aid: sponge
name: Sponge
description: Sponge builds financial infrastructure for the agent economy — wallets that let AI agents
  hold and spend money, and a gateway that lets businesses sell services directly to agents. The Sponge
  Wallet API gives an agent its own multi-chain crypto wallet with balances, transfers, swaps, cross-chain
  bridges, payment links, cards (including a Rain-issued Visa Sponge Card), fiat onramps (Coinbase, Stripe),
  and trading on Hyperliquid and Polymarket, plus paid access to external services via the x402 and MPP
  agent-payment protocols. A TypeScript and Python SDK, a spongewallet CLI, and hosted MCP servers ship
  first-party. Backed by Y Combinator (W2026).
url: https://raw.githubusercontent.com/api-evangelist/sponge/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
specificationVersion: '0.23'
x-backed-by:
- y-combinator
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://paysponge.com/logo.png
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
tags:
- Company
- Agentic Payments
- AI Agents
- Wallets
- Cryptocurrency
- Payments
- Stablecoins
- x402
- MPP
- Financial Infrastructure
- MCP
- Fintech
- Cards
- On-Ramp
tags_raw:
- Company
- Agent Payments
- AI Agents
- Wallets
- Cryptocurrency
- Payments
- Stablecoins
- x402
- MPP
- Financial Infrastructure
- MCP
- Fintech
- Cards
- Onramp
created: '2026-07-17'
modified: '2026-09-16'
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
apis:
- aid: sponge:sponge-agents-api
  name: Sponge Agents API
  description: The Agents API from Sponge — 5 operation(s) for agents.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/sponge-agents-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-cards-api
  name: Sponge Cards API
  description: The Cards API from Sponge — 6 operation(s) for cards.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Cards
  properties:
  - type: OpenAPI
    url: openapi/sponge-cards-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-fiat-api
  name: Sponge Fiat API
  description: The Fiat API from Sponge — 11 operation(s) for fiat.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Fiat
  properties:
  - type: OpenAPI
    url: openapi/sponge-fiat-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-mpp-api
  name: Sponge MPP API
  description: The MPP API from Sponge — 5 operation(s) for mpp.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - MPP
  properties:
  - type: OpenAPI
    url: openapi/sponge-mpp-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-payments-api
  name: Sponge Payments API
  description: The Payments API from Sponge — 1 operation(s) for payments.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/sponge-payments-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-secrets-api
  name: Sponge Secrets API
  description: The Secrets API from Sponge — 2 operation(s) for secrets.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Secrets
  properties:
  - type: OpenAPI
    url: openapi/sponge-secrets-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-sponge-card-api
  name: Sponge Card API
  description: The Sponge Card API from Sponge — 7 operation(s) for sponge card.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Sponge Card
  properties:
  - type: OpenAPI
    url: openapi/sponge-sponge-card-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-trading-api
  name: Sponge Trading API
  description: The Trading API from Sponge — 1 operation(s) for trading.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Trading
  properties:
  - type: OpenAPI
    url: openapi/sponge-trading-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-transfers-api
  name: Sponge Transfers API
  description: The Transfers API from Sponge — 9 operation(s) for transfers.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Transfers
  properties:
  - type: OpenAPI
    url: openapi/sponge-transfers-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
- aid: sponge:sponge-wallet-api
  name: Sponge Wallet API
  description: The Wallet API from Sponge — 4 operation(s) for wallet.
  humanURL: https://docs.paysponge.com
  baseURL: https://api.wallet.paysponge.com
  tags:
  - Wallets
  tags_raw:
  - Wallet
  properties:
  - type: OpenAPI
    url: openapi/sponge-wallet-api-openapi.yml
  - type: APIReference
    url: https://docs.paysponge.com/api-reference/public-openapi.json
common:
- type: CapabilityMap
  url: capabilities/sponge-capability-edges.yml
  name: Sponge Business Capability Map
- type: Overlay
  url: overlays/sponge-openapi-overlay.yaml
- type: Website
  url: https://paysponge.com
- type: DeveloperPortal
  url: https://docs.paysponge.com
- type: Documentation
  url: https://docs.paysponge.com
- type: GettingStarted
  url: https://docs.paysponge.com/wallet/sdk.md
- type: Support
  url: https://discord.gg/gwH2QqMDaX
- type: GitHubOrganization
  url: https://github.com/paysponge
- type: SignUp
  url: https://wallet.paysponge.com
- type: TermsOfService
  url: https://paysponge.com/terms
- type: PrivacyPolicy
  url: https://paysponge.com/privacy
- type: Authentication
  url: authentication/sponge-authentication.yml
- type: OAuthScopes
  url: scopes/sponge-scopes.yml
- type: DomainSecurity
  url: security/sponge-domain-security.yml
- type: AgenticAccess
  url: agentic-access/sponge-agentic-access.yml
- type: MCPServer
  url: mcp/sponge-mcp.yml
- type: LLMsTxt
  url: llms/sponge-llms.txt
- type: Packages
  url: packages/sponge-packages.yml
- type: SDKs
  url: packages/sponge-packages.yml
- type: CLI
  url: cli/sponge-cli.yml
- type: WellKnown
  url: well-known/sponge-well-known.yml
- type: Conventions
  url: conventions/sponge-conventions.yml
- type: Conformance
  url: conformance/sponge-conformance.yml
- type: DataModel
  url: data-model/sponge-data-model.yml
- type: Lifecycle
  url: lifecycle/sponge-lifecycle.yml
- type: Sandbox
  url: sandbox/sponge-sandbox.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Arazzo
  name: Check balance, transfer, and confirm
  url: arazzo/sponge-transfer-and-confirm.yml
- type: Arazzo
  name: Create an agent and issue its key
  url: arazzo/sponge-agent-onboarding.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 21
  pass: local-v1