{"id":"2376f6bc-b67a-496b-b2f7-e64eec5a7791","shortId":"up6NRr","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). Each endpoint is priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific resource `/api/v1/generate/resource/119` is labeled \"Premium API Access\" without further documentation on what it returns. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available. The exact functionality behind resource/119 is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","USDC pay-per-call","Base network API","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","The exact functionality of /api/v1/generate/resource/119 ('Premium API Access') is unknown; no input or output schema is provided.","The site lists many endpoints but none have documented request/response formats.","Cannot verify what data or service is returned after payment."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/119","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/generate/resource/119","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 challenge, but there is zero documentation on what this specific resource does, no request/response schema, and no examples. The docs pages are empty. The listing is effectively a stub with confirmed liveness and 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'/api/v1/generate/resource/119':101 '/docs':169 '/pricing':170 '/readme':173 '/request':13,28 '0.02':12,27,88,138 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':132 'Base network API' 'USDC pay-per-call' 'accept':122 'access':7,22,38,106,158 'addit':184 'address':146 'advertis':157 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,151 'avail':199,209 'base':9,24,96,134,149 'behind':203 'broad':48 'call':4,19,141 'catalog':49 'challeng':116 'classif':64 'confirm':117 'connect':179 'convers':81 'data':57 'detail':186 'document':109,164 'embed':65 'endpoint':32,84,119 'estim':75 'exact':201 'exampl':198 'exchang':70 'extrem':166 'feed':69 'financ':66 'function':202 'gas':74 'gate':160 'generat':82 'geocod':79 'host':46 'infer':60 'infrastructur':77 'json-response' 'key':152 'label':103 'limit':155 'live':121 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'made':144 'materi':210 'micropay':163 'network':97 'no-api-key' 'openapi':190 'page':174 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payment':42,128,142 'per':3,18,53,89,140 'post':123 'post-endpoint' 'premium':5,20,36,104 'premium API access' 'price':68,86 'prompt':181 'protocol':43 'provid':35 'pure':161 'quot':73 'rate':71,154 'render':176 'request':54,90,124 'request/response':193 'requir':126 'resourc':100 'resource/119':204 'return':113 'schema':194 'sentiment':61 'settl':91 'site':45 'span':56 'spars':167 'spec':191 'specif':99 'summar':63 'technic':185 'token':72 'unclear':206 'unit':135 'usag':197 'usd':139 'usdc':15,30,93,137 'usdc-base' 'util':78 'valid':80 'via':10,25,39 'wallet':180 'web3':67 'without':107 'x402':11,26,41,115 'x402 micropayment API' 'x402-payment'","prices":[{"id":"88a620a3-d080-46ed-a7af-7f7d7dfa6e45","listingId":"2376f6bc-b67a-496b-b2f7-e64eec5a7791","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/generate/resource/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:25.558Z"}],"sources":[{"listingId":"2376f6bc-b67a-496b-b2f7-e64eec5a7791","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:25.558Z","lastSeenAt":"2026-04-24T10:32:14.436Z"}],"details":{"listingId":"2376f6bc-b67a-496b-b2f7-e64eec5a7791","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/119 \\\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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/119"},{"claim":"Price is $0.02 per request, paid in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/119"},{"claim":"maxAmountRequired is 20000 base units (0.02 USDC with 6 decimals)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/119"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","AI agents that need keyless, on-demand API access settled in crypto","Low-volume, pay-as-you-go API consumption without commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement adds overhead","Anyone who needs to know exactly what the endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.962Z"},"updatedAt":"2026-04-24T10:32:14.436Z"}}