{"id":"eb5edc8e-cde6-43a1-874f-f914323012e3","shortId":"tBhPvX","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. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/128` returned a live 402 challenge confirming x402 version 1 support. The challenge specifies payment to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base, with a maxAmountRequired of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. 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 description of what this particular endpoint actually returns. The provider's landing page lists sibling endpoints across analytics, AI, finance, and utility categories, but the specific functionality behind `/api/v1/payments/128` is not documented. Prospective callers should be aware that without schema documentation, the request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"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":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for this endpoint","The specific functionality of /api/v1/payments/128 is undocumented and unclear — it does not appear in the provider's listed API catalog","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/128","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/payments/128","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 documentation of what the endpoint actually does, no request/response schema, no OpenAPI spec, and all doc pages render only 'Connect wallet'. The specific purpose of /api/v1/payments/128 is entirely 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'/request':13,28 '0.02':12,27,73,130 '000':126 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':114 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':118 '1':106 '20':125 '300':143 '402':101 '6':134 'Base network API' 'USDC micropayment API' 'accept':148 'access':7,22,38 'across':200 'actual':190 'address':113 'ai':60,202 'analyt':59,201 'api':6,21,37,85,159 'awar':220 'base':9,24,81,120,127 'behind':211 'bodi':227 'call':4,19 'caller':217 'categori':56,206 'challeng':102,109 'commit':92 'confirm':103 'connect':167 'content':173 'contract':117 'crypto-paid API' 'data':58 'decim':135 'descript':184 'doc':157 'document':152,215,224 'endpoint':32,49,69,96,147,189,199 'exact':140 'extrem':154 'financ':63,203 'format':228 'function':210 'given':131 'http':149 'http-post' 'i.e':129 'includ':57 'infrastructur':66 'key':86 'land':195 'learn':62 'limit':89 'list':197 'live':100 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'maxamountrequir':123 'network':82 'no-api-key' 'offer':50 'one':46 'openapi':177 'page':162,196 'particular':188 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,111,137 'per':3,18,74 'post':150 'premium':5,20,36 'premium API access' 'price':71,158 'prompt':169 'prospect':216 'protocol':43 'provid':35,53,193 'rate':88 'readm':161 'render':164 'request':75,151,226 'request/response':180 'requir':93 'respons':230 'return':98,191 'schema':181,223 'scheme':138 'second':144 'sibl':198 'span':55 'spars':155 'spec':178 'specif':95,209 'specifi':110 'structur':231 'support':107 'timeout':145 'unit':128 'unknown':233 'usdc':15,30,78,116,132 'usdc-base' 'use':115 'util':67,205 'version':105 'via':10,25,39 'wallet':168 'web3':64 'without':222 'x402':11,26,41,104 'x402 API' 'x402-payment'","prices":[{"id":"890f2c06-04b9-4428-9ae5-d0ccfadf5b64","listingId":"eb5edc8e-cde6-43a1-874f-f914323012e3","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/payments/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:30.503Z"}],"sources":[{"listingId":"eb5edc8e-cde6-43a1-874f-f914323012e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/128","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:30.503Z","lastSeenAt":"2026-04-23T17:31:47.523Z"}],"details":{"listingId":"eb5edc8e-cde6-43a1-874f-f914323012e3","quickStartSnippet":"# 1. POST to the endpoint — you'll get a 402 with payment challenge\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/128\n\n# 2. Pay the USDC challenge on Base, then resend with X-PAYMENT header\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/128 \\\n  -H \"X-PAYMENT: <signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a live 402 challenge with x402 version 1, maxAmountRequired 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/128"},{"claim":"All listed endpoints 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":"Provider offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/128"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to undocumented premium services"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base in USDC","Users who prefer crypto micropayments over subscription billing"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring free or fiat-only payment methods","High-volume callers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.663Z"},"updatedAt":"2026-04-23T17:31:47.523Z"}}