{"id":"91422722-d47a-4bdc-96f5-24b394384905","shortId":"Nrxp2T","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 marketplace offering a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required. The specific endpoint at `/api/v1/policies/87` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call.\n\nThe platform advertises four broad categories of APIs: 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 appear to share the same $0.02/request pricing. Payment is settled on-chain via the x402 protocol using USDC at contract address 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 schema, no request/response examples, and no detailed documentation for any individual endpoint. The specific functionality behind `/api/v1/policies/87` (\"Premium API Access\") is not described beyond its title, so its actual behavior is unknown.","tags":[],"capabilities":["x402-payment","per-request-pricing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The specific behavior and expected input/output of /api/v1/policies/87 ('Premium API Access') is entirely undocumented","No OpenAPI schema or request/response examples are provided for any endpoint","All non-root pages appear to require wallet connection to view, so documentation may be gated"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/87","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/policies/87","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 challenge, confirming it accepts USDC payments on Base. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a title. The actual functionality of the /policies/87 endpoint is completely undescribed, making this effectively a stub 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'/api/v1/policies/87':82,218 '/call':13,28 '/docs':181 '/pricing':183 '/readme':185 '/request':156 '0.02':12,27,104,155 '000':98 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':173 '20':97 'Base network API' 'USDC API' 'access':88,221 'across':44 'actual':230 'address':172 'advertis':109 'ai':122 'ai-inference' 'ai/ml':47 'analysi':126 'analyt':46,116 'api':5,20,37,68,87,114,220 'appear':150 'base':8,23,64,99,175 'behavior':231 'behind':217 'beyond':225 'broad':111 'call':106 'categori':112 'chain':163 'challeng':93 'classif':129 'classification' 'commit':76 'connect':191 'content':197 'contract':171 'convers':146 'crypto API access' 'data':45,115,119 'data-analytics' 'describ':224 'detail':208 'document':176,209 'embed':130 'embeddings' 'enabl':36 'endpoint':43,54,80,149,213 'estim':140 'exampl':205 'exchang':135 'export':120 'extrem':178 'feed':134 'financ':131 'finance-data' 'finance/web3':49 'four':110 'function':216 'gas':139 'generat':147 'geocod':144 'geocoding' 'i.e':103 'individu':212 'infer':48 'infrastructur':51,142 'insight':121 'key':69 'learn':124 'limit':72 'list':84 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'marketplac':38 'metric':117 'micropayment API' 'minimum':75 'network':9,24,65 'no-api-key' 'offer':39 'on-chain':161 'openapi':201 'page':186 'paid':56 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payment':158 'per':3,18,58,105 'per-request':57 'per-request-pricing' 'platform':6,21,108 'premium':86,219 'price':133,157 'prompt':193 'protocol':167 'quot':138 'rate':71,136 'render':188 'report':118 'request':4,19,59,94 'request/response':204 'requir':77 'return':90 'schema':202 'sentiment':125 'sentiment-analysis' 'settl':160 'share':152 'spars':179 'specif':79,215 'summar':128 'text':127 'text-summarization' 'titl':227 'token':137 'unit':100 'unknown':233 'usdc':15,30,61,102,169 'usdc-base-network' 'use':60,168 'util':52,143 'valid':145 'varieti':41 'via':10,25,164 'wallet':192 'web3':132 'x402':11,26,35,92,166 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e239686a-8137-4fa8-9142-b1d4f98873e0","listingId":"91422722-d47a-4bdc-96f5-24b394384905","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/policies/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:03.272Z"}],"sources":[{"listingId":"91422722-d47a-4bdc-96f5-24b394384905","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:03.272Z","lastSeenAt":"2026-04-22T15:01:44.828Z"}],"details":{"listingId":"91422722-d47a-4bdc-96f5-24b394384905","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/87 \\\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 are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/policies/87 requests maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/87"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/87"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request crypto micropayments","Using utility services like geocoding, validation, and conversion via x402 payments"],"bestFor":["Developers wanting instant API access without registration or API keys","Agents and bots that can settle USDC payments on Base via x402","Low-volume or sporadic API usage where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas and error handling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.321Z"},"updatedAt":"2026-04-22T15:01:44.828Z"}}