{"id":"65af5ebb-1d3d-4f2b-b996-0e827b071d88","shortId":"Hjy6B7","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). All endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/257` is labeled \"Premium API Access\" and returns a live x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is made via the x402 exact scheme to the specified payTo address. No API keys are required; callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what \"Premium API Access\" actually returns. It is unclear whether this specific endpoint is a gateway to the other listed APIs or a standalone resource. Prospective callers should be aware that the actual functionality behind this endpoint is not documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","No OpenAPI or request/response schema provided","Unclear what 'Premium API Access' at /api/v1/payments/257 actually returns","The relationship between this endpoint and the other listed APIs is not documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/257","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/payments/257","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 there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually does beyond the label 'Premium API Access'. The site's docs pages are empty (wallet-connect only). Effectively a stub 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'/request':13,28 '0.02':12,27,88,123 '000':118 '20':117 '6':128 'Base network API' 'USDC micropayment API' 'accept':163 'access':7,22,38,106,205 'actual':206,234 'address':142 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,105,144,177,204,222 'application/json':168 'attach':150 'awar':231 'base':9,24,96,119 'base-network' 'behind':236 'broad':48 'call':4,19 'caller':148,228 'catalog':49 'challeng':112 'classif':64 'connect':183 'content':189 'convers':81 'crypto-paid API' 'data':57 'decim':129 'descript':200 'doc':174 'document':169,241 'embed':65 'endpoint':32,84,100,162,214,238 'estim':75 'exact':136 'exampl':197 'exchang':70 'extrem':171 'feed':69 'financ':66 'function':235 'gas':74 'gateway':217 'generat':82 'geocod':79 'header':155 'host':46 'infer':60 'infrastructur':77 'json-response' 'key':145 'label':103 'list':221 'live':110 'lowpaymentfee' 'lowpaymentfee.com':34 'made':132 'maxamountrequir':115 'network':97 'no-api-key' 'openapi':193 'page':178 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,130,154,159 'payto':141 'per':3,18,53,89 'post':164 'premium':5,20,36,104,203 'premium API access' 'price':68,86,175 'prompt':185 'proof':160 'prospect':227 'protocol':43 'provid':35 'quot':73 'rate':71 'render':180 'request':54,90,165 'request/response':196 'requir':147 'resourc':226 'return':108,167,207 'schema':194 'scheme':137 'sentiment':61 'settl':91 'simpli':149 'sinc':125 'site':45 'span':56 'spars':172 'specif':99,213 'specifi':140 'standalon':225 'summar':63 'token':72 'unclear':210 'unit':120 'usd':124 'usdc':15,30,93,122,126 'usdc-settlement' 'use':127 'util':78 'valid':80,158 'via':10,25,39,133 'wallet':184 'web3':67 'whether':211 'x':153 'x-payment':152 'x402':11,26,41,111,135 'x402 API' 'x402-payment'","prices":[{"id":"e530f44c-d42a-4009-9be0-605dde01b84d","listingId":"65af5ebb-1d3d-4f2b-b996-0e827b071d88","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/payments/257","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:06.343Z"}],"sources":[{"listingId":"65af5ebb-1d3d-4f2b-b996-0e827b071d88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/257","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:06.343Z","lastSeenAt":"2026-04-23T14:31:09.706Z"}],"details":{"listingId":"65af5ebb-1d3d-4f2b-b996-0e827b071d88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/257 \\\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":"The endpoint returns a live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/257"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/257"}],"useCases":["Accessing pay-per-request APIs without traditional API key registration","Making micropayments for API calls using USDC on Base","Agent-driven API consumption with x402 payment headers"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.071Z"},"updatedAt":"2026-04-23T14:31:09.706Z"}}