{"id":"4acf6d86-811b-40f0-a481-bf2ec7cac8fb","shortId":"QdHmXm","kind":"x402","title":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/claims/22` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific functionality behind `/api/v1/claims/22` is labeled \"Premium API Access\" but its exact purpose is not documented beyond that generic title — it is not listed among the named endpoints on the site's landing page, so it may be a catch-all or test route.\n\nAll endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network via the x402 exact-payment scheme. The probe confirms the endpoint is live, returning a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913, 6 decimals = $0.02). No API keys or rate limits are advertised; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The POST method is required.\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, and no usage examples. Without knowing what this specific endpoint returns, agents should treat it as an opaque JSON endpoint and experiment cautiously.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method"],"categories":["api","misc"],"synonyms":["premium api","lowpaymentfee","x402 api","micropayment api","base usdc api","pay-per-call api","claims endpoint"],"warnings":["The exact functionality of /api/v1/claims/22 is unknown — it is not listed among the named endpoints on the landing page.","No documentation, OpenAPI spec, or request/response schema is available.","All doc/pricing/README pages render only 'Connect wallet' with no content.","No examples of expected input or output exist in any crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/22","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/claims/22","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 the specific functionality of /api/v1/claims/22 is undocumented. There is no OpenAPI spec, no request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The listing is effectively a 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'/api/v1/claims/22':32,67 '/docs':191 '/pricing':192 '/readme':195 '0.02':10,24,117,158 '000':149 '0x8335':154 '20':148 '2913':155 '402':143 '6':156 'access':72 'addit':206 'advertis':166 'agent':227 'ai':55 'among':88 'analyt':54 'api':5,19,51,71,160 'attach':169 'base':8,22,125,150 'base usdc api' 'behind':66 'beyond':80 'caller':167 'catch':104 'catch-al':103 'cautious':238 'challeng':144 'claims endpoint' 'collect':42 'confirm':136 'connect':201 'content':207 'data':53 'decim':157 'document':79,186 'endpoint':6,20,30,91,110,138,225,235 'exact':75,131 'exact-pay':130 'exampl':219 'experi':237 'extrem':188 'financ':58 'function':65 'gate':3,17 'generic':82 'header':174 'infrastructur':61 'json':234 'json-api' 'key':161 'know':221 'label':69 'land':96 'learn':57 'limit':164 'list':87 'live':140 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'may':100 'method':183 'micropayment api' 'name':90 'network':126 'offer':40 'opaqu':233 'openapi':211 'page':97,196 'part':34 'pay':9,23,48 'pay-per-call api' 'pay-per-request':47 'payment':132,173,179 'per':11,25,49,118 'platform':38,113 'post':182 'post-method' 'premium':4,18,70 'premium api' 'price':115 'probe':135 'prompt':203 'proof':180 'protocol':46 'purpos':76 'rate':163 'render':198 'request':12,26,50,119,145 'request/response':214 'requir':185 'return':141,226 'rout':108 'schema':215 'scheme':133 'settl':120 'simpli':168 'site':94 'span':52 'spars':189 'spec':212 'specif':64,224 'test':107 'titl':83 'treat':229 'unit':151 'usag':218 'usdc':14,28,122,153 'usdc-base' 'util':62 'valid':177 'via':127 'wallet':202 'web3':59 'without':220 'x':172 'x-payment':171 'x402':2,16,45,129,178 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"e27d9098-513f-4b81-96bf-8312b900bc0b","listingId":"4acf6d86-811b-40f0-a481-bf2ec7cac8fb","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/claims/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:41.660Z"}],"sources":[{"listingId":"4acf6d86-811b-40f0-a481-bf2ec7cac8fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:41.660Z","lastSeenAt":"2026-04-22T07:00:55.781Z"}],"details":{"listingId":"4acf6d86-811b-40f0-a481-bf2ec7cac8fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/22 \\\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 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/22"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/22"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request JSON API without needing API keys or subscriptions","Testing x402 payment flows on the Base network at low cost","Programmatic access to an unnamed premium data or utility service"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-as-you-go API access on Base","Low-cost per-request API consumption without rate limits"],"notFor":["Users who need well-documented, schema-defined endpoints","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.764Z"},"updatedAt":"2026-04-22T07:00:55.781Z"}}