{"id":"619557f8-4f01-4933-9c00-2a88bedf60b4","shortId":"nqkUuC","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 at `/api/v1/carts/19` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header with a signed payment to the provider's address, and the endpoint returns JSON.\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\nNote that the specific endpoint `/api/v1/carts/19` does not clearly map to any of the documented API categories — it appears to be a cart resource, which is not described on the landing page. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so details about request/response schemas, authentication flows, or the actual functionality behind this particular endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key"],"categories":["api-marketplace","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["The endpoint path /api/v1/carts/19 does not match any documented API on the landing page — its actual functionality is unknown.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The 'Premium API Access' description is generic and does not explain the endpoint's purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 challenge), but the specific resource /api/v1/carts/19 is not documented anywhere on the site. Documentation pages are empty (only showing 'Connect wallet'). No request/response schema, no examples, and no explanation of what 'Premium API Access' on a carts endpoint actually returns. Effectively a stub 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'/request':17,34 '0.02':16,33,77,164 '000':81 '20':80 '402 payment API' '6':87 'Base USDC API' 'access':44,72 'actual':235 'address':112 'advertis':121 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,40,71,125,169,194 'appear':197 'authent':231 'base':7,24,60,82 'behind':50,237 'broader':119 'call':79 'caller':97 'cart':201 'categori':123,195 'classif':140 'clear':187 'commit':177 'connect':219 'content':225 'convers':157 'cost':74 'data':9,26,126,130 'decim':88 'describ':206 'detail':227 'doc':213 'document':193,211 'embed':141 'endpoint':14,31,49,64,115,160,183,240 'estim':151 'exact':95 'exchang':146 'export':131 'feed':145 'financ':11,28,142 'flow':232 'four':122 'function':236 'gas':150 'gate':3,20,43 'generat':158 'geocod':155 'handl':91 'header':103 'includ':98 'infrastructur':153 'insight':132 'json':117 'json-response' 'key':170 'land':209 'learn':135 'limit':173 'list':68,162 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':134 'map':188 'marketplac':41 'metric':128 'micropay':54 'minimum':176 'network':61 'no-api-key' 'note':179 'offer':8,25 'page':210,212 'particular':239 'pay-per-request API' 'payment':89,102,107 'per':52,78,165 'per-request':51 'per-request-micropayment' 'platform':5,22,120 'post-method' 'premium':70 'price':144,214 'prompt':221 'protocol':39 'provid':110 'quot':149 'rate':147,172 'readm':215 'report':129 'request':53,166 'request/response':229 'requir':178 'resourc':202 'return':116,216 'schema':230 'scheme':96 'sentiment':136 'settl':55 'sign':106 'specif':63,182 'substant':224 'summar':139 'text':138 'token':148 'unit':83 'unknown':242 'usdc':57,85 'usdc-base' 'util':13,30,154 'valid':156 'varieti':47 'via':92 'wallet':220 'web3':143 'x':101 'x-payment':100 'x402':2,19,38,94 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"08e2c320-cced-4b60-b4af-b00b367871ec","listingId":"619557f8-4f01-4933-9c00-2a88bedf60b4","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:09.815Z"}],"sources":[{"listingId":"619557f8-4f01-4933-9c00-2a88bedf60b4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:09.815Z","lastSeenAt":"2026-04-22T12:03:16.306Z"}],"details":{"listingId":"619557f8-4f01-4933-9c00-2a88bedf60b4","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment.\n# First, obtain the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/19\n# Returns 402 with x402 challenge. Sign the payment for 20000 base units\n# of USDC on Base, then retry with the header:\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/19 \\\n  -H \"X-PAYMENT: <signed-payment-payload>\" \\\n  -H \"Content-Type: application/json\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/carts/19"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/19"}],"useCases":["Programmatic access to pay-per-call API endpoints without traditional API key management","Agent-driven workflows that need to purchase API access on-the-fly via x402 micropayments","Accessing data, AI inference, finance, or utility services with per-request billing on Base"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible agents that can sign USDC payments on Base","Use cases requiring no rate limits and instant access without signup"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.791Z"},"updatedAt":"2026-04-22T12:03:16.306Z"}}