{"id":"fe2a3c01-bce0-47a1-8638-09658ccb7eb4","shortId":"TjsjQL","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/81` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns `application/json`. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export, all at the same $0.02 price point.\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. The exact functionality behind the `/api/v1/orders/81` path is unclear; the generic \"Premium API Access\" label does not describe what data or service it provides. Prospective callers should be aware that without documented input/output schemas, integration requires experimentation or contacting the provider directly.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose of /api/v1/orders/81 ('Premium API Access') is undocumented and unclear","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts payments. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no description of what '/api/v1/orders/81' actually returns. The listing is effectively a 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'/api/v1/orders/81':94,207 '/call':13,28 '/docs':171 '/pricing':172 '/readme':175 '0.02':12,27,62,121,163 '000':110 '0x8335':115 '20':109 '2913':116 '402':104 '6':125 'Base network API' 'USDC API' 'accept':129 'access':100,215 'account':74 'across':45 'advertis':138 'ai/ml':48 'analysi':142 'analyt':47 'api':5,20,37,72,99,214 'application/json':134 'attach':82 'avail':201 'awar':230 'base':8,23,69,111,118 'base-network' 'behind':205 'broader':136 'caller':80,227 'challeng':105 'classif':145 'connect':181 'contact':240 'content':187 'convers':155 'crypto-paid API' 'data':46,157,221 'decim':126 'describ':219 'direct':243 'document':166,196,233 'embed':146 'enabl':36 'endpoint':44,55,92,128,139 'equal':120 'estim':152 'exact':203 'exampl':200 'exchang':149 'experiment':238 'export':158 'extrem':168 'feed':148 'finance/web3':50 'function':204 'gas':151 'generic':212 'geocod':153 'given':122 'header':86 'infer':49 'infrastructur':52 'input/output':234 'integr':236 'json-api' 'key':73 'label':216 'limit':77 'list':96 'lowpaymentfee' 'lowpaymentfee.com':31 'micropayment API' 'network':9,24,70 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':191 'page':176 'path':208 'pay':2,17,58 'pay-per-call API' 'pay-per-request':1,16,57 'payment':85 'per':3,18,59 'platform':6,21,38,137 'point':165 'post':130 'premium':98,213 'price':147,164 'prompt':183 'prospect':226 'provid':225,242 'rate':76,150 'render':178 'request':4,19,60,89,106,131 'request/response':194 'requir':79,237 'return':102,133 'schema':195,235 'sentiment':141 'servic':223 'settl':64 'simpli':81 'spars':169 'spec':192 'specif':91 'summar':144 'text':143 'unclear':210 'unit':112 'usag':199 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'valid':154 'varieti':42 'via':10,25 'wallet':182 'without':232 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e32b71f4-14df-4e4e-a112-a236f442d6a1","listingId":"fe2a3c01-bce0-47a1-8638-09658ccb7eb4","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:48.801Z"}],"sources":[{"listingId":"fe2a3c01-bce0-47a1-8638-09658ccb7eb4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:48.801Z","lastSeenAt":"2026-04-25T04:31:59.966Z"}],"details":{"listingId":"fe2a3c01-bce0-47a1-8638-09658ccb7eb4","quickStartSnippet":"# POST with x402 payment header (pseudo-example)\ncurl -X POST https://lowpaymentfee.com/api/v1/orders/81 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/orders/81"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/81"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing API services without creating accounts or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-request access"],"bestFor":["Developers who want zero-signup API access via crypto payments","AI agents that can autonomously pay for API calls using x402","Users already on the Base network with USDC who want low-friction API consumption"],"notFor":["Teams needing well-documented APIs with full OpenAPI specs and examples","Users without USDC on Base network or unfamiliar with x402 protocol","Production systems requiring guaranteed SLAs and support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.677Z"},"updatedAt":"2026-04-25T04:31:59.966Z"}}