{"id":"b5db1e6c-e20c-4c71-806f-e03c4a2ec9b9","shortId":"aaspng","kind":"x402","title":"Pay-per-call API key endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/apikeys/72` appears to be one entry point in a broader platform that offers a variety of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per call.\n\nPayment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 \"exact\" scheme. The endpoint returned a valid 402 challenge with `maxAmountRequired` of 20000 base units, which at 6 decimals equals $0.02 USD. No API keys or subscriptions are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The timeout window is 300 seconds.\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 spec, no request/response schema documentation, and no examples of what the endpoint actually returns when paid. The landing page lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, but none have documented schemas. The exact purpose of `/api/v1/apikeys/72` (as distinct from the other listed endpoints) is unclear — the name suggests it may provision or return an API key.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","api-key-provisioning","no-subscription"],"categories":["infrastructure","api-access"],"synonyms":["x402 API access","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API key"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation available for any endpoint on the platform.","The exact purpose and response format of /api/v1/apikeys/72 is undocumented — the name suggests API key provisioning but this is unconfirmed.","Sibling endpoints listed on the landing page (AI, finance, utils) are not verified to be live or functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/72","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/apikeys/72","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 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The exact function of this specific endpoint (/api/v1/apikeys/72) is 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'/api/v1/apikeys/72':49,222 '/docs':156 '/pricing':157 '/readme':160 '0.02':12,28,84,122 '0x8335':97 '20000':114 '2913':98 '300':149 '402':109 '6':119 'Base network API' 'USDC micropayment API' 'access':40 'actual':189 'ai/ml':73 'analysi':201 'analyt':72 'api':5,21,39,69,125,241 'api-key-provisioning' 'appear':50 'attach':133 'base':9,25,92,115 'broader':58 'call':4,20,86 'caller':131 'challeng':110 'classif':204 'connect':166 'content':172 'contract':96 'data':71,77 'decim':120 'distinct':224 'document':151,181,216 'embed':205 'endpoint':7,23,34,105,188,198,229 'entri':54 'equal':121 'exact':102,219 'exampl':184 'exchang':208 'extrem':153 'feed':207 'financ':75 'geocod':210 'header':138 'infer':74 'infrastructur':79 'key':6,22,126,242 'land':194 'list':196,228 'lowpaymentfee' 'lowpaymentfee.com':36 'maxamountrequir':112 'may':236 'name':233 'network':93 'no-subscription' 'none':214 'offer':61 'one':53 'openapi':176 'page':161,195 'paid':192 'pay':2,18,66 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':65 'payment':44,87,137,143 'per':3,13,19,29,67,85 'platform':59 'point':55 'premium':38 'premium API key' 'price':82,206 'prompt':168 'proof':144 'protocol':45 'provid':37 'provis':237 'purpos':220 'rate':209 'render':163 'request':14,30,68 'request/response':179 'requir':130 'resourc':48 'return':106,190,239 'schema':180,217 'scheme':103 'second':150 'sentiment':200 'settl':89 'sibl':197 'simpli':132 'span':70 'spars':154 'spec':177 'specif':47 'subscript':128 'suggest':234 'summar':203 'text':202 'timeout':146 'unclear':231 'unit':116 'usd':123 'usdc':16,32,95 'usdc-base-network' 'use':94 'util':80 'valid':108,141 'varieti':63 'via':10,26,41 'wallet':167 'web3':76 'window':147 'x':136 'x-payment':135 'x402':11,27,43,101,142 'x402 API access' 'x402-payment'","prices":[{"id":"aa5a3983-3405-4e05-8073-8d7be292b834","listingId":"b5db1e6c-e20c-4c71-806f-e03c4a2ec9b9","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/apikeys/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:41.539Z"}],"sources":[{"listingId":"b5db1e6c-e20c-4c71-806f-e03c4a2ec9b9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:41.539Z","lastSeenAt":"2026-04-23T05:01:54.985Z"}],"details":{"listingId":"b5db1e6c-e20c-4c71-806f-e03c4a2ec9b9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/72 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/apikeys/72"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/72"}],"useCases":["Acquiring API access credentials via a single micropayment","Agent-driven pay-per-call API consumption without pre-registration","Programmatic access to a multi-category API platform using x402 payments"],"bestFor":["Agents needing instant API access without signup or API key management","Developers experimenting with x402 payment protocol integrations","Low-volume, pay-as-you-go API consumption on Base"],"notFor":["High-volume production workloads requiring SLAs or guaranteed uptime","Users who need detailed API documentation or response schema guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.573Z"},"updatedAt":"2026-04-23T05:01:54.985Z"}}