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OpenAPI Specification
openapi: 3.2.0
info:
title: 2s — the (most) everything Tax API
version: '1'
summary: The (most) everything API.
description: 'The (most) everything API for AI agents: 575+ pay-per-call endpoints on one origin.'
contact:
name: 2s
url: https://2s.io
email: alley@2s.io
x-logo:
url: https://2s.io/icon-512.png
altText: 2s
x-guidance: 'Pay-per-call REST API for AI agents — hundreds of endpoints returning ground-truth data (US public records, company & legal identifiers, finance/SEC, crypto/web3, security & CVEs, medical codes, weather & geocoding, agriculture, energy, maritime, music, and more). Every endpoint is paid per call in USDC via x402 (Base or Solana) — no API key, no signup. Call any endpoint with no auth to get a 402 PaymentRequirements envelope, sign it (EIP-3009 on Base, partial SPL transfer on Solana), and retry with the PAYMENT-SIGNATURE header. Add ?trial=1 for one free real call per endpoint per hour to test before paying. To discover the right endpoint: GET https://2s.io/api/directory for the full catalog, or GET https://2s.io/api/search/endpoints?q=<natural-language task> for a ranked match. Per-call price is on each operation as x-payment-info (from $0.001). Batch up to 50 calls behind one payment via POST https://2s.io/api/batch/run.'
servers:
- url: https://2s.io
tags:
- name: Tax
paths:
/api/tax/vat:
get:
tags:
- Tax
summary: Validate a European Union VAT number against the official
description: Validate a European Union VAT number against the official VIES (VAT Information Exchange System) register in real time. Confirms whether the VAT identifier is currently registered for intra-EU trade and, when the member state discloses them, returns the registered business name and address. Covers the 27 EU member states (Greece as EL) plus Northern Ireland (XI); Great Britain (GB) is not in VIES. Pass either a full identifier (vat=DE811569869) or country + number. Returns {valid, countryCode, vatNumber, name, address, requestDate, reason}. When a member-state register is temporarily down, returns a retryable 503 rather than a false negative. Data from the European Commission VIES service.
operationId: tax_vat
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = [VAT check result]; total = 1.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
input:
type: string
valid:
type: boolean
description: True only when VIES confirms the number is currently registered.
countryCode:
type: string
vatNumber:
type: string
name:
type: string
nullable: true
description: Registered legal name, when the member state discloses it.
address:
type: string
nullable: true
description: Registered address (single line), when disclosed.
requestDate:
type: string
nullable: true
description: VIES request timestamp (ISO 8601).
reason:
type: string
nullable: true
description: Why valid is false, when applicable.
required:
- input
- valid
- countryCode
- vatNumber
- name
- address
- requestDate
- reason
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: tax.vat
x-2s-version: null
x-2s-price:
usd: 0.0025
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.002500'
protocols:
- x402: {}
parameters:
- name: vat
in: query
required: false
description: 'Full VAT identifier: 2-letter country prefix + number, e.g. "DE811569869" or "NL810433941B01" (spaces/dots/hyphens allowed).'
schema:
type: string
minLength: 3
maxLength: 20
- name: country
in: query
required: false
description: 2-letter VAT country prefix, e.g. "DE". Greece is EL (GR also accepted); Northern Ireland is XI. Use with number.
schema:
type: string
minLength: 2
maxLength: 2
- name: number
in: query
required: false
description: The VAT number without the country prefix, e.g. "811569869". Use with country.
schema:
type: string
minLength: 2
maxLength: 18
- $ref: '#/components/parameters/TrialMode'
/api/tax/vat-rates:
get:
tags:
- Tax
summary: Current EU VAT rates by member state - standard rate plus
description: 'Current EU VAT rates by member state — standard rate plus reduced/super-reduced/parking/zero rates. Pass `country` (ISO 2-letter; Greece is EL) for one state, or omit it for all 27. Each result returns the standard rate, the list of reduced rates in force, every rate category with its percentage, and the date the rates are in force. Source: European Commission TEDB (Taxes in Europe Database), refreshed regularly. Pairs with tax.vat (which validates a specific VAT number against the live VIES register).'
operationId: tax_vat-rates
deprecated: false
security:
- x402Payment: []
responses:
'200':
description: 'Normalized envelope: items = per-member-state VAT rate summaries; total = number of states returned.'
content:
application/json:
schema:
type: object
required:
- data
- meta
properties:
data:
type: object
properties:
ok:
type: boolean
enum:
- true
items:
type: array
items:
type: object
properties:
memberState:
type: string
description: ISO 2-letter member-state code (Greece = EL).
standardRate:
type: number
nullable: true
description: Standard VAT rate (%).
reducedRates:
type: array
items:
type: number
description: Reduced rates in force (%), ascending.
categories:
type: array
items:
type: object
properties:
category:
type: string
rate:
type: number
required:
- category
- rate
additionalProperties: false
description: Every rate category (STANDARD/REDUCED/…) with its percentage.
situationOn:
type: string
nullable: true
description: Date the rates are in force (YYYY-MM-DD).
required:
- memberState
- standardRate
- reducedRates
- categories
- situationOn
additionalProperties: false
total:
type: integer
nullable: true
description: Total matching rows upstream; null when unknown.
source:
$ref: '#/components/schemas/Source'
required:
- ok
- items
- total
- source
additionalProperties: false
meta:
$ref: '#/components/schemas/CallMeta'
'400':
$ref: '#/components/responses/BadRequest'
'402':
$ref: '#/components/responses/PaymentRequired'
'405':
$ref: '#/components/responses/MethodNotAllowed'
'500':
$ref: '#/components/responses/ServerError'
'502':
$ref: '#/components/responses/UpstreamError'
x-2s-id: tax.vat-rates
x-2s-version: null
x-2s-price:
usd: 0.0025
x-2s-accepts:
- x402
x-2s-response-shape: normalized
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.002500'
protocols:
- x402: {}
parameters:
- name: country
in: query
required: false
description: Country name or ISO country code.
schema:
type: string
pattern: ^[A-Za-z]{2}$
- $ref: '#/components/parameters/TrialMode'
components:
schemas:
Source:
type: object
description: 'Provenance of the data: upstream provider, source URL, and license.'
properties:
provider:
type: string
description: Upstream data provider.
url:
type: string
description: Source URL or documentation link.
license:
type: string
description: License / usage terms for the data.
CallMeta:
type: object
description: Per-call meta envelope — endpoint id, cost, caller kind, settlement details.
X402PaymentRequiredV2:
type: object
description: x402 v2 PaymentRequired envelope. Pick any entry from accepts[], sign for that rail, retry with the PAYMENT-SIGNATURE header.
required:
- x402Version
- accepts
properties:
x402Version:
type: integer
const: 2
error:
type: string
description: Human-readable reason payment is required.
resource:
type: string
description: The resource URL being purchased.
accepts:
type: array
description: Payment requirement options, one per supported network (Base USDC, Solana USDC).
items:
type: object
required:
- scheme
- network
- amount
- asset
- payTo
- maxTimeoutSeconds
properties:
scheme:
type: string
enum:
- exact
network:
type: string
description: CAIP-2 network id, e.g. "eip155:8453" (Base) or "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp".
amount:
type: string
description: Price in atomic asset units (USDC has 6 decimals).
asset:
type: string
description: Asset contract address / mint.
payTo:
type: string
description: Treasury address to pay.
maxTimeoutSeconds:
type: integer
extra:
type: object
description: 'Rail-specific extras (EVM: EIP-712 domain name/version; Solana: feePayer).'
additionalProperties: true
extensions:
type: object
description: Optional discovery metadata (e.g. bazaar input/output schemas).
additionalProperties: true
responses:
PaymentRequired:
description: Payment required. Body contains the x402 PaymentRequirements envelope with a multi-network accepts array; the per-call price is in accepts[].amount (and on the operation as x-2s-price). Sign for whichever rail you hold USDC on (EIP-3009 for Base, partial SPL transfer for Solana) and retry with the PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients).
content:
application/json:
schema:
$ref: '#/components/schemas/X402PaymentRequiredV2'
UpstreamError:
description: Upstream provider error.
MethodNotAllowed:
description: Method not allowed — see `Allow` header for the supported method.
ServerError:
description: Internal server error.
BadRequest:
description: Bad request — invalid parameters.
parameters:
TrialMode:
name: trial
in: query
required: false
description: 'Try before you buy. Set to 1 for one free real call per endpoint per hour — no wallet or payment needed — to verify the endpoint before paying. Equivalent to sending the "X-2s-Trial: 1" request header. Works on every endpoint.'
schema:
type: integer
enum:
- 1
securitySchemes:
x402Payment:
type: apiKey
in: header
name: PAYMENT-SIGNATURE
description: 'x402 protocol v2: base64-encoded PaymentPayload. Call any paid endpoint without auth to receive a 402 with a multi-network PaymentRequirements envelope. Sign for either rail: EIP-3009 transferWithAuthorization (Base USDC) OR a partial SPL token transfer (Solana USDC). Retry with PAYMENT-SIGNATURE header. X-PAYMENT is also accepted for v1 buyer clients. See https://x402.org.'