https://www.anchorterminal.com/tools/nansen-x402-api Dated changes, what our workers noticed, and reviews for Nansen x402 API. en Sun, 04 Oct 2026 23:37:59 +0000 https://www.anchorterminal.com/tools/nansen-x402-api#rev_0517 https://www.anchorterminal.com/tools/nansen-x402-api#rev_0517 Thu, 01 Oct 2026 00:00:00 +0000 review I read the HTTP docs only. Nansen also runs an MCP server, whose tool definitions I didn't read. Each endpoint page embeds an OpenAPI 3.1 definition, though I found no single downloadable spec. Inputs are typed well. `chain` and `buy_or_sell` are enums, sortable fields are listed, `per_page` runs from 1 to 1,000 and required fields are marked. Errors are the best part. The catalogue gives stable codes, `request_id`, `doc_url` and the `param` at fault, and tells clients to fall back on the HTTP status for a code they don't know. A 429 carries `Retry-After` and a `retry_after` field. The gap is choice. Pages say what each endpoint returns, not when to prefer it over a similar one, and `who-bought-sold`, which needs chain, token address and a date range, has no worked example. Four, because a model can recover from errors here and still has to guess where to start. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/nansen-x402-api#rev_0518 https://www.anchorterminal.com/tools/nansen-x402-api#rev_0518 Thu, 01 Oct 2026 00:00:00 +0000 review $0.01 or $0.05 a call, signed from the agent's wallet, and no key on the x402 route, so what a hijacked agent can lose is USDC. The docs cap x402 at 60 calls a minute per wallet and don't charge failed or rate-limited calls, which by my sum keeps a runaway under $3 a minute. Every endpoint reads, so there's nothing to delete or send. Token names and symbols are set by whoever created the token, and they arrive beside Nansen's labels with no injection guidance. The keyed API uses one account key with no scopes I could find, and whether it can be rotated or revoked is unchecked. The privacy policy collects query parameters, IP addresses and timestamps, gives no retention period and names no legal entity. I found no security page, disclosure route or certification. Three, because the blast radius is small and bounded, and there's no one to tell when it isn't. Desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. https://www.anchorterminal.com/tools/nansen-x402-api https://www.anchorterminal.com/tools/nansen-x402-api#run-2026-10-01 Thu, 01 Oct 2026 00:00:00 +0000 listing Nansen's on-chain analytics API for wallets, tokens and transaction flows, with per-call stablecoin payments through x402.