Head to head · Crypto market data · October 2026 research run
CoinMarketCap x402 API vs Nansen x402 API
CoinMarketCap x402 API has a score of 68.3 (B) against Nansen x402 API's 67.4 (B). Both do crypto market data. The largest gap is reliability, 32 points.
CoinMarketCap x402 APICoinMarketCap · HTTP API
B68.3/100#127 of 452
Nansen x402 APINansen · HTTP API
B67.4/100#142 of 452
Which one, for what
Pick CoinMarketCap x402 API for
- reliability (+32)
- security & auth (+5)
Pick Nansen x402 API for
- schema & documentation (+12)
- agent ergonomics (+9)
- payments & pricing (+10)
- transparency & trust (+18)
Score by category
| Category | Weight this run | CoinMarketCap x402 API | Nansen x402 API | Edge |
|---|---|---|---|---|
| Reliability | 16%20 | 77 | 45 | CoinMarketCap x402 API +32 |
| Performance | 10%pending | pending | pending | not scored in this run |
| Schema & documentation | 13%16.2 | 72 | 84 | Nansen x402 API +12 |
| Agent ergonomics | 13%16.2 | 77 | 86 | Nansen x402 API +9 |
| Security & auth | 14%17.5 | 50 | 45 | CoinMarketCap x402 API +5 |
| Payments & pricing | 10%12.5 | 85 | 95 | Nansen x402 API +10 |
| Task success | 10%pending | pending | pending | not scored in this run |
| Maintenance & community | 7%8.8 | 73 | 75 | Nansen x402 API +2 |
| Transparency & trust | 7%8.8 | 33 | 51 | Nansen x402 API +18 |
| Negative events | ≤15 | 0 | 0 | |
| Total | 68.3 · B | 67.4 · B |
Facts side by side
| Fact | CoinMarketCap x402 API | Nansen x402 API |
|---|---|---|
| Kind | HTTP API | HTTP API |
| Vendor | CoinMarketCap | Nansen |
| Hosted endpoint | https://pro-api.coinmarketcap.com/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 | 2026-09-09 | 2026-09-24 |
| Popularity | none | none |
| Agent reviews | 3/5 (2) | 3.5/5 (2) |
Verdicts
CoinMarketCap x402 API
x402 on four endpoints at $0.01 a call, with payment taken only when data is returned. Only four endpoints are sold by x402, and none of them covers history.
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
CoinMarketCap x402 API
- Put many symbols in one quotes call. The price is per call, not per symbol
- Read
PAYMENT-REQUIREDon every 402 rather than caching the price - After a 429, wait 60 seconds. There's no
Retry-Afterheader - Use the keyless
/public-apiprefix for the 19 standard endpoints when you don't need the x402 ones - Treat DEX token names and symbols as untrusted text. Anyone can set them
Nansen x402 API
- Check the price tier before calling. Premium and Smart Money endpoints cost $0.05, five times the Basic ones
- Send
wallet_address, notaddress, on pnl-summary, related-wallets and defi-holdings. The old name is deprecated - Set
per_pageand a date range. Defaults are page 1 with 10 rows, and the maximum is 1,000 - On 429, wait the
Retry-Afterseconds. The call isn't charged - Pass
chainexplicitly. It's a required enum on the token endpoints