{"id":"de4b9ef4-ca92-4cc7-8f5b-6e2a3588408a","shortId":"h8YQ2y","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/cards/30` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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 uniformly priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 description of what the `/api/v1/cards/30` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides or what POST body it expects.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","post-endpoint","json-response"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-call API","USDC API access","Base network API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","No OpenAPI or schema provided; request body format and response structure are completely unknown.","The purpose of the specific endpoint /api/v1/cards/30 ('Premium API Access') is undocumented and unclear.","The platform lists many endpoint categories (AI, finance, data, infra) but provides no evidence any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/30","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/cards/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it exists and accepts USDC on Base. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/cards/30 actually returns. This is effectively a stub 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'/api/v1/cards/30':66,203 '/docs':172 '/pricing':173 '/readme':176 '/request':17,34 '0.02':16,33,75,164 '000':79 '20':78 '402':215 '6':85 'Base network API' 'USDC API access' 'access':45,72,229 'account':98 'actual':205 'advertis':120 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,71,96,124,228 'attach':106 'base':7,24,61,80 'behind':51 'bodi':234 'broader':118 'call':77 'caller':104 'categori':122 'challeng':216 'classif':139 'confirm':210 'connect':182 'content':188 'convers':156 'cost':74 'data':9,26,125,129,224 'decim':86 'descript':199 'document':167,219 'embed':140 'endpoint':14,31,50,65,159,204,208 'estim':150 'exact':93 'exampl':196 'exchang':145 'expect':236 'export':130 'extrem':169 'feed':144 'financ':11,28,141 'four':121 'function':226 'gas':149 'gate':3,20,44 'generat':157 'geocod':154 'handl':89 'header':111 'infrastructur':152 'insight':131 'json-response' 'key':97 'learn':134 'limit':101 'list':68 'live':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'marketplac':42 'metric':127 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':192 'page':177 'pay-per-call API' 'payment':87,110,115 'per':53,76,165 'per-request':52 'per-request-micropayment' 'platform':5,22,119 'post':233 'post-endpoint' 'premium':70,227 'price':143,162 'prompt':184 'proof':116 'proper':214 'protocol':40 'provid':230 'quot':148 'rate':100,146 'render':179 'report':128 'request':54,166 'request/response':195 'requir':103 'return':206,212 'schema':193 'scheme':94 'sentiment':135 'settl':56 'simpli':105 'spars':170 'specif':64 'summar':138 'text':137 'token':147 'unclear':222 'uniform':161 'unit':81 'usdc':58,83 'usdc-base' 'util':13,30,153 'valid':114,155 'varieti':48 'via':90 'wallet':183 'web3':142 'without':218 'x':109 'x-payment':108 'x402':2,19,39,92 'x402 API marketplace' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"cf5ce342-2de9-4abb-bd93-ea188c89b9a6","listingId":"de4b9ef4-ca92-4cc7-8f5b-6e2a3588408a","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/cards/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:28.594Z"}],"sources":[{"listingId":"de4b9ef4-ca92-4cc7-8f5b-6e2a3588408a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:28.594Z","lastSeenAt":"2026-04-22T10:31:28.427Z"}],"details":{"listingId":"de4b9ef4-ca92-4cc7-8f5b-6e2a3588408a","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Attach a valid X-PAYMENT header (x402 exact scheme, USDC on Base) to pay $0.02.\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/30 \\\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 with maxAmountRequired of 20000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/30"},{"claim":"All 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 APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Exploring x402 protocol integration for pay-as-you-go services"],"bestFor":["Developers experimenting with x402 micropayment protocol","AI agents that need keyless, pay-per-request API access","Users who want to avoid subscriptions and pay only per call"],"notFor":["Production workloads requiring documented, well-specified API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.143Z"},"updatedAt":"2026-04-22T10:31:28.427Z"}}