{"id":"b3fc7a08-d41f-416f-ba71-b1483fd37e7b","shortId":"hdBEyp","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network 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 utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/transactions/171` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI schema, request/response examples, or detailed endpoint documentation were found.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","no-subscription API"],"warnings":["No documentation available beyond the landing page — docs, API, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The endpoint path '/api/v1/transactions/171' with description 'Premium API Access' does not appear in the landing page's listed endpoints, making its actual functionality unclear","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/171","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/transactions/171","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 with clear pricing. However, documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. No OpenAPI schema, no request/response examples, and no description of what '/api/v1/transactions/171' actually returns. The listing is largely a 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'/request':13,30 '0.02':12,29,63,141,188 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':136 '20000':130 '300':156 '6':145 'Base network API' 'USDC micropayment API' 'accept':120 'access':105,118 'address':152 'advertis':126,162 'ai-inference' 'ai/ml':53 'analysi':166 'analyt':52 'api':5,15,22,32,41,81,117,202 'attach':92 'base':8,25,71,131,138 'beyond':193 'broad':46 'broader':160 'call':4,21 'caller':90 'catalog':47 'challeng':125 'classif':169 'classification' 'commit':89 'connect':211 'contract':135 'convers':181 'cost':62 'crypto-data' 'crypto-paid API' 'data':51,56 'data-analytics' 'decim':146 'detail':218,225 'doc':201 'document':192,227 'embed':170 'embeddings' 'enabl':40 'endpoint':49,61,107,110,163,226 'equal':140 'estim':178 'everi':60 'exampl':223 'exchang':173 'extrem':198 'feed':172 'finance-data' 'finance/web3':55 'found':229 'gas':177 'generat':183 'geocod':179 'geocoding' 'given':142 'header':97 'howev':191 'infer':54 'key':16,33,82 'land':195 'limit':85 'list':114 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':128 'network':9,26,72 'no-api-key' 'no-subscription API' 'offer':44 'openapi':220 'page':196,206 'paid':66 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':76,96,102,148 'per':3,20,64 'platform':6,23,42,161 'point':190 'post':121 'premium':116 'price':171,189,203 'prompt':213 'proof':103 'protocol':77 'quot':176 'rate':84,174 'readm':205 'render':208 'request':65,122 'request/response':222 'requir':17,34 'schema':221 'second':157 'sent':150 'sentiment':165 'sentiment-analysis' 'servic':59 'simpli':91 'span':50 'spars':199 'specif':109 'subscript':88 'summar':168 'technic':217 'text':167 'text-summarization' 'timeout':158 'token':175 'unit':132 'usdc':68,134,143 'usdc-base' 'util':58 'utility-services' 'valid':100,180 'via':10,27,73 'wallet':212 'x':95 'x-payment':94 'x402':11,28,39,75,101,124 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"92757b1e-dd99-4ef5-8a46-6edde9c3a2ae","listingId":"b3fc7a08-d41f-416f-ba71-b1483fd37e7b","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/transactions/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:58.249Z"}],"sources":[{"listingId":"b3fc7a08-d41f-416f-ba71-b1483fd37e7b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:58.249Z","lastSeenAt":"2026-04-22T21:31:37.166Z"}],"details":{"listingId":"b3fc7a08-d41f-416f-ba71-b1483fd37e7b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/171 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/171"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/171"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"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 utilities with micropayment-based access","Exporting data or generating analytics reports without subscription overhead"],"bestFor":["Agents and bots that need stateless, pay-per-call API access without credentials","Developers prototyping with low-cost, no-commitment API endpoints","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.526Z"},"updatedAt":"2026-04-22T21:31:37.166Z"}}