Fatstack
Paid MCP tools behind one endpoint. Agents pay per call in USDC on Base via x402.
Connect it
Settings → Connectors → Add custom connector
URL: https://www.fatstack.net/api/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://www.fatstack.net/api/mcp{
"mcpServers": {
"registry": {
"url": "https://www.fatstack.net/api/mcp"
}
}
}claude mcp add --transport http registry https://www.fatstack.net/api/mcp{
"servers": {
"registry": {
"type": "http",
"url": "https://www.fatstack.net/api/mcp"
}
}
}15 tools, verified live
fatstack__free_demo**FREE DEMO — $0.00, no wallet, no payment.** First-party tool served by Fatstack itself, not a marketplace listing. Call it to confirm your MCP client is wired up correctly. Every other tool here is a paid listing: calling one returns HTTP 402 with a price, an asset and the provider’s own wallet as payee, and you pay in USDC on Base with an EIP-3009 authorisation. Fatstack never receives those f
echo__echo_json$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://echo.fatstack.net/mcp and never receives the funds.<untruste
json-schema-validate__json_schema_validate$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://json-schema-validate.fatstack.net/mcp and never receives the
html-to-markdown__html_to_markdown$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://html-to-markdown.fatstack.net/mcp and never receives the fun
url-metadata__url_metadata$0.010000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://url-metadata.fatstack.net/mcp and never receives the funds.<
csv-to-json__csv_to_json$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://csv-to-json.fatstack.net/mcp and never receives the funds.<u
text-language-detect__text_language_detect$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://text-language-detect.fatstack.net/mcp and never receives the
regex-test__regex_test$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://regex-test.fatstack.net/mcp and never receives the funds.<un
unit-convert__unit_convert$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://unit-convert.fatstack.net/mcp and never receives the funds.<
cron-explain__cron_explain$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://cron-explain.fatstack.net/mcp and never receives the funds.<
uuid-batch__uuid_batch$0.000500 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://sdk-tools.fatstack.net/uuid-batch/mcp and never receives the
markdown-lint__markdown_lint$0.001000 USDC per call on eip155:8453, paid directly to the provider (0x69ad5fb5de6dcdbd8a025374ab7bb23996a69fd9). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://markdown-lint.fatstack.net/mcp and never receives the funds.
askzephy-quick-scan__sol_audit$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://audit.askzephy.com/mcp and never receives the funds.<untrust
askzephy-quick-scan__sol_quick_scan$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://audit.askzephy.com/mcp and never receives the funds.<untrust
askzephy-quick-scan__google_news_feed$0.005000 USDC per call on eip155:8453, paid directly to the provider (0xf4729bec220090ef08c786e9142898354178771e). Payments are final. Once settled on-chain the transfer cannot be reversed, and there are no refunds.Calling this tool returns HTTP 402 with payment terms until a payment is presented. Fatstack relays that quote from https://audit.askzephy.com/mcp and never receives the funds.<untrust
Alternatives in Crypto & Web3
Compare →
BitviewB
Read-only Bitcoin blockchain, mempool, mining, market, and on-chain analytics; no API key.
Crypto Trends MCPB
Crypto token and narrative trend volume over time, with growth signals. Free key at trendsmcp.ai
AAAgoragentic Agent OS MCPB
Triptych OS (Agent OS) MCP for governed routing, receipts, and USDC settlement on Base.
BYBykaranteliB
Crypto derivatives data: funding, OI, liquidations, options, ETF flows. Free account key required.
SHShumiB
Crypto market intelligence: prices, funding rates, narratives, regime, and delta-neutral research.
ATAtlasYieldB
DeFi vault judgment for agents: 16-factor Atlas Score, route survival, blowup alerts. Read-only.