fourzerotwo-si Us Spending API
US Federal Spending: US federal contracts, grants and loans from USAspending.gov: search awards by keyword, agency or recipient, read an award, profile a recipient.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Fourzerotwo Si Us Spending API
version: 1.1.0
contact:
url: https://fourzerotwo.si
description: 'Operations tagged us-spending across 2 of this provider''s published API definitions: openapi.json, fourzerotwo-si-openapi.json. Each path carries the servers of the definition it was published in.'
servers:
- url: https://fourzerotwo.si
tags:
- name: us-spending
description: 'US Federal Spending: US federal contracts, grants and loans from USAspending.gov: search awards by keyword, agency or recipient, read an award, profile a recipient.'
paths:
/v1/us-spending/search:
get:
operationId: us_spending__search
summary: 'US Federal Spending: Search awards'
description: 'Federal awards by keyword, recipient, awarding agency and date range, largest first. kind: contracts (default), idvs, grants or loans. Price: $0.003 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- us-spending
externalDocs:
url: https://fourzerotwo.si/apis/us-spending/search
parameters:
- name: q
in: query
required: false
description: Keywords
schema:
type: string
maxLength: 200
example: cybersecurity
- name: recipient
in: query
required: false
description: Recipient name
schema:
type: string
maxLength: 120
- name: agency
in: query
required: false
description: Awarding agency (top tier), e.g. Department of Defense
schema:
type: string
maxLength: 120
- name: kind
in: query
required: false
description: contracts, idvs, grants or loans
schema:
type: string
maxLength: 10
- name: from
in: query
required: false
description: Action date from, YYYY-MM-DD
schema:
type: string
maxLength: 10
example: '2026-01-01'
- name: to
in: query
required: false
description: Action date to, YYYY-MM-DD
schema:
type: string
maxLength: 10
- name: limit
in: query
required: false
description: Max results (default 20, max 50)
schema:
type: integer
- name: page
in: query
required: false
description: Page
schema:
type: integer
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.003000'
x-free-tier: free
x-mcp-tool: us-spending__search
servers:
- url: https://fourzerotwo.si
/v1/us-spending/award:
get:
operationId: us_spending__award
summary: 'US Federal Spending: Award'
description: 'One federal award in full: agency, recipient and parent, obligated/outlayed/potential value, dates, place of performance, NAICS and PSC. Price: $0.002 USDC per call via x402. Free within the daily allowance with a free key.'
tags:
- us-spending
externalDocs:
url: https://fourzerotwo.si/apis/us-spending/award
parameters:
- name: id
in: query
required: true
description: Award id from search (generated_internal_id)
schema:
type: string
maxLength: 120
example: CONT_AWD_FA862118F6251_9700_FA862115D6276_9700
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.002000'
x-free-tier: free
x-mcp-tool: us-spending__award
servers:
- url: https://fourzerotwo.si
/v1/us-spending/recipient:
get:
operationId: us_spending__recipient
summary: 'US Federal Spending: Recipient profile'
description: 'A federal recipient: name, UEI, parent, alternate names, business types, location and total amounts. Give id, or name to use the best match. Price: $0.02 USDC per call via x402. 3 free calls/day with a free key.'
tags:
- us-spending
externalDocs:
url: https://fourzerotwo.si/apis/us-spending/recipient
parameters:
- name: name
in: query
required: false
description: Recipient name
schema:
type: string
maxLength: 120
example: Lockheed Martin
- name: id
in: query
required: false
description: Recipient id (from search)
schema:
type: string
maxLength: 40
responses:
'200':
description: The data (paid, or free tier).
content:
application/json: {}
'402':
$ref: '#/components/responses/PaymentRequired'
'400':
$ref: '#/components/responses/Error'
'404':
$ref: '#/components/responses/Error'
'502':
$ref: '#/components/responses/Error'
security:
- {}
- freeKey: []
x-price-usd: '0.020000'
x-free-tier: sample
x-mcp-tool: us-spending__recipient
servers:
- url: https://fourzerotwo.si
components:
responses:
PaymentRequired:
description: x402 payment required. The body (also base64 in the PAYMENT-REQUIRED header) lists accepted payments.
headers:
PAYMENT-REQUIRED:
schema:
type: string
description: Base64 JSON x402 v2 PaymentRequired
content:
application/json:
schema:
type: object
properties:
x402Version:
type: integer
error:
type: string
accepts:
type: array
items:
type: object
Error:
description: 400 = invalid input, 404 = not found at the source, 502 = the source failed. Never charged.
content:
application/json:
schema:
type: object
properties:
error:
type: string
charged:
type: boolean
securitySchemes:
freeKey:
type: apiKey
in: header
name: X-API-Key
description: Optional free key (fzt_…) for the free tier.
x-refined-from:
- openapi.json
- fourzerotwo-si-openapi.json