{"id":"a50f622c-4f41-45d1-acfd-7f5572a14a3f","shortId":"nKTUJ5","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 an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no signup — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/payments/177` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including: metrics and reports APIs, data export and insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation utilities. However, documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","no-auth API","lowpaymentfee","micro-payment endpoint"],"warnings":["All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content","No OpenAPI or schema available — request/response formats are unknown","The specific endpoint /api/v1/payments/177 is labeled 'Premium API Access' but its actual functionality is undocumented","The broad catalog of advertised endpoints (AI, finance, utils) cannot be verified from crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/177","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/177","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 (all doc pages return only 'Connect wallet'), no example responses, and the actual functionality behind 'Premium API Access' at /api/v1/payments/177 is completely undescribed. The platform lists many endpoint categories but provides no detail on inputs, outputs, or 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'/request':12,28 '0.02':11,27,63,137 '000':126 '0x8335':131 '20':125 '2913':132 '300':150 '402':120 '6':141 'Base network API' 'USDC micropayment API' 'accept':155 'access':103,116 'actual':214 'advertis':164 'ai-inference' 'ai/ml':51 'analysi':176 'analyt':50 'api':5,14,21,30,39,80,115,170 'application/json':160 'attach':90 'base':8,24,71,127,134 'behavior':215 'broad':44 'broader':162 'call':4,20 'caller':88 'catalog':45 'categori':165 'challeng':121 'classif':179 'classification' 'connect':205 'content':211 'convers':191 'crawl':226 'crypto-data' 'data':49,54,171 'data-analytics' 'decim':142 'doc':198 'document':196 'embed':180 'embeddings' 'enabl':38 'endpoint':47,59,105,108,154,221 'equal':136 'estim':188 'everi':58 'exact':147 'exchang':183 'export':172 'feed':182 'finance-data' 'finance/web3':53 'gas':187 'generat':193 'geocod':189 'geocoding' 'given':138 'header':95 'howev':195 'includ':166 'infer':52 'infrastructur':56 'insight':174 'key':15,31,81 'limit':84 'list':112 'lowpaymentfee' 'lowpaymentfee.com':33 'materi':227 'metric':167 'micro-payment endpoint' 'network':72 'no-auth API' 'offer':42 'page':197 'paid':66 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':94,100,144 'per':3,19,64 'platform':6,22,40,163 'post':156 'premium':114 'price':61,181,199 'prompt':207 'proof':101 'protocol':76 'quot':186 'rate':83,184 'readm':200 'report':169 'request':65,122,157 'requir':16,32 'respons':217 'return':118,159,202 'schema':218 'scheme':145 'second':151 'sentiment':175 'sentiment-analysis' 'signup':87 'simpli':89 'span':48 'specif':107 'substant':210 'summar':178 'text':177 'text-summarization' 'timeout':152 'token':185 'undocu':223 'unit':128 'usdc':68,130,139 'usdc-base' 'util':57,194 'utility-apis' 'valid':98,190 'via':9,25,73 'wallet':206 'x':93 'x-payment':92 'x402':10,26,37,75,99 'x402 API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"15feaa5c-2586-4a05-bdd1-05825ae42a4d","listingId":"a50f622c-4f41-45d1-acfd-7f5572a14a3f","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/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:38.394Z"}],"sources":[{"listingId":"a50f622c-4f41-45d1-acfd-7f5572a14a3f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:38.394Z","lastSeenAt":"2026-04-23T05:01:22.190Z"}],"details":{"listingId":"a50f622c-4f41-45d1-acfd-7f5572a14a3f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/177 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/payments/177","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/177"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/177"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto prices, gas estimates, and exchange rates on a per-call basis","Running geocoding or data validation as a utility service with instant pay-per-use billing","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents and bots that need keyless, on-demand API access paid in USDC","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Teams without crypto wallets or USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.302Z"},"updatedAt":"2026-04-23T05:01:22.190Z"}}