f78a-4a3e-4ad2-8d94-25ed396af56d","listingId":"3271257d-75e2-4379-84a6-b893c3ef5b06","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/policies/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:00.824Z"}],"sources":[{"listingId":"3271257d-75e2-4379-84a6-b893c3ef5b06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:00.824Z","lastSeenAt":"2026-04-24T00:32:16.730Z"}],"details":{"listingId":"3271257d-75e2-4379-84a6-b893c3ef5b06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/75 \\\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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/75"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/75"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to platform services without subscription or signup"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without USDC on Base or an x402-compatible payment flow","High-volume consumers who need bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.462Z"},"updatedAt":"2026-04-24T00:32:16.730Z"}}