{"id":"a3c1d223-101c-4e74-b116-418cd916d0c4","shortId":"MDvXbs","kind":"x402","title":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/payments/2` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or accounts are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing with no rate limits or minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what request body this particular endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI spec or machine-readable schema available","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The specific purpose and expected request/response format of /api/v1/payments/2 ('Premium API Access') is undocumented","Cannot verify what data or functionality any of the advertised endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 x402 challenge, and the landing page provides a high-level catalog with pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of this specific '/api/v1/payments/2' endpoint is unclear beyond its label. This is effectively a stub 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'/api/v1/payments/2':65 '/docs':173 '/pricing':174 '/readme':177 '/request':19,38,159 '0.02':18,37,82,158 '000':76 '20':75 '402':216 '6':88 'access':70 'account':94 'advertis':114 'ai':12,31,126 'ai-inference' 'analysi':130 'analyt':120 'api':5,24,48,69,91 'attach':99 'avail':204 'base':8,27,57,77 'base network api' 'base-network' 'bodi':227 'broader':112 'call':4,23,84 'caller':97 'categori':116 'challeng':218 'charg':72 'classif':133 'classification' 'collect':42 'commit':167 'confirm':211 'connect':183 'convers':150 'crawl':207 'data':11,30,119,123 'data-analytics' 'decim':89 'detail':190 'document':168,199,221 'embed':134 'embeddings' 'endpoint':16,35,49,63,118,154,209,230 'estim':144 'exampl':203 'exchang':139 'expect':231 'export':124 'extrem':170 'feed':138 'financ':13,32,135 'finance-data' 'four':115 'gas':143 'generat':151 'geocod':148 'geocoding' 'header':104 'i.e':81 'infrastructur':146 'insight':125 'key':92 'label':67 'learn':128 'limit':164 'list':153 'live':212 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'metric':121 'micropayment api' 'minimum':166 'network':58 'no-api-key' 'offer':40 'openapi':194 'page':178 'particular':229 'pay':2,21,45 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':44 'payload':235 'payment':103,109 'per':3,22,46,83 'platform':113 'premium':68 'premium api access' 'price':137,160 'prompt':185 'proof':110 'proper':215 'protocol':54 'quot':142 'rate':140,163 'render':180 'report':122 'request':47,226 'request/response':197 'requir':96 'respons':234 'return':213,237 'schema':198 'sentiment':129 'sentiment-analysis' 'settl':50 'share':155 'simpli':98 'sinc':85 'spars':171 'spec':195 'specif':62 'suit':6,25 'summar':132 'technic':189 'text':131 'text-summarization' 'token':141 'unclear':224 'unit':78 'usag':202 'usdc':60,80,86 'usdc api' 'usdc-settlement' 'use':59,87 'util':15,34,147 'utility-apis' 'valid':107,149 'via':9,28,51 'wallet':184 'web3':136 'without':220 'x':102 'x-payment':101 'x402':10,29,53,108,217 'x402 api' 'x402-payment'","prices":[{"id":"cb3118e6-cc9c-4efa-993c-51b0a5901b42","listingId":"a3c1d223-101c-4e74-b116-418cd916d0c4","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:55.356Z"}],"sources":[{"listingId":"a3c1d223-101c-4e74-b116-418cd916d0c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:55.356Z","lastSeenAt":"2026-04-22T23:01:42.513Z"}],"details":{"listingId":"a3c1d223-101c-4e74-b116-418cd916d0c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/2"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/2"},{"claim":"Platform advertises $0.02/request pricing across all endpoints with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, or exchange rates with per-call payment","Running geocoding or data validation tasks with no subscription commitment","Programmatic data export and analytics queries paid per request via crypto"],"bestFor":["AI agents and bots that can settle payments via x402 on Base","Developers wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where per-call pricing is more economical than subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up significantly","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.569Z"},"updatedAt":"2026-04-22T23:01:42.513Z"}}