{"id":"208285cc-dc6a-47da-b6fc-06e360829eb2","shortId":"GAQ45U","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/orders/82` is described as \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base) at a maximum cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — each call is paid individually via the X-PAYMENT header.\n\nThe broader platform advertises four categories of endpoints: 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 are priced at $0.02 per request.\n\nThe specific endpoint probed (`/api/v1/orders/82`) returned a valid 402 challenge confirming it is live. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for this endpoint and the other advertised APIs are unknown. There is no OpenAPI spec, no example payloads, and no detailed documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","geocoding","crypto-gas-estimates"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no actual content","The specific endpoint /api/v1/orders/82 has a generic description ('Premium API Access') with no detail on what it actually returns","The broader platform advertises many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/82","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/82","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 there is no OpenAPI spec, no request/response schema documentation, and all doc pages are empty stubs showing only 'Connect wallet'. The specific purpose of /api/v1/orders/82 ('Premium API Access') is vague and undocumented. Pricing is clear but everything else must be 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'/call':12,31 '0.02':11,30,89,167 '000':93 '0x8335':80 '20':92 '2913':81 '402':178 '402 payment api' '6':97 'accept':54,72 'access':70 'actual':203 'advertis':123,212 'ai':15,34,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,46,69,100,213 'avail':228 'base':8,27,59,83,94 'base network api' 'beyond':186 'broader':121 'call':110 'categori':125 'challeng':179 'classif':142 'classification' 'commit':106 'confirm':180 'connect':199 'contract':79 'convers':159 'cost':87 'crawl':231 'crypto-gas-estimates' 'data':14,33,128,132 'data-analytics' 'decim':98 'describ':66 'detail':226 'document':185,227 'embed':143 'embeddings' 'empti':192 'endpoint':19,38,63,127,163,172,208 'essenti':191 'estim':153 'exampl':222 'exchang':148 'exchange-rates' 'export':133 'feed':147 'financ':16,35,144 'finance-data' 'four':124 'gas':152 'generat':160 'geocod':157 'geocoding' 'header':119 'howev':184 'individu':113 'infrastructur':155 'insight':134 'key':101 'land':188 'learn':137 'limit':103 'list':162 'live':183 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'maximum':86 'metric':130 'micropayment api' 'network':60 'openapi':219 'page':189,196 'paid':112 'pay':2,21,43 'pay per call api' 'pay-per-request':1,20,42 'payload':223 'payment':56,76,118 'per':3,22,44,90,168 'platform':6,25,47,122 'post':73 'premium':68 'price':146,165 'probe':173 'protocol':52 'quot':151 'rate':102,149 'report':131 'request':4,23,45,74,91,169 'request/response':204 'requir':108 'return':175 'schema':205 'sentiment':138 'sentiment-analysis' 'settl':75 'show':198 'spec':220 'specif':62,171 'sub':195 'sub-pag':194 'summar':141 'text':140 'text-summarization' 'token':150 'unit':95 'unknown':215 'upfront':105 'usdc':55,78 'usdc api' 'usdc-base' 'use':49 'util':18,37,156 'valid':158,177 'via':9,28,114 'wallet':200 'web3':145 'x':117 'x-payment':116 'x402':10,29,51 'x402 api' 'x402-payment'","prices":[{"id":"bad3a67c-c2b2-4353-bb8b-d7b452d17e17","listingId":"208285cc-dc6a-47da-b6fc-06e360829eb2","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:21.021Z"}],"sources":[{"listingId":"208285cc-dc6a-47da-b6fc-06e360829eb2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:21.021Z","lastSeenAt":"2026-04-23T20:01:38.595Z"}],"details":{"listingId":"208285cc-dc6a-47da-b6fc-06e360829eb2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/82 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/82"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/82"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four categories of endpoints are advertised: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or apps that need low-friction, keyless API access paid per request","Developers wanting to avoid subscription commitments for occasional API calls","Web3-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume use cases where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, OpenAPI specs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.956Z"},"updatedAt":"2026-04-23T20:01:38.595Z"}}