P2Flux API

Non-custodial USDC payments API on the Base blockchain. Provides REST endpoints for one-time USDC payment intents with on-chain verification, recurring/subscription payments with merchant-triggered charges, and refunds. Payments are authorized per-request via HMAC-signed capabilities plus the payer's EIP-712 wallet signature — no signup, no dashboard, no issued credentials, and no custody of funds.

P2Flux API publishes 1 API on the APIs.io network: P2Flux API. Tagged areas include Payments, Payment API, Cryptocurrency, Stablecoins, and USDC.

P2Flux API’s developer surface includes documentation, getting-started guide, API reference, pricing, support, sandbox, authentication, and 24 more developer resources.

🌐 Visit website 📡 Source on GitHub
43.5/100 developing Agent 25/100 agent aware Full breakdown ↓
scored 2026-09-15 · rubric v0.22.0
1 APIs 1 MCP Servers
PaymentsPayment APICryptocurrencyStablecoinsUSDCBaseRecurring PaymentsSubscriptionRefundsNon-Custodial

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-09-15 · rubric v0.22.0
Composite quality — 43.5/100 · developing
Contract Quality 6.2 / 19
Developer Ergonomics 10.6 / 15
Access Clarity 4.7 / 15
Operational Transparency 5.1 / 10
Contract Governance 0.4 / 9
Discoverability 5.3 / 8
Regulatory Posture 5.9 / 15
Create-or-Update Ergonomics 0.0 / 10
Agent readiness — 25/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Delegated User Identity 0 / 6
Protected Resource Metadata 0 / 5
Registration Without a Human 0 / 6
Agentic Commerce Well-Known Document 0 / 5
Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.
The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/p2flux-api: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

P2Flux API

Non-custodial USDC payments REST API on Base. Covers one-time payments, verification, subscriptions, merchant-triggered charges, refunds, allowance restore/revoke, and gas spons...

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

P2Flux API MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

P2Flux Api Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

P2Flux Api Rate Limits

13 limits

RATE LIMITS

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

P2Flux Api Authentication

0 schemes

SECURITY

P2Flux Api Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 APIOnboarding
APIOnboarding
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Components
Components
 Conventions
Conventions
 Idempotency
Idempotency
 ErrorCatalog
ErrorCatalog
 Conformance
Conformance
 Lifecycle
Lifecycle
 DataModel
DataModel

Scroll for all 7

Build 4

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Packages
Packages
 SDKs
SDKs
 DeclineCodes
DeclineCodes

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 3

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support
 RateLimits
RateLimits

Commercial 4

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 1

The organization behind the API

Website
Website

Source (apis.yml)

apis.yml Raw ↑ 
name: P2Flux API
description: Non-custodial USDC payments API on the Base blockchain. Provides REST endpoints for one-time USDC payment intents
  with on-chain verification, recurring/subscription payments with merchant-triggered charges, and refunds. Payments are authorized
  per-request via HMAC-signed capabilities plus the payer's EIP-712 wallet signature — no signup, no dashboard, no issued
  credentials, and no custody of funds.
url: https://raw.githubusercontent.com/api-evangelist/p2flux-api/refs/heads/main/apis.yml
image: https://p2flux.com/assets/apple-touch-icon.png
created: '2026-09-15'
modified: '2026-09-15'
specificationVersion: '0.21'
tags:
- Payments
- Payment API
- Cryptocurrency
- Stablecoins
- USDC
- Base
- Recurring Payments
- Subscription
- Refunds
- Non-Custodial
tags_raw:
- Payments
- Payment API
- Cryptocurrency
- Stablecoins
- USDC
- Base
- Recurring Payments
- Subscriptions
- Refunds
- Non-Custodial
apis:
- name: P2Flux API
  description: Non-custodial USDC payments REST API on Base. Covers one-time payments, verification, subscriptions, merchant-triggered
    charges, refunds, allowance restore/revoke, and gas sponsorship. Production runs on Base Mainnet (8453); an identical
    test environment runs on Base Sepolia (84532).
  image: https://p2flux.com/assets/apple-touch-icon.png
  humanURL: https://p2flux.com/docs/api.html
  baseURL: https://api.p2flux.com
  tags:
  - Payments
  - Payment API
  - Cryptocurrency
  - Stablecoins
  - USDC
  - Base
  - Recurring Payments
  - Subscription
  - Refunds
  - Non-Custodial
  tags_raw:
  - Payments
  - Payment API
  - Cryptocurrency
  - Stablecoins
  - USDC
  - Base
  - Recurring Payments
  - Subscriptions
  - Refunds
  - Non-Custodial
  properties:
  - type: OpenAPI
    url: https://p2flux.com/openapi.json
  - type: Documentation
    url: https://p2flux.com/docs/
  - type: LLMsTxt
    url: https://p2flux.com/llms.txt
  - type: OpenAPI
    url: openapi/p2flux-api-openapi.json
  - type: APIReference
    url: https://p2flux.com/docs/api.html
  - type: Authentication
    url: authentication/p2flux-api-authentication.yml
  - type: Conventions
    url: conventions/p2flux-api-conventions.yml
  - type: ErrorCatalog
    url: errors/p2flux-api-problem-types.yml
  - type: DataModel
    url: data-model/p2flux-api-data-model.yml
  - type: Overlay
    url: overlays/p2flux-api-openapi-overlay.yaml
maintainers:
- FN: P2Flux
  url: https://github.com/P2Flux
x-generated:
  by: apis.io/add
  model: claude-opus-4-8
  confidence: 97
  at: '2026-09-15T08:19:35.849Z'
common:
- type: DomainSecurity
  url: security/p2flux-api-domain-security.yml
- type: Website
  url: https://p2flux.com/
- type: DeveloperPortal
  url: https://p2flux.com/docs/
- type: Documentation
  url: https://p2flux.com/docs/
- type: GettingStarted
  url: https://p2flux.com/docs/quickstart.html
- type: APIReference
  url: https://p2flux.com/docs/api.html
- type: Pricing
  url: https://p2flux.com/#pricing
- type: StatusPage
  url: https://p2flux.com/status.html
- type: TermsOfService
  url: https://p2flux.com/terms.html
- type: PrivacyPolicy
  url: https://p2flux.com/privacy.html
- type: Support
  url: https://p2flux.com/integration-enquiries.html
- type: Integrations
  url: https://p2flux.com/integrations.html
- type: GitHubOrganization
  url: https://github.com/P2Flux
- type: LLMsTxt
  url: https://p2flux.com/llms.txt
- type: WellKnown
  url: well-known/p2flux-api-well-known.yml
- type: APIOnboarding
  url: https://p2flux.com/.well-known/api-onboarding
- type: Packages
  url: packages/p2flux-api-packages.yml
- type: SDKs
  url: packages/p2flux-api-packages.yml
- type: Components
  url: components/p2flux-api-components.yml
- type: Sandbox
  url: sandbox/p2flux-api-sandbox.yml
- type: RateLimits
  url: rate-limits/p2flux-api-rate-limits.yml
- type: Plans
  url: plans/p2flux-api-plans-pricing.yml
- type: Conventions
  url: conventions/p2flux-api-conventions.yml
- type: Idempotency
  url: conventions/p2flux-api-conventions.yml
- type: Authentication
  url: authentication/p2flux-api-authentication.yml
- type: ErrorCatalog
  url: errors/p2flux-api-problem-types.yml
- type: DeclineCodes
  url: errors/p2flux-api-decline-codes.yml
- type: Conformance
  url: conformance/p2flux-api-conformance.yml
- type: Lifecycle
  url: lifecycle/p2flux-api-lifecycle.yml
- type: MCPServer
  url: mcp/p2flux-api-mcp.yml
- type: DataModel
  url: data-model/p2flux-api-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-09-15'
  status: enriched
  artifacts_added: 24
  pass: local-v3

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