{"id":"58fdc73c-2f2a-44bd-be70-6b6e32f4b00c","shortId":"At7ggU","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request 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 at `/api/v1/payments/260` 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/260` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this specific route provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","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 specific functionality of /api/v1/payments/260 ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/260","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/260","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of this specific endpoint (/api/v1/payments/260) is unclear beyond the generic 'Premium API Access' label. The listing is effectively a 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'/api/v1/payments/260':57,193 '/docs':161 '/pricing':163 '/readme':165 '/request':13,28,153 '0.02':12,27,79,152 '000':73 '20':72 '402':67 'Base network API' 'USDC API access' 'accept':46 'access':63,93,227 'across':109 'actual':195 'advertis':84 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,62,86,226 'attach':96 'base':8,23,51,74 'beyond':222 'broader':105 'call':4,19,81 'categori':111 'challeng':68,207 'classif':126 'connect':171 'content':177 'convers':143 'data':112,116,215 'descript':189 'detail':188 'document':156,210 'embed':127 'endpoint':55,108,146,194,198 'estim':137 'exampl':185 'exchang':132 'export':117 'extrem':158 'feed':131 'financ':128 'four':110 'function':217 'gas':136 'generat':144 'generic':224 'geocod':141 'header':100 'http-post' 'i.e':78 'infrastructur':139 'insight':118 'instant':92 'key':87 'label':228 'learn':121 'limit':90 'list':59,148 'live':200 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'metric':114 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':107 'openapi':181 'page':166 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99 'per':3,18,36,80 'platform':6,21,39,83,106 'point':155 'premium':61,225 'price':130,154 'prompt':173 'protocol':44 'provid':221 'quot':135 'rate':89,133 'render':168 'report':115 'request':37,69,103 'request/response':184 'respond':202 'return':65,196 'rout':220 'schema':182 'sentiment':122 'simpli':95 'spars':159 'specif':54,219 'summar':125 'text':124 'token':134 'unclear':213 'unit':75 'usdc':15,30,47,77 'usdc-base-network' 'use':41 'util':140 'valid':142,205 'via':10,25 'wallet':172 'web3':129 'without':209 'x402':11,26,43,98,206 'x402 API' 'x402-payment'","prices":[{"id":"660584e9-fce0-4b38-80cf-93ac328b78ef","listingId":"58fdc73c-2f2a-44bd-be70-6b6e32f4b00c","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/260","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:07.580Z"}],"sources":[{"listingId":"58fdc73c-2f2a-44bd-be70-6b6e32f4b00c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/260","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:07.580Z","lastSeenAt":"2026-04-24T01:32:20.529Z"}],"details":{"listingId":"58fdc73c-2f2a-44bd-be70-6b6e32f4b00c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/260 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/payments/260"},{"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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/260"}],"useCases":["Programmatic access to paid API endpoints without traditional API key registration","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.997Z"},"updatedAt":"2026-04-24T01:32:20.529Z"}}