# xx402 Base Protocol Fee Quality Feed

> xx402 Base Protocol Fee Quality Feed is a paid API for AI agents from x402.xx402.icu, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Returns ranked fee-quality assessments, risk breakdowns, and prioritized queues for DeFi protocols on the Base blockchain, filtered by TVL and fee thresholds.

## Facts

- Endpoint: GET https://x402.xx402.icu/api/base-protocol-fee-quality-feed?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/xx402-base-protocol-fee-quality-feed-55231127
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pQR4pW-ic64vmhTLVUwYc

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability xx402-base-protocol-fee-quality-feed-55231127
```

Example prompt: Give me the top 15 Base DeFi protocols ranked by fee quality — include Dexs and Lending categories, require at least $2M TVL and $5,000 in 30-day fees, and flag any with incident or avoid signals.

## When to prefer this

Choose this endpoint when you need a structured, ranked risk-and-fee-quality assessment of Base DeFi protocols for autonomous capital allocation, risk gating, or protocol comparison — especially when you need categorized queues (priority, avoid, review) rather than raw fee data. Prefer over generic DeFi data feeds when you specifically need fee quality scoring, incident context, and multi-bucket prioritization for Base chain protocols.

## Known failure modes

- No protocols match the specified filters (empty queues returned)
- Payment not completed via x402 — returns 402 Payment Required
- Invalid category or project slug returns empty or partial results
- Data source unavailable — source_status field may indicate degraded feeds
- Limit parameter out of range (must be 3–30) returns validation error

## 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

A JSON object containing a summary, fee_quality_decision, categorized queues (priority, review, avoid, low_fee_tvl, fee_decline, high_fee), risk_breakdown, incident_context, protocol_context, bucket_counts, and source_status — giving a comprehensive ranked view of Base DeFi protocol fee quality and risk.

## Response schema (JSON Schema)

```json
{
 "keys": [
  "summary",
  "fee_quality_decision",
  "priority_queue",
  "risk_breakdown",
  "fee_quality_queue",
  "review_queue",
  "fee_quality_review_queue",
  "avoid_queue",
  "low_fee_tvl_queue",
  "fee_decline_queue",
  "high_fee_protocols",
  "protocol_context",
  "incident_context",
  "bucket_counts",
  "source_status",
  "sources"
 ],
 "type": "json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/xx402-base-protocol-fee-quality-feed-55231127/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.xx402.icu](https://www.zero.xyz/host/x402.xx402.icu/llms.txt)