Nansen x402 API vs Yield.xyz MCP server

Nansen x402 API 45

We found no status page. status.nansen.ai still doesn't resolve on 1 November, and neither the API docs, llms.txt nor the site link one (0). No readable incident history (5). Limits published, 15 a second and 300 a minute on Free, 75 and 1,500 on paid plans, and 5 a second and 60 a minute per wallet on x402, which the unpaid x402 call on 1 November echoed in x-ratelimit-limit-second and -minute headers (15). 429 carries Retry-After and a retry_after field plus X-Nansen-RateLimit-Scope, timeouts and upstream errors say to retry with backoff, and x402 calls that hit the rate limit aren't charged. Every call is a read (15). No SLA found (0). We found no beta or preview label on the x402 route (10). 0 + 5 + 15 + 15 + 0 + 10 = 45.

Yield.xyz MCP server 65

Status page at status.yield.xyz, all services online, with a notice on protocol-level Aave pauses (20). History not read (5). Plan rate limits with headers documented, and the MCP free quotas published with numbers (15). 429 with retry-after and a retry strategy documented; transactions are built unsigned and never broadcast (15). No SLA read (0). Not labelled beta (10). 20 + 5 + 15 + 15 + 0 + 10 = 65.

Nansen x402 API 75

Changelog entries on 30 October 2026, the newest of them a labelled breaking change to who-bought-sold (30). 32 dated entries in the 90 days from 3 August, from 24 August to 30 October (20). Public changelog and docs that answer questions through ?ask=. We didn't test support (10). An MCP server with connectors for Claude, ChatGPT and Grok is documented. We didn't verify official SDKs (10). No public package to check (5). 30 + 20 + 10 + 10 + 5 = 75.

Yield.xyz MCP server 60

Weekly changelog entries into November 2026 (30). More than three dated entries in 90 days (20). Docs, a trust page and support; issues not public (10 of 15). Not found in our import of the official registry (0). No package health read (0). 30 + 20 + 10 + 0 + 0 = 60. Registry presence read from Anchor Terminal's own daily import of the official MCP registry (/api/v1/registry.json, 6 November 2026), not the registry's API.

Nansen x402 API 84

Each endpoint page embeds an OpenAPI 3.1 definition. We found no single downloadable spec (22). llms.txt at docs.nansen.ai, Markdown copies of every page and a ?ask= query on the docs (10). Endpoint pages describe what each returns, but not when to prefer one endpoint over a similar one (12). Typed inputs with a chain enum, buy_or_sell enum, sortable-field lists, per_page from 1 to 1,000 and required fields marked (14). An error catalogue with stable codes, request_id, doc_url and param. The who-bought-sold page has no worked request or response example (11). Dated changelog with one page per change (15).

Yield.xyz MCP server 95

22 tools read from tools/list with JSON Schema inputs and 14 enums (25). llms.txt (10). Descriptions with order of use, such as yields_get before actions_enter (18 of 20). Typed inputs with enums, ranges and defaults (15). A tool reference with inputs and returns for every tool (12 of 15). Weekly dated product changelog (15). 25 + 10 + 18 + 15 + 12 + 15 = 95.

Nansen x402 API 45

The x402 route needs no credential, so nothing leaks beyond the paying wallet. The keyed API uses one account key with no scopes we could find (15). Read-only data, and each x402 call costs a fixed $0.01 or $0.05 (15). Responses include token names and symbols that their creators set, alongside Nansen's own labels, with no injection guidance (7). Credit cost comes back in response headers and each x402 payment is on chain (8). We found no security page, disclosure policy or certification in the docs or on nansen.ai (0).

Yield.xyz MCP server 56

Keyless shared access, x402, or your own key in a header; the key can also go in a query string, a documented option (10 of 30, a plain key less 10 for the query string). Mostly reads, and wallet tools build unsigned transactions the user signs elsewhere (18 of 20). Returns protocol data, no third-party prose (10). No audit log of MCP calls (0). SOC 2 Type II, penetration tests by Spearbit/Cantina and Trail of Bits, audited contracts (18 of 20). 10 + 18 + 10 + 0 + 18 = 56.

Nansen x402 API 95

x402 on Nansen's own api.nansen.ai for every Pro endpoint except labels, 17 at $0.01 and the Premium and Smart Money endpoints at $0.05. An unpaid call to current-balance on 1 November answered 402 with an x402 v2 PAYMENT-REQUIRED header asking $0.01 in eight ways, USDC on Base, Monad and Solana, USD₮0 on X Layer and four stablecoins on BNB Chain. The docs still name only Base, Solana and Monad. MPP on Tempo is documented for the same endpoints. Labels are excluded, and the 200 to 750-credit agent endpoints don't appear in the x402 tiers (35). Per-call prices published without login (20). Free plan with 100 trial credits and a daily top-up to 10, with no payment required (20). The docs call x402 "fully permissionless", a wallet with USDC is enough (20). 35 + 20 + 20 + 20 = 95.

Yield.xyz MCP server 100

x402 on its own MCP endpoint for metered tools over quota (40). $0.001 a call published, with machine-readable pricing at /.well-known/x402 (20). 1,000 free read calls a tool a day with no sign-up (20). Keyless use and x402 let an agent start with no person (20). 40 + 20 + 20 + 20 = 100.