{"id":"39a15f03-a65b-45a6-a369-dd268775e598","shortId":"vBjZG8","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 accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/accounts/11` is labeled \"Premium API Access\" and accepts POST requests, settling payments 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.\n\nThe broader platform advertises four categories of APIs: 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific `/api/v1/accounts/11` endpoint's purpose is unclear — it does not appear in the site's listed API catalog, and no documentation, request/response schemas, or examples are available. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this particular endpoint returns, consumers should treat it as an opaque premium-access call until further documentation is published.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The /api/v1/accounts/11 endpoint does not appear in the provider's own listed API catalog — its function is undocumented.","All documentation pages (/docs, /pricing, /README, /api) returned only 'Connect wallet' with no substantive content.","No request body schema or response schema is available; consumers cannot know what to send or what to expect back.","The broader platform lists many endpoint categories but none of them have been verified as functional beyond this single probe."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/11","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/accounts/11","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, confirming it accepts USDC on Base at $0.02/request. However, the specific /accounts/11 endpoint is not documented anywhere on the site, no request/response schemas are available, and all documentation pages returned only a wallet-connect prompt with no content. The purpose of this particular endpoint is 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'/request':13,28 '0.02':12,27,93,142 '000':83 '0x8335':71 '20':82 '2913':72 '6':88 'Base network API' 'USDC micropayment API' 'accept':63 'access':7,22,42,61,219 'advertis':78,99 'ai':111 'analysi':115 'analyt':105 'api':6,21,40,60,103,147,175 'appear':169 'avail':185 'base':9,24,50,74,84 'base-network' 'broader':97 'call':4,19,220 'catalog':176 'categori':101 'challeng':77 'classif':118 'commit':155 'connect':196 'consum':210 'content':202 'contract':70 'convers':135 'crypto-paid API' 'data':104,108 'decim':89 'doc':187 'document':179,223 'embed':119 'endpoint':41,54,138,161,208 'equal':92 'estim':129 'exampl':183 'exchang':124 'export':109 'feed':123 'financ':120 'four':100 'gas':128 'generat':136 'geocod':133 'howev':157 'infrastructur':131 'insight':110 'key':148 'know':204 'label':58 'learn':113 'limit':151 'list':140,174 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'maxamountrequir':80 'metric':106 'minimum':154 'network':51 'no-api-key' 'offer':32 'opaqu':216 'page':191 'particular':207 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,67 'per':3,18,38,94,143 'platform':98 'post':64 'post-endpoint' 'premium':5,20,59,218 'premium API access' 'premium-access':217 'price':122,188 'prompt':198 'protocol':47 'publish':225 'purpos':163 'quot':127 'rate':125,150 'readm':190 'report':107 'request':39,65,95,144 'request/response':180 'requir':156 'return':193,209 'schema':181 'sentiment':114 'settl':66 'site':172 'specif':53,159 'substant':201 'suit':34 'summar':117 'text':116 'token':126 'treat':212 'unclear':165 'unit':85 'usdc':15,30,69,91 'usdc-settlement' 'util':132 'valid':134 'via':10,25,43 'wallet':197 'web3':121 'without':203 'x402':11,26,45,76 'x402 API' 'x402-payment'","prices":[{"id":"e4ef391f-d01c-4d8e-9cc3-ed90f7041496","listingId":"39a15f03-a65b-45a6-a369-dd268775e598","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/accounts/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:13.566Z"}],"sources":[{"listingId":"39a15f03-a65b-45a6-a369-dd268775e598","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:13.566Z","lastSeenAt":"2026-04-24T10:32:17.239Z"}],"details":{"listingId":"39a15f03-a65b-45a6-a369-dd268775e598","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/11 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/11"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/11"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium data or services without traditional API key management","Agent-driven workflows that need instant, keyless API access settled in USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers or agents wanting frictionless pay-per-call API access on Base","x402 protocol experimentation with low per-request cost","Scenarios where no signup or API key provisioning is desired"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring known, well-documented response schemas for the /accounts/11 endpoint","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.47Z"},"updatedAt":"2026-04-24T10:32:17.239Z"}}