{"id":"2426608f-d304-4891-a010-8e143a7b573c","shortId":"VuKyhW","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site advertises a broad catalog of pay-per-call APIs spanning data & analytics, 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 instant access.\n\nThe specific endpoint probed (/api/v1/charges/336) is labeled \"Premium API Access\" and returns a valid x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) — which equals $0.02 per call. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. It is unclear what specific data or functionality this particular charge endpoint returns, as the description is generic. The site appears to be a demonstration or early-stage x402 API marketplace rather than a mature, well-documented service.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","http-post","json-response"],"categories":["api-marketplace","x402"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No documentation available; /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific functionality behind /api/v1/charges/336 is unknown — 'Premium API Access' is a generic label","Site may be a demo or early-stage project; maturity and reliability are uncertain"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/336","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/336","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, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific endpoint (/api/v1/charges/336) is unclear beyond the generic label 'Premium API 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'/api/v1/charges/336':108 '/docs':171 '/pricing':173 '/readme':175 '0.02':91,137 '000':124 '0x8335':129 '20':123 '2913':130 '300':155 '6':133 'Base network API' 'USDC API' 'accept':160 'access':6,20,36,103,113 'address':152 'advertis':47 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,96,112,234 'appear':224 'application/json':165 'avail':200 'base':8,22,43,125,132 'behind':37 'broad':49 'call':55,139 'catalog':50 'challeng':119 'charg':214 'classif':67 'connect':181 'content':187 'convers':84 'crawl':203 'data':58,209 'decim':134 'demonstr':228 'descript':219 'document':166,242 'earli':231 'early-stag':230 'embed':68 'endpoint':30,87,106,159,215 'equal':136 'estim':78 'exact':146 'exampl':199 'exchang':73 'extrem':168 'feed':72 'financ':69 'function':211 'gas':77 'gate':3,17 'generat':85 'generic':221 'geocod':82 'http':161 'http-post' 'infrastructur':80 'instant':102 'json-response' 'key':97 'label':110 'learn':62 'limit':100 'list':89 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':142 'marketplac':235 'matur':239 'micropayment API' 'network':44 'no-api-key' 'openapi':191 'page':176 'paid':9,23 'particular':213 'pay':53 'pay-per-cal':52 'pay-per-call API' 'payment':140 'payto':151 'paywal':40 'per':11,25,54,92,138 'per-request':10,24 'per-request-billing' 'post':162 'premium':4,18,34,111 'price':71 'probe':107 'prompt':183 'provid':33 'quot':76 'rate':74,99 'rather':236 'render':178 'request':12,26,93,120 'request/response':194 'return':115,164,216 'schema':195 'scheme':147 'second':156 'sentiment':63 'servic':243 'site':46,223 'span':57 'spars':169 'spec':192 'specif':105,208 'specifi':150 'stage':232 'summar':66 'text':65 'timeout':157 'token':75 'unclear':206 'unit':126 'usag':198 'usdc':14,28,128 'usdc-base' 'util':81 'valid':83,117 'via':143 'wallet':182 'web3':70 'well':241 'well-docu':240 'x402':2,16,39,118,145,233 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"2dd929b9-f739-4019-94fc-c99b63e72082","listingId":"2426608f-d304-4891-a010-8e143a7b573c","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/336","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:10.890Z"}],"sources":[{"listingId":"2426608f-d304-4891-a010-8e143a7b573c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/336","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:10.890Z","lastSeenAt":"2026-04-23T01:01:23.912Z"}],"details":{"listingId":"2426608f-d304-4891-a010-8e143a7b573c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/336 \\\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 site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/336"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Programmatic agent-driven access to paid endpoints using x402 USDC payments on Base","Exploring x402 protocol integration for pay-as-you-go API consumption"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring well-documented, stable APIs with SLAs","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":"2026-02-17T23:14:22.277Z"},"updatedAt":"2026-04-23T01:01:23.912Z"}}