{"id":"92f4c157-d3fd-4b7c-b8f4-feb865d59af3","shortId":"Cjh48R","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/payments/20` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises a uniform $0.02 price across all its endpoints. Categories of available APIs include: metrics and reports (analytics), sentiment analysis, text summarization, classification, and embeddings (AI/ML), price feeds, exchange rates, token quotes, and gas estimates (finance/crypto), and geocoding, validation, conversion, and generation (utilities).\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available from the crawl. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto pay api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","The specific purpose of the /api/v1/payments/20 endpoint labeled 'Premium API Access' is unclear — it may be a generic payment test endpoint rather than a functional API","No examples of successful responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/20","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/20","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 pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The docs, pricing, and README pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/payments/20':108 '/docs':183 '/pricing':184 '/readme':187 '/request':13,30 '0.02':12,29,127,135 '000':121 '20':120 '402':226 'access':114 'across':49,137 'addit':198 'advertis':132 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':52,157 'analysi':151 'analyt':51,149 'api':5,15,22,32,41,79,113,144 'attach':90 'avail':143,214 'base':8,25,69,122 'base network api' 'beyond':176 'bodi':241 'call':4,21,129 'caller':88 'categori':141 'challeng':228 'classif':154 'commit':87 'confirm':221 'connect':193 'convers':171 'conversion' 'crawl':217 'crypto pay api' 'crypto-gas-estimates' 'data':50 'data-analytics' 'detail':200 'difficult':236 'document':175,209,233 'embed':156 'enabl':40 'endpoint':48,59,106,140,219 'estim':166 'exampl':212 'exchang':160 'exchange-rates' 'expect':248 'feed':159 'finance-price-feeds' 'finance/crypto':167 'finance/web3':54 'gas':165 'generat':173 'geocod':169 'geocoding' 'header':95 'i.e':126 'includ':145 'infer':53 'infrastructur':56 'key':16,33,80 'know':238 'lack':231 'land':178 'limit':83 'list':110 'live':222 'low payment fee' 'lowpaymentfee.com':35 'make':234 'maximum':118 'metric':146 'micropayment api' 'network':70 'no-api-key' 'no-auth api' 'offer':44 'openapi':204 'page':179,188 'pay':2,19,62 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':61 'payload':213 'payment':94,99 'per':3,20,63,128 'platform':6,23,42,131 'premium':112 'price':136,158 'prompt':195 'proof':100 'proper':225 'protocol':75 'quot':163 'rate':82,161 'render':190 'report':148 'request':64,103,240 'request/response':207 'requir':17,34,116 'respons':246 'return':223 'schema':208 'send':243 'sentiment':150 'settl':71 'simpli':89 'spars':181 'spec':205 'specif':105 'subscript':86 'summar':153 'technic':199 'text':152 'token':162 'uniform':134 'unit':123 'usdc':9,26,66,125 'usdc api' 'usdc-base-network' 'use':65 'util':57,174 'valid':98,170 'validation' 'varieti':46 'via':10,27,72 'wallet':194 'x':93 'x-payment':92 'x402':11,28,39,74,227 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"29726f97-7f20-48b0-be4a-0e5a3d345ff0","listingId":"92f4c157-d3fd-4b7c-b8f4-feb865d59af3","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:48.935Z"}],"sources":[{"listingId":"92f4c157-d3fd-4b7c-b8f4-feb865d59af3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:48.935Z","lastSeenAt":"2026-04-22T15:01:35.668Z"}],"details":{"listingId":"92f4c157-d3fd-4b7c-b8f4-feb865d59af3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/20 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns 402 with x402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/20"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/20"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and 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 crypto token quotes, gas estimates, or exchange rates with per-call payment","Geocoding or data validation as a utility service paid in USDC on Base","Exporting analytics data or generating reports via pay-per-request endpoints"],"bestFor":["AI agents and bots that can settle x402 payments autonomously","Developers who want zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or rate guarantees","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.855Z"},"updatedAt":"2026-04-22T15:01:35.668Z"}}