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GraphAdvocate x402 Settlement Q&A
x402
GraphAdvocate x402 Settlement Q&A is a paid API for AI agents from graphadvocate.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).
Natural-language Q&A over 132M x402 Base settlement rows, returning an answer, the SQL trace used, and upstream latency.
Price / call$0.05
Success—
StatusUnknown
How this service works
Natural-language Q&A over the x402 Base settlements warehouse. POST {question}. Backed by 132M settlement rows on Cloudflare R2 + pre-aggregated daily_stats (388 days, May 2025 - Jun 2026), queried via Anthropic Sonnet + DuckDB. Returns {answer, sql_trace, model, upstream_ms}; sql_trace lets the caller verify the data path is real, not hallucinated. $0.05 USDC on Base.
Output
Returns a JSON object with: `answer` (natural-language response to the question), `sql_trace` (the exact DuckDB SQL query executed so the caller can verify the data path), `model` (the Anthropic model used), and `upstream_ms` (query latency in milliseconds). Covers 132M settlement rows and 388 days of pre-aggregated daily_stats (May 2025–Jun 2026).
Example use cases
Example prompt
“How much total USDC was settled through x402 on Base in May 2025, and which day had the highest volume? I want to see the SQL trace so I can verify the query.”
Technical details
Endpoint
POSThttps://graphadvocate.com/askWhen to prefer
Use this endpoint when you need auditable, SQL-verifiable answers about x402 Base settlement data at scale. It is the only service with 132M settlement rows queryable via natural language with a sql_trace for verification — ideal for agents that need to cross-check on-chain payment analytics without hallucination risk.
Side effects
- Question is too ambiguous for the model to generate valid SQL — returns an error or empty answer
- DuckDB query times out on very broad aggregations over 132M rows
- x402 settlement data not yet available for requested date range (only May 2025–Jun 2026)
- Invalid or malformed POST body — missing `question` field
- Payment not confirmed — x402 $0.05 USDC charge fails, request rejected
Input
{
"question": "What was the total USDC volume settled through x402 on Base in May 2025?"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| question | string | Plain-English question about x402 Base settlements |
Output
{
"model": "claude-sonnet-4-6",
"answer": "Here's the summary for **May 2025** on Base:\n\n| Metric | Value |\n|---|---|\n| 💰 Total USDC Volume | **$110.86 USDC** |\n| 📄 Total Settlements | **702** |\n| 📅 Days with Activity | **21 out of 31** |\n\nA few notes:\n- The dataset begins on **May 9, 2025**, so only the final ~23 days of May are captured (21 of which had settlement activity). The first ~8 days of May are outside the dataset range.\n- All settlements use **USDC** (on Base mainnet) via the **EIP-3009** authorization flow.\n- The relatively modest volume reflects the early days of the x402 protocol, which was just getting started in this period.",
"dataset": "base-x402-settlements via x402-watch.vercel.app",
"question": "What was the total USDC volume settled through x402 on Base in May 2025?",
"sql_trace": [
{
"ms": 960,
"sql": "SELECT\n SUM(total_usdc) AS total_usdc_volume,\n SUM(settlement_count) AS total_settlements,\n COUNT(*) AS days_counted\nFROM daily_stats\nWHERE day >= '2025-05-01'\n AND day < '2025-06-01'",
"rows": 1
}
],
"upstream_ms": 9183,
"generated_at": "2026-06-12T04:16:45.019407+00:00"
}Schema · Response
{
"type": "json",
"example": {
"model": "claude-sonnet-4-6",
"answer": "# Top 10 recipients\n| Rank | Address | Count | USDC |\n...",
"dataset": "base-x402-settlements via x402-watch.vercel.app",
"question": "Top 10 recipient addresses last 30 days",
"sql_trace": [
{
"ms": 1350,
"sql": "SELECT recipient, COUNT(*) AS payment_count, SUM(amount::DECIMAL(38,0))/1e6 AS usdc_total FROM settlements WHERE block_number >= 45553999 GROUP BY recipient ORDER BY payment_count DESC LIMIT 10",
"rows": 10
}
],
"upstream_ms": 3500
}
}Tags
x402
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