{"id":"64286ca2-5bdc-4af0-b610-395258fe6b88","shortId":"QGWcJQ","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 offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/orders/13` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The maximum amount required is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe broader platform advertises four 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 are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 available from the crawl. The exact functionality behind the `/api/v1/orders/13` endpoint is unclear beyond its \"Premium API Access\" label, and the input/output schemas are not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","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","micropayment api","base usdc api","lowpaymentfee"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific purpose and expected input/output of /api/v1/orders/13 ('Premium API Access') is undocumented","No request or response examples available anywhere in the crawl","The breadth of advertised capabilities (AI, finance, analytics, utilities) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/13","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/13","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 schema, no request/response examples, and the purpose of the specific /orders/13 endpoint is unclear beyond its generic label. The platform lists many endpoints but provides no detail on any of 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'/call':19,38 '0.02':18,37,99,148 '000':89 '0x8335':79 '20':88 '2913':80 '6':96 'accept':71 'access':50,69,214 'advertis':105 'ai':12,31,117 'ai-inference' 'amount':85 'analysi':121 'analyt':111 'api':5,24,48,68,109,153,169,213 'avail':197 'base':8,27,58,82,90 'base usdc api' 'base-network' 'behind':204 'beyond':210 'broader':103 'categori':107 'classif':124 'classification' 'collect':42 'commit':161 'connect':178 'content':184 'contract':78 'convers':141 'crawl':200 'data':11,30,110,114 'data-analytics' 'decim':97 'detail':195 'doc':168 'document':163,196,222 'embed':125 'embeddings' 'endpoint':16,35,49,62,144,207 'equal':98 'estim':135 'exact':202 'exampl':192 'exchang':130 'export':115 'extrem':165 'feed':129 'financ':13,32,126 'finance-data' 'four':106 'function':203 'gas':134 'generat':142 'geocod':139 'geocoding' 'infrastructur':137 'input/output':218 'insight':116 'key':154 'label':66,215 'learn':119 'limit':157 'list':146 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':118 'maximum':84 'metric':112 'micropayment api' 'minimum':160 'network':59 'no-api-key' 'offer':40 'openapi':188 'page':173 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':54,75 'per':3,22,46,100,149 'platform':104 'post':72 'premium':67,212 'price':128,170 'prompt':180 'protocol':55 'quot':133 'rate':131,156 'readm':172 'render':175 'report':113 'request':4,23,47,73,101,150 'request/response':191 'requir':86,162 'schema':189,219 'sentiment':120 'sentiment-analysis' 'settl':74 'spars':166 'specif':61 'suit':6,25 'summar':123 'text':122 'text-summarization' 'token':132 'unclear':209 'unit':91 'usdc':77,93 'usdc-settlement' 'util':15,34,138 'valid':140 'via':9,28,51 'wallet':179 'web3':127 'x402':10,29,53 'x402 api' 'x402-payment'","prices":[{"id":"1ff1e59b-a133-40d5-afd4-27234a39a6ad","listingId":"64286ca2-5bdc-4af0-b610-395258fe6b88","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:03.145Z"}],"sources":[{"listingId":"64286ca2-5bdc-4af0-b610-395258fe6b88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:03.145Z","lastSeenAt":"2026-04-22T20:00:42.761Z"}],"details":{"listingId":"64286ca2-5bdc-4af0-b610-395258fe6b88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/13 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/13"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/13"},{"claim":"All endpoints are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","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, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request billing","Using utility services like geocoding, validation, and conversion with zero commitment"],"bestFor":["Agents or developers wanting frictionless pay-per-call API access without subscriptions","Crypto-native applications that can settle USDC payments on Base","Low-volume or bursty workloads where per-request pricing is more economical than a subscription"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented, schema-validated API contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.144Z"},"updatedAt":"2026-04-22T20:00:42.761Z"}}