{"id":"d96e7a2e-fe49-46e9-bd13-53454eedebd1","shortId":"4CbrVQ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call 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 Base with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/59` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address. The response MIME type is application/json, and the endpoint accepts HTTP POST requests.\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, and no examples available. It is unclear what specific data or functionality the `/api/v1/charges/59` endpoint returns, as the site's landing page lists many different API categories but does not map charge IDs to specific services. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","http-post"],"categories":["api-gateway","pay-per-call"],"synonyms":["low payment fee API","x402 API","micropayment API","USDC pay-per-call","Base network API","crypto-paid API","402 payment API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content","No OpenAPI or schema provided; request body format and response structure are unknown","The specific functionality of /api/v1/charges/59 ('Premium API Access') is ambiguous — it is unclear which of the listed services it maps to","No examples or sample responses available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/59","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/charges/59","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schema, and no indication of what this specific charge ID actually returns. The docs pages are all empty wallet-connect 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'/api/v1/charges/59':111,220 '/docs':182 '/pricing':183 '/readme':186 '0.02':10,24,89,141 '000':128 '0x8335':133 '20':127 '2913':134 '402':248 '402 payment API' '6':137 'Base network API' 'USDC pay-per-call' 'accept':173 'access':6,20,36,116 'address':163 'advertis':123 'ai/ml':60 'analysi':63 'analyt':59 'api':5,19,35,56,99,115,232 'application/json':169 'attach':150 'avail':210 'base':8,22,43,96,129,136 'base-network' 'behind':37 'broad':49 'call':55 'caller':149 'captur':250 'catalog':50 'categori':233 'challeng':120,122,249 'charg':238 'classif':65 'commit':107 'confirm':246 'connect':192 'content':198 'convers':82 'crypto-paid API' 'data':58,216 'decim':138 'differ':231 'document':177 'embed':66 'endpoint':30,85,110,172,221,244 'equal':140 'estim':76 'exact':147 'exampl':209 'exchang':71 'extrem':179 'feed':70 'financ':67 'function':218 'gas':75 'gate':3,17 'generat':83 'geocod':80 'header':155 'host':47 'http':174 'http-post' 'id':239 'infer':61 'infrastructur':78 'json-response' 'key':100 'label':113 'land':227 'limit':103 'list':229 'live':247 'low payment fee API' 'lowpaymentfee.com':32 'mani':230 'map':237 'maxamountrequir':125 'micropayment API' 'mime':166 'minimum':106 'network':44 'no-api-key' 'openapi':202 'page':187,228 'pay':9,23,53 'pay-per-cal':52 'pay-per-request' 'payment':142,154,159 'payto':162 'paywal':40 'per':11,25,54,90 'post':175 'premium':4,18,34,114 'price':69,87 'prompt':194 'provid':33 'quot':74 'rate':72,102 'render':189 'request':12,26,91,176 'request/response':205 'respons':165 'return':222 'schema':206 'scheme':148 'sentiment':62 'servic':242 'settl':92 'sign':158 'site':46,225 'span':57 'spars':180 'spec':203 'specif':109,215,241 'success':251 'summar':64 'token':73 'type':167 'unclear':213 'unit':130 'usdc':14,28,94,132 'usdc-settlement' 'util':79 'valid':81 'via':144 'wallet':193 'web3':68 'x':153 'x-payment':152 'x402':2,16,39,119,146 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1388dad7-d24c-4ab7-a23d-b28b14001a17","listingId":"d96e7a2e-fe49-46e9-bd13-53454eedebd1","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/charges/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:36.829Z"}],"sources":[{"listingId":"d96e7a2e-fe49-46e9-bd13-53454eedebd1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:36.829Z","lastSeenAt":"2026-04-23T21:32:04.333Z"}],"details":{"listingId":"d96e7a2e-fe49-46e9-bd13-53454eedebd1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/59"},{"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 & Machine Learning, 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/charges/59"}],"useCases":["Programmatic access to paid API services without traditional API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Accessing data, AI, finance, or utility endpoints with per-request micropayments"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","Crypto-native applications that can sign USDC payments on Base","Low-volume or bursty workloads where per-request pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume use cases where per-request pricing at $0.02 may be expensive compared to bulk plans","Users without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.994Z"},"updatedAt":"2026-04-23T21:32:04.333Z"}}