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xx402 Base Token Holder Sketch API
x402
xx402 Base Token Holder Sketch API is a paid API for AI agents from x402.xx402.icu, paid per call via x402, $0.01/call, status down (last checked 2026-10-24).
Returns a probabilistic sketch of ERC20 token holder concentration, whale candidates, and transfer activity on the Base chain for risk analysis.
Price / call$0.01
Success—
StatusDown
How this service works
Paid Base token, wallet, DeFi, chain-read, x402 buyer/seller discovery, and specialized Bitcoin 15-minute Up/Down prediction-market data packets for autonomous agents and risk tools.
Output
Returns a JSON object containing: a summary, holder concentration decision, priority/review/avoid queues, top observed holders, active whale candidates, contract holder candidates, recent transfer samples, bucket counts, risk flags, risk score, source status, best next products, and a not-financial-advice disclaimer.
Example use cases
Pre-investment whale concentration check
“Before I ape into this new Base token at 0xAbCd1234abcd1234abcd1234abcd1234abcd1234, can you pull a holder sketch over the last 200 blocks and show me whether whales dominate the supply? I want to see the concentration breakdown and any risk flags.”
DeFi protocol token risk screening
“I'm building a risk dashboard for Base DeFi tokens — can you run a holder sketch on 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with up to 20 holder candidates over a 300-block window so I can flag any tokens with dangerous whale concentration?”
Recent transfer activity monitoring
“Can you check the recent transfer sample and active whale candidates for this Base token at 0x4200000000000000000000000000000000000006 over the last 100 blocks? I want to know if there's been unusual large-wallet movement lately.”
Technical details
Endpoint
GEThttps://x402.xx402.icu/api/base-token-holder-sketch?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast probabilistic sketch of token holder concentration on the Base chain without running a full indexer query. It is well-suited for pre-trade risk checks, whale dominance screening, and autonomous agent workflows where a $0.01 per-call micropayment via x402 is acceptable. Prefer this over full indexer solutions when speed, cost, and autonomous payment are priorities over exhaustive accuracy.
Side effects
- Invalid token_address format (not a valid 0x ERC20 address) returns error
- window_blocks below minimum of 100 or above 1000 returns validation error
- limit outside 1-20 range returns validation error
- Payment not accepted or insufficient USDC returns 402
- Token with no recent on-chain activity may return empty holder lists
- Network congestion on Base may cause delayed or incomplete data
Output
Schema · Response
{
"keys": [
"summary",
"purchase_acceptance",
"buyer_next_action",
"next_paid_call",
"decision_evidence",
"repeat_purchase_guard",
"holder_concentration_decision",
"priority_queue",
"best_next_products",
"concentration_breakdown",
"review_queue",
"avoid_queue",
"top_observed_holders",
"active_whale_candidates",
"contract_holder_candidates",
"recent_transfer_sample",
"bucket_counts",
"risk_flags",
"risk",
"source_status",
"not_financial_advice",
"sources"
],
"type": "json"
}Tags
x402
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