{"id":"9ab61791-2aac-4595-bba4-86b052822727","shortId":"vNrZq2","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","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 paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint probed (/api/v1/orders/42) is labeled \"Premium API Access\" and accepts POST requests. It charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The site advertises a uniform $0.02/request price across all listed endpoints. Categories of available APIs include: metrics, reports, data export, insights (Data & Analytics); sentiment analysis, text summarization, classification, embeddings (AI & ML); price feeds, exchange rates, token quotes, gas estimates (Finance & Web3); and geocoding, validation, conversion, generation (Infrastructure).\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation it is unclear what request body the POST expects or what the response payload looks like.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API marketplace"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific endpoint /api/v1/orders/42 is not listed among the advertised APIs on the homepage; its exact function is unclear","Request and response formats are entirely undocumented; example_request_json and example_response_json cannot be provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/42","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/42","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 ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of /api/v1/orders/42 specifically is unclear beyond the generic label 'Premium API Access'. The broad catalog of endpoints is listed on the homepage but none have documented 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'/api/v1/orders/42':94 '/call':19,38 '/docs':180 '/pricing':182 '/readme':184 '/request':133 '0.02':18,37,120,132 '000':109 '0x8335':114 '20':108 '2913':115 '402':224 '6':125 'Base network API' 'USDC micropayment API' 'accept':101 'access':99 'across':135 'advertis':129 'ai':12,31,157 'ai-inference' 'ai/ml':57 'analysi':152 'analyt':56,150 'api':5,24,45,80,98,142 'avail':141,211 'base':8,27,76,110,117 'bodi':234 'broad':50 'call':122 'categori':139 'challeng':225 'charg':105 'classif':155 'collect':51 'commit':88 'confirm':218 'connect':190 'convers':172 'conversion' 'crawl':214 'crypto-paid API' 'crypto-quotes' 'data':11,30,55,60,146,149 'data-analytics' 'decim':126 'detail':197 'document':175,206,228 'embed':156 'embeddings' 'enabl':44 'endpoint':16,35,53,66,92,138,216 'equal':119 'estim':166 'exampl':210 'exchang':161 'expect':237 'export':147 'extrem':177 'feed':160 'financ':13,32,167 'finance-data' 'finance/web3':59 'gas':165 'gas-estimates' 'general':62 'generat':173 'geocod':170 'geocoding' 'includ':143 'infer':58 'infrastructur':174 'insight':148 'key':81 'label':96 'like':244 'limit':84 'list':137 'live':219 'look':243 'low fee API' 'lowpaymentfee.com':39 'metric':144 'minimum':87 'ml':158 'network':77 'offer':48 'openapi':201 'page':185 'paid':68 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'payload':242 'per':3,22,70,121 'per-request':69 'per-request-billing' 'platform':46 'post':102,236 'premium':97 'price':134,159 'probe':93 'prompt':192 'quot':164 'rate':83,162 'render':187 'report':145 'request':4,23,71,103,233 'request/response':204 'requir':89 'respons':241 'return':220 'schema':205 'sentiment':151 'sentiment-analysis' 'serverless API marketplace' 'servic':64 'site':128 'span':54 'spars':178 'spec':202 'specif':91 'suit':6,25 'summar':154 'technic':196 'text':153 'text-classification' 'text-summarization' 'token':163 'unclear':231 'uniform':131 'unit':111 'usag':209 'usdc':73,113,123 'usdc-base' 'use':72,124 'util':15,34,63 'valid':171,222 'validation' 'via':9,28 'wallet':191 'web3':168 'without':227 'x402':10,29,43,223 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8451ba57-2253-45b7-b7f5-5869a37e92aa","listingId":"9ab61791-2aac-4595-bba4-86b052822727","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:04.317Z"}],"sources":[{"listingId":"9ab61791-2aac-4595-bba4-86b052822727","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:04.317Z","lastSeenAt":"2026-04-22T20:00:42.808Z"}],"details":{"listingId":"9ab61791-2aac-4595-bba4-86b052822727","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/42 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns x402 402 challenge with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/42"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/42"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto prices, gas estimates, or exchange rates with per-call payment","Running data analytics or export tasks paid individually via USDC on Base","Geocoding, validation, or data conversion as utility microservices"],"bestFor":["AI agents or bots that need keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","Web3-native applications already operating on the Base network"],"notFor":["High-volume production workloads where per-call pricing becomes expensive compared to subscription plans","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without access to USDC on Base for payment"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.082Z"},"updatedAt":"2026-04-22T20:00:42.808Z"}}