# AlgoVoi Pay (Payable Core) API

**Canonical:** https://apis.io/apis/algovoi-co-uk/algovoi-pay-payable-core-api/  
**Provider:** AlgoVoi — https://apis.io/providers/algovoi-co-uk/  
**Base URL:** https://pay.algovoi.co.uk  
**Documentation:** https://docs.algovoi.co.uk/algovoi-pay

AlgoVoi Pay (Payable Core) API is one of 6 APIs that [AlgoVoi](https://apis.io/providers/algovoi-co-uk/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include x402, Payments, Verification, agent-native, and A2A. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, a getting-started guide, authentication docs, and rate-limit docs.

Tenant-free, pay-per-call verification rail (OpenAPI 3.1.0 "AlgoVoi Payable Core" 1.0.0, 17 operations). No account and no API key: each paid operation (verify an x402/AP2 receipt JWS, verify an RFC 9421 HTTP message signature, screen a URL; a compliance receipt is "coming soon") answers a strict x402 v2 402 challenge with one accept per lane across twelve mainnet chains, and the resubmitted call with X-PAYMENT returns the result plus an offline-verifiable Ed25519 payable receipt binding request hash, response hash and settled payment. GET on any paid URL is a free 402 probe; GET/POST /pay/v1/negotiate is a free chain-agnostic lane negotiation; /v1/receipt/verify is a free unsigned tier (120/min). The same host serves the A2A JSON-RPC door (/a2a), MPP and AP2 twins, a did:web document, the receipt JWKS and an x402 descriptor.

## Operations (17)

| Method | Path | Summary |
|---|---|---|
| GET | `/pay/v1/index` | Payable Index |
| GET | `/pay/v1/negotiate` | Negotiate Capabilities |
| POST | `/pay/v1/negotiate` | Negotiate |
| GET | `/pay/v1/verify/receipt` | Probe Receipt |
| POST | `/pay/v1/verify/receipt` | Pay Verify Receipt |
| GET | `/pay/v1/verify/rfc9421` | Probe Rfc9421 |
| POST | `/pay/v1/verify/rfc9421` | Pay Verify Rfc9421 |
| GET | `/pay/v1/screen/url` | Probe Url Screen |
| POST | `/pay/v1/screen/url` | Pay Screen Url |
| GET | `/pay/v1/compliance/receipt` | Probe Compliance |
| POST | `/pay/v1/compliance/receipt` | Pay Compliance Receipt |
| POST | `/v1/receipt/verify` | Verify Receipt Post |
| POST | `/a2a` | A2A Jsonrpc |
| POST | `/mpp/verify/receipt` | Mpp Verify Receipt |
| POST | `/mpp/verify/rfc9421` | Mpp Verify Rfc9421 |
| POST | `/ap2/cart` | Ap2 Cart |
| POST | `/ap2/pay` | Ap2 Pay |

## Machine-readable artifacts (19)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/openapi/algovoi-co-uk-pay-openapi.yml
- **OpenAPI** — https://pay.algovoi.co.uk/openapi.json
- **Documentation** — https://docs.algovoi.co.uk/algovoi-pay
- **APIReference** — https://pay.algovoi.co.uk/docs
- **GettingStarted** — https://docs.algovoi.co.uk/chain-agnostic-negotiation
- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/a2a/algovoi-co-uk-a2a.yml
- **AgentCard** — https://pay.algovoi.co.uk/.well-known/agent-card.json
- **LLMsTxt** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/llms/algovoi-co-uk-pay-llms.txt
- **LLMsTxt** — https://pay.algovoi.co.uk/llms.txt
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/authentication/algovoi-co-uk-authentication.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/conventions/algovoi-co-uk-conventions.yml
- **Idempotency** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/conventions/algovoi-co-uk-conventions.yml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/errors/algovoi-co-uk-problem-types.yml
- **RateLimits** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/rate-limits/algovoi-co-uk-rate-limits.yml
- **Plans** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/plans/algovoi-co-uk-plans-pricing.yml
- **Sandbox** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/sandbox/algovoi-co-uk-sandbox.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/overlays/algovoi-co-uk-pay-overlay.yaml
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/skills/algovoi-co-uk-pay-per-call-verification.md
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/apis.yml

## Other AlgoVoi APIs (5)

- [AlgoVoi Gateway API](https://apis.io/apis/algovoi-co-uk/algovoi-gateway-api/)
- [AlgoVoi RFC 9421 Clinic (Verifiable-Comms Agent) API](https://apis.io/apis/algovoi-co-uk/algovoi-rfc9421-clinic-api/)
- [AlgoVoi Agent Trust Bench API](https://apis.io/apis/algovoi-co-uk/algovoi-agent-trust-bench-api/)
- [AlgoVoi Audit Verifier API](https://apis.io/apis/algovoi-co-uk/algovoi-audit-verifier-api/)
- [AlgoVoi MCP Server](https://apis.io/apis/algovoi-co-uk/algovoi-mcp-server/)

## Tags

x402, Payments, Verification, agent-native, A2A

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/algovoi-co-uk/algovoi-pay-payable-core-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/algovoi-co-uk/.