{"id":"8d8a4e63-a7ba-405b-8bff-e96eef27429e","shortId":"CnRzwr","kind":"x402","title":"x402-payable API platform on Base network offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base network offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a variety of endpoints across data analytics, AI/ML inference, finance/crypto, and infrastructure utilities. All endpoints are payable per-request via the x402 protocol on the Base network using USDC (USD Coin). The specific endpoint at `/api/v1/item/27` is listed as \"Premium API Access\" and accepts POST requests, returning application/json responses.\n\nThe platform advertises a flat $0.02 per request pricing model with no API keys, no rate limits, no minimums, and instant access. Payment is handled via the x402 payment header using the \"exact\" scheme on Base, with the max amount required set to 20000 (in USDC's 6-decimal representation, this equals $0.02). The pay-to address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/v1/item/27` specifically returns. The endpoint is confirmed live (402 challenge captured), but without documentation it is unclear what data or functionality this particular item provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-pricing","json-response","post-method","no-api-key-required"],"categories":["api-marketplace","x402"],"synonyms":["lowpaymentfee","low payment fee API","x402 paid API","USDC API access","Base network API","pay-per-request API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or output schema describing what /api/v1/item/27 returns","The specific purpose of /api/v1/item/27 ('Premium API Access') is completely undocumented","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/27","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/item/27","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 402 challenge, but there is zero documentation on what /api/v1/item/27 actually does or returns. No OpenAPI schema, no request/response examples, and all doc pages are empty beyond a wallet connect prompt. The listing is effectively a 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'/request':18,36 '0.02':17,35,102,149 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':163 '20000':140 '402':207 '6':144 'Base network API' 'USDC API access' 'accept':91 'access':89,118 'across':51 'address':154 'advertis':99 'ai':11,29 'ai/ml':54 'amount':136 'analyt':53 'api':4,22,43,88,109,170 'application/json':95 'asset':160 'base':7,25,73,132 'captur':209 'challeng':208 'coin':78 'confirm':205 'connect':179 'content':185 'contract':161 'data':10,28,52,217 'decim':145 'descript':196 'doc':169 'document':164,212 'enabl':42 'endpoint':15,33,50,61,81,203 'equal':148 'exact':129 'exampl':193 'expos':46 'extrem':166 'financ':12,30 'finance/crypto':56 'flat':101 'function':219 'handl':121 'header':126 'infer':55 'infrastructur':58 'instant':117 'item':222 'json-response' 'key':110 'limit':113 'list':85 'live':206 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'marketplac':44 'max':135 'micropayment API' 'minimum':115 'model':106 'network':8,26,74 'no-api-key-required' 'offer':9,27 'openapi':189 'page':174 'particular':221 'pay':152 'pay-per-request API' 'pay-to':151 'payabl':3,21,63 'payment':119,125 'per':65,103 'per-request':64 'per-request-pricing' 'platform':5,23,98 'post':92 'post-method' 'premium':87 'price':105,171 'prompt':181 'protocol':70 'provid':223 'rate':112 'readm':173 'render':176 'represent':146 'request':66,93,104 'request/response':192 'requir':137 'respons':96 'return':94,201 'schema':190 'scheme':130 'set':138 'spars':167 'specif':80,200 'unclear':215 'usd':77 'usdc':76,142,159 'usdc-base-network' 'use':75,127 'util':14,32,59 'varieti':48 'via':67,122 'wallet':180 'without':211 'x402':2,20,41,69,124 'x402 paid API' 'x402-enabled':40 'x402-payable':1,19 'x402-payment'","prices":[{"id":"1164d523-f8a6-4867-9fa2-8634b51e9ada","listingId":"8d8a4e63-a7ba-405b-8bff-e96eef27429e","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/item/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:55.402Z"}],"sources":[{"listingId":"8d8a4e63-a7ba-405b-8bff-e96eef27429e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:55.402Z","lastSeenAt":"2026-04-23T20:01:19.757Z"}],"details":{"listingId":"8d8a4e63-a7ba-405b-8bff-e96eef27429e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/27 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat $0.02 per request pricing with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment via USDC on Base network with maxAmountRequired of 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/item/27"},{"claim":"Pay-to address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/item/27"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/item/27"},{"claim":"Endpoint accepts POST method and returns application/json","source_url":"https://lowpaymentfee.com/api/v1/item/27"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without traditional API key registration","Making micropayment-gated API calls from autonomous agents on Base","Pay-per-use access to data, AI, finance, or utility endpoints"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-cost micropayment API experimentation"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume use cases where per-request pricing may be expensive at scale","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:21:05.841Z"},"updatedAt":"2026-04-23T20:01:19.757Z"}}