{"id":"1942da36-a6e8-4cee-a94b-4f51e83e2c9e","shortId":"n3euL2","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/inbox/59` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) per call. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request. The payment timeout is 300 seconds.\n\nHowever, the specific functionality behind `/api/v1/inbox/59` is not documented on the provider's landing page, which only lists other named endpoints (metrics, reports, sentiment analysis, etc.). The description field in the x402 challenge is the generic \"Premium API Access\" with no further detail, and no OpenAPI schema or response examples are available. Callers should treat this as an opaque premium endpoint whose exact behavior is unknown without further experimentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","base network api","premium api access"],"warnings":["The exact functionality of /api/v1/inbox/59 is not documented anywhere in the crawled material — the description 'Premium API Access' is generic.","No OpenAPI spec, response schema, or example responses are available.","The provider's /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","Other endpoints on the same domain (analytics, AI, finance, utils) are listed but this specific inbox path is not among them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/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/inbox/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 (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/inbox/59 is entirely undocumented. No OpenAPI schema, no response examples, and the landing page does not list this particular path. This is effectively a stub 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'/request':13,28 '0.02':12,27,76,115 '000':104 '0x8335':109 '20':103 '2913':110 '300':144 '6':113 'USDC micropayment api' 'accept':94 'access':7,22,38,184 'ai':65 'analysi':170 'analyt':64 'api':6,21,37,121,183 'attach':132 'avail':197 'base':9,24,84,105,112 'base network api' 'behavior':209 'behind':150 'broad':60 'call':4,19,117 'caller':130,198 'catalog':61 'challeng':88,178 'commit':129 'confirm':89 'data':63 'decim':114 'descript':173 'detail':188 'document':154 'endpoint':32,52,91,166,206 'etc':171 'exact':100,208 'exampl':195 'experiment':214 'field':174 'financ':68 'function':149 'generic':181 'header':136 'host':58 'howev':146 'infrastructur':71 'key':122 'land':159 'learn':67 'limit':125 'list':163 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'metric':167 'minimum':128 'name':165 'network':85 'no-api-key' 'no-rate-limit' 'offer':53 'one':49 'opaqu':204 'openapi':191 'page':160 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request' 'payment':42,101,135,141 'per':3,18,77,116 'post':95 'post-endpoint' 'premium':5,20,36,182,205 'premium api access' 'price':74 'protocol':43 'provid':35,56,157 'rate':124 'report':168 'request':78,96,139 'requir':98 'respons':194 'schema':192 'second':145 'sentiment':169 'settl':79 'simpli':131 'span':62 'specif':45,148 'timeout':142 'treat':200 'unit':106 'unknown':211 'usdc':15,30,81,108 'usdc-base' 'util':72 'via':10,25,39 'web3':69 'whose':207 'without':212 'x402':11,26,41,87,134,177 'x402 api' 'x402-payment'","prices":[{"id":"3a1f01a9-fd61-44eb-8c10-3498d0ae7d0e","listingId":"1942da36-a6e8-4cee-a94b-4f51e83e2c9e","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/inbox/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":"2026-04-21T18:32:31.769Z"}],"sources":[{"listingId":"1942da36-a6e8-4cee-a94b-4f51e83e2c9e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.769Z","lastSeenAt":"2026-04-22T04:02:46.194Z"}],"details":{"listingId":"1942da36-a6e8-4cee-a94b-4f51e83e2c9e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/59","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"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/inbox/59"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/59"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments","Accessing premium data or services without API key registration","Programmatic pay-as-you-go endpoint usage on Base L2"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.887Z"},"updatedAt":"2026-04-22T04:02:46.194Z"}}