{"id":"8fd9b569-069b-4266-b304-9e626283dc78","shortId":"CfgLJF","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 `/api/v1/charges/242` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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. Payments settle in USDC on Base to address 0x1A2B...85F3.\n\nNote that the specific endpoint probed (`/api/v1/charges/242`) does not clearly map to any of the named API categories on the landing page, and no OpenAPI schema, detailed documentation, or example responses were found during crawling. The docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no substantive content. The actual functionality behind this particular endpoint is therefore unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The endpoint path /api/v1/charges/242 does not match any named API on the landing page — its actual functionality is unknown","All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","No example requests or responses are available to verify what data this endpoint returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/242","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/charges/242","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example requests or responses, and the specific endpoint path (/api/v1/charges/242) does not correspond to any named service. The docs/pricing/API pages are all empty (\"Connect wallet\" 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '0x1a2b':167 '20':71 '402':66 '402 payment API' '85f3':168 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92 'across':112 'actual':222 'address':166 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,185,208 'attach':95 'base':8,23,51,73,164 'behind':224 'broader':108 'call':4,19,80 'caller':93 'categori':114,186 'challeng':67 'classif':129 'clear':178 'connect':214 'content':220 'convers':146 'crawl':203 'crypto-paid API' 'data':115,119 'detail':195 'doc':205 'document':196 'embed':130 'endpoint':55,111,149,173,227 'estim':140 'exampl':198 'exchang':135 'export':120 'feed':134 'financ':131 'found':201 'four':113 'function':223 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'land':189 'learn':124 'limit':89 'list':58,151 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'map':179 'metric':117 'name':184 'network':9,24,52 'no-api-key' 'note':169 'offer':110 'openapi':193 'page':190,209 'particular':226 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105,159 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'premium':60 'price':133,157,206 'probe':174 'prompt':216 'proof':106 'protocol':44 'quot':138 'rate':88,136 'report':118 'request':37,68 'respons':199 'return':64,211 'schema':194 'sentiment':125 'settl':160 'simpli':94 'specif':54,172 'substant':219 'summar':128 'text':127 'therefor':229 'token':137 'unclear':230 'unit':74 'usdc':15,30,47,76,162 'usdc-base' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':215 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"f0aedd85-5e08-4b21-8338-9d65f52ab4ed","listingId":"8fd9b569-069b-4266-b304-9e626283dc78","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/charges/242","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:41.797Z"}],"sources":[{"listingId":"8fd9b569-069b-4266-b304-9e626283dc78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/242","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:41.797Z","lastSeenAt":"2026-04-23T09:31:00.472Z"}],"details":{"listingId":"8fd9b569-069b-4266-b304-9e626283dc78","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/242 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/charges/242"},{"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/242"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Geocoding and data conversion utilities with no rate limits"],"bestFor":["Developers who want pay-per-use API access without API keys or accounts","Agents and bots that can settle payments via x402 on Base","Low-volume or bursty workloads where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring predictable bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.617Z"},"updatedAt":"2026-04-23T09:31:00.472Z"}}