{"id":"c5cabcd3-96fb-439f-937e-86a089ae44fc","shortId":"dGuB9X","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of endpoints across four categories: Data & Analytics (metrics, reports, 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint being listed here (`/api/v1/carts/12`) is labeled \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README routes all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The purpose of the `/api/v1/carts/12` path specifically (as opposed to the other listed endpoints) is unclear; it may represent a shopping-cart or bundled-access resource, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","crypto-paid API","402 payment required"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no useful content beyond 'Connect wallet'","The specific purpose of /api/v1/carts/12 ('Premium API Access') is unclear — it does not match any of the documented endpoint categories","No example responses are available; response format is unknown","Cannot verify that the advertised AI/finance/utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/12","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/carts/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/carts/12 is undocumented. Most site pages return only a 'Connect wallet' 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'/api/v1/carts/12':120,218 '/docs':178 '/pricing':180 '/readme':182 '/request':17,34 '0.02':16,33,90,149 '000':138 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '0x8335':143 '20':137 '2913':144 '300':166 '402 payment required' '6':153 'Base network API' 'USDC API' 'accept':127 'access':125,240 'across':50 'addit':193 'address':162 'advertis':133 'ai':10,27,59 'ai-inference' 'analysi':63 'analyt':54 'api':4,21,41,105,124 'avail':209 'base':7,24,98,139,146 'beyond':170 'broad':46 'bundl':239 'bundled-access':238 'cart':236 'categori':52 'chain':160 'challeng':132 'classif':66 'classification' 'commit':113 'connect':188 'content':195 'convers':83 'conversion' 'crawl':212 'crypto-paid API' 'crypto-quotes' 'data':9,26,53 'data-analytics' 'decim':154 'document':169,204 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,49,86,116,227 'equal':148 'estim':77 'exampl':208 'exchang':72 'export':57 'expos':44 'extrem':175 'feed':71 'financ':11,28,68 'finance-data' 'four':51 'gas':76 'gas-estimates' 'generat':84 'geocod':81 'geocoding' 'given':150 'infrastructur':79 'insight':58 'key':106 'label':122 'land':172 'learn':61 'limit':109 'list':118,226 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'marketplac':42 'materi':213 'maxamountrequir':135 'may':231 'metric':55 'micropayment API' 'network':99 'offer':8,25 'on-chain':158 'openapi':199 'oppos':222 'page':173 'paid':93 'path':219 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'payment':155 'per':91 'platform':5,22 'post':128 'premium':123 'price':70,88 'prompt':190 'protocol':103 'purpos':215 'quot':75 'rate':73,108 'render':185 'report':56 'repres':232 'request':92,129 'request/response':202 'resourc':241 'rout':183 'schema':203 'second':167 'sentiment':62 'sentiment-analysis' 'set':47 'settl':157 'shop':235 'shopping-cart':234 'spec':200 'specif':115,220 'specul':245 'summar':65 'technic':194 'text':64 'text-summarization' 'thin':176 'timeout':168 'token':74 'unclear':229 'unit':140 'upfront':112 'usag':207 'usdc':95,142,151 'usdc-base' 'util':13,30,80 'valid':82 'validation' 'via':100 'wallet':189 'web3':69 'x402':2,19,39,102,131 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"b4a4f8eb-bb89-45a9-8f0e-7f0a845025ce","listingId":"c5cabcd3-96fb-439f-937e-86a089ae44fc","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/carts/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:35.500Z"}],"sources":[{"listingId":"c5cabcd3-96fb-439f-937e-86a089ae44fc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:35.500Z","lastSeenAt":"2026-04-23T12:05:07.879Z"}],"details":{"listingId":"c5cabcd3-96fb-439f-937e-86a089ae44fc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/12 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/carts/12","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/12"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/carts/12"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding and data validation as a utility service paid per call","Exporting analytics data or generating reports with no subscription"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-signup, pay-per-use API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who cannot transact in USDC on the Base network","Applications requiring detailed API documentation or OpenAPI specs before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.484Z"},"updatedAt":"2026-04-23T12:05:07.879Z"}}