# flexyield.io — blockchain and web3 — 2 of 5

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> Probe-verified (tier 2 of 3). Last checked 2026-09-26. 2 of 5 capability checks passed. 2 unknown.

- host: flexyield.io
- url: https://flexyield.io/
- category: blockchain and web3
- type: saas

## Probe-verified · tier 2 of 3

Probed live on 2026-09-26 against rubric v1.2. 2 of 5 checks passed. 2 unknown.

- UNKNOWN — Markdown negotiation (`Accept: text/markdown`)
- UNKNOWN — Markdown twin at a predictable URL (`/page.md`)
- FAIL — llms.txt (`/llms.txt`)
- PASS — API catalog (`RFC 9727`)
- PASS — MCP endpoint answers tools/list (`initialize → tools/list, no credentials`) · on 26 Sep 2026
  - PRESENT — MCP server card (`/.well-known/mcp/server-card.json`): present; its server answers; not scored
  - Platform-supplied: no; not scored
- PASS — Other agent files at well-known paths (`agent-skills/index.json · oauth-authorization-server · oauth-protected-resource · http-message-signatures-directory`): found: Agent Skills index; not scored

MCP tools (from tools/list on 2026-09-26): get_key, bind_key_start, bind_key_complete, claim_agent_start, claim_agent_complete, create_api_key, configure_key, revoke_api_key, list_api_keys, get_billing_status, configure_services, update_account, join_enterprise_wishlist, join_waitlist, list_plans, get_usage, get_statement, manage_tickets, manage_feedback, get_balances, get_history, get_prices, get_tx_status, resolve_ens, get_abi, decode_calldata, convert_evm, verify_signature, what_can_i_do, get_quote, explain_error, recommend, migrate, buy_pack, rpc_call

## Unverified actions

Read from the page's own content, with the wording each was drawn from. Inference is kept separate from tested facts; an agent completing the action is tier 3.

- **quote** — "" → `https://flexyield.io/mcp`
- **register** — "" → `https://flexyield.io/registration/new`

## Summary

Blockchain RPC gateway providing multi-chain JSON-RPC access with automatic multi-provider failover, usage metering, and a public status page. Supports six mainnets including Ethereum, Polygon, Solana, Arbitrum, Base, and Optimism. Offers API keys without signup and pay-per-call in USDC.

## Context

353 sites in this index share the category "blockchain and web3"; 30 are transactional.

## How we grade

- tier 1 — **Declared**: The site says agents are welcome in its robots.txt. A permission, not a capability.
- tier 2 — **Probe-verified** (this site): We fetched the site and tested each signal ourselves. Dated, repeatable, re-checked on a schedule.
- tier 3 — **Behaviourally verified**: An agent completed the action end to end — booked, bought, submitted — and it worked.

## About this record

Known Good probes sites live and publishes what was tested and when.
Method: https://knowngood.sh/about.md · Rubric: https://knowngood.sh/benchmark

How we found this site: probe discovery. This site didn't declare agent access — we found it by checking the open web. Everything above was tested the same way, against the same rubric, on the date shown. [How we choose what to check, and how to opt out](https://knowngood.sh/bot)

## Where this sits

- saas: https://knowngood.sh/type/saas
- blockchain and web3: https://knowngood.sh/category/blockchain-web3
- Browse: https://knowngood.sh/browse
- Rubric: https://knowngood.sh/benchmark