{"id":"eb00310e-2d9a-425f-8237-0307410c04c4","shortId":"u9R9Gg","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/claims/31` is one of many offered by the provider, which hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nPricing is uniform across all endpoints at $0.02 per request, settled in USDC (USD Coin) on Base. The x402 challenge confirms a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The provider advertises no rate limits and instant access.\n\nThe specific functionality behind `/api/v1/claims/31` is not documented beyond the label \"Premium API Access.\" The provider's docs, pricing, and API pages all render only a wallet-connect prompt with no additional technical documentation, OpenAPI schemas, or example request/response payloads. Without further documentation it is unclear what input this particular endpoint expects or what data it returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge) and accepts POST requests.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API","402 payment required API"],"warnings":["No documentation available — docs, pricing, API, and README pages all render only a wallet-connect prompt with no content.","The specific functionality of /api/v1/claims/31 is undocumented; 'Premium API Access' is the only description.","No OpenAPI or output schema provided beyond the basic HTTP POST input declaration.","No example request or response payloads available to verify what this endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/claims/31","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/31","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 with clear pricing, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/claims/31 is entirely opaque beyond the generic label 'Premium API 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'0.02':10,29,114,141 '000':132 '20':131 '402':234 '402 payment required API' '6':137 'Base network API' 'USDC pay-per-call' 'accept':241 'access':6,25,46,169,183 'across':110 'addit':202 'advertis':163 'ai':82 'analysi':86 'analyt':81 'api':5,24,45,78,143,182,190 'attach':149 'base':8,27,54,123,133 'base-network' 'behind':173 'beyond':178 'broad':71 'call':77 'caller':147 'catalog':72 'challeng':126,239 'classif':88 'coin':121 'confirm':127,231 'connect':198 'convers':105 'data':80,225 'decim':138 'doc':187 'document':177,204,213 'embed':89 'endpoint':40,58,112,221,229 'equal':140 'estim':99 'exampl':208 'exchang':94 'expect':222 'feed':93 'financ':90 'function':172 'gas':98 'gate':3,22 'generat':106 'geocod':103 'header':154 'host':69 'infrastructur':101 'input':218 'instant':168 'key':16,35,144 'label':180 'learn':84 'limit':19,38,166 'live':232 'low payment fee API' 'lowpaymentfee.com':42 'machin':83 'mani':63 'maxamountrequir':129 'micropayment API' 'network':55 'no-api-key' 'offer':64 'one':61 'openapi':205 'page':191 'particular':220 'pay':9,28,75 'pay-per-cal':74 'pay-per-request' 'payload':210 'payment':50,153,159 'per':11,30,76,115 'post':242 'post-method' 'premium':4,23,44,181 'price':92,107,188 'prompt':199 'proof':160 'protocol':51 'provid':43,67,162,185 'quot':97 'rate':18,37,95,165 'render':193 'request':12,31,116,243 'request/response':209 'requir':146 'return':227,233 'schema':206 'sentiment':85 'settl':117 'simpli':148 'span':79 'specif':57,171 'summar':87 'technic':203 'token':96 'unclear':216 'uniform':109 'unit':134 'usd':120 'usdc':14,33,119,136 'usdc-settlement' 'util':102 'valid':104,157,237 'via':47 'wallet':197 'wallet-connect':196 'web3':91 'without':211 'x':152 'x-payment':151 'x402':2,21,49,125,158,238 'x402 premium API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"9b7db592-be9e-4863-9ae1-ad3b3028547e","listingId":"eb00310e-2d9a-425f-8237-0307410c04c4","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:47.691Z"}],"sources":[{"listingId":"eb00310e-2d9a-425f-8237-0307410c04c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/claims/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:47.691Z","lastSeenAt":"2026-04-23T20:32:29.577Z"}],"details":{"listingId":"eb00310e-2d9a-425f-8237-0307410c04c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/claims/31 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/claims/31"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/claims/31"},{"claim":"Provider offers APIs in categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Integrating x402 payment flows into agent-based workflows on Base","Accessing a catalog of data, AI, finance, and utility endpoints with uniform micropayment pricing"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible agents that can settle USDC on Base","Prototyping workflows that need cheap, keyless API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.519Z"},"updatedAt":"2026-04-23T20:32:29.577Z"}}