{"id":"d6d1b364-fcc7-450d-ba82-bb8ded81bb35","shortId":"VpaKmZ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access 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 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 resource `/api/v1/payments/198` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the docs, API, pricing, 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 usage examples available from the crawled material. The actual functionality behind this particular endpoint path (`/payments/198`) is unclear — it may be a generic premium access gate or a specific resource. Prospective users should test with a small payment to discover the response format.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"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, API, and README pages all render only 'Connect wallet'","No OpenAPI or schema specification found","The actual functionality and response format of /api/v1/payments/198 is unknown","No request body schema or example responses are documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/198","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc/pricing/README pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind /api/v1/payments/198 is not described beyond the generic label 'Premium API 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'/payments/198':209 '0.02':12,28,90,134 '000':121 '0x8335':126 '20':120 '2913':127 '6':130 'Base network API' 'USDC micropayment API' 'accept':155 'access':7,23,40,109,218 'actual':202 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,108,144,167 'application/json':160 'avail':196 'base':9,25,98,122,129 'base-network' 'behind':204 'broad':50 'call':4,20 'catalog':51 'challeng':115 'classif':66 'connect':176 'content':182 'convers':83 'crawl':199 'crypto-paid API' 'data':59 'decim':131 'discov':233 'doc':166 'document':161,191 'embed':67 'endpoint':34,86,154,207 'equal':133 'estim':77 'exact':141 'exampl':195 'exchang':72 'extrem':163 'feed':71 'financ':68 'format':236 'function':203 'gas':76 'gate':219 'generat':84 'generic':216 'geocod':81 'host':48 'infer':62 'infrastructur':79 'json-response' 'key':145 'limit':148 'list':105 'lowpaymentfee' 'lowpaymentfee.com':36 'made':137 'materi':200 'maxamountrequir':118 'may':213 'network':99 'no-api-key' 'openapi':186 'page':171 'particular':206 'path':208 'pay':2,18,54 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':53 'payment':44,135,231 'per':3,13,19,29,55,91 'post':156 'post-method' 'premium':5,21,38,107,217 'premium API access' 'price':70,88,168 'prompt':178 'prospect':224 'protocol':45 'provid':37 'quot':75 'rate':73,147 'readm':170 'render':173 'request':14,30,56,92,157 'request/response':189 'requir':152 'resourc':102,223 'respons':235 'return':111,159 'schema':190 'scheme':142 'sentiment':63 'settl':93 'site':47 'small':230 'span':58 'spars':164 'spec':187 'specif':101,222 'subscript':151 'summar':65 'test':227 'token':74 'unclear':211 'unit':123 'usag':194 'usdc':16,32,95,125 'usdc-settlement' 'user':225 'util':80 'valid':82,113 'via':10,26,41,138 'wallet':177 'web3':69 'x402':11,27,43,114,140 'x402 API' 'x402-payment'","prices":[{"id":"4aeec351-8d71-4db2-8d40-f6bccee5600f","listingId":"d6d1b364-fcc7-450d-ba82-bb8ded81bb35","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:47.936Z"}],"sources":[{"listingId":"d6d1b364-fcc7-450d-ba82-bb8ded81bb35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:47.936Z","lastSeenAt":"2026-04-23T16:07:16.342Z"}],"details":{"listingId":"d6d1b364-fcc7-450d-ba82-bb8ded81bb35","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/198 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/198"},{"claim":"All endpoints 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 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/payments/198"}],"useCases":["Accessing premium API resources without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints via x402 protocol"],"bestFor":["Developers who want instant API access without signup or subscriptions","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying per-request in USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.939Z"},"updatedAt":"2026-04-23T16:07:16.342Z"}}