{"id":"82b4307e-4479-4860-b88d-7c36c48b4b91","shortId":"4CpkTT","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/328` is labeled \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform lists endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All are priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind the `/api/v1/charges/328` \"Premium API Access\" endpoint is unclear and may be a generic or catch-all entry point. Callers should expect to experiment or contact the provider for details on what this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages show only 'Connect wallet'","The specific functionality of /api/v1/charges/328 ('Premium API Access') is undefined; it may be a generic or placeholder endpoint","No example requests or responses are documented anywhere","The platform lists many endpoint categories (AI, finance, data, etc.) but provides zero technical detail on any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/328","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/328","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 402 challenge with clear pricing. However, there is no OpenAPI spec, no documentation beyond a wallet-connect prompt, no request/response schemas, and no clarity on what 'Premium API Access' actually returns. This is effectively a stub 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'/api/v1/charges/328':56,207 '/docs':170 '/pricing':172 '/readme':174 '/request':13,28 '0.02':12,27,90,162 '000':80 '0x8335':68 '20':79 '2913':69 '402 payment API' '6':85 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,61,210 'across':122 'advertis':75 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,60,94,209 'attach':105 'avail':201 'base':9,24,50,71,81 'behind':205 'broader':118 'call':4,19 'caller':103,225 'catch':221 'catch-al':220 'categori':124 'challeng':74 'classif':139 'commit':100 'connect':180 'contact':231 'contract':67 'convers':156 'crypto-gated API' 'data':125,129 'decim':86 'detail':187,235 'document':165,196 'embed':140 'endpoint':41,54,121,211,240 'entri':223 'equal':89 'estim':150 'exampl':199 'exchang':145 'expect':227 'experi':229 'export':130 'extrem':167 'feed':144 'financ':141 'four':123 'function':204 'gas':149 'gate':42 'generat':157 'generic':218 'geocod':154 'header':110 'infrastructur':152 'insight':131 'json-response' 'key':95 'label':58 'learn':134 'limit':97 'list':120 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':133 'maxamountrequir':77 'may':215 'metric':127 'network':51 'no-api-key' 'no-rate-limit' 'offer':32 'openapi':191 'page':175 'particular':239 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':200 'payment':46,64,109,115 'per':3,18,38,91,163 'platform':119 'point':224 'premium':5,20,59,208 'price':143,160 'prompt':182 'proof':116 'protocol':47 'provid':233 'quot':148 'rate':96,146 'render':177 'report':128 'request':39,92,164 'request/response':194 'requir':102 'return':241 'schema':195 'sentiment':135 'simpli':104 'spars':168 'spec':192 'specif':53,203 'suit':34 'summar':138 'technic':186 'text':137 'token':147 'unclear':213 'unit':82 'upfront':99 'usdc':15,30,66,88 'usdc-base' 'util':153 'valid':113,155 'via':10,25 'wallet':181 'web3':142 'x':108 'x-payment':107 'x402':11,26,45,73,114 'x402 API' 'x402-payment'","prices":[{"id":"de6132ed-4397-477f-ae44-e5d167f8dc72","listingId":"82b4307e-4479-4860-b88d-7c36c48b4b91","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/328","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:12.698Z"}],"sources":[{"listingId":"82b4307e-4479-4860-b88d-7c36c48b4b91","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/328","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:12.698Z","lastSeenAt":"2026-04-24T00:31:57.320Z"}],"details":{"listingId":"82b4307e-4479-4860-b88d-7c36c48b4b91","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/328 \\\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":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/328"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use endpoints into autonomous agent workflows"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Prototyping and low-volume usage where subscriptions are overkill"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.219Z"},"updatedAt":"2026-04-24T00:31:57.320Z"}}