{"id":"036aab65-6b93-490c-a07a-8d08f111a309","shortId":"8HcZ9W","kind":"x402","title":"Check Filecoin (FIL) wallet balances via a pay-per-call x402 endpoint on Base.","tagline":"Check Filecoin (FIL) wallet balances via a pay-per-call x402 endpoint on Base.","description":"This endpoint at lowpaymentfee.com returns Filecoin (FIL) wallet balance data, accessed via the x402 payment protocol. Each call costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The caller simply includes an X-PAYMENT header with a valid x402 payment proof and receives a JSON response.\n\nThe endpoint is part of a broader suite of APIs offered by lowpaymentfee.com spanning data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced uniformly at $0.02 per request. The specific endpoint `/api/v1/wallet/FIL/balance` sits in the Finance & Web3 category and is designed to return balance information for Filecoin wallets. Payment settles in USDC (contract 0x8335…2913) on Base using the \"exact\" x402 scheme, with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nDocumentation on the site is extremely sparse — the docs, pricing, and API 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 is confirmed live (returns a proper 402 challenge), but the actual request format (e.g., whether a wallet address is passed in the body or URL) and response schema are unknown.","tags":[],"capabilities":["fil-wallet-balance","x402-payment","usdc-base-settlement","pay-per-call","no-api-key"],"categories":["crypto","finance"],"synonyms":["Filecoin balance","FIL wallet lookup","crypto wallet balance","Filecoin address balance","blockchain balance check","FIL balance API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","Docs, pricing, and API pages on the site render only a 'Connect wallet' prompt with no technical content","Example request JSON is speculative; actual required fields are undocumented","The broader site lists many API categories but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wallet/FIL/balance","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/wallet/FIL/balance","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 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no usage examples, and the docs pages are empty stubs. The request body format and response structure are entirely 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'0.02':50,114,161 '000':157 '0x8335':142 '20':156 '2913':143 '402':217 '6':165 'FIL balance API' 'FIL wallet lookup' 'Filecoin address balance' 'Filecoin balance' 'access':41 'actual':221 'address':228 'ai/ml':103 'amount':154 'analyt':102 'api':58,96,178 'avail':204 'balanc':5,20,39,132 'base':15,30,55,145,158 'blockchain balance check' 'bodi':233 'broader':93 'call':11,26,48 'caller':68 'categori':126 'challeng':218 'check':1,16 'confirm':212 'connect':184 'contract':141 'cost':49 'crawl':207 'crypto wallet balance' 'data':40,101,106 'decim':166 'design':129 'detail':191 'doc':175 'document':167 'e.g':224 'endpoint':13,28,32,88,119,210 'exact':148 'exampl':203 'extrem':172 'fil':3,18,37 'fil-wallet-balance' 'filecoin':2,17,36,135 'financ':124 'finance/web3':105 'format':223 'given':162 'header':75 'i.e':160 'includ':70 'infer':104 'inform':133 'json':85 'key':59 'limit':62 'live':213 'lowpaymentfee.com':34,99 'materi':208 'maximum':153 'network':56 'no-api-key' 'offer':97 'openapi':195 'page':179 'part':90 'pass':230 'pay':9,24 'pay-per-cal':8,23 'pay-per-call' 'payment':45,74,80,137 'per':10,25,115 'price':111,176 'prompt':186 'proof':81 'proper':216 'protocol':46 'rate':61 'receiv':83 'render':181 'request':116,222 'request/response':198 'requir':66 'respons':86,237 'return':35,131,214 'schema':199,238 'scheme':150 'servic':109 'settl':138 'simpli':69 'sit':121 'site':170 'span':100 'spars':173 'spec':196 'specif':118 'subscript':65 'suit':94 'technic':190 'uniform':112 'unit':159 'unknown':240 'url':235 'usag':202 'usdc':52,140,163 'usdc-base-settlement' 'use':146 'util':108 'valid':78 'via':6,21,42 'wallet':4,19,38,136,185,227 'web3':125 'whether':225 'x':73 'x-payment':72 'x402':12,27,44,79,149 'x402-payment'","prices":[{"id":"599081fd-445a-4b69-8d4b-64d566a0acf1","listingId":"036aab65-6b93-490c-a07a-8d08f111a309","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/wallet/FIL/balance","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:15.459Z"}],"sources":[{"listingId":"036aab65-6b93-490c-a07a-8d08f111a309","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wallet/FIL/balance","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:15.459Z","lastSeenAt":"2026-04-23T12:32:03.024Z"}],"details":{"listingId":"036aab65-6b93-490c-a07a-8d08f111a309","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wallet/FIL/balance \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{\"address\": \"f1...\"}'","exampleRequest":{"address":"f1examplefilecoinaddress"},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 challenge with x402Version 1, scheme 'exact', network 'base', maxAmountRequired 20000 USDC","source_url":"https://lowpaymentfee.com/api/v1/wallet/FIL/balance"},{"claim":"All APIs on the site are 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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wallet/FIL/balance"}],"useCases":["Querying the balance of a Filecoin wallet address programmatically","Integrating FIL balance checks into a portfolio tracker or dashboard","Automated monitoring of Filecoin wallet balances in agent workflows"],"bestFor":["Agents or apps needing on-demand FIL balance lookups without managing API keys","Developers who want pay-per-call crypto data without subscriptions","x402-native workflows settling micropayments on Base"],"notFor":["Bulk or high-frequency balance polling where per-call fees add up quickly","Users who need detailed FIL transaction history or on-chain analytics beyond balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:32.781Z"},"updatedAt":"2026-04-23T12:32:03.024Z"}}