{"id":"745631a3-c2e7-4f42-a13f-778f9dbde6ee","shortId":"TjWnRH","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure/Utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/orders/100` is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform advertises no API keys, no rate limits, and instant access — payment is handled entirely through the x402 protocol's `X-PAYMENT` header. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the USDC asset contract is `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base.\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 examples of what any endpoint actually returns. The endpoint names and categories are listed on the landing page but their actual functionality and response formats are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","sentiment analysis api","text summarization api","embeddings api","geocoding api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt","No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/orders/100 is labeled 'Premium API Access' but its actual function is undocumented","No request body schema or response format is documented anywhere","The broad catalog of 16+ endpoints is listed on the homepage but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/100","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/100","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 works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, no examples, and the actual functionality behind '/api/v1/orders/100' is unclear. The landing page lists many endpoints but provides no detail on inputs or 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'/api/v1/orders/100':112 '/call':12,31 '/docs':181 '/pricing':183 '/readme':185 '0.02':11,30,98,134 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':166 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':173 '20':127 '402':122 'access':118,148 'across':58 'actual':214,229 'address':164 'advertis':139 'ai':15,34,68 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':72 'analyt':62 'api':5,24,45,117,141 'asset':170 'base':8,27,106,129,136,175 'base usdc api' 'broad':50 'catalog':51 'categori':60,220 'challeng':123 'classif':75 'connect':191 'content':197 'contract':171 'convers':91 'conversion' 'crypto-gas' 'data':14,33,61,65 'data-analytics' 'describ':114 'document':176,206 'embed':76 'embeddings api' 'enabl':44 'endpoint':19,38,57,94,110,213,217 'entir':152 'estim':86 'exampl':209 'exchang':81 'exchange-rates' 'export':66 'extrem':178 'feed':80 'financ':16,35,77 'finance-prices' 'format':233 'four':59 'function':230 'gas':85 'generat':92 'geocod':89 'geocoding' 'geocoding api' 'handl':151 'header':161 'i.e':133 'infrastructure/utilities':88 'insight':67 'instant':147 'key':142 'land':225 'learn':70 'limit':145 'list':222 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'metric':63 'micropayment api' 'name':218 'network':107 'offer':48 'openapi':201 'page':186,226 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':149,160,163 'per':3,22,55,99 'platform':6,25,46,138 'premium':116 'price':79,96 'prompt':193 'protocol':156 'quot':84 'rate':82,144 'render':188 'report':64 'request':4,23,56,100,124 'request/response':204 'respons':232 'return':120,215 'schema':205 'sentiment':71 'sentiment analysis api' 'settl':101 'spars':179 'spec':202 'specif':109 'summar':74 'text':73 'text summarization api' 'token':83 'unit':130 'unknown':235 'usdc':103,132,169 'usdc-base' 'util':18,37 'valid':90 'validation' 'via':9,28 'wallet':192 'web3':78 'x':159 'x-payment':158 'x402':10,29,43,155 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3451f5d5-da03-4ef4-993a-e5f84ebf4e25","listingId":"745631a3-c2e7-4f42-a13f-778f9dbde6ee","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/100","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:22.828Z"}],"sources":[{"listingId":"745631a3-c2e7-4f42-a13f-778f9dbde6ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/100","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:22.828Z","lastSeenAt":"2026-04-23T00:31:09.587Z"}],"details":{"listingId":"745631a3-c2e7-4f42-a13f-778f9dbde6ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/100 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/100"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/100"},{"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) on a per-call basis without API keys","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion with micropayments","Exporting data or generating analytics reports via pay-per-request model"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","Use cases requiring small, infrequent API calls where subscriptions are wasteful","Crypto-native workflows that can settle USDC on Base"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, schemas, or SLAs before integrating","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.846Z"},"updatedAt":"2026-04-23T00:31:09.587Z"}}