{"id":"ab9ce0f0-60b6-4e3d-bc51-07488492fa75","shortId":"GzUj8b","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, 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, settled in USDC on Base with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/26` is labeled \"Premium API Access\" in the x402 challenge. It accepts POST requests and returns application/json. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, 6 decimals), which equals $0.02. Payment is made via the x402 \"exact\" scheme to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this specific endpoint actually returns. The site's landing page lists many endpoints but provides no detail on request parameters or response formats for any of them. Without further documentation it is unclear what data or functionality the `/api/v1/charges/26` endpoint specifically provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API access","Base network API","micropayment API"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request parameters or response format","The specific functionality of /api/v1/charges/26 is undocumented and unclear","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/26","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/charges/26 ('Premium API Access') is entirely opaque. Docs pages render only 'Connect wallet' with no 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'0.02':10,24,90,148 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':159 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':143 '20':136 '300':162 '6':144 'Base network API' 'USDC API access' 'accept':123 'access':6,20,36,117 'actual':204 'addit':185 'address':158 'advertis':132 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,100,116,172 'application/json':128 'asset':142 'base':8,22,43,97,138 'base-network' 'behind':37 'broad':49 'call':55 'catalog':50 'challeng':121,131 'classif':66 'commit':107 'connect':180 'content':186 'convers':83 'data':58,235 'decim':145 'detail':217 'doc':170 'document':165,195,230 'embed':67 'endpoint':30,86,111,203,213,240 'equal':147 'estim':77 'exact':155 'exampl':198 'exchang':72 'extrem':167 'feed':71 'financ':68 'format':223 'function':237 'gas':76 'gate':3,17 'generat':84 'geocod':81 'host':47 'infrastructur':79 'json-response' 'key':101 'label':114 'land':209 'learn':62 'limit':104 'list':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':151 'mani':212 'maxamountrequir':134 'micropayment API' 'network':44 'no-api-key' 'openapi':190 'page':175,210 'paramet':220 'pay':9,23,53 'pay per call API' 'pay-per-cal':52 'pay-per-request' 'payment':149 'paywal':40 'per':11,25,54,91 'post':124 'post-method' 'premium':4,18,34,115 'price':70,88,171 'prompt':182 'provid':33,215,242 'quot':75 'rate':73,103 'readm':174 'render':177 'request':12,26,92,125,219 'request/response':193 'requir':108 'respons':222 'return':127,205 'schema':194 'scheme':156 'second':163 'sentiment':63 'settl':93 'site':46,207 'span':57 'spars':168 'spec':191 'specif':110,202,241 'summar':65 'timeout':164 'token':74 'unclear':233 'unit':139 'usdc':14,28,95,141 'usdc-settlement' 'util':80 'valid':82 'via':152 'wallet':181 'web3':69 'without':228 'x402':2,16,39,120,130,154 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2f53e018-2868-4544-802c-2e619ef8eda9","listingId":"ab9ce0f0-60b6-4e3d-bc51-07488492fa75","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:51.432Z"}],"sources":[{"listingId":"ab9ce0f0-60b6-4e3d-bc51-07488492fa75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:51.432Z","lastSeenAt":"2026-04-22T09:01:01.053Z"}],"details":{"listingId":"ab9ce0f0-60b6-4e3d-bc51-07488492fa75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/26"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/26"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go API access for prototyping or low-volume use"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.25Z"},"updatedAt":"2026-04-22T09:01:01.053Z"}}