{"id":"591028f0-0a1d-4da6-8645-8f790aa0c92b","shortId":"6ApDLE","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/charges/181` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call, settled on-chain to a designated wallet address. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform organizes its endpoints into 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/request pricing. However, the specific endpoint being listed here (`/api/v1/charges/181`) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live via a valid 402 challenge response, but the actual behavior behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The specific functionality behind 'Premium API Access' at /api/v1/charges/181 is completely undocumented","No OpenAPI spec or request/response schema provided","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/181","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/charges/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what 'Premium API Access' actually returns. The docs pages are all empty wallet-connect 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'/api/v1/charges/181':62,177 '/docs':201 '/pricing':203 '/readme':205 '/request':17,34,168 '0.02':16,33,81,167 '000':76 '20':75 '402':243 'Base network API' 'USDC API' 'access':67,105,184 'actual':248 'address':93 'advertis':96 'ai':10,27,136 'analysi':140 'analyt':130 'api':4,21,40,66,98,183 'attach':108 'avail':231 'base':7,24,56,77 'base-network' 'behavior':249 'behind':48,250 'broader':121 'call':84 'caller':106 'categori':128 'chain':88 'challeng':244 'classif':143 'confirm':238 'connect':211 'content':217 'convers':159 'crawl':234 'data':9,26,129,133,191 'describ':179 'design':91 'document':188,196,226 'embed':144 'endpoint':14,31,47,60,125,163,173,236 'estim':154 'exampl':230 'exchang':149 'export':134 'extrem':198 'feed':148 'financ':11,28,145 'four':127 'function':193 'gas':153 'gate':3,20,43 'generat':160 'geocod':157 'header':113 'howev':170 'infrastructure/utilities':156 'insight':135 'instant':104 'json-response' 'key':99 'label':64 'learn':138 'limit':102 'list':162,175 'live':239 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':137 'marketplac':41 'metric':131 'micropay':53 'micropayment API' 'network':57 'no-api-key' 'offer':8,25 'on-chain':86 'openapi':221 'organ':123 'page':206 'pay-per-request API' 'payment':71,112,118 'paywal':252 'per':50,83 'per-request':49 'per-request-billing' 'platform':5,22,95,122 'premium':65,182 'price':147,169 'prompt':213 'proof':119 'protocol':39 'quot':152 'rate':101,150 'render':208 'report':132 'request':51 'request/response':224 'requir':69 'respons':245 'return':195 'schema':225 'sentiment':139 'settl':85 'share':164 'simpli':107 'spars':199 'spec':222 'specif':59,172 'substant':216 'summar':142 'text':141 'token':151 'unit':78 'unknown':254 'usag':229 'usd':82 'usdc':52,80 'usdc-micropayment' 'util':13,30 'valid':116,158,242 'varieti':45 'via':240 'wallet':92,212 'web3':146 'x':111 'x-payment':110 'x402':2,19,38,117 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1c3555cd-3561-49aa-9e4b-1a14b91d45ef","listingId":"591028f0-0a1d-4da6-8645-8f790aa0c92b","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/charges/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:22.469Z"}],"sources":[{"listingId":"591028f0-0a1d-4da6-8645-8f790aa0c92b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:22.469Z","lastSeenAt":"2026-04-23T01:01:21.876Z"}],"details":{"listingId":"591028f0-0a1d-4da6-8645-8f790aa0c92b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/181 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/181"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API services without API key registration","Making micropayment-gated requests using USDC on Base","Agent-driven API consumption with on-chain payment settlement"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.57Z"},"updatedAt":"2026-04-23T01:01:21.876Z"}}