{"id":"3b63ebba-a0e0-45b0-b919-71f7e9529ae9","shortId":"C2PseH","kind":"x402","title":"Pay-per-request premium API access on Base via x402 at $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 at $0.02/call 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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/311` is labeled \"Premium API Access\" in the x402 challenge. The platform advertises no API keys, no rate limits, and instant access. Payment is made per-call using the x402 protocol: callers attach an X-PAYMENT header with a signed USDC payment of up to 20,000 base units (i.e., $0.02 given USDC's 6 decimals) on Base. The asset contract is the canonical Base USDC (0x8335…2913).\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 schema, no request/response examples, and no description of what \"Premium API Access\" actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality this specific charge endpoint provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","pay-per-use"],"categories":["api-gateway","payments"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs/pricing/README pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/311 ('Premium API Access') is undefined in available materials","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/311","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/311","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is zero documentation on what it actually does or returns. No OpenAPI schema, no examples, no request/response format. The listing is effectively a stub with only pricing and protocol details 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'/call':14,30 '0.02':13,29,72,137 '000':133 '0x8335':153 '20':132 '2913':154 '402':204 '402 payment api' '6':141 'access':7,23,40,90,106,193 'actual':194 'advertis':97 'ai':60 'analyt':59 'api':6,22,39,89,99,161,192 'asset':146 'attach':118 'base':9,25,80,134,144,151 'base network api' 'base-network' 'call':112 'caller':117 'canon':150 'categori':68 'challeng':94,205 'charg':218 'confirm':199 'connect':170 'contract':147 'data':58,213 'decim':142 'descript':188 'detail':177 'doc':160 'document':155,208 'endpoint':34,51,84,197,219 'exampl':185 'extrem':157 'financ':63 'function':215 'given':138 'header':123 'i.e':136 'infrastructur':66 'instant':105 'key':100 'label':87 'learn':62 'limit':103 'live':200 'low payment fee' 'lowpaymentfee.com':36 'machin':61 'made':109 'mani':50 'micropayment api' 'network':81 'no-api-key' 'offer':52 'one':48 'openapi':181 'page':165 'pay':2,18 'pay per request api' 'pay-per-request':1,17 'pay-per-use' 'payment':44,107,122,128 'per':3,19,73,111 'per-cal':110 'per-request-billing' 'platform':55,96 'premium':5,21,38,88,191 'price':70,162 'prompt':172 'protocol':45,116 'provid':37,220 'rate':102 'readm':164 'render':167 'request':4,20,74 'request/response':184 'return':195,201 'schema':182 'settl':75 'sign':126 'span':57 'spars':158 'specif':83,217 'technic':176 'unclear':211 'unit':135 'usdc':16,32,77,127,139,152 'usdc api access' 'usdc-settlement' 'use':113 'util':67 'valid':203 'via':10,26,41 'wallet':171 'web3':64 'without':207 'x':121 'x-payment':120 'x402':11,27,43,93,115 'x402 api' 'x402-payment'","prices":[{"id":"5a58f7f3-cd07-42e7-bf46-8699c09f17c4","listingId":"3b63ebba-a0e0-45b0-b919-71f7e9529ae9","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/311","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:01.079Z"}],"sources":[{"listingId":"3b63ebba-a0e0-45b0-b919-71f7e9529ae9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/311","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:01.079Z","lastSeenAt":"2026-04-24T01:32:05.966Z"}],"details":{"listingId":"3b63ebba-a0e0-45b0-b919-71f7e9529ae9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/311 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/311"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/311"}],"useCases":["Accessing premium API functionality without subscription or API key management","Making one-off paid API calls settled instantly in USDC on Base","Agent-driven programmatic access to paid endpoints without account setup"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","Anyone without USDC on the Base network","Use cases requiring high-volume discounted pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.737Z"},"updatedAt":"2026-04-24T01:32:05.966Z"}}