{"id":"19631942-d3ad-4f1a-abdb-de5de578b85f","shortId":"SEFN68","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","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 with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each HTTP request and receive the response immediately.\n\nThe specific endpoint listed here (`/api/v1/orders/91`) is labeled \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 — consistent with the site's uniform pricing. The endpoint accepts POST requests and is discoverable.\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 data generation. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, request schemas, and response formats of these endpoints remain undocumented in the crawled material.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","data-analytics","ai-sentiment","text-summarization","classification","embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","utility-services"],"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"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) returned no substantive content — only 'Connect wallet' prompts.","No OpenAPI or schema available; request body format and response structure are unknown.","The endpoint path '/api/v1/orders/91' with description 'Premium API Access' is generic and does not clarify what this specific order endpoint returns.","The broader platform lists many endpoint categories (AI, finance, utils) but none have documented schemas or example payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/91","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/orders/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The specific purpose of /api/v1/orders/91 ('Premium API Access') is vague and undifferentiated from the rest of the 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'/call':13,28 '0.02':12,27,59,136 '000':123 '0x8335':128 '20':122 '2913':129 '6':132 'accept':146 'access':110 'actual':196 'advertis':117,155 'ai-sentiment' 'ai/ml':49 'amount':120 'analysi':159 'analyt':48 'api':5,20,37,71,109 'application/json':113 'attach':87 'base':8,23,67,124,131 'base network api' 'behavior':197 'broad':42 'broader':153 'caller':86 'catalog':43 'challeng':116 'classif':162 'classification' 'commit':78 'connect':187 'consist':137 'content':193 'convers':174 'cost':58 'crawl':210 'crypto-gas' 'data':47,52,176 'data-analytics' 'decim':133 'discover':151 'doc':181 'document':179 'embed':163 'embeddings' 'enabl':36 'endpoint':45,57,102,145,156,205 'equal':135 'estim':171 'everi':56 'exchang':166 'exchange-rates' 'feed':165 'finance-prices' 'finance/web3':51 'format':202 'gas':170 'generat':177 'geocod':172 'geocoding' 'handl':83 'header':90 'howev':178 'http':93 'immedi':99 'infer':50 'inlin':85 'json-api' 'key':72 'label':107 'limit':75 'list':103 'low payment fee' 'lowpaymentfee.com':31 'materi':211 'max':119 'micropayment api' 'network':9,24,68 'no-auth api' 'offer':40 'page':180 'paid':62 'pay':2,17 'pay per call api' 'pay-per-request':1,16 'payment':84,89 'per':3,18,60 'platform':6,21,38,154 'post':147 'premium':108 'price':143,164,182 'prompt':189 'protocol':82 'quot':169 'rate':74,167 'readm':183 'receiv':96 'remain':206 'request':4,19,61,94,148,198 'requir':79 'respons':98,201 'return':112,184 'schema':199 'sentiment':158 'servic':55 'site':140 'span':46 'specif':101 'substant':192 'summar':161 'text':160 'text-summarization' 'token':168 'undocu':207 'uniform':142 'unit':125 'usdc':15,30,64,127 'usdc api' 'usdc-base' 'util':54 'utility-services' 'valid':173 'via':10,25 'wallet':188 'x402':11,26,35,81,115 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"1dec4f03-6692-4e35-b485-2abb5f292da1","listingId":"19631942-d3ad-4f1a-abdb-de5de578b85f","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/orders/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:43.525Z"}],"sources":[{"listingId":"19631942-d3ad-4f1a-abdb-de5de578b85f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:43.525Z","lastSeenAt":"2026-04-22T19:30:52.720Z"}],"details":{"listingId":"19631942-d3ad-4f1a-abdb-de5de578b85f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/91 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 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, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/91"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API calls where per-request crypto payment replaces API key management","Accessing AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time financial data (prices, exchange rates, gas estimates) on demand","Geocoding and data conversion utilities paid per use"],"bestFor":["Developers and agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users who need detailed API documentation, request/response schemas, or error handling guides","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.979Z"},"updatedAt":"2026-04-22T19:30:52.720Z"}}