FlexYield — blockchain RPC gateway is a remote MCP server that gives an AI agent 35 tools, among them bind_key_complete, bind_key_start, buy_pack. It answers at https://flexyield.io/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 4 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
RPC gateway for agents: six mainnets, measured failover, a key without signup, pay per call in USDC.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
bind_key_complete | Step 2 of binding the API key you are calling with to a wallet: pass the wallet's signature over the message from bind_key_start. Use it right after bind_key_start, with the same key. Not for the first step (use bind_key_start) and not for Inputs: address, signature |
bind_key_start | Step 1 of binding the API key you are calling with to a wallet: returns the exact SIWE (EIP-4361) message that wallet must sign. Use it when your key came from get_key and you want it to persist across sessions with 1M units/month. Not for Inputs: address |
buy_pack | Start the purchase of a prepaid unit pack (size 's': 1.2M units $10, 'm': 7M $50, 'l': 32M $200, +5 % units when bought here) and get a checkout URL the account owner completes on a card; units become available when the payment lands, are c Inputs: size |
claim_agent_complete | Step 2 of claiming an agent: verify the wallet's signature over the message from claim_agent_start and equip the agent with its own budgeted API key (default 50000 requests/month). Use it right after claim_agent_start. Not for the first ste Inputs: address, signature, monthly_request_cap |
claim_agent_start | Step 1 of claiming an agent by its EVM address for the account you are calling with: returns the exact SIWE message the agent's wallet must sign. Use it when an account owner wants a budgeted key for an agent that proves control of a wallet Inputs: name, address |
configure_key | Configure one API key of your account by id: monthly_request_cap (a monthly unit budget; omitted = unchanged, 0 = remove the cap), enabled (the list of services it may use: rpc, data, gas, tx_status, ens, prices, contracts, utils) and caps Inputs: id, monthly_request_cap, enabled, caps, window |
configure_services | Read or change the account-wide service settings: which gateway services (rpc, data, gas, tx_status, ens, prices, contracts, utils) are enabled and an optional monthly unit cap per service. Use it with no arguments to read; pass enabled and Inputs: enabled, caps, window |
convert_evm | Offline EVM utilities, no chain call: op='checksum' (EIP-55 checksum and validity of input=address), op='convert' (unit conversion wei…gwei…eth: input=value, from=unit, to=unit), op='selector' (4-byte selector and topic0 of input=function s Inputs: op, input, from, to |
create_api_key | Create an additional API key on the account you are calling with (a name, optional monthly unit cap). Use it to give a service or a teammate its own key with its own budget. Not for your first key (use get_key, no signup) and not for a wall Inputs: name, monthly_request_cap |
decode_calldata | Decode a transaction's calldata against the target contract's verified ABI (Sourcify): the function signature, its selector and the argument values (static types decoded; dynamic types shown raw and labelled). Use it to explain what a pendi Inputs: chain, address, data |
explain_error | Explain a FlexYield error code (e.g. -32007): what it means, the steps to take and its doorway (the path past the limit that caused it). Use it whenever a call returned an error with a code you do not know, before retrying or filing a ticke Inputs: code |
get_abi | The verified ABI of a contract (with its name and match level) from Sourcify's open dataset on eth_mainnet, base_mainnet, arbitrum_one, optimism_mainnet or polygon_pos. Use it before calling or decoding a contract you do not have the ABI fo Inputs: chain, address |
get_balances | Native balance and ERC-20 token balances of an address on one chain (eth_mainnet, base_mainnet, arbitrum_one, optimism_mainnet, polygon_pos, solana_mainnet; tokens where a data-capable upstream exists). Use it for a portfolio or a pre-fligh Inputs: chain, address |
get_billing_status | Billing state of your account: tier, whether payments are live, the subscription (plan, interval, price in USD cents, status, period end, cancel-at-period-end), the card on file (brand, last4, expiry — never the number), prepaid pack balanc |
get_history | Recent asset transfers (sent and received, newest first) of an address on one EVM chain with a data-capable upstream. Use it to answer 'what moved in or out of this address lately'. Not for current balances (use get_balances), one transacti Inputs: chain, address |
get_key | Get a FlexYield API key with no signup: public supply, 10,000 weighted units per UTC day, 5 requests/s, every tool. Use it once, when you have no key yet; then send the key as the bearer on every other call. Not for a key you already hold ( |
get_prices | Prices. kind='gas' (chain): EIP-1559 gas recommendations (slow/standard/fast) computed from our pool on an EVM chain, 1 weighted unit. kind='token' (symbols, comma-separated e.g. 'ETH,USDC'): current token prices in USD. Use it before sendi Inputs: kind, chain, symbols |
get_quote | Quote one JSON-RPC call before making it: the weighted units it costs (standard 1, heavy 2, or not offered) and the USD per 1M units on every lane (a lane = a price tier: cheap, balanced, fast). Use it when an owner asks what a workload wou Inputs: chain, method, tier |
get_statement | Your account's statement for one billing period (default: the current one): invoice facts plus usage grouped by API key or agent, chain and method class — requests, weighted units, cache hits, refusals; period='list' enumerates the periods Inputs: period |
get_tx_status | Status of one transaction hash on any supported chain: confirmed, failed, pending or unknown, with confirmations and gas on EVM chains or slot and commitment on Solana. Use it to poll a transaction you sent or were told about. Not for an ad Inputs: chain, hash |
get_usage | Your account's usage in one of three views. view='report': requests, weighted units, errors and latency per key, method and chain over a look-back window (hours, default 24; optional chain). view='stats': one console report — report='latenc Inputs: view, chain, hours, report, window |
join_enterprise_wishlist | Send FlexYield an enterprise wishlist: what would need to be true for you to run on FlexYield (chains, SLAs, compliance, features, prices; max 1000 chars) plus a contact email; the founders reply by email. Use it when the public plans do no Inputs: email, items |
join_waitlist | Join the FlexYield early-access waitlist with an email and a qualifier (developer, investor or curious). Use it only when a human asked to be kept informed; an agent that needs access now should call get_key instead. Not for support (use ma Inputs: email_address, qualifier, source, product_updates |
list_api_keys | List the API keys of your account (scope='keys', default) or its agent fleet with wallet claims and budgets (scope='agents'). Use it to find a key id before configure_key or revoke_api_key, or to see which keys are in use. Not for usage num Inputs: scope |
list_plans | List FlexYield's public plans: price in integer USD cents, billing interval, monthly included units and burst rate limits, plus the enterprise line and the signup URL. Use it to compare plans or before telling an owner what an upgrade costs |
manage_feedback | Product feedback to FlexYield. action='submit' (kind: 'feature' | 'chain' | 'praise' | 'complaint' | 'other', title, optional body, optional chain) files it and we answer on the feedback page; action='list' (optional status) shows what you Inputs: action, kind, title, body, chain, status |
manage_tickets | Your support tickets with FlexYield. action='create' (subject, message, optional request_id of the failing call, optional category) opens a ticket with the call's evidence attached; action='list' (optional status); action='get' (reference); Inputs: action, subject, message, request_id, category, status |
migrate | A compatibility report for switching your RPC provider to FlexYield: paste your current config as text (endpoint URLs, env lines, code) and get every endpoint mapped to our chain URL, every JSON-RPC method you name with its unit weight and Inputs: config |
recommend | A recommendation from our live measurements. what='chain': which chain fits a task (optional family, candidates, prefer), ranked from our probes and method rules. what='route': which lane (price tier: cheap, balanced, fast) to use for one c Inputs: what, family, candidates, prefer, chain, method |
resolve_ens | ENS resolution on Ethereum mainnet: pass a name ('vitalik.eth') to get its address, or an address (0x…) to get its reverse-record name, read on-chain through our pool. Use it whenever a user gives you a .eth name instead of an address. Not Inputs: query |
revoke_api_key | Revoke one API key of your account by id; calls with that key stop working immediately and the key cannot be restored. Use it when a key leaked or a service is retired; ids come from list_api_keys. Not for pausing a key (set its budget to a Inputs: api_key_id |
rpc_call | Send one JSON-RPC call through the FlexYield gateway — the same routing, failover, cache and meter as POST /rpc/{chain}. chain: 'eth_mainnet' | 'base_mainnet' | 'arbitrum_one' | 'optimism_mainnet' | 'polygon_pos' | 'solana_mainnet'; method Inputs: chain, method, params |
update_account | Update your account's preferences: notifications (notify_incidents, time_zone) and/or the insights that tailor the service (use_case, team_size, volume, region, previous_provider, referral_source, chains, wish_chains, wish_chain_other). Use Inputs: notify_incidents, time_zone, use_case, team_size, volume, region |
verify_signature | Verify a signature offline: mode='personal' checks an EIP-191 personal_sign signature (message, 65-byte 0x signature, optional expected address); mode='siwe' checks a SIWE / EIP-4361 message (the exact signed text plus signature — parses th Inputs: mode, message, signature, address |
what_can_i_do | The status overview of the API key you are calling with: its door (how it was obtained: public via get_key, wallet-bound, or adopted by a paying owner), its tier, the budgets left (month, day, prepaid packs), the fences (its limits) each wi |
Every block below points at https://flexyield.io/mcp. Pick your client and copy.
claude mcp add --transport http flexyield-blockchain-rpc-gateway https://flexyield.io/mcp
{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://flexyield.io/mcp"]
}
}
}{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"url": "https://flexyield.io/mcp"
}
}
}{
"servers": {
"flexyield-blockchain-rpc-gateway": {
"type": "http",
"url": "https://flexyield.io/mcp"
}
}
}{
"context_servers": {
"flexyield-blockchain-rpc-gateway": {
"url": "https://flexyield.io/mcp"
}
}
}{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"serverUrl": "https://flexyield.io/mcp"
}
}
}{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"url": "https://flexyield.io/mcp"
}
}
}name: FlexYield — blockchain RPC gateway
version: 0.0.1
schema: v1
mcpServers:
- name: FlexYield — blockchain RPC gateway
type: streamable-http
url: https://flexyield.io/mcp{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"httpUrl": "https://flexyield.io/mcp"
}
}
}{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"type": "http",
"url": "https://flexyield.io/mcp"
}
}
}{
"mcpServers": {
"flexyield-blockchain-rpc-gateway": {
"url": "https://flexyield.io/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fflexyield.io%2Fmcp&type=streamable_http&id=flexyield-blockchain-rpc-gateway&name=FlexYield%20%E2%80%94%20blockchain%20RPC%20gateway
It answered our last check on 19 October 2026 in 49 ms. Over 6 checks since 10 September 2026 it answered 4. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by flexyield.io and served from flexyield.io, the vendor's own domain: https://flexyield.io/mcp.
35, as returned by the server's own tools/list on 15 September 2026: bind_key_complete, bind_key_start, buy_pack, claim_agent_complete, claim_agent_start, configure_key, configure_services, convert_evm, and 27 more.
It answered our last check on 19 October 2026 in 49 ms. Over 6 checks since 10 September 2026 it answered 4.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://flexyield.io/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: io.flexyield. Endpoint host: flexyield.io. ARD identifier: urn:air:io.flexyield:mcp:gateway.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.