{"id":"063f1a4e-0a90-4ca5-8da4-ce2f31de2d04","shortId":"JFTxu9","kind":"x402","title":"x402-gated token data endpoint for API3 on Base, pay $0.02 per request in USDC.","tagline":"x402-gated token data endpoint for API3 on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides premium API access to API3 token data via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and infrastructure utilities — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/tokens/API3` appears to serve token-level information for the API3 project. Payment is settled in USDC (contract 0x8335…2913 on Base) at a cost of $0.02 per request (20,000 base units with 6 decimals). The x402 challenge confirms the endpoint is live, accepts POST requests, and uses the \"exact\" payment scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The endpoint's actual response format and the specific fields returned for the API3 token are unknown. The platform lists a uniform $0.02 price across all endpoints and advertises no minimums, no commitments, and instant access.","tags":[],"capabilities":["x402-payment","usdc-base","token-data","pay-per-request","no-api-key","crypto-market-data"],"categories":["finance","crypto"],"synonyms":["API3 token info","token price lookup","crypto token data","x402 API","micropayment API","Base USDC API","pay-per-call token endpoint"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No request or response schema provided; actual output format is unknown","No OpenAPI or ai-plugin manifest detected","The specific data returned for /api/v1/tokens/API3 is not documented anywhere in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/API3","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/tokens/API3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge with clear pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual data returned is entirely unknown, making this effectively a stub 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'0.02':12,28,114,225 '000':118 '0x8335':106 '20':117 '2913':107 '300':143 '6':122 'API3 token info' 'Base USDC API' 'accept':132 'access':40,154,238 'across':227 'actual':206 'advertis':153,231 'ai/ml':68 'analyt':67 'api':39,147,170 'api3':8,24,42,98,216 'appear':89 'avail':198 'base':10,26,83,109,119 'behind':78 'broader':55 'call':63 'challeng':126 'commit':235 'confirm':127 'connect':178 'contract':105 'cost':112 'crawl':201 'crypto token data' 'crypto-market-data' 'data':5,21,44,66,72 'decim':123 'detail':185 'doc':168 'document':163 'dozen':58 'endpoint':6,22,34,64,87,129,204,229 'exact':138 'exampl':197 'extrem':165 'field':212 'finance/web3':70 'format':208 'gate':3,19,77 'grant':156 'header':162 'infer':69 'inform':95 'infrastructur':74 'instant':237 'key':148 'level':94 'limit':151 'list':222 'live':131 'lowpaymentfee.com':36 'market':71 'materi':202 'micropay':80 'micropayment API' 'minimum':233 'network':84 'no-api-key' 'offer':57 'openapi':189 'page':173 'part':52 'pay':11,27,61 'pay-per-cal':60 'pay-per-call token endpoint' 'pay-per-request' 'payment':48,100,139,161 'per':13,29,62,115 'platform':56,221 'post':133 'premium':38 'price':169,226 'project':99 'prompt':180 'protocol':49 'provid':37 'pure':157 'rate':150 'readm':172 'render':175 'request':14,30,116,134 'request/response':192 'respons':207 'return':213 'schema':193 'scheme':140 'second':144 'serv':91 'settl':102 'span':65 'spec':190 'specif':86,211 'technic':184 'thin':166 'timeout':145 'token':4,20,43,93,217 'token price lookup' 'token-data' 'token-level':92 'uniform':224 'unit':120 'unknown':219 'usag':196 'usdc':16,32,104 'usdc-base' 'use':136 'util':75 'via':45 'wallet':179 'x402':2,18,47,79,125,160 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"e7bcac68-7b76-4f08-aa26-1578e923fbb7","listingId":"063f1a4e-0a90-4ca5-8da4-ce2f31de2d04","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/tokens/API3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:53.824Z"}],"sources":[{"listingId":"063f1a4e-0a90-4ca5-8da4-ce2f31de2d04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/API3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:53.824Z","lastSeenAt":"2026-04-23T20:01:28.681Z"}],"details":{"listingId":"063f1a4e-0a90-4ca5-8da4-ce2f31de2d04","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/API3 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\"","exampleRequest":null,"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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/API3"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/API3"}],"useCases":["Fetching API3 token metadata or pricing data on demand","Agent-driven crypto portfolio lookups without API key management","Integrating low-cost token data calls into automated trading or analytics pipelines"],"bestFor":["Agents needing keyless, pay-per-call access to token data","Developers prototyping crypto data integrations without subscription commitments","x402-native workflows on the Base network"],"notFor":["High-volume bulk token data retrieval (no documented batch support)","Users who need detailed API documentation or guaranteed SLAs","Non-crypto use cases unrelated to token data"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:15:54.046Z"},"updatedAt":"2026-04-23T20:01:28.681Z"}}