← the tool · for judges · no login, no key, no setup

Paste “Smart Money is buying $X”. Six Nansen calls decide whether it's true — and show their work.

One sentence in → one of four words out (CONFIRMED · OVERSTATED · CONTRADICTED · UNVERIFIABLE) with the numbers that fired the rule, a sha256 of the evidence, and the full tool trace. The verdict is arithmetic over Nansen label-class flows; an LLM only reads the claim and writes two sentences, and a rules extractor plus a template take over when it is down. This is not a wrapper around Nansen's agent — the button that runs agent/fast prints its 200-credit price and shows the two traces side by side.

The 30-second path

Open https://rebuttal.edycu.dev/?q=Smart Money is aping $PEPE…. The claim card reads Smart Money · buying · PEPE (ethereum, most traded of the same-name tokens — 14 at the recording, 13 on 2026-09-19), six trace rows land as each call returns, and the verdict card turns red: CONTRADICTED · C-NOBODY — no Smart Money wallet traded PEPE in 24 h while 89 Smart Money traders sit on its table. Cold ≈ 4 s, cached ≈ 0 s.
Press Ask Nansen's agent (200 credits, printed on the button): Nansen's own agent/fast streams its tool_calls into the violet panel beside our trace. Two agents, same claim, two traces.
Open https://rebuttal.edycu.dev/?q=A whale sold 600,000 UNI…— a claim the tool CONFIRMS (whale holders' balances fell $548K in 24 h at the recording (fixtures/uni-whale-sold.json; $532K on the DEMO run — flows are priced live)), so it is seen agreeing, not just contradicting.
Open https://rebuttal.edycu.dev/api/rebut?q=… — the same verdict as JSON, same hash as the CLI prints.

Receipts

Hero claim, live	`Smart Money is aping $PEPE hard today 🐋`: 10 credits · 7 calls · 3.5 s cold · 2026-09-18 · CONTRADICTED / C-NOBODY · hash `e21a8a19ae59` (recorded fixture; the DEMO run printed `4f3cce391567` before the hash record gained the whale fields) — output verbatim in DEMO.md, recorded in `fixtures/pepe-aping.json`
Spike, 10 real claims	Posts from Lookonchain / OKX feeds, 2026-09-14 → 18: 7/10 decisive; the three UNVERIFIABLE are refusals with a reason (Zcash is not a Nansen chain; EDEL and MEME have no Whale-labelled wallet at all). Extraction: LLM 10/10, rules 10/10, agreeing on token and type 10/10.
Benchmark, live	13 claims × 2 cold runs: cold p50 4.0 s · p95 5.0 s · warm p50 2 ms · mean 10.0 credits, max 15 per rebuttal; 0 of 154 live calls failed — docs/BENCH.md is the script’s output
Nansen endpoints	`search/general` · `tgm/flow-intelligence` (1d + 7d) · `tgm/who-bought-sold` (BUY + SELL, Smart Money label filter) · `smart-money/netflow` · `tgm/token-ohlcv` · `tgm/holders` · `agent/fast` (button only) — every rule input is one of their response fields
Tests	226 tests (vitest): the extractor on every spike claim, every rule with live-shaped evidence, the client's retry and cache, the SSE parser, the oEmbed path, a route boundary suite · 23,000 generated cases on `decide()` and `extractClaim()` (fast-check: purity, the buying/selling mirror, never-throws)
Determinism	13 recorded rebuttals replay offline with the same label, rule and hash, zero network, zero credits, zero LLM (`npm run verify`)
Spend guard	10 checks per IP per minute, 2,000 live credits per day, then recorded replays (labelled); the agent button 2 per IP and 4 per day (`apps/web/lib/guard.ts`)

Reproduce (real Nansen calls, one env var)

git clone https://github.com/edycutjong/rebuttal.git && cd rebuttal
npm install
export NANSEN_API_KEY=nsn_…            # https://app.nansen.ai/api — the only required key
npm run rebuttal -- "Smart Money is aping $PEPE hard today 🐋" --explain   # ≤ 15 credits, ~4 s
npm run verify                          # 13/13 recorded rebuttals replayed offline, 0 credits, 0 network
npm test                                # 226 tests

Optional: export GROQ_API_KEY=… turns on the LLM extractor and the two-sentence prose (Groq, openai/gpt-oss-120b); without it the rules extractor and the template run and the output says so. --ask-nansen adds the agent/fast comparison (200 credits).

Three limitations, stated

“Smart Money” means Nansen's Smart Trader flow columns plus the Fund / Smart Trader rows named in the trace. Funds have no separate flow-intelligence column; the who-bought-sold filter covers them.
Nansen's Whale label is sparse. A post's “whale” is often a big wallet Nansen does not tag; when no Whale-labelled wallet exists in the token the tool says UNVERIFIABLE rather than pretending a CONTRADICTED.
Net flows are priced at current rates and drift by the minute. The hash covers integers of the numbers that decided the label; a fixture replay always matches, a live re-run usually does, and the label holds.

Paste “Smart Money is buying $X”. Six Nansen calls decide whether it's true — and show their work.

The 30-second path

Receipts

Reproduce (real Nansen calls, one env var)

Three limitations, stated

Links