{"id":"e8370621-cf0e-4ab6-9ca0-f559e0b9148c","shortId":"g9LqKw","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/5` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base. The site advertises a uniform $0.02 per request across all endpoints. Other available endpoints include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 crawl. The exact functionality of the `/api/v1/transactions/5` endpoint is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","no-auth api","serverless api marketplace"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation available — request and response formats are unknown.","The specific functionality of /api/v1/transactions/5 ('Premium API Access') is not documented anywhere in the crawl.","The site lists many endpoints but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/5","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/5","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 it accepts USDC on Base at $0.02/request. However, documentation is essentially nonexistent — no OpenAPI spec, no request/response schemas, no examples, and the specific purpose of /api/v1/transactions/5 is unclear. The listing is effectively a 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'/api/v1/transactions/5':112,214 '/docs':175 '/pricing':176 '/readme':179 '/request':19,38 '0.02':18,37,133,142 '000':128 '20':127 '402':122 'access':118,222 'across':145 'advertis':139 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':153 'analyt':56 'api':5,24,45,80,117,221 'attach':96 'avail':149,205 'base':8,27,76,129,136 'base usdc api' 'beyond':218 'broad':50 'call':4,23 'caller':95 'challeng':123 'classif':156 'classification' 'collect':51 'connect':185 'content':191 'convers':166 'crawl':208 'crypto-data' 'data':11,30,55,60,168 'data-analytics' 'document':170,200 'embed':157 'embeddings' 'enabl':44 'endpoint':16,35,53,66,110,147,150,215 'estim':163 'exact':210 'exampl':204 'exchang':160 'export':169 'extrem':172 'feed':159 'financ':13,32 'finance-data' 'finance/web3':59 'function':211 'gas':162 'general':62 'geocod':164 'geocoding' 'handl':92 'header':99 'immedi':107 'includ':151 'infer':58 'inlin':94 'key':81 'label':223 'limit':84 'list':114 'low payment fee' 'lowpaymentfee.com':39 'micropayment api' 'network':77 'no-auth api' 'offer':48 'openapi':195 'page':180 'pay':2,21,69 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':68 'payment':93,98 'per':3,22,70,143 'platform':6,25,46 'premium':116,220 'price':158 'prompt':187 'protocol':91 'rate':83,161 'receiv':104 'render':182 'request':71,102,124,144 'request/response':198 'requir':88 'respons':106 'return':120 'schema':199 'sentiment':152 'sentiment-analysis' 'serverless api marketplace' 'servic':64 'site':138 'span':54 'spars':173 'spec':196 'specif':109 'subscript':87 'summar':155 'text':154 'text-summarization' 'unclear':217 'uniform':141 'unit':130 'usag':203 'usd':134 'usdc':73,132 'usdc-base' 'use':72 'util':15,34,63 'utility-apis' 'valid':165 'via':9,28 'wallet':186 'x402':10,29,43,90 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3b3bd76b-573c-47bd-a4bf-e2d9b1910833","listingId":"e8370621-cf0e-4ab6-9ca0-f559e0b9148c","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:56.828Z"}],"sources":[{"listingId":"e8370621-cf0e-4ab6-9ca0-f559e0b9148c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:56.828Z","lastSeenAt":"2026-04-22T16:32:14.419Z"}],"details":{"listingId":"e8370621-cf0e-4ab6-9ca0-f559e0b9148c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/5 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/5"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/5"}],"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, validation, or data conversion tasks with instant pay-per-use billing","Agents autonomously purchasing API calls using x402 USDC payments on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","Low-volume or bursty workloads where subscriptions are wasteful","Crypto-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate-limit guarantees, or detailed documentation","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.503Z"},"updatedAt":"2026-04-22T16:32:14.419Z"}}