{"id":"9a79241f-3c8d-40ec-9e88-bd7ed06cb711","shortId":"faPWdG","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 platform that gates a broad collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/claims/53` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment header. The 402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the `/api/v1/claims/53` path is unclear; it does not map to any of the named endpoints on the landing page, so it may be a generic or unlisted resource. Agents should be aware that without documented input/output schemas, integration requires experimentation or additional out-of-band information.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","premium API access","402 payment endpoint"],"warnings":["No OpenAPI or schema documentation available — all docs pages return only 'Connect wallet'","The path /api/v1/claims/53 does not match any named endpoint on the landing page; its exact purpose is unknown","No example request or response payloads are documented anywhere","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/53","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/claims/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is zero documentation for request/response schemas, no OpenAPI spec, and the specific /api/v1/claims/53 path is not described anywhere on the site. Effectively a stub 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'/api/v1/claims/53':63,220 '/docs':183 '/pricing':185 '/readme':187 '/request':17,34 '0.02':16,33,99,163 '000':88 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':111 '0x8335':93 '20':87 '2913':94 '300':114 '402':80 '402 payment endpoint' '6':104 'Base USDC API' 'accept':71 'access':69 'addit':260 'address':110 'advertis':120 'agent':247 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,68,124,168 'avail':214 'awar':250 'band':264 'base':7,24,58,89,96 'base-network' 'behind':50,218 'broad':46 'broader':118 'categori':122 'challeng':81 'classif':139 'collect':47 'commit':176 'connect':193 'convers':156 'cost':85 'data':9,26,125,129 'decim':105 'detail':200 'document':178,209,253 'embed':140 'endpoint':14,31,49,62,159,233 'equal':98 'estim':150 'exact':216 'exampl':212 'exchang':145 'experiment':258 'export':130 'extrem':180 'feed':144 'financ':11,28,141 'four':121 'function':217 'gas':149 'gate':3,20,44 'generat':157 'generic':243 'geocod':154 'header':78 'indic':82 'inform':265 'infrastructur':152 'input/output':254 'insight':131 'integr':256 'json-response' 'key':169 'land':236 'learn':134 'limit':172 'list':65,161 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'map':227 'maximum':84 'may':240 'metric':127 'micropay':55 'micropayment API' 'minimum':175 'name':232 'network':59 'no-api-key' 'offer':8,25 'openapi':204 'out-of-band':261 'page':188,237 'path':221 'pay-per-request API' 'payload':213 'payment':77,106 'per':52,100,164 'per-request':51 'per-request-billing' 'platform':5,22,42,119 'post':72 'post-endpoint' 'premium':67 'premium API access' 'price':143 'prompt':195 'protocol':40 'quot':148 'rate':146,171 'render':190 'report':128 'request':53,73,101,165 'request/response':207 'requir':177,257 'resourc':246 'schema':208,255 'second':115 'sent':108 'sentiment':135 'spars':181 'spec':205 'specif':61 'summar':138 'technic':199 'text':137 'timeout':116 'token':147 'unclear':223 'unit':90 'unlist':245 'usdc':54,92,102 'usdc-micropayment' 'use':103 'util':13,30,153 'valid':155 'wallet':194 'web3':142 'without':252 'x402':2,19,39,76 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e7744e2d-6035-406d-8903-a0d544e79fcd","listingId":"9a79241f-3c8d-40ec-9e88-bd7ed06cb711","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/claims/53","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:50.067Z"}],"sources":[{"listingId":"9a79241f-3c8d-40ec-9e88-bd7ed06cb711","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/53","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:50.067Z","lastSeenAt":"2026-04-24T10:32:39.972Z"}],"details":{"listingId":"9a79241f-3c8d-40ec-9e88-bd7ed06cb711","quickStartSnippet":"# POST with x402 payment header (pseudocode)\ncurl -X POST https://lowpaymentfee.com/api/v1/claims/53 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The 402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/53"},{"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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","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 gated API resources with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go data retrieval or utility calls"],"bestFor":["Agents or developers wanting keyless, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or exploratory API usage at $0.02/request"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.399Z"},"updatedAt":"2026-04-24T10:32:39.972Z"}}