AINumbers.co A2A API
The A2A API from AINumbers.co — 5 operation(s) for a2a.
Work with this as data
Every API here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for apis
7 MCP tools reach this
find_apisBrowse and filter every API in the catalog.get_api_artifactsOne API's artifacts, grouped by type.get_openapiThe primary OpenAPI for this API.find_similar_apisAPIs that look like this one.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This API
curl "https://apis.io/api/v1/apis/ainumbers-co:ainumbers-co-a2a-api"
All apis
curl "https://apis.io/api/v1/apis?limit=25"Discovery needs no key. Ratings and market analysis are Pro.
Get an API key
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.
OpenAPI Specification
openapi: 3.2.0
info:
title: AINumbers.co Fintech Intelligence Suite A2A API
version: 1.0.0
description: '**1255 fintech intelligence tools** covering ISO 20022, A2A payments, CFPB §1033, EU AI Act, DORA, MiCA, AML/KYC, BaaS, DLT/tokenization, ESG/climate finance, agentic payments (AP2, ACP, x402, Visa TAP, Mastercard Agent Pay), PQC migration, sanctions screening, and OpenChainGraph v0.4 computation chains.
## Transport
> **The live transport is MCP JSON-RPC 2.0 at `https://mcp.ainumbers.co/mcp` — not REST.**
>
> This OpenAPI file is a **descriptive data-room artifact** — a machine-readable index of all tools and their input/output schemas. The REST paths (`POST /v1/tools/{name}`) described here are a projection; they become functional only if the optional REST shim (Area 2 Path B) is deployed.
>
> To call tools today, connect via the official MCP client SDKs. TypeScript: `@modelcontextprotocol/sdk`. Python: `mcp`.
## Architecture
All tools run **entirely client-side** (browser JavaScript). Zero PII. Zero server calls after page load. Deterministic, reproducible outputs. Licensed CC BY 4.0.
OpenChainGraph v0.4 compute-binding nodes additionally run **server-side on the MCP Worker** and emit verifiable artifacts with `execution_hash` (WebCrypto SHA-256 over RFC 8785 canonical JSON).'
contact:
name: Post Oak Labs
url: https://postoaklabs.com
email: tim@postoaklabs.com
license:
name: CC BY 4.0
url: https://creativecommons.org/licenses/by/4.0/
servers:
- url: https://ainumbers.co
description: Static browser-based tool host (DreamHost). Tools run client-side — no REST gateway is active on this origin. See x-mcp for the live MCP endpoint.
tags:
- name: a2a
paths:
/v1/tools/calculate_a2a_fee_route:
post:
operationId: calculate_a2a_fee_route
summary: A2A Fee Calculator + Route Optimizer
description: 'Calculates per-transaction and annual costs for A2A rails (FedNow, RTP, Same-Day ACH, Next-Day ACH) versus card, and runs a multi-factor route optimizer across speed, cost, finality, and use-case fit. Exports a route recommendation mandate.
**Tool URL:** https://ainumbers.co/tools/01-a2a-fee-route-optimizer.html
**AP2/Policy Mandate export:** yes'
tags:
- a2a
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- volume
- avgTxn
- cardRate
properties:
volume:
type: number
avgTxn:
type: number
cardRate:
type: number
urgency:
type: string
responses:
'200':
description: Successful tool execution result
content:
application/json:
schema:
type: object
properties:
best_rail:
type: string
best_cost_monthly:
type: number
best_savings_yr:
type: number
savings_pct:
type: number
route_rail:
type: string
route_confidence:
type: string
x-mcp-tool-name: calculate_a2a_fee_route
x-tool-url: https://ainumbers.co/tools/01-a2a-fee-route-optimizer.html
x-source: manifest
x-ap2-export: true
/v1/tools/validate_a2a_agent_card:
post:
operationId: validate_a2a_agent_card
summary: A2A Agent Card Validator & Extension Checker
description: 'Validates an Agent2Agent (A2A) agent-card.json against the v1.0 shape, checks the signed-card signatures block, and confirms AP2 / x402 extension declarations. Field names reflect A2A v1.0 — verify against the A2A schema. Does not perform cryptographic signature verification.
**Tool URL:** https://ainumbers.co/tools/283-a2a-agent-card-validator.html
**AP2/Policy Mandate export:** yes'
tags:
- a2a
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
agent_card:
type: object
description: The A2A agent-card.json document
required:
- agent_card
responses:
'200':
description: Successful tool execution result
content:
application/json:
schema:
type: object
properties:
score:
type: number
findings:
type: array
x-mcp-tool-name: validate_a2a_agent_card
x-tool-url: https://ainumbers.co/tools/283-a2a-agent-card-validator.html
x-source: manifest
x-ap2-export: true
/v1/tools/optimize_a2a_rail:
post:
operationId: optimize_a2a_rail
summary: A2A Rail Optimization Command Center
description: 'Five-stage A2A rail evaluation: rail recommendation → fee modelling → liquidity impact → compliance mapping → NPV/IRR business case. Produces an Nygard ADR implementation memo and AP2 rail mandate.
**Tool URL:** https://ainumbers.co/tools/82-a2a-rail-command-center.html
**AP2/Policy Mandate export:** yes'
tags:
- a2a
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- annualVolume
- currentRail
properties:
annualVolume:
type: number
currentRail:
type: string
primaryDriver:
type: string
responses:
'200':
description: Successful tool execution result
content:
application/json:
schema:
type: object
properties:
recommended_rail:
type: string
selected_rail:
type: string
annual_saving:
type: number
net_liquidity_benefit:
type: number
npv:
type: number
irr:
type: number
payback_months:
type: number
x-mcp-tool-name: optimize_a2a_rail
x-tool-url: https://ainumbers.co/tools/82-a2a-rail-command-center.html
x-source: manifest
x-ap2-export: true
/v1/tools/plan_a2a_migration:
post:
operationId: plan_a2a_migration
summary: A2A Real-Time Migration Lab
description: 'End-to-end A2A rail migration workbench: rail fit scoring → prefunding liquidity modelling → compliance configuration → synthetic test data generation → reconciliation configuration. Outputs an implementation playbook and AP2 migration mandate.
**Tool URL:** https://ainumbers.co/tools/84-a2a-migration-lab.html
**AP2/Policy Mandate export:** yes'
tags:
- a2a
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- rail
- annualVol
- avgTxn
properties:
rail:
type: string
annualVol:
type: number
avgTxn:
type: number
driver:
type: string
responses:
'200':
description: Successful tool execution result
content:
application/json:
schema:
type: object
properties:
rail_fit_score:
type: number
playbook:
type: string
x-mcp-tool-name: plan_a2a_migration
x-tool-url: https://ainumbers.co/tools/84-a2a-migration-lab.html
x-source: manifest
x-ap2-export: true
/v1/tools/validate_a2a_trust_chain:
post:
operationId: validate_a2a_trust_chain
summary: A2A Agent-Card Trust-Chain Validator
description: 'The horizontal agent-to-agent trust complement. Validates an A2A v1.0 agent card (schema, signature, extension URIs) then assesses the delegated-authority trust chain into KYA-OS attestation + spend policy: chain depth <= 4, no scope escalation, validity windows <= 90 days. Trust PASS/WARN/FAIL determination + execution_hash.
**Tool URL:** https://ainumbers.co/chaingraph/art-32-a2a-agent-card-trust-chain-validator.html
**AP2/Policy Mandate export:** yes'
tags:
- a2a
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- agent_card
- delegation_chain
- spend_policy
properties:
agent_card:
description: type not evidenced by kernel source
delegation_chain:
type: array
spend_policy:
description: type not evidenced by kernel source
responses:
'200':
description: Successful tool execution result
content:
application/json:
schema:
type: object
properties:
card_schema_ok:
type: boolean
checks:
type: array
items:
type: object
properties:
code:
type: string
note:
type: string
status:
type: string
fail_count:
type: integer
no_expired_links:
type: boolean
no_scope_escalation:
type: boolean
pass_count:
type: integer
signature_block_present:
type: boolean
trust_determination:
type: string
warn_count:
type: integer
x-mcp-tool-name: validate_a2a_trust_chain
x-tool-url: https://ainumbers.co/chaingraph/art-32-a2a-agent-card-trust-chain-validator.html
x-source: manifest
x-ap2-export: true
x-mcp:
transport: MCP JSON-RPC 2.0 (streamable HTTP)
endpoint: https://mcp.ainumbers.co/mcp
protocol_version: '2025-11-25'
authentication: none
registry: co.ainumbers/tools (official MCP registry)
note: Connect any MCP-compatible client (Claude, ChatGPT, custom agent) directly to this endpoint. The REST paths in this file are descriptive only — they do not exist on the live server unless the REST shim is deployed.