{"id":"6829ed0f-69be-4c9e-9a55-d271a05e81ae","shortId":"H5KPgf","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 utility services. Every endpoint is priced at $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 each request.\n\nThe specific endpoint at `/api/v1/payments/147` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20000 base units of USDC (contract 0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also hosts 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.\n\nDocumentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what inputs this specific endpoint expects or what it returns.","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":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-auth api","crypto payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) return no useful content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation is available for any endpoint.","The specific functionality of /api/v1/payments/147 ('Premium API Access') is undocumented — it is unclear what inputs it expects or what it returns.","The broad catalog of endpoints (AI, finance, analytics, utils) is listed on the homepage but none have documented request/response schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/147","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/147","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 x402 402 challenge, and the landing page describes the platform's catalog and pricing. However, documentation pages are empty (just 'Connect wallet'), there is no OpenAPI spec, no request/response schemas, and no examples. The specific purpose of /api/v1/payments/147 beyond 'Premium API Access' is unknown. This is effectively a stub 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'/api/v1/payments/147':111 '/docs':184 '/pricing':186 '/readme':188 '/request':12,28 '0.02':11,27,63,141,176 '0x8335':135 '20000':129 '2913':136 '402':225 '6':145 'accept':119 'access':117 'advertis':125 'ai-inference' 'ai/ml':51 'also':149 'analysi':154 'analyt':50 'api':5,14,21,30,39,81,116 'attach':92 'avail':214 'base':8,24,71,130,138 'base network api' 'broad':44 'call':4,20 'caller':90 'catalog':45 'challeng':124,230 'classif':157 'classification' 'commit':89 'confirm':222 'connect':194 'content':200 'contract':134 'convers':169 'crawl':217 'crypto payment api' 'crypto-data' 'data':49,54 'data-analytics' 'decim':146 'document':179,209,233 'embed':158 'embeddings' 'enabl':38 'endpoint':47,59,109,151,220,241 'equal':140 'estim':166 'everi':58 'exampl':213 'exchang':161 'expect':242 'extrem':181 'feed':160 'finance-data' 'finance/web3':53 'gas':165 'generat':171 'geocod':167 'geocoding' 'given':142 'header':97 'host':150 'infer':52 'input':238 'key':15,31,82 'limit':85 'list':113 'live':223 'low payment fee' 'lowpaymentfee.com':33 'materi':218 'maxamountrequir':127 'micropayment api' 'network':72 'no-api-key' 'no-auth api' 'offer':42 'openapi':204 'page':189 'paid':66 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payment':76,96,102 'per':3,19,64 'platform':6,22,40,148 'point':178 'post':120 'premium':115 'price':61,159,177 'prompt':196 'proof':103 'protocol':77 'quot':164 'rate':84,162 'render':191 'request':65,106,121 'request/response':207 'requir':16,32 'return':224,246 'schema':208 'sentiment':153 'sentiment-analysis' 'servic':57 'simpli':91 'span':48 'spars':182 'spec':205 'specif':108,240 'subscript':88 'summar':156 'text':155 'text-summarization' 'token':163 'unclear':236 'unit':131 'usag':212 'usdc':68,133,143 'usdc api' 'usdc-base' 'util':56 'utility-services' 'valid':100,168,228 'via':9,25,73 'wallet':195 'without':232 'x':95 'x-payment':94 'x402':10,26,37,75,101,123,229 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"8f4cc406-53ed-4a1e-8ee3-fac9d2dd2a12","listingId":"6829ed0f-69be-4c9e-9a55-d271a05e81ae","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.280Z"}],"sources":[{"listingId":"6829ed0f-69be-4c9e-9a55-d271a05e81ae","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.280Z","lastSeenAt":"2026-04-23T05:01:22.226Z"}],"details":{"listingId":"6829ed0f-69be-4c9e-9a55-d271a05e81ae","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/147 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/147"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation calls on a per-request payment basis","Exporting analytics data or generating reports with no upfront commitment","Integrating pay-per-use endpoints into autonomous AI agent workflows"],"bestFor":["AI agents needing keyless, on-demand API access paid in crypto","Developers who want to avoid subscription lock-in for low-volume API usage","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users without a Base-compatible wallet or USDC holdings","Anyone needing detailed API documentation or SLAs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.228Z"},"updatedAt":"2026-04-23T05:01:22.226Z"}}