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FintechToolkit

The AI- and developer-first directory of fintech infrastructure tools. Curated APIs, data sources, and open-source projects for builders shipping payments, banking, and beyond.

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  • Payments & Billing
  • Open Banking
  • Identity & KYC
  • Market Data

© 2026 FintechToolkit. The toolkit for fintech builders.

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RFC 8288 / RFC 9727 / SEP-1649Agent-Ready

API & AI Agent Discovery Documentation

FintechToolkit is built from the ground up for both human developers and autonomous AI agents. All directory endpoints, protocols, and discovery manifests are available with zero friction.

Agent Discovery & Protocols

API Catalog (RFC 9727)

linkset+json

Standardized linkset advertising OpenAPI specifications and documentation.

/.well-known/api-catalog

ARD Capability Manifest

json

Agentic Resource Discovery (ARD) manifest with semantic query embeddings.

/.well-known/ai-catalog.json

MCP Server Card (SEP-1649)

json

Model Context Protocol server declaration and tool capabilities.

/.well-known/mcp/server-card.json

Agent Skills Index (RFC v0.2.0)

json

Cryptographically verified agent skills with SHA-256 digests.

/.well-known/agent-skills/index.json

Auth.md Agent Registration

markdown

Agent authentication, registration endpoints, and assertion protocols.

/auth.md

Protected Resource Metadata (RFC 9728)

json

Resource identification and authorization server discovery.

/.well-known/oauth-protected-resource

OAuth 2.0 / OIDC Server

json

RFC 8414 Authorization server endpoints with agent_auth configuration.

/.well-known/oauth-authorization-server

x402 Payment Protocol

json

Agent-native HTTP 402 payment requirements and facilitator endpoints.

/.well-known/x402

OpenAPI 3.1 Specification

json

Full REST API schema including Machine Payment Protocol (MPP) extensions.

/openapi.json

Universal Commerce Protocol (UCP)

json

UCP merchant profile and shopping capability schemas.

/.well-known/ucp

Agentic Commerce Protocol (ACP)

json

ACP autonomous commerce and checkout discovery document.

/.well-known/acp.json

LLMs.txt Directory Summary

plain

Concise site index and architectural guides for language models.

/llms.txt

Model Context Protocol (MCP)

Streamable HTTP MCP Server

Autonomous agents can connect directly to our MCP endpoint using standard JSON-RPC 2.0.

# Transport Endpoint

POST https://fintechtoolkit.com/api/mcp

# Example JSON-RPC Request

{
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "name": "search_tools",
    "arguments": { "query": "payments" }
  },
  "id": 1
}

Supported tools: search_tools, get_tool, list_categories, compare_tools.

Content Negotiation (Markdown for Agents)

Accept: text/markdown

Any HTML page on FintechToolkit can be fetched directly as structured Markdown by passing the Accept: text/markdown header. Responses include the estimated token count in the x-markdown-tokens header.

curl -H "Accept: text/markdown" https://fintechtoolkit.com/tools/stripe

Public Search & Catalog REST API

GET/api/search

Search fintech infrastructure tools by keyword and optional category filter.

GET https://fintechtoolkit.com/api/search?q=open+banking
GET/api/tools

List directory tools with pagination, category, and pricing filters.

GET https://fintechtoolkit.com/api/tools?category=payments&pricing=usage-based
GET/api/health

Service uptime and health status.

GET https://fintechtoolkit.com/api/health