{"id":"72b19c6a-d57c-45e7-8f73-e3b92f83b1e2","shortId":"4FDDAf","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/60` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across four categories: 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 endpoints are listed at the same $0.02/request price point.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind the `/api/v1/products/60` endpoint is unclear beyond its \"Premium API Access\" label. The 402 challenge confirms the endpoint is live and accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC on Base.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation is available for any endpoint.","The specific functionality of /api/v1/products/60 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","No request body schema or response format is documented anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/60","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/products/60","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, confirming pricing and payment details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of '/api/v1/products/60' is unclear beyond its generic label. This is essentially a stub 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'/call':13,28 '/request':151 '0.02':12,27,77,150 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':225 '20':70 '402':65,210 'Base network API' 'USDC API' 'accept':46,218 'access':61,91,207 'across':107 'address':224 'advertis':82 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,60,84,160,206 'attach':94 'avail':189 'base':8,23,51,72,229 'behind':197 'beyond':203 'broader':103 'call':79 'categori':109 'challeng':66,211 'classif':124 'confirm':212 'connect':169 'content':175 'convers':141 'crawl':192 'data':110,114 'doc':159 'document':154,184 'embed':125 'endpoint':55,106,144,200,214 'estim':135 'exampl':188 'exchang':130 'export':115 'extrem':156 'feed':129 'financ':126 'four':108 'function':196 'gas':134 'generat':142 'geocod':139 'header':98 'i.e':76 'infrastructur':137 'insight':116 'instant':90 'json-response' 'key':85 'label':58,208 'learn':119 'limit':88 'list':146 'live':216 'low payment fee' 'lowpaymentfee.com':31 'machin':118 'materi':193 'metric':112 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':105 'openapi':179 'page':164 'pay':2,17,35 'pay per call API' 'pay-per-request':1,16,34 'payment':48,97,222 'per':3,18,36,78 'platform':6,21,39,81,104 'point':153 'post':219 'post-method' 'premium':59,205 'premium API access' 'price':128,152,161 'prompt':171 'protocol':44 'quot':133 'rate':87,131 'readm':163 'render':166 'report':113 'request':4,19,37,67,101,220 'request/response':182 'return':63 'schema':183 'sentiment':120 'settl':221 'simpli':93 'spars':157 'spec':180 'specif':54,195 'summar':123 'text':122 'token':132 'unclear':202 'unit':73 'usag':187 'usdc':15,30,47,75,227 'usdc-base-network' 'use':41 'util':138 'valid':140 'via':10,25 'wallet':170 'web3':127 'x402':11,26,43,96 'x402 API' 'x402-payment'","prices":[{"id":"707cd9bd-e99c-4422-9da6-068d7dffa47e","listingId":"72b19c6a-d57c-45e7-8f73-e3b92f83b1e2","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/products/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:09.656Z"}],"sources":[{"listingId":"72b19c6a-d57c-45e7-8f73-e3b92f83b1e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:09.656Z","lastSeenAt":"2026-04-23T19:00:37.453Z"}],"details":{"listingId":"72b19c6a-d57c-45e7-8f73-e3b92f83b1e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/60"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/60"},{"claim":"Payment recipient address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/products/60"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to a multi-category API platform"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk/subscription pricing","Developers who need non-crypto (fiat) payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.543Z"},"updatedAt":"2026-04-23T19:00:37.453Z"}}