{"id":"b4ac699e-8cc3-49cb-a665-56d4a69d380b","shortId":"gVpzPm","kind":"x402","title":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — analytics, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is a multi-category API platform that accepts x402 micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/orders/5` is labeled \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each POST request.\n\nThe broader site offers 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 listed endpoints share the same $0.02 per-request pricing.\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 `/api/v1/orders/5` endpoint itself is live and returns a valid x402 402 challenge, confirming it accepts POST requests and pays out to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC on Base.","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","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-call API","USDC API","Base network API","micropayment endpoints"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/orders/5 has no documented purpose; 'Premium API Access' is vague","The broader platform lists many endpoints but none have documented input/output schemas","Cannot verify that the advertised AI, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/5","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/5","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, but documentation is essentially nonexistent — every doc/pricing/README page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific '/api/v1/orders/5' endpoint is unclear beyond its 'Premium API Access' label. Pricing is clear but everything else must be 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'/call':19,38 '0.02':18,37,71,153 '000':75 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':221 '20':74 '402':209 '6':81 'Base network API' 'USDC API' 'accept':48,213 'access':66,94 'across':111 'address':220 'advertis':85 'ai':12,31,121 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'analysi':125 'analyt':11,30,115 'api':5,24,45,65,87,164 'attach':97 'avail':194 'base':8,27,56,76,225 'broader':107 'caller':95 'categori':44,113 'challeng':210 'classif':128 'confirm':211 'connect':173 'convers':145 'conversion' 'cost':68 'crawl':197 'crypto-gas' 'data':114,118 'data-analytics' 'decim':82 'detail':180 'doc':163 'document':158,189 'embed':129 'endpoint':16,35,60,110,149,200 'estim':139 'exampl':193 'exchang':134 'exchange-rates' 'export':119 'extrem':160 'feed':133 'financ':13,32,130 'finance-prices' 'four':112 'gas':138 'generat':146 'geocod':143 'geocoding' 'header':101 'infrastructur':141 'insight':120 'instant':93 'key':88 'label':63 'learn':123 'limit':91 'list':148 'live':203 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':122 'metric':116 'micropay':50 'micropayment endpoints' 'multi':43 'multi-categori':42 'network':57 'offer':109 'openapi':184 'page':168 'pay':2,21,217 'pay-per-call API' 'pay-per-request':1,20 'payment':100 'per':3,22,72,155 'per-request':154 'platform':46,84 'post':104,214 'premium':64 'price':132,157,165 'prompt':175 'quot':137 'rate':90,135 'readm':167 'render':170 'report':117 'request':4,23,73,105,156,215 'request/response':187 'return':205 'schema':188 'sentiment':124 'settl':51 'share':150 'simpli':96 'site':108 'spars':161 'spec':185 'specif':59 'suit':6,25 'summar':127 'technic':179 'text':126 'token':136 'unit':77 'usag':192 'usdc':53,79,223 'usdc-base' 'util':15,34,142 'valid':144,207 'validation' 'via':9,28 'wallet':174 'web3':131 'x402':10,29,49,99,208 'x402 micropayment API' 'x402-payment'","prices":[{"id":"bf6eb27d-8bd3-4e5e-b261-1e02d03ceeac","listingId":"b4ac699e-8cc3-49cb-a665-56d4a69d380b","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:02.529Z"}],"sources":[{"listingId":"b4ac699e-8cc3-49cb-a665-56d4a69d380b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:02.529Z","lastSeenAt":"2026-04-22T20:00:42.726Z"}],"details":{"listingId":"b4ac699e-8cc3-49cb-a665-56d4a69d380b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/5 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/5"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/5"},{"claim":"All listed 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"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates via micropayment","Running geocoding or data validation as a lightweight utility call","Integrating pay-per-use analytics and reporting into agent workflows"],"bestFor":["Agents or apps that need keyless, pay-per-request API access","Developers wanting to avoid subscription commitments for occasional API calls","x402-compatible wallets and agent frameworks on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Non-crypto users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.144Z"},"updatedAt":"2026-04-22T20:00:42.726Z"}}