{"id":"36d7ddb8-04f9-4429-8846-3af73d9259ed","shortId":"vpmPU7","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","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 at `/api/v1/payments/359` is listed as \"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 schema, no request/response examples, and no detailed description of what the `/api/v1/payments/359` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality \"Premium API Access\" provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/payments/359' ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/359","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/payments/359","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 schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is essentially a 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'/api/v1/payments/359':59,195 '/docs':163 '/pricing':165 '/readme':167 '/request':12,28,155 '0.02':11,27,81,154 '000':75 '20':74 '402':69,203 'Base network API' 'USDC API' 'accept':48 'access':65,95,218 'across':111 'actual':197 'advertis':86 'ai':121 'analysi':125 'analyt':115 'api':5,14,21,30,40,64,88,217 'attach':98 'base':8,24,53,76 'broader':107 'call':4,20,83 'categori':113 'challeng':70,204 'classif':128 'confirm':205 'connect':173 'content':179 'convers':145 'data':114,118,213 'descript':191 'detail':190 'document':158,208 'embed':129 'endpoint':57,110,148,196,200 'estim':139 'exampl':187 'exchang':134 'export':119 'extrem':160 'feed':133 'financ':130 'four':112 'function':215 'gas':138 'generat':146 'geocod':143 'header':102 'i.e':80 'infrastructur':141 'insight':120 'instant':94 'json-response' 'key':15,31,89 'learn':123 'limit':92 'list':61,150 'live':202 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':122 'metric':116 'micropayment API' 'network':54 'no-api-key' 'offer':109 'openapi':183 'page':168 'pay':2,18,37 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':36 'payment':50,101 'per':3,19,38,82 'platform':6,22,41,85,108 'point':157 'premium':63,216 'price':132,156 'prompt':175 'protocol':46 'provid':219 'quot':137 'rate':91,135 'render':170 'report':117 'request':39,71,105 'request/response':186 'requir':16,32 'return':67,198 'schema':184 'sentiment':124 'simpli':97 'spars':161 'specif':56 'summar':127 'text':126 'token':136 'unclear':211 'unit':77 'usdc':49,79 'usdc-base-network' 'use':43 'util':142 'valid':144 'via':9,25 'wallet':174 'web3':131 'without':207 'x402':10,26,45,100 'x402 API' 'x402-payment'","prices":[{"id":"2a27ccf6-ff52-41de-a2b7-5aa1aa97109f","listingId":"36d7ddb8-04f9-4429-8846-3af73d9259ed","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/payments/359","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:25.916Z"}],"sources":[{"listingId":"36d7ddb8-04f9-4429-8846-3af73d9259ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/359","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:25.916Z","lastSeenAt":"2026-04-23T23:02:46.149Z"}],"details":{"listingId":"36d7ddb8-04f9-4429-8846-3af73d9259ed","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/359 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/359"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/359"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.148Z"},"updatedAt":"2026-04-23T23:02:46.149Z"}}