{"id":"c03cb69e-867d-46a8-8cfd-60a2ea6b2933","shortId":"M8fGdn","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 specific resource path is `/api/v1/charges/292`, which is one of many endpoints offered by the provider. The site advertises 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\nThe endpoint accepts HTTP POST requests and returns `application/json`. Payment is settled on-chain via USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a `maxAmountRequired` of 20,000 base units; since USDC uses 6 decimals, this equals $0.02 per request — consistent with the site's advertised flat pricing of $0.02/request across all endpoints. No API keys are required; access is granted purely through the x402 payment header. The provider claims no rate limits and instant access.\n\nHowever, the specific functionality behind `/api/v1/charges/292` is not documented beyond the generic label \"Premium API Access.\" The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, request/response schemas, or usage examples. Without knowing what this particular charge endpoint does — or what request body it expects — callers will need to experiment or contact the provider. The lack of OpenAPI specs, detailed docs, or example payloads significantly limits discoverability.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","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":["The specific functionality of /api/v1/charges/292 is undocumented — 'Premium API Access' is a generic label with no details on what data or service is returned.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no usable content.","The provider lists many endpoint categories (AI, finance, data, utilities) but it is unclear which, if any, are fully implemented behind this charge path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/292","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/292","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/charges/292 is unknown beyond the generic label 'Premium API Access'. Docs pages returned only wallet-connect 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'/request':153 '0.02':10,24,140,152 '000':130 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':121 '20':129 '6':136 'Base network API' 'USDC micropayment API' 'accept':103 'access':6,20,36,162,179,195 'across':154 'addit':212 'advertis':63,148 'ai':76 'analysi':80 'analyt':75 'api':5,19,35,72,158,194 'application/json':109 'base':8,22,43,119,131 'behind':37,184 'beyond':189 'bodi':231 'broad':65 'call':71 'caller':234 'catalog':66 'chain':115 'challeng':124 'charg':225 'claim':173 'classif':82 'connect':207 'consist':143 'contact':240 'contract':120 'convers':99 'crawl':197 'crypto-paid API' 'data':74 'decim':137 'detail':248 'discover':255 'doc':198,249 'document':188,214 'embed':83 'endpoint':30,56,102,156,226 'equal':139 'estim':93 'exampl':219,251 'exchang':88 'expect':233 'experi':238 'feed':87 'financ':84 'flat':149 'function':183 'gas':92 'gate':3,17 'generat':100 'generic':191 'geocod':97 'grant':164 'header':170 'howev':180 'http':104 'http-post' 'infrastructur':95 'instant':178 'json-response' 'key':159 'know':221 'label':192 'lack':244 'learn':78 'limit':176,254 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':77 'mani':55 'maxamountrequir':127 'need':236 'network':44 'no-api-key' 'offer':57 'on-chain':113 'one':53 'openapi':246 'page':202 'particular':224 'path':48 'pay':9,23,69 'pay-per-cal':68 'pay-per-call API' 'pay-per-request' 'payload':252 'payment':110,169 'paywal':40 'per':11,25,70,141 'post':105 'premium':4,18,34,193 'premium API access' 'price':86,150,199 'prompt':209 'provid':33,60,172,242 'pure':165 'quot':91 'rate':89,175 'readm':201 'request':12,26,106,142,230 'request/response':215 'requir':161 'resourc':47 'return':108,204 'schema':216 'sentiment':79 'settl':112 'signific':253 'sinc':133 'site':62,146 'span':73 'spec':247 'specif':46,182 'specifi':125 'summar':81 'technic':213 'token':90 'unit':132 'usag':218 'usdc':14,28,117,134 'usdc-base' 'use':135 'util':96 'valid':98 'via':116 'wallet':208 'web3':85 'without':220 'x402':2,16,39,123,168 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"bf40cf22-8657-4d32-94cd-ce4f25140c25","listingId":"c03cb69e-867d-46a8-8cfd-60a2ea6b2933","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/292","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:58.087Z"}],"sources":[{"listingId":"c03cb69e-867d-46a8-8cfd-60a2ea6b2933","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/292","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:58.087Z","lastSeenAt":"2026-04-24T01:32:05.817Z"}],"details":{"listingId":"c03cb69e-867d-46a8-8cfd-60a2ea6b2933","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/292 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/292"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/292"},{"claim":"Provider advertises categories: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without needing API keys or subscriptions","Integrating on-chain USDC micropayments into automated agent workflows","Accessing a variety of data, AI, finance, and utility endpoints at low cost"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.919Z"},"updatedAt":"2026-04-24T01:32:05.817Z"}}