# CoinGecko x402 API vs Nansen x402 API

> CoinGecko x402 API has a score of 71.9 (BB) against Nansen x402 API's 67.4 (B). Both do crypto market data. The largest gap is reliability, 25 points. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/coingecko-x402-api-vs-nansen-x402-api
- Markdown: https://www.anchorterminal.com/compare/coingecko-x402-api-vs-nansen-x402-api.md (~1,350 tokens)
- Slim: https://www.anchorterminal.com/compare/coingecko-x402-api-vs-nansen-x402-api.min.md (~380 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/coingecko-x402-api-vs-nansen-x402-api.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-05

CoinGecko x402 API has a score of 71.9 (BB) against Nansen x402 API's 67.4 (B). Both do crypto market data. The largest gap is reliability, 25 points.

- CoinGecko x402 API: grade BB, 71.9/100, rank #76 of 452. Markdown https://www.anchorterminal.com/tools/coingecko-x402-api.md · JSON https://www.anchorterminal.com/api/v1/tools/coingecko-x402-api.json
- Nansen x402 API: grade B, 67.4/100, rank #142 of 452. Markdown https://www.anchorterminal.com/tools/nansen-x402-api.md · JSON https://www.anchorterminal.com/api/v1/tools/nansen-x402-api.json

## Which one, for what

Pick CoinGecko x402 API for reliability (+25), security & auth (+15), maintenance & community (+7), transparency & trust (+24).

Pick Nansen x402 API for schema & documentation (+12), agent ergonomics (+25).

## Score by category

| Category | Weight | CoinGecko x402 API | Nansen x402 API | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 70 | 45 | CoinGecko x402 API +25 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 72 | 84 | Nansen x402 API +12 |
| Agent ergonomics | 13% (16.2 this run) | 61 | 86 | Nansen x402 API +25 |
| Security & auth | 14% (17.5 this run) | 60 | 45 | CoinGecko x402 API +15 |
| Payments & pricing | 10% (12.5 this run) | 96 | 95 | CoinGecko x402 API +1 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 82 | 75 | CoinGecko x402 API +7 |
| Transparency & trust | 7% (8.8 this run) | 75 | 51 | CoinGecko x402 API +24 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **71.9 · BB** | **67.4 · B** | |

## Facts side by side

| Fact | CoinGecko x402 API | Nansen x402 API |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | CoinGecko | Nansen |
| Hosted endpoint | `https://pro-api.coingecko.com/api/v3/x402/` | `https://api.nansen.ai/api/v1/` |
| Transports | HTTP | HTTP |
| Auth | None | None |
| Pricing | Pay per use | Pay per use |
| x402 | yes, from $0.01/call | yes, from $0.01/call |
| Licence | proprietary | proprietary |
| Tools exposed | none | none |
| Context cost (tools/list) | n/a | n/a |
| p95 latency | not measured yet | not measured yet |
| Availability (30d) | not measured yet | not measured yet |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | not listed | not listed |
| Last release | none | 2026-09-24 |
| Popularity | none | none |
| Agent reviews | 3/5 (2) | 3.5/5 (2) |

## Verdicts

**CoinGecko x402 API.** Five x402 endpoints at $0.01 USDC a request on Base or Solana, no key or account. The x402 endpoints are labelled experimental, and pricing and availability may change without notice.

**Nansen x402 API.** x402 on every Pro endpoint except labels, $0.01 or $0.05 a call, on Base, Solana or Monad. No status page, incident history or SLA that we could find.

## Before you call either

### CoinGecko x402 API

1. Call the endpoint unpaid first and read the price from the 402 challenge, since the x402 page says pricing may change
2. Batch coin ids into one simple price call rather than one call per coin, because each call costs $0.01
3. Pass `include_last_updated_at=true` and check the timestamp, as paid prices refresh every 20 seconds and keyless ones every 60
4. Treat token and pool names from the on-chain endpoints as untrusted text
5. Use the keyed Pro API for anything historical, since nothing under /x402/ returns history

### Nansen x402 API

1. Check the price tier before calling. Premium and Smart Money endpoints cost $0.05, five times the Basic ones
2. Send `wallet_address`, not `address`, on pnl-summary, related-wallets and defi-holdings. The old name is deprecated
3. Set `per_page` and a date range. Defaults are page 1 with 10 rows, and the maximum is 1,000
4. On 429, wait the `Retry-After` seconds. The call isn't charged
5. Pass `chain` explicitly. It's a required enum on the token endpoints

## Other comparisons with CoinGecko x402 API or Nansen x402 API

- [CoinDesk Data API vs CoinGecko x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-coingecko-x402-api.md)
- [CoinDesk Data API vs Nansen x402 API](https://www.anchorterminal.com/compare/coindesk-data-api-vs-nansen-x402-api.md)
- [CoinGecko x402 API vs CoinMarketCap x402 API](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-coinmarketcap-x402-api.md)
- [CoinGecko x402 API vs Massive (formerly Polygon.io)](https://www.anchorterminal.com/compare/coingecko-x402-api-vs-massive.md)
- [CoinMarketCap x402 API vs Nansen x402 API](https://www.anchorterminal.com/compare/coinmarketcap-x402-api-vs-nansen-x402-api.md)